R 5 0160 0250 0400 0505 0630 B MR (872.004.01).qxp

MAINTENANCE

AND

REPAIR MANUAL

R 5 Series

Models 0160, 0250, 0400, 0502, 0630 B Series

Single Stage Rotary Vane Vacuum Pumps

Page

GENERAL 2

Identification 2

1.0 INSTALLATION 2

1.1 Oil Filling 2

2.0 OPERATION 2

2.1 Start-up 2

2.2 Oil Level Float Valve (newer models) 3

2.3 Gas Ballast 3

2.4 Water-Cooled Pumps (optional) 3

2.5 Oxygen Service Pumps 3

3.0 ROUTINE MAINTENANCE 4

3.1 Pump Oil 4

3.1.1 Oil Level 4

3.1.2 Oil Type and Quantity 4

3.1.3 Oil and Filter Change 4

3.1.4 Oil Flushing Procedure 5

3.2 Automotive-Type Oil Filter 5

3.3 Exhaust Filter 6

3.4 Vacuum Inlet Filter 6

3.5 Routine Maintenance Schedule 6

3.6 Overhaul Kit/Filter 7

4.0 DISASSEMBLY 7

4.1 Necessary Tools 7

4.2 Complete Disassembly 7

4.3 Disassembly of Pump Module 8

We reserve the right to change the product at any time without any form of notification. The information in this pub-

lication is accurate to the best of our ability at the time of printing. Busch, Inc. will not be responsible for errors

encountered when attempting to perform tasks outlined in this publication which is copyright protected.

TABLE OF CONTENTS

Page

5.0 CLEANING PROCEDURE 9

6.0 PREPARATION FOR ASSEMBLY 9

6.1 Endplate Preparation 9

6.2 Exhaust Box Preparation 9

7.0 ASSEMBLY 9

7.1 Exhaust Valves 9

7.2 Bearings, Bearing Sleeves, Shaft Seals 10

7.3 Pump Module for Regular Overhaul 11

7.4 Pump Assembly 14

8.0

CHANGING FROM RA TO RC MODEL

8.1 Differences Between RA and RC Pumps 15

9.0 OIL LEVEL SWITCH INSTALLATION

10.0 TROUBLESHOOTING 16

11.0 LIMITED STANDARD WARRANTY 20

Technical Data and Clearances Chart 21

Illustration of R 5 0160 Vacuum Pump 22

Parts List for R 5 0160 23

Illustration of R 5 0400 Vacuum Pump 24

Parts List for R 5 0400 25

Illustration of R 5 0502/0630 Vacuum Pump 26

Parts List for R 5 0502/0630 27

Busch Factory Service Centers 29

GENERAL

Identification

For model identification, see the nameplate mounted on

the side of the exhaust box.

This manual is written to cover RA and RC versions of

models 0160, 0250, 0400, 0502 and 0630 with a "B"

appearing as the seventh character in the model type

number stamped into the nameplate. For example, it

would appear as follows:

RAXXXX-B

XXX-XXXX

When ordering parts, it is helpful to include the identifi-

cation code stamped into the side of the cylinder as well

as the serial number from the nameplate.

All reference (Ref. XXX) numbers listed in the text and

on illustrations throughout this manual are related to the

drawings and parts list shown later in this publication.

This manual is designed to help optimize pump per-

formance and reduce downtime through proper mainte-

nance. Instructions are given for complete disassembly

and assembly.

A separate Installation and Operation manual is provid-

ed with each new pump from the factory. Refer to it for

general operation and installation guidelines. Please

contact the factory if an additional copy is needed.

1.0 INSTALLATION

1.1 Oil Filling

The pump is shipped without oil. After level installation,

and after correct rotation has been established, fill the

pump with the recommended vacuum oil through the oil

filling port (Ref. 88), observing the "MAX" and "MIN"

position at the oil sight glass (Ref. 83). On pumps with

two sight glasses, fill the top glass up to the 3/4 mark.

Non-detergent oil should be used. Do not use

detergent motor oil as additives in detergent oil will

plug exhaust filter elements and shorten their life.

It is recommended that Busch R500 Series oil be used

to receive the best performance from your vacuum

equipment. R500 Series oil is a high quality vacuum oil

that will give longer running time between oil changes,

will provide better lubrication at high operating temper-

atures, and will prolong the life of exhaust filter ele-

ments. This oil can be obtained directly from Busch,

Inc. in Virginia Beach, Virginia.

The strict use of Busch oils and parts from the day of

purchase can extend the Limited Standard Warranty to

three years. Contact Busch, Inc. in Virginia Beach,

Virginia for details.

For general applications, use R530 in all models cov-

ered by this manual. Use R590 or R570 in pumps that

are operated in high ambient temperatures (above

90°F) or high operating pressure when the oil car-

bonizes (turns black) before the change interval.

Contact the factory for recommendations when using

other oils.

The TECHNICAL DATA chart on page 21 gives the

approximate quantities of oil required for each pump.

The oil capacity chart should only be used as a guide,

since oil capacity may be slightly lower, depending on

whether the pump was filled previously, and whether all

components such as oil filter, oil lines, etc., were

allowed to completely drain. Use only the sight glass

reading for proper level. Never overfill!

Replace the oil fill plug (Ref. 88), making sure that the

gasket (Ref. 89) is in place and properly seated and

secured. Some pumps are equipped with an exhaust

pressure gauge as an integral part of the oil fill plug.

2.0 OPERATION

2.1 Start-up

Check rotation of the motor to insure it is rotating in the

correct direction.

Fill the pump with oil as described in Section 1.1 - Oil

Filling.

Start the pump and immediately close the inlet. Run the

pump for a few minutes before checking the oil level

again. With the pump shut off, the oil level should be

visible in the oil sight glass (Ref. 83), between the "MIN"

and "MAX" mark.

On pumps with two sight glasses, with the pump shut

off, the oil level should be visible in the upper oil sight

glass, between the "MIN" and "MAX" mark.

Add oil, if necessary, but only add it when the pump has

been shut off and the circulating oil has had sufficient

time to return to the oil sump.

WARNING: Do not use hydrocarbon oils in

pumps on oxygen service. See Section 2.5

- Oxygen Service Pumps.

WARNING: Keep the oil fill plug tight as

pressure in the exhaust box could cause

bodily injury if the plug is blown out. Do not

fill/add the pump with oil through the

exhaust/inlet ports as there is danger of

breaking the vanes!

On R 5 (Standard) RC model pumps, the collected oil is

drawn continuously during operation of the vacuum

pump to the inlet flange (Ref. 260) via the oil return line

(Ref. 290). The oil return line is connected directly to

the area of the exhaust box, downstream of the exhaust

filter, which is at atmospheric pressure. RC model

pumps can run continuously without having to shut

them off for the oil to drain back.

2.2 Oil Level Float Valve (newer models)

Older models of the RA 0160, 0250, 0400 and 0630 had

to be shut off every 8 hours of operation to allow oil to

drain back to the oil sump via an oil check valve. Newer

model RA 0400, RA 0502 and 0630 pumps have a float

valve mechanism (Ref. 585) added to the outside of the

exhaust box where the two oil return valves are located.

This mechanism contains a float valve housed in a steel

box that is mounted to the exhaust box. An oil return

line runs from the steel box to the inlet of the pump. As

the oil drips off of the exhaust filters and collects in the

float box the float rises opening the valve and allowing

the vacuum (suction) to draw the accumulated oil

through the oil return line back into the inlet of the

pump. As the oil level drops in the float box the valve

closes "blanking off" the oil return line. The idea is that

the oil return line is always full of oil which prevents a

loss of vacuum allowing the pump to achieve ultimate

pressure and run continuously at the same time.

Newer 0400/0502/0630 pumps are configured with the

float valve, but an existing pump in the field can be

modified to have this oil float valve assembly by order-

ing a float valve kit Busch P/N 0946.529.715. Contact

the Service Department of Busch, Inc. in Virginia Beach

is you wish to add this feature to an older pump in the

field or if you are unsure whether you pump has this

feature already.

2.3 Gas Ballast

This series of RA pumps are equipped with an

adjustable gas ballast valve. The gas ballast valve

(Ref. 440) is located between the inlet port and the

exhaust box.

The adjustable gas ballast valve should normally be left

open. Its primary function is to prevent water vapor

from condensing in the pump. Condensation causes

emulsification of the oil, loss of lubricity, and possible

rotor seizure.

2.4 Water-Cooled Pumps (optional)

Water-cooled pumps are cooled by circulating the oil

through a shell-and-tube type heat exchanger (see Fig.

1). The circulation of the cooling water through the

tubes is thermostatically controlled. The flow rate of the

cooling water is controlled by a thermostatically activat-

ed valve.

The thermostatic valve can be manually opened by

inserting a screwdriver under each side of the spring

guide and prying the spring and guide upward away

from the valve body.

Refer to your Installation and Operation manual for

instructions on adjustment and operation of this valve,

or call Busch, Inc. in Virginia Beach, VA. for help.

2.5 Oxygen Service Pumps

These pumps have been manufactured, solvent

washed (to remove organic contaminants) and assem-

bled according to the latest technical standards and

safety regulations. If this pump is not installed properly

or not used as directed, a dangerous situation or dam-

age might occur.

For overhaul/repair of oxygen service pumps,

Busch Inc. strongly recommends that all major repair

operations be conducted at the factory. Improper

handling of repairs could result in extreme

danger to personnel operating the pump.

Note: Pumps returned to Busch, Inc. for repair or serv-

ice must be decontaminated and free of harmful or toxic

material prior to shipment. Certified documentation of

decontamination must be provided prior to the pump's

WARNING: This pump is filled with a special

operating fluid. Do not use any other type

of fluid, oil and/or grease. Use one of the

following:

• Fomblin LC 250

• Tyreno Fluid 12/25V (perfluorinated polyether)

• KRYTOX ® Vacuum pump fluid by Du Pont

Company

If you have any questions, please phone our

Customer Service Department for more information.

Thermostatic

valve

Heat

exchanger

Fig. 1 - Water-cooled Pump

arrival at Busch. Pumps arriving without certification

will, at Busch Inc.'s discretion, be refused shipment or

will be re-routed to a commercial decontamination facil-

ity. All ensuing decontamination costs will be borne by

the shipper.

3.0 ROUTINE MAINTENANCE

R 5 Series pumps require very little routine mainte-

nance; however, to insure optimum pump performance,

the following steps are recommended.

3.1 Pump Oil

3.1.1 Oil Level

With the pump installed relatively level, make sure that

there is sufficient clean oil in the pump. The oil level

should be observed on a daily basis and/or after 8

hours of operation and should be replenished if it drops

below the 1/4 mark on the oil sight glass on pumps with

one sight glass or below the 1/4 mark on the upper oil

sight glass on pumps with two sight glasses.

On RA Series pumps which do not have an oil level float

valve, you must first shut the pump off in order to let the

oil flow back into the oil sump prior to checking the sight

glass. Allow sufficient time for the oil to drain back into

the sump on the pump prior to adding oil, or overfilling

could result.

Oil level readings should be done only when the pump

is turned off. Oil can be added to the oil fill port (Ref.

88) if the pump is shut off and the circulating oil has suf-

ficient time to return to the oil sump. The oil might

appear to be foamy, which is a normal phenomenon

with aerated oil.

Under normal circumstances, it should not be neces-

sary to add or drain oil from the pump between recom-

mended oil changes.

A significant drop in oil level means there is an oil leak

or that an exhaust filter is broken which would cause

the pump to smoke excessively. It is normal for the oil

to be foamy and light in color in an operating pump.

However, if the oil is milky colored, it is an indication

that water is present in the oil. Normally, by operating

the pump for an extended period, with the inlet suction

blanked off and the gas ballast open on RA pumps, the

water will be purged from the oil. If the oil is dark col-

ored, it is contaminated or carbonized and must be

changed. Depending on the severity of the contamina-

tion, a thorough flushing may be needed. See Section

3.1.4 for the flushing procedure.

3.1.2 Oil Type and Quantity

See Section 1.1 - Oil Filling for details on oil type and

quantity.

3.1.3 Oil and Filter Change

Oil life is dependent upon the conditions to which it is

exposed. A clean, dry air stream and an oil operating

temperature under 210°F are ideal conditions. When

using R530 (hydrocarbon oil), it is recommended that

oil changes are made every three (3) to four (4) months

or 500 to 750 hours of operation, or as necessary if high

heat is contaminating the oil. The use of Busch R570

or R590 synthetic oils could extend the operating hours

between oil changes under ideal conditions. Oil sam-

ples should be taken regularly when exceeding the 500-

750 hour recommendation.

Excessive Heat

When the pump is subjected to operating conditions

that will cause the oil to be heated above 235°F, the oil

will carbonize and become contaminated after a rela-

tively low number of operating hours. The higher the

temperature, the quicker the oil becomes contaminated.

If the oil temperature is too severe, Busch R570 or

R590 synthetic oil should be used to withstand the ele-

vated temperatures. If synthetic oil is used, the pump

should be flushed with Busch R568 oil as outlined in

Section 3.1.4. Auxiliary oil cooling is the most practical

approach to a severe heating problem.

Contaminated Air Stream

When the air stream contains a solid and/or liquid that

can contaminate the oil, it must be changed more often.

If the air stream contains a small percentage of con-

taminates and/or they are slightly aggressive (mild

acids, etc.), synthetic oil, such as Busch R570, will

resist breakdown better than the standard Busch R530.

The solution is to install a filter or knock-out pot to keep

the contaminates out of the pump.

Process air streams with a large percentage of contam-

CAUTION: When changing the oil and fil-

ters, it may be necessary to flush the pump

to remove any build-up of degraded oil from

the sumps, oil lines, radiators, etc., to

ensure proper oil flow through the pump.

Reduced oil flow, especially through radia-

tors and cooling coils, can cause mechani-

cal damage or extreme overheating, which

could cause the oil vapors to ignite.

CAUTION: Insufficient oil quantity in the

pump has the potential, under certain con-

ditions, to lead to self-ignition of the

remaining oil in the pump

CAUTION: Do not add oil while the pump is

running since hot oil vapor may escape

through the oil fill port.

inates and/or more than slightly aggressive contami-

nates must use a once-through-sealant or dry-type

pump.

Oil change intervals can only be established by experi-

ence with the pump operating in the actual conditions

(see previous paragraph for some of the conditions).

Develop the oil change interval by periodically checking

an oil sample removed from the pump. When the oil

sample has become dark in color (from solids and car-

bonized particles) or is milky looking (from solids), it is

time to discard it. As mentioned before, a thorough

flushing may be needed.

3.1.4 Oil Flushing Procedure

Flushing is needed under certain conditions. Some

pumps will be beyond flushing and will need to be over-

hauled.

To help determine if flushing is needed, observe the

condition of the oil as it is drained from the pump. Is it

black and tar like or contaminated in any way? Was the

pump noisy, overheating, or was the motor overload

shutting the pump off? How old is the pump and when

was the last time the oil was changed?

If the above conditions exist or you don't know when the

last oil change was performed further investigation is

needed. Flushing is always required if changing from

one oil type, such as R530, to R570 or R590.

All of the oil will be removed and replaced with the

flushing oil (Busch R-568), and eventually that will be

replaced by whatever Busch oil is needed for your par-

ticular application. Have enough oil and oil filters on

hand for a couple of flushes. The following describes

the steps in the flushing procedure:

Shut the pump off and drain all the oil from the pump

and remove the access plates (Ref. 205) from the

exhaust box (Ref. 075). Remove the metal baffle (Ref.

078) and take a good look at the internal walls of the oil

sump. If the walls are discolored but have no build up

of any kind one can proceed with the flushing. If gelled

or burnt oil is clinging to the walls this material must be

scraped and removed prior to flushing. Proceed by

scraping and cleaning as much of the exhaust box as

possible. The more debris that is removed now the

more effective the flushing will be later. Re-install the

metal baffle, cover and proceed with the flushing. At

this point one must remember that the oil lines and oil

cooler might also be plugged to a point where no

amount of flushing will make a difference and a com-

plete overhaul will be the only option. Depending on

the severity of the oil contamination flushing may be a

last ditch effort.

Drain all of the oil from the pump. The more contami-

nated oil you remove now the more effective the oil

flushing will be.

Remove the oil filter (Ref. 100) and install a new one. It

is recommended that you do not change the exhaust fil-

ter or filters until after the flushing to prevent contami-

nation of any new filters.

Fill the exhaust box with the proper amount of flushing

oil (Busch R-568).

If possible run the pump with the inlet closed and off of

the process. Run the pump for approximately six hours,

shut the pump off and drain a small sample of oil into a

clear container.

Examine it. If it is clear to amber run the pump for

another six hours and examine it again. If after the first

six hours it is black drain it and fill again using another

new oil filter.

If after the second flushing the oil still remains black the

pump may have too much contaminated oil in it to flush

out properly. There may be residue remaining in the

lines and cooler that will not flush out. An overhaul will

be necessary.

If after the second six hour period the oil still remains

clear to amber in color drain it, change the oil filter and

fill with the regular oil. At this point also change the

exhaust filters.

Run the pump with a fresh charge of the oil to be used

in your application (not R-568), and monitor the operat-

ing conditions closely. Check for noise, overheating

and oil condition until a regular oil change schedule can

be established.

Do not let the oil turn black. Change it before it fails. If

the oil is kept in good condition the pump will last for

years. If the oil starts to turn black do not hesitate to

flush again. Keeping on top of the oil changes will pre-

vent costly overhauls.

If you are just switching from one type of oil to another

a single six hour flush is all that is necessary (follow the

above instructions). Remember to change to a new

exhaust filter or filters after the flushing and not before.

3.2 Automotive-Type Oil Filter

To replace the automotive-type oil filter (Ref. 100), the

pump should have been running for at least 15 minutes

so that the oil is warm. Then switch off the pump,

remove the oil drain plug (Ref. 95) and drain the oil.

With an automotive-type wrench, remove the oil filter

and replace it with a new one. Coat the face of the gas-

ket (new filter) with oil and hand tighten until the gasket

contacts the base, then tighten two-thirds turn more.

Do not over-tighten. If an O-ring is included, discard it.

It is not used in this application. When replacing the

automotive-type filter, use only a genuine Busch filter.

Note: Make sure to tighten the Busch oil filter secure-

ly against the aluminum sealing surface so that leaks

will not occur.

3.3 Exhaust Filter

Every nine (9) to twelve (12) months, or as necessary,

replace the exhaust filter elements. The service life of

the exhaust filters varies widely with pump application.

It is only necessary to change the filters when the ele-

ments become clogged with foreign material or burned

oil. Indications of clogged filters are smoke and oil mist

coming from the pump exhaust, higher than normal

motor current or oil leaking from the gas ballast valve

on RA models.

A pressure gauge (Ref. 90) is supplied with your R 5

vacuum pump as part of the oil fill plug. This gauge has

a green field and a red field. Pressure within the green

field would indicate normal pressure. Pressure in the

red field (for a continuos period of time) requires an

immediate change of the exhaust filter(s).

In order to replace the filter, remove the screws retain-

ing the exhaust port cover plate. Pull the housing off

the exhaust box; set it aside. Use a slotted head screw

driver to loosen the exhaust filter retaining spring (Ref.

125), then rotate and remove the spring. Pull the filter

cartridge (Ref. 120) out of the exhaust box.

To field test an exhaust filter element, remove it from

the pump, allow it to cool, clean the sealing end (or O-

ring end), and use compressed air to blow through the

element. Apply approximately 3 to 6 psi (maximum

allowable operating pressure across the filter).

Use a shop rag to seal off the connection between the

air hose and the filter. If you can blow through it, the

element is not plugged. If plugged, discard it and install

a new one. The filter cannot be cleaned successfully.

Visually inspect the filter element for cracks.

Reinstall the filter elements. Make sure the open end of

the element is properly seated down in its recess in the

exhaust box with the O-ring (Ref. 121) correctly posi-

tioned. Retain the filter with the spring clip, tighten the

tension screw until the filter is secure. Place the

exhaust port gasket and cover in position on the

exhaust box and retain with the cap screws.

3.4 Vacuum Inlet Filter

If the pump is equipped with a special vacuum inlet fil-

ter in applications where powder, dust or grit is present,

the filter cartridge should be cleaned on a weekly basis,

or as required, depending on the amount of foreign par-

ticles to which the pump is exposed.

To clean the inlet filter, unsnap the lid clamps or remove

the knobs and lift off the filter lid. Remove cartridge,

being careful not to knock any foreign particles present

inside the canister into the pump suction. Clean foreign

particles from the canister with an air hose, and care-

fully back flush the filter cartridge with shop air. If the fil-

ter cartridge has been subjected to moisture or is

extremely dirty, it may need replacement.

3.5 Routine Maintenance Schedule

See the motor manufacturer’s manual for the periodic

motor maintenance.

Daily: Visually check oil level (see 3.1.1).

Weekly: Check oil for contamination (see 3.1.3).

Inspect inlet filter (see 3.4).

Every three (3) or four (4) months, 500 to 750

hours of operation, or as necessary: See 3.1.3

and 1.5. Drain and discard oil from the hot pump.

Replace the automotive-type oil filter and refill with

fresh oil through the fill plug (see 3.1.2 through 3.1.3

and 3.2).

Every nine (9) to twelve (12) months, or as

necessary: Replace exhaust filter elements (see

3.3).

CAUTION: On 0400/0502/0630 models, a

switch mounted on the cover side plate of

the exhaust box is a safety device. This

switch is used to shut off the pump in the

event the pump oil chamber is overheated.

Wire this normally closed switch into a

starter control circuit so that when the

switch reaches the set point, power to the

pump is discontinued.

WARNING: Do not inhale through the filter

or allow your mouth to come in direct con-

tact with the filter.

WARNING: If the gas entering the pump is a

health hazard, use rubber gloves and all

necessary personal protection equipment

when performing the exhaust filter replace-

ment operation. Wear safety glasses as

exhaust filter retainers can, if not secured

correctly, slip off and fly out of the exhaust

box.

CAUTION: Excessively contaminated and/or

clogged exhaust filters could possibly lead

to elevated pump temperatures which

could, under certain circumstances, cause

the lubricating oil to self-ignite.

3.6 Overhaul Kit/Filter

An overhaul kit containing a set of gaskets and O-rings,

vanes, bearings and bearing sleeves, shaft seals and

taper pins, is available from the factory. Also, a filter kit

containing oil drain plug, gaskets, automotive-type oil

filter, exhaust filter, and synthetic baffle strainer (where

applicable), is available from the factory. When order-

ing, please specify pump size and model (a 4-digit suf-

fix after size), and serial number.

4.0 DISASSEMBLY

All R 5 Series, Single Stage, Rotary Vacuum pumps

should only be disassembled and reassembled by qual-

ified personnel. Caution must be exercised to prevent

damage to the pump components.

4.1 Necessary Tools

To disassemble/assemble all the R 5 Series pumps, the

following tools are recommended:

Allen Wrench: 2.5mm, 4mm, 6mm, 12mm

Filter Wrench: (Strap wrench)

Open End Wrench: 10mm, 12mm, 13mm, 15mm,

17mm, 19mm, 22mm, 24mm, 27mm, 32mm

Socket Wrench with Extension: 10mm, 13mm, 17mm,

19mm, 24mm

Hex Head Nut, Regular Pitch: 6mm, 8mm

Screwdriver

Drum Plug Wrench

Rubber Mallet

Gear Puller (Fan and Coupling)

Dial Indicator with Magnetic or Clamp-on Base

Arbor Press to Install Bearing and Shaft Seals

Loctite 242 for Shaft Seal and Bearing Installation

Miscellaneous Feeler Blades 18 inches long: .03mm,

.04mm, .06mm, .07mm, .09mm.

Shaft Seal Bearing Installation Tool, Shaft Seal

Installation Sleeve, and Rotor Pulling Tools (Available

from Busch, Inc. in Virginia Beach).

4.2 Complete Disassembly

Shut the pump off and disconnect power supply to the

motor. Drain the oil through the oil drain plug (Ref. 95).

(See pump illustrations Figures 16, 17 and 18 for part

identifications.) Tilt the pump toward the oil drain plug,

allowing it to drain.

Remove the motor (Ref. 400) from the motor mounting

bracket (Ref. 300) by removing four hex head cap

screws (Ref. 401).

Remove the pump side coupling half (Ref. 310) by loos-

ening the set screws. A gear puller will be necessary to

pull the coupling off the rotor shaft. Extreme care must

be given to the end of the rotor shaft so that the shaft

center is not damaged by the gear puller.

Note: "Wood’s" type couplings have a special spacer,

one on the motor shaft and one on the pump shaft.

Mark these for correct reassembly before removing

them.

Remove the motor mounting bracket (Ref. 300) from

the cylinder endplate (Ref. 25) by removing three (3)

hex head nuts (Ref. 303).

Remove the oil cooling coil (Ref. 240) (not applicable on

0502/0630 pumps) by loosening the fittings from the

exhaust box and the pump module.

Remove the fan cover (Ref. 340) from the cylinder end-

plate (Ref. 26) by removing the three (3) sheet metal

screws (Ref. 341).

Remove the fan (Ref. 321) from the rotor shaft of the

pump module by loosening the set screw. On

0400/0502/0630 pumps, there is a locking disc (Ref.

327) connected to the end of the fan side rotor shaft

which needs to be removed prior to removing the fan.

Remove the fan (Ref. 321) with a gear puller. There is

also a distance ring (Ref. 320) behind the fan that

needs to be removed (0400/0502/0630 only).

Model 0502/0630 pumps are equipped with a cooling

radiator (Pos 241) installed at the fan side of the pump.

The following oil fittings need to be loosened (Ref. 221,

223, 224). Remove the six hex head cap screws (Ref.

357) which will allow the removal of the radiator and

radiator side center ring (Ref. 351). It is now possible

to remove the fan guard (Ref. 352), fan (Ref. 321), dis-

tance ring (Pos 320), and center ring (on endplate side)

(Ref. 350).

On RA pumps, the gas ballast valve (Ref. 440) can now

be removed from the fan side endplate.

On RC pumps, remove the oil return line (Ref. 290)

from the inlet flange (Pos 260) and the exhaust box

(Ref. 75). On RA Models, oil non return valve (Ref.

275) should be removed and checked.

Loosen and remove all hydraulic fittings connected to

the endplates (Ref. 25/26) and the exhaust box (Ref.

75).

Remove the exhaust box cover plate (Ref. 205) which

is located to the right of the oil sight glasses.

WARNING: Shut the pump off. Lock the

electrical panel in the off position to pre-

vent the power from accidently being rein-

stated during the operation.

WARNING: Do not apply pressure or vacu-

um by mouth.

With the inside of the exhaust box now visible, the

exhaust valve cover plate (Ref. 169) with gasket (on RA

pumps only) can now be removed by loosening and

removing a hex head nut or a bolt in the center of the

cover plate.

If only the exhaust valves (Ref. 159) need to be taken

out or replaced, it will not be necessary to separate the

pumping module from the exhaust box.

To separate the pump cylinder (Ref. 1) from the exhaust

box (Ref. 75), remove the hex head cap screws (Ref.

186) with lockwashers (Ref. 187) from within the

exhaust box. On 0160/0250 models, there are internal

and external nuts and screws that have to be removed.

The exhaust box can now be separated from the pump

module. The gasket (Ref. 185) can be removed and

replaced, if necessary.

The exhaust valves can now be removed by loosening

the slotted machine screw with a large screwdriver (for

plastic valves) or with a 10mm socket wrench (for all

steel valves).

The sheet metal piece (Ref. 78), which is located

towards the bottom of the exhaust box, and the steel

dernister (Ref. 79), which is located towards the fill plug

inside the exhaust box, can now be removed for clean-

ing or replacement. The sheet metal piece will require

some bending to remove it.

The inlet housing (Ref. 260) can be removed from the

module by removing four hex head cap screws (Ref.

265). The inlet housing comes in two pieces. The inlet

screen should be cleaned or replaced. The anti-suck-

back valve (Ref. 251-255) needs to be looked at to

assure proper function. Check to see that the valve

plate (Ref. 251) moves freely and seats properly. The

spring (Ref. 254) should be adjusted so it holds the

valve plate slightly ajar. All O-rings and/or gaskets

should be replaced, if necessary, before reassembling.

To check exhaust filters (Ref. 120), it will be necessary

to remove the exhaust end cover plate (Ref. 140) by

removing either the hex head cap screws (Ref. 142) for

the 0160 model or the socket head cap screws (Ref.

142) for the 0400/0502/0630 models. The synthetic

baffle (Ref. 130) needs to be removed and replaced, if

necessary.

Remove filter springs (Ref. 125) by loosening pan head

machine screw (Ref. 126) with a screwdriver. Push the

filter spring with a large screwdriver from the frame so

that the spring assembly pops out. Slide the exhaust fil-

ters (Ref. 120) with O-rings (Ref. 121) out of the

exhaust box. Examine filter elements to see if they are

clogged. See Section 3.3 for details.

To replace the automotive type oil filter (Ref. 100), the

pump should have been running for at least 15 minutes,

so that the oil is warm. Then turn the pump off, remove

the oil drain plug (Ref. 95), and drain the oil. With an

automotive type filter wrench (strap wrench), remove

the oil filter, and replace with a new one. Coat face of

gasket on new filter with oil and hand tighten until gas-

ket contacts base, then tighten two-thirds turn more.

Do not overtighten. Use only a genuine Busch filter.

4.3 Disassembly of Pump Module

Set module on a table or vise with the exhaust port fac-

ing down and the inlet facing you (see Fig. 8 and 9).

Remove threaded taper pin (Ref. 60) by placing a

washer or lockwasher over thread and then a 6mm or

8mm nut against the washer/lockwasher to loosen the

taper pins. Use of a lockwasher acting as a spring will

ease removal. In essence, the washer/lockwasher is

used as a spacer and the 6mm or 8mm nut is used as

a jackscrew to draw the pin out.

Remove the hex head cap screws (Ref. 53)so the end-

plate may be separated from the pump cylinder. Be

careful not to damage the sealing faces, O-ring (Ref.

50) or paper gaskets between the endplates. If the end-

plates do not come off easily, tap gently with a rubber

mallet or soft hammer, or remove all threaded studs

(Ref. 4) from the cylinder. On older pumps with gaskets

between endplates and cylinder, take note how many,

and the thickness of the gaskets used on each side of

the cylinder. The same quantity and thickness can be

used upon assembly if no major parts were replaced or

machined.

The rotor (Ref. 15) and vanes (Ref. 22) can now be

removed from the cylinder (Ref. 1). Care must be taken

when removing the rotor to prevent damaging the rotor

or the cylinder.

Inspect vane slots for wear. The slot walls should be

parallel to each other. If the slots are worn in a V pat-

tern the rotor should be replaced. Insert a new vane in

the slot and measure the gap between the vane and the

slot wall. If the gap exceeds .3mm replace the rotor.

Check the rotor for trueness before reassembly. This

can be done by chucking the rotor in a lathe and check-

ing the run-out or eccentricity (T.I.R.). The maximum

allowable run-out is 0.02mm (0.001”). See the

Clearances Chart on page 21.

The bearings (Ref. 30) and shaft seals (Ref. 35) can be

removed from the endplates via an arbor press using a

bearing and shaft seal removal tool (see Fig. 2 and 3).

WARNING: Wear safety glasses when

removing or installing the exhaust filter

springs. Be prepared for the possibility of

the spring suddenly releasing if it is not in

the spring pocket correctly.

To remove the bearing and/or seal sleeves (Ref. 18)

from the rotor, clean the rotor shaft with a fine emery

cloth, removing any possible residue buildup or nicks

and bruises. Stand the rotor on end with the end from

which the sleeve is being removed facing down. Heat

the sleeve with a propane torch, being careful to con-

centrate heat on the sleeve while the rotor is being

slowly turned; the sleeve should then fall off. If the

sleeve does not come off with this method, a pencil

grinder should be used to grind the sleeve off. Care

must be taken not to grind into any part of the rotor

shaft. The sleeve will usually pop when you get close

to the rotor shaft.

5.0 CLEANING PROCEDURES

After disassembly of pump, it will be necessary to clean

all parts in a suitable solvent such as acetone or

trichloroethylene. All flat surfaces should be honed with

a honing stone to assure flatness. If the cylinder is

scored on the inside, the surface can be honed. The

endplates, cylinder, and rotor should not be machined

without first consulting with Busch Service Department

in Virginia Beach. They can be honed with a flat hon-

ing stone or fine emery cloth.

Old gasket material might have to be removed with a

putty knife.

Exhaust filters (Ref. 120) cannot be cleaned and

reused. Replace clogged or damaged filters with new

ones.

Synthetic baffles (Ref. 130/131) need to be replaced if

brittle and dark colored.

Rotor slots need to be cleaned and polished with a fine

emery cloth to assure loose movement of vanes in the

rotor slots. Check rotor surfaces and edges for bruises

or burrs and use either emery cloth or a fine file to

remove any bad spots on the rotor. The flat ends of the

rotor need to be honed with a flat honing stone; no

machining should be attempted. Do not push or sand

the areas of the shaft where the bearing and seal

sleeves sit.

6.0 PREPARATION FOR ASSEMBLY

6.1 Endplate Preparation

As the endplate is prepared for assembly pay particular

attention to honing of surfaces, O-ring or gasket

replacement, bearings and shaft seal installation, vacu-

um grease in shaft seals, oil in needle bearings, Loctite

on outside circumference of bearing and shaft seal and

shaft seal retainer plate on new version to be put on

after module has been reassembled.

6.2 Exhaust Box Preparation

All inside parts should have been removed and cleaned

or replaced. After cleaning, return the sheet metal baf-

fle (Ref. 78) in the bottom of the reservoir. Replace

steel demister pad (Ref. 79). A new synthetic baffle

(Ref. 130) needs to be placed behind the exhaust fil-

ters. New drain plugs with their respective O-ring gas-

kets are included in the filter kit so they should be

replaced. A new automotive type oil filter (Ref. 100)

should be put on the exhaust box.

7.0 ASSEMBLY

7.1 Exhaust Valves

Prior to assembling the exhaust valves, examine the

sealing surfaces for rust, pitting or corrosion. Check the

spring washers to be sure they have retained their

spring tension. If any part is not in good enough condi-

tion replace the whole valve assembly (see Fig. 4).

Put Loctite 242 on the bottom of the valve stem, thread

and screw the valve assembly into the matching hole on

pump cylinder. Correct assembly of the exhaust valve

is critical.

Prior to attaching the steel exhaust valve assembly to

the cylinder, check to see that the valve plate (washer-

type piece) moves freely.

CHAM. (TYP.)

MODEL

160

250

502

400

630

DIA.

NO.

PART

3 1/2

4 3/4"

2.441"

811.042.01

2.433"

1.555"

1.547"

Fig. 2 - Disassembly of Bearing Module

Fig. 3 - Bearing and Shaft Seal Removal Tool

Press

Needle bearing

Shaft

seal

Work plate

End plate

Bearing and shaft

seal removing

tool (see Fig. 8)

7.2

Bearings, Bearing Sleeves, Shaft Seals

If the bearing and seal sleeves (Ref. 18) have been

removed the new bearing sleeves need to be preheat-

ed prior to installation. Preheat sleeves in an oil bath

(approximately 250°F), an induction bearing heater or a

hot plate. Install the sleeves on the shaft so they touch

the shoulder of the rotor. Use the bearing sleeve instal-

lation tool (see Fig. 5) to position the sleeve.

Bearings should be installed using an arbor press and

special tool (see Fig. 6) to insure proper depth of bear-

ings . Using a hammer to install the bearings may dam-

age them. Other special tools are also required for

installation of the bearings and shaft seals (see Fig. 7).

1" X 45

D 3.150 5.906

C 1.200 1.783

B 1.575 2.047

A 3.740 6.496

0160/0250 0400/0502/0630

Dimensions are in inches

Fig. 5 - Bearing Installation Tool

Fig. 6 - Bearing and Shaft Seal Installation Tools

Fig. 7 - Shaft Seal Installation Tool

Fig. 4 - Exhaust Valve Assembly

The shaft seal (Ref. 35) should be installed with the

spring side towards the bearing. Verify that the shaft

seal is equipped with a spring on the inner lip. Prior to

installing the shaft seal in the endplate, put a drop of

Loctite No. 242 on the outside circumference of the

shaft seal. Be sure that the correct seals (Buna or

Viton) are installed.

7.3 Pump Module for Regular Overhaul

For the 0160/0250 pumps only, place the pump cylinder

(Ref. 1) in a vise (see Fig. 8). Position of the assembly

depends on whether you have an older style, or a

newer style of pump.

For the 0400/502/0630 pumps only, place the cylinder

on a work bench with the inlet port facing you and the

exhaust port facing down (see Fig. 9). Place two small

pieces of 2x4s under the cylinder so that it will raise the

cylinder enough to be able to slip the endplates on later.

The cleaning procedure of the rotor in Section 5.0 must

be followed prior to installation of the rotor. With the

inlet of the cylinder (Ref. 1) facing you, the left will be

the motor side. Slide the rotor (less vanes) inside the

cylinder with the longer rotor shaft towards the motor

side. Take care not to damage the cylinder or rotor.

Place the vanes inside the rotor slots with the relief

grooves, if any, on the trailing side (see Fig. 9).

Endplates (Ref. 25 and 26) should have been prepared

as indicated in Section 6.1. If only a normal overhaul

was performed and the rotor, endplates or cylinder were

not replaced, the following procedure should be fol-

lowed. Carefully insert the endplates over the shaft.

The endplate with the fan cover mounting bosses (Ref.

26) goes on the fan side of the module (see Fig. 10).

Care must be taken not to damage the shaft seal when

sliding over the bearing sleeve. Preferably, one should

use a special shaft seal installation sleeve (see Fig. 11).

Note: Models 0160/0250-132/128, 0400/502/0630-

212/218, use a large O-ring (Ref. 50) to seal the end-

plate on the cylinder. Models 0160/0250-112/118 use a

paper gasket material to seal the endplate to the cylin-

der. On pumps with paper gaskets, use the same quan-

tity and thickness on each side as were removed during

disassembly. Cases in which it is not possible to iden-

tify what gaskets were removed, use one thick (0.1mm-

.0039”) gasket on each side. Place the paper gasket

over the studs on the pump cylinder. With endplates in

place, install the taper pins (Ref. 60) hand-tight, and

loosely tighten the nuts and bolts of the endplates by

hand. Tap the taper pins into the endplate and cylinder

with a hammer until a solid sound is heard. Now pro-

ceed to tighten all nuts and bolts with a wrench.

Fig. 8 - Position of Cylinder for RA/RC 0160

Fig. 9 - Position of Cylinder for RA/RC 0400,

0502 and 0630

Motor side

O-ring

Fan side

End plate

Inlet

Exhaust

Fig. 10 - Endplate Installation

D 3.150 5.906

C 1.378-1.374 2.047-2.043

B 1.299 1.732

A 1.205-1.201 1.780-1.772

0160/0250 0400/0502/0630

Dimensions are in inches

Fig. 11 - Shaft Seal Installation Sleeve

Shaft seal installation

sleeve (see Fig. 14)

Taper pin holes

parallel to floor

It will now be necessary to check for proper axial and

radial clearances. The axial clearance is checked by

installing a dial indicator on one end of the shaft (see

Fig. 12). Pull the opposite end of the shaft as far as it

will pull away from the dial indicator. Set the indicator

at zero (0). Push the shaft toward the dial indicator as

far as it will push. The reading on the dial indicator will

be your axial clearance. The recommended axial clear-

ances are shown in the chart located near the back of

this manual (see page 21).

Check the radial clearances (see Fig. 13) by inserting a

feeler gauge blade into the inlet of the pump in the

direction of the smallest clearance between rotor and

cylinder. Check the radial clearance in three (3) loca-

tions along the rotor. The recommended radial clear-

ances are shown in the chart located near the back of

this manual (see page 21).

If clearances check out okay, one may proceed to

assemble the pump. If clearances do not correspond to

what they should be or if a new rotor, endplates or cylin-

der were used, one will have to use the procedure men-

tioned for Assembly of Module if the Rotor,

Endplates or Cylinder had to be replaced.

Note: On Models 0160/0250-112/118, the axial clear-

ances can be changed by either placing another paper

gasket between the cylinder and endplate to increase

the axial clearance or using a thinner gasket to

decrease the axial clearance. There should always be

at least one (1) gasket between the cylinder and end-

plate. On models with O-rings, the axial clearance is

preset and cannot be changed, but if the rotor sits in the

cylinder uneven (meaning cocked), it will give a false

axial clearance reading. The rotor needs to be aligned

straight with respect to the cylinder to be able to get the

necessary axial clearance.

Assembly of Module if the Rotor, Endplates,

or Cylinder had to be Replaced:

Make sure that all parts have been wiped clean of oil

and that flat surfaces have been honed with smooth

sand stone prior to assembly.

With the cylinder (Ref. 1) in the vise (0160/0250 only)

positioned as indicated in Figs. 8 or 9, measure the

length of the cylinder and the length of the rotor (Ref.

15) with a micrometer or other available measuring

device, if at all possible. These measurements can

help in determining axial clearance in the assembled

stage. If the above measured axial clearance is not

obtained after the endplates are assembled, it gives an

indication that the rotor is cocked inside the cylinder

housing. If a micrometer or other measuring device is

not available, use the recommended distances men-

tioned in the clearance chart.

Place the rotor (Ref. 15) carefully inside the pump cylin-

der (Ref. 1) with the long shaft end on the motor side.

With the inlet of the cylinder facing you, the motor side

is to your left.

Place vanes inside the rotor slots. Check the vanes to

be sure they do not extend beyond the length of the

rotor; if they are too long, sand down the ends with a

medium grade sand paper (see Fig. 9). Make sure that

the rotor is not resting on one of its slots when assem-

bling.

Insert two .07mm (0.0027 in.) feeler gauge blades for

0160/0250 pumps and .08mm (0.0031 in.) for

0400/502/0630 pumps through the inlet, over the top

and underneath the rotor to the far left and far right

position of the cylinder (see Figure 13). The rotor

should be sitting on the feeler blades. The feeler gauge

shown in Fig. 13 is only for checking radial clearances

after assembly.

Slide motor side endplate (Ref. 25) onto the rotor shaft

using a seal installation tool (see Fig. 11) and install cap

screws hand tight. Slide fan side endplate (Ref. 26) on

rotor shaft and hand-tighten bolts.

Install the rotor pulling tool (see Fig. 14) onto the fan

side rotor shaft. Use the puller to pull the rotor toward

the fan side endplate squaring the end of the rotor to

the face of the endplate. Rotate the rotor and endplate

(within the endplate mounting holes) until the two taper

pins can be inserted into the cylinder. Push (by hand)

the pins into the cylinder, providing a partial alignment

intended to return the assembly near its original posi-

tion. If the cylinder was machined, the taper pin holes

will be slightly off.

Fig. 12 - Axial Clearance Measuring

Fig. 13 - Checking Radial Clearance

Note: A new cylinder will not have taper pin holes. A

new endplate will only have pilot holes.

When new parts are used the rotor and fan side

endplate should be rocked back and forth (within the

clearance of the mounting holes) until the bolts are cen-

tered within the holes. Once the endplate is centered,

tighten the mounting bolts.

When the existing parts are used but the

cylinder has been machined proceed with the

loosely inserted taper pin method. After tightening the

fan side endplate mounting bolts, proceed to the motor

side endplate. Center the motor side endplate by

loosely inserting the taper pins or by the "feel" method

of working it back and forth. Tighten the motor side

endplate mounting bolts.

Loosen the rotor pulling tool, but leave the pulling tool

on the shaft since it will assist you in turning the rotor.

Remove the feeler blades by turning the rotor from the

fan side counterclockwise (see Fig. 13). Check the tips

of the feeler gauge blades to make sure nothing has

broken off. It will be necessary to remove the broken

piece, and start over if a piece of the feeler gauge blade

has broken off.

Attach a dial indicator on the motor side rotor shaft as

indicated in Fig. 12 to check axial clearance. Do not

change anything until the radial clearance is checked.

Follow the same procedures as mentioned previously.

If the resistance of the feeler blades between the rotor

and the cylinder feel tighter on one end of the cylinder

than the other, use a hammer to tape the endplate on

the tighter side slightly upward until an even resistance

of the feeler blade can be measured on both ends of the

rotor. A difference of .02mm (.0008 inch) radial clear-

ance can be tolerated between the fan side and the

motor side of the rotor as long as the minimum clear-

ance is maintained. If the rotor is square with the end-

plates, but the rotor to cylinder clearance between the

motor side and fan side differs more than .02mm, the

cylinder must be remachined. The rotor should turn

freely after the removal of the feeler blades.

The axial clearance should be checked again and if the

readings are still not within the correct tolerances, it is

recommended to start over again. Both the axial and

radial clearances have to be within the recommended

tolerances in order to proceed. A reworked cylinder can

occasionally be machined with a taper or irregularity in

the bore. If a bore is suspected to be irregular, it is all

the more important to make sure the end of the rotor is

parallel with the inside face of the endplates.

After clearances are correct, proceed to prepare to drill

out the taper pin holes by closing the inlet with a clean

rag and covering the bearing seals with a rag. Plug any

open holes in the endplates. Look into the taper pin

holes in the endplates with a flashlight to see how close

the old taper pin holes are from the endplate, and line

up the taper pin holes in the cylinder. If the holes are

only slightly off, redrill the holes with the same size

tapered drill as was used originally. If the holes do not

line up very close, it will be necessary to drill out the

holes to the next larger size and use taper pins the next

larger size. To prevent from drilling too deeply into the

pumping module, it is recommended to measure the

depth of the old holes. Make yourself a mark with tape

on your drill bit to assure the proper depth. Use a

tapered reamer to ream the holes out after drilling.

These tools are available from Busch, Inc.

Put a little bit of "Never Seize" on the new taper pins

and insert them into the endplates. Lightly tap them

with a hammer to insure proper seating.

Squirt oil into the pump module and turn rotor by hand

to lubricate vanes and rotor slots well. The pump can

now be reassembled.

7.4 Pump Assembly

When the pump module was separated from the

exhaust box for repair, follow these reassembly instruc-

tions:

Reconnect exhaust valves (Ref. 159) on the pumping

module for 112/132/212 pumps. See Section 7.1.

Reconnect the pumping module to the exhaust box

(Ref. 75) after placing the proper gasket (Ref. 185) in

between the module and the exhaust box.

HEX HEAD CAP SCREW

TYP (3) PLACES - G

Pump A B C D E F G H

160/250 90 100 15

30.2-

30.5

50 72

M8x

400/502

630

110 42 15

45.2-

45.3

70 90

M10x

Fig. 14 - Rotor Pulling Tool

Dimensions are in mm

Attach all oil lines leading from the exhaust box to the

module endplates (Ref. 231/232), except the oil return

line (Ref. 290).

The oil lines on Model 0630 connect to the radiator and

are then distributed to the endplates.

Reconnect the oil cooling coil (Ref. 240) (not applicable

on Model 0502/0630).

Make sure all hydraulic fittings are good and tight.

Attach motor mounting bracket (Ref. 300) to the motor

side endplate (Ref. 25).

Prior to Bowex "gear type" coupling installation (Ref.

310), check serrated edges of the coupling halves for

burrs that would prohibit the coupling insert from sliding

freely. Install the pump side coupling half (Ref. 310)

and tighten set screws. A distance of 4mm must be

maintained between the pump coupling half and the

motor coupling half when the pump and motor are con-

nected (see Fig. 15).

Measure the distance from the end of the pump cou-

pling half to the face surface of the motor mounting

bracket, which is indicated in Figure 15 as Distance "A".

Subtract 4mm from Distance "A". This measurement is

the distance from the motor coupling, which is indicated

in Figure 15 as Distance "B". This is for Bowex cou-

plings only. The most current coupling used is a

"Wood’s" type coupling. This coupling when properly

adjusted, will allow the sleeve to move 1mm (clearance)

back and forth from flange to flange. The pump and

motor come from the factory with a set of spacers that

automatically set the correct sleeve clearance. If these

spacers are reassembled the same as originally

installed, the clearance will be correct. Place a locking

disc on the end of the motor shaft to hold coupling and

cooling fan in place. Coupling set screws cannot be

tightened due to the cooling fan; that is why a locking

disc is used. For the 0502/0630 pump, mount the pump

coupling half in such a way so that the coupling half pro-

trudes outward from the rotor shaft by 10mm. The

motor coupling half is mounted flush against the motor

shaft and is held in place by two set screws.

Note: Make sure to Loctite set screws in place for all

couplings and motor fans to prevent movement.

Install the gas ballast (Ref. 440) on the fan side end-

plate (Ref. 26) on 112, 132, and 212 models only.

Install the fan side cooling fan (Ref. 321) flush against

the rotor shaft bearing sleeve (Ref. 18) on the

0160/0250 models. Tighten set screws on the fan

mounting boss. On the 0400 models, insert a distance

ring (Ref. 320), then slip on the fan (Ref. 321) and tight-

en the set screw. Attach the fan cover (Ref. 340) on the

fan side endplate (Ref. 26). For the 0502/0630 pumps

slip on the distance ring (Ref. 320). Attach the metal

shroud (Ref. 350) to the endplate (Ref. 26). Attach the

fan (Ref. 321) and tighten the set screw. Place the lock-

ing disc (Ref. 327) on the shaft end. Attach the radiator

side metal shroud (Ref. 351) with the fan cover guard

(Ref. 352) and distance bolts (Ref. 355), in place.

Reconnect the radiator (Ref. 241) with the radiator

bracket on the metal shroud. Reconnect all the oil lines

at the same time.

Squirt Busch R530 oil into the pump module and turn

the rotor by hand to lubricate the vanes and rotor slots.

Attach the inlet housing (Ref. 260 and 250) to the mod-

ule using a gasket (Ref. 255) on Models 0160/0250-

112/118 and 0400/0502/0630-212/218, or an O-ring

(Ref. 80) on Models 0160/0250-132/138 or new type

0400/0502/0630-212/218. Make sure the anti-suck-

back valve is functioning and that the O-ring (Ref. 253)

is in good condition.

Reconnect the oil return line (Ref. 290) or non-return

valve (Ref. 275). Do not over-tighten.

Connect the motor (Ref. 400) to the motor mounting

bracket (Ref. 300) with the fan (Ref. 322) attached to

the motor shaft for pump Models 0160/0250-112/118,

132, 138 and 0400-212/218. The 0502/0630 model

does not use this fan. Make sure the motor coupling

half is on the motor shaft and the coupling insert has

been placed on the module side coupling half. See

Figure 15 for proper coupling insert play.

Fill the pump to the proper level on the oil sight glasses

with Busch 500 Series oil.

Connect the proper power supply to either the motor

conduit box or the pump manual starter. Be sure all the

connections are tight.

Fig. 15 - Coupling Adjustment

CAUTION: The rotor in this pump is free

floating. If the coupling is too tight it will,

when hot, force the rotor into the fan side

endplate causing damage to the pump.

Jog the pump to determine the correct rotation of the

pump. The pump rotation should be counterclockwise

when looking at the motor fan from the motor end. If the

rotation is incorrect, change any two of the three lead

wires and check the rotation again.

8.0 CHANGING FROM RA TO RC MODEL

If a pump needs to be changed to either a RA or a RC

pump, it can easily be done by following the instruction

below.

Drain the oil.

Remove the oil non-return valve (Ref. 275) and copper

washer (Ref. 276) from the end of the exhaust box.

Remove the plug (Ref. 270) and copper washer (Ref.

271) from the inlet flange.

The gas ballast valve (Ref. 440) can be removed if

there is no chance of water vapor condensing in the

pump module. If water condensation could be a prob-

lem, it is recommended that the gas ballast is left in

place. The gas ballast can easily be removed on

0160/0250 and 0400 pumps by removing the fan cover

(Ref. 340) and the fan (Ref. 321). After removing the

gas ballast, be sure to close the opening with a plug

(Ref. 46) and a copper washer (Ref. 47). The hex head

screws (Ref. 441/442), which hold the gas ballast

bracket to the exhaust box, can be reinstalled by plac-

ing some Loctite and a copper washer on the screw. To

remove the gas ballast from a 0502/0630 pump, it is

recommended to lift the pump in the air and remove the

hydraulic fitting without removing the radiator. It is very

tight to get in there, but it can be done.

If the vacuum requirements are only in the 15 Torr

range, it is recommended to remove the exhaust valves

(Ref. 159) on the 132 and 212 models. On Model 112,

the valves can be left in, since it would take a complete

disassembly of the pump to remove them. See Section

4.2 for removal of exhaust valves.

Connect the oil return line (Ref. 290) with the elbow fit-

ting (Ref. 291) to the inlet flange where the 1/8" plug

and washer (Ref. 270/271) were removed. The elbow

fitting needs to be screwed into the inlet before attach-

ing the oil line to it (use some Loctite 242).

Connect the banjo fitting (Ref. 286) to the other end of

the oil line. Make sure that the lipped end of the banjo

fitting is facing the exhaust box.

Do not over-tighten the banjo screw (Ref. 285) or the

threads inside the aluminum exhaust box will be

stripped.

To change from a RC 118, 138, 218 to a RA 112, 132,

212, use the same instruction in the reverse order. You

might not be able to obtain an end vacuum of 29.98 in

Hg. at blank-off. Please consult the factory for further

information.

8.1 Difference between RA and RC Pumps

The RC model pumps 118/138/218 can run continuous-

ly because any oil buildup in the exhaust filter area of

the exhaust box is constantly being sucked through the

oil return line into the module through the inlet flange.

Since this oil return line will also carry some atmos-

pheric air, it reduces the vacuum level at blank-off to

about 15 Torr or 29.3 in. Hg.

On RA model pumps an oil non-return valve is used. It

is a ball check valve. When the pump is running, this

check valve will close automatically. When the pump is

not in operation, the check valve will open up and allow

the oil from the exhaust filter area to drain into the pump

oil sump.

Older RA pumps had to be shut down periodically to

allow any oil buildup to drain back into the sump. If this

was not done, the oil would collect in the exhaust filter

area to a point where it would be blown out of the

exhaust port; the pumping module was also being

deprived of oil which could result in vane damage.

Since there was no atmospheric air being introduced at

the inlet through an oil return line, the pump was able to

run at a blank-off pressure of .5 Torr or 29.9 in. Hg.

Newer model RA 0400/0502/0630 pumps are

provided with an oil level float valve as described

in Section 2.2, but an older existing pump in the field

can be modified to have this oil float valve assembly by

ordering a float valve kit Busch P/N 0946.529.715.

Contact the Service Department of Busch, Inc. in

Virginia Beach is you wish to add this feature to an

older pump in the field or if you are unsure whether you

pump has this feature already.

9.0 OIL LEVEL SWITCH INSTALLATION

Contact the factory.

Remedy:

Replace the automotive-type oil filter, exchange the oil,

if necessary, and refill with fresh oil.

Possible Cause:

The inlet anti-suck-back valve plate (Ref. 251) is stuck

in the closed or partially open position due to contami-

nation.

Remedy:

Disassemble the inlet valve and screen. Clean as

required.

Possible Cause:

Oil tubing fittings are loose and leaking. Oil return line

broken on RC model.

Remedy:

Replace or retighten oil fittings or oil tubing. Replace

only with the same size tubing.

Possible Cause:

Shaft seal leaking.

Remedy:

Replace the shaft seal following disassembly and

assembly instruction. Check the shaft seal. It should

have a spring installed inside and around the shaft seal-

ing lip. Check and replace the shaft seal/bearing sleeve

if worn.

Possible Cause:

The exhaust valve (Ref. 159) is not properly seated or

is partially stuck open (RA models only).

Remedy:

Follow the disassembly and assembly instructions or

contact the nearest Busch Factory Service Center.

Possible Cause:

Vanes are stuck in rotor or otherwise damaged.

Remedy:

Free vanes or replace with new ones following disas-

sembly and assembly instructions or contact the near-

est Busch Factory Service Center.

10.0 TROUBLE SHOOTING

10.1 Trouble

The pump does not reach "blank-off" pres-

sure which is the lowest absolute pressure

(best vacuum) when running with the inlet

covered via a blank flange or a valve; or

pump takes too long to evacuate the system.

The blank-off pressure can be measured by

using a good quality capsule gauge.

Possible Cause:

Contaminated oil is by far the most common cause of

not reaching the ultimate pressure.

Remedy:

Shut off the pump after operating temperature has been

reached, drain the warm oil from the pump, and

exchange automotive type oil filter, if necessary. Flush

and fill pump with new oil and take a new blank-off

measurement after the operating temperature is

reached (at least 20-30 minutes).

Possible Cause:

Vacuum system or vacuum piping is not leak-tight.

Remedy:

Check hose and pipe connections for possible leaks.

Possible Cause:

Wire mesh inlet screen plugged (Ref. 261).

Remedy:

Clean the wire mesh inlet screen. Install an inlet filter if

problem repeats frequently.

Possible Cause:

No oil or not enough oil in oil reservoir.

Remedy:

Shut off the pump, add the necessary oil, or oil seems

contaminated, drain the balance of the oil from the

pump, exchange the automotive type oil filter, and refill

with fresh oil. Flush if necessary.

Possible Cause:

The automotive type oil filter is dirty or clogged (where

applicable).

Possible Cause:

Radial clearance between the rotor and cylinders is no

longer adequate.

Remedy:

Follow disassembly and assembly instructions on

resetting radial clearance correctly.

Possible Cause:

Internal parts worn or damaged.

Remedy:

Follow the disassembly and assembly instructions and

replace worn or damaged parts.

10.2 Trouble

The pump will not start.

Possible Cause:

The motor does not have proper supply voltage or is

overloaded; motor starter overload settings are too low

or wrong setting, fuses are burned; wire size is too

small or too long, causing a voltage drop at the pump.

Remedy:

Check correct supply voltage; check the overload set-

tings in the motor starter for size and setting according

to the motor nameplate data; check fuses; install the

proper size wire. If the ambient temperature is high,

use the next larger size overloads or adjust the setting

5% above the nominal motor nameplate value.

Possible Cause:

Pump or motor is blocked.

Remedy:

Remove the fan cover and try to turn the pump and

motor by hand. If frozen, remove the motor from the

pump and check the motor and pump separately. If the

pump is frozen, disassemble completely and remove

foreign objects in the pump or replace broken vanes.

10.3 Trouble

Pump starts, but labors and draws a very

high current.

Possible Cause:

Oil is too heavy (viscosity too high) or the ambient tem-

perature is below 5C° (41°F).

Remedy:

Change to R580 vacuum oil if very cold, or warm up the

pump oil before filling.

Possible Cause:

Pump runs in the wrong rotation.

Remedy:

Check for correct rotation which is counterclockwise

when looking at the motor from the motor's fan side.

Possible Cause:

Pump is overfilled with oil, or wrong kind of oil is used.

Remedy:

Correct oil level and quality, and use only Busch vacu-

um oil.

Possible Cause:

Exhaust filters in exhaust are clogged and burned black

with pump oil.

Remedy:

Replace exhaust filters; maintain proper oil condition,

oil level and use Busch R500 Series vacuum oil.

Possible Cause:

Exhaust filter is clogged due to process material.

Remedy:

Contact factory for recommendation or proper filter car-

tridge.

Possible Cause:

Loose connection in motor terminal box, not all motor

coils are properly connected. Motor operates on two

phases only.

Remedy:

Check motor wiring diagram for proper hook-up, espe-

cially on motors with six internal motor windings, tight-

en and/or replace loose connections.

Possible Cause:

Foreign particle in pump; vanes broken; bearing seiz-

ing.

Remedy:

Follow disassembly and assembly instructions and

remove foreign parts; replace vanes and bearings.

10.4 Trouble

Pump smokes at the exhaust side or expels

oil droplets from the exhaust.

Possible Cause:

Exhaust filter not properly seated with O-ring (Ref. 121)

in filter base or filter material is cracked.

Remedy:

Check condition and check for proper seating of

exhaust filters. Replace if necessary. Also, check filter

spring clips for tightness.

Possible Cause:

Exhaust filter clogged with foreign particles.

Remedy:

Replace the exhaust filter.

Possible Cause:

Oil non-return valve (Ref. 275) not working properly.

Proper function is that when blowing compressed air

into the check valve, it should close. When applying

vacuum on it, the check valve should open.

Remedy:

Free or replace the oil return check valve.

Possible Cause:

If an older RA Series vacuum pump run continuously

over 8 hours without ever being shut down, it may be

possible that oil accumulates behind the exhaust box

cover (Ref. 140) to the extent that oil is blown out of the

exhaust with the exhaust gas.

Remedy:

Shut pump down during break periods. Check that oil

return valve (Ref. 275) is free and drains oil back into

the exhaust box oil sump when the RA pump is

stopped.

Possible Cause: Oil return line (Ref. 290) on RC

pumps is clogged or broken.

Remedy:

Free the clogged line, replace the broken line, but only

with the proper size, and check that the oil is pumped

out of the oil sump while the vacuum pump is operating.

Note: An oil filling plug with pressure gauge is supplied

as a standard item for all R 5 Series pumps so that the

pressure in front of the exhaust filters can be monitored.

The green field indicates that the filters are still effec-

tive. Any back pressure in the red field requires imme-

diate change of the exhaust filter (Ref. 120).

10.5 Trouble

Pump runs very noisy.

Possible Cause:

Coupling insert is worn.

Remedy:

Replace coupling insert motor/pump coupling.

Possible Cause:

Bearing noise.

Remedy:

Follow disassembly/assembly instructions outlined in

this manual and the replace bearings.

Possible Cause:

Vanes stuck.

Remedy: Follow disassembly/assembly instruction;

replace vanes. Use R500 Series vacuum oil.

10.6 Trouble

Pump runs very hot.

Note: The oil temperature with a closed inlet should be

approximately 185-225°F depending on pump type. At

24 in. Hg, the oil in the pump can go above 225°F.

These values are taken at an ambient temperature of

68°F. The maximum recommended ambient operating

temperature for an R 5 is 100°F on a continuous basis.

When it is necessary to operate a pump in ambient tem-

peratures above this limit, careful oil monitoring and/or

optional water cooling is necessary. Contact the facto-

ry at Virginia Beach for details.

Possible Cause:

Not enough air ventilation to the pump.

Remedy:

Clean motor and pump air grills. Do not install pump in

enclosed cabinet unless sufficient amount of fresh air is

supplied to pump. On pumps with oil cooling coils,

clean outside fin assembly. Bring ambient air tempera-

ture down.

Possible Cause:

The automotive type oil filter (Ref. 100) is clogged and

pump does not receive enough oil.

Remedy:

Change automotive oil filter.

Possible Cause:

Not enough oil in oil reservoir or badly burned oil is

used for pump lubrication.

Remedy:

Flush (see Section 3.1.4) and refill only with Busch rec-

ommended oil. Increase oil change intervals.

Note:

On some high temperature applications, it may be nec-

essary to change to a high temperature oil such as

R590 or R570. Contact the factory for recommenda-

tions.

10.7 Trouble

Pump is seized.

Possible Cause:

Pump was operated without oil and vanes broke.

Remedy:

Disassembly and exchange vanes per instructions.

Possible Cause:

Pump was operated for an extended period of time in

the wrong rotation.

Possible Cause:

Liquid carryover into pump cylinder broke the vanes

while pump was running or oil broke the vanes on start-

up.

Remedy:

Install condensate trap on the inlet of the pump. Or,

pump was overfilled with oil in oil reservoir. Follow oil

filling procedure (see Section 1.1) and do not overfill.

Or, built-in anti-suck-back valve (Ref. 250 through 255)

is leaking while pump was shut down and vacuum was

left in manifold. Clean valve seat and check that anti-

suck-back valve holds vacuum on inlet when pump is

shut down. Or, two pumps or a receiver is on the same

main line. Install a manual or automatic operated valve

in front of each pump.

10.8 Trouble

Automotive-type oil filter (Ref. 100) does not

get warm within two to five minutes when

cold pump is started.

Possible Cause:

Automotive-type oil filter is clogged.

Remedy:

Replace oil filter and exchange oil.

Possible Cause:

Wrong automotive-type filter is used and/or oil lines

leading to pump are clogged.

Remedy:

Use only the proper Busch genuine oil filter and blow

lines free

11.0 LIMITED STANDARD WARRANTY

Busch, Inc. warrants that all products furnished by it are

free from defects in material and workmanship at the

time of shipment for a period of 18 months from the

date of shipment, or 12 months from the date of instal-

lation, whichever occurs first. Claims must be made

during that period and are limited to the replacement or

repair of parts claimed to be defective.

In the case of components purchased by Busch, Inc.,

such as starters, controls, mechanical seals, motors,

couplings, etc., the warranty of that manufacturer will be

extended to the purchaser in lieu of any warranty by

Busch, Inc. The replacement of wear items including,

but not limited to, seals, bearings, couplings, exhaust

cover gaskets, oil drain plugs, oil fill plugs etc., made in

connection with normal service are not covered by this

Warranty.

The Limited Standard Warranty is valid only when the

product has been properly installed, used in a normal

manner, and serviced according to the operating man-

ual. This warranty shall not extend to products that

have been misused, neglected, altered, or repaired

without factory authorization during the warranty period.

We highly recommend the use of Busch oils and parts

to achieve documented performance and efficient oper-

ation. The use of oils or parts other than Busch could

limit the life expectancy of the equipment and could void

any warranties if they are the cause of any damage.

Operating conditions beyond our control such as

improper voltage or water pressure, excessive ambient

temperatures, or other conditions that would affect the

performance or life of the product will also cause the

warranty to become void.

Permission to return parts for warranty repair must be

obtained, and all returns must be prepaid to the factory.

If, after examination, the product or part is found to be

defective, it will be repaired or replaced on a no-charge

basis and returned, FOB the factory. If it is determined

that the Warranty has not been breached by Busch,

Inc., then the usual charges for repair or replacement

will be made, FOB the factory. Parts or products that

are obsolete or those made to special order are not

returnable.

This Limited Standard Warranty applies only to the

above and is for the period set forth. Busch, Inc.'s max-

imum liability shall not, in any case, exceed the contract

price for the product, part, or component claimed to be

defective; and Busch, Inc. assumes no liability for any

special, indirect, or consequential damages arising

from defective equipment.

THERE ARE NO WARRANTIES IMPLIED OR

EXPRESSED THAT EXTEND BEYOND THOSE

CONTAINED IN THIS LIMITED STANDARD

WARRANTY.

Note: For extended warranties on your new equip-

ment contact Busch, Inc. Headquarters at 1-800-USA-

PUMP.

* Without gas ballast

TYPE

Length of

Cylinder

Rotor Cylinder Vanes Axial Radial

Bearings

Needle

160 140

+0.0

-0.025

+0.070

+0.050

-0.04

-0.08

max 0.095

min 0.050

0.03

0.07

0.020-

0.040

250 220

+0.0

-0.029

+0.100

+0.080

-0.12

-0.15

max 0.129

min 0.080

0.03

0.07

0.020-

0.040

400 265

+0.0

-0.032

+0.190

+0.165

-).18

-0.21

max 0.222

min 0.165

0.10

0.06

0.050-

0.035

502 330.6

+0.0

-0.032

+0.200

+0.175

-0.20

-0.24

max 0.232

min 0.175

0.10

0.06

0.050-

0.035

630 400

+0.0

-0.036

+0.245

+0.215

-0.20

-0.24

max 0.281

min 0.215

0.06

0.10

0.035-

0.050

Clearance Chart

After assembling the endplates, a reduction of .01mm of axial clearance is allowed.

Clearances are listed in millimeters.

Model 0160 0250 0400 0502 0630

Nominal pumping

speed

ACFM 115 170 305 375 455

Free air displacement CFM 117 180 330 413 490

Maximum sound level 1

meter from pump

dBA 79 81 83 84 85

Motor size for 3 phase HP 7.5 10 15 20 25

Motor rotational speed rpm 1750 1750 1150 1150 1150

Approximate oil capacity qt. 7 7 14 16 16

Inlet connection - NPT inch 2 2 3 3 3

End vacuum (RC) Torr 15 15 15 15 15

End vacuum (RA)* Torr 0.5 0.5 0.5 0.5 0.5

Approximate weight pounds 416 460 1152 1316 1525

Technical Data

Fig. 16 - Illustration of R 5 0160 Vacuum Pump

Parts List for R 5 0160

Ref Description

001 Cylinder

004 Stud

009 Stud

015 Rotor

018 Bearing sleeve

022 Vane

025 Motor side endplate

026 Opp. M.S. endplate

030 Needle bearing

031 Endplate spacer

032 Pump spacer

034 Slotted chs. hd. cap screw

035 Shaft seal

040 Protective screen

042 Shaft seal retaining plate

043 Hex head cap screw

046 Hex head plug

047 Copper ring gasket

050 O-ring

053 Hex head cap screw

054 Lockwasher

056 Hex head cap nut

060 Tapered pin

065 Shaft key

066 Shaft key

075 Exhaust box

078 Sheet metal baffle

079 Demister pad

083 Oil sight glass

084 Ring gasket

088 Oil fill plug

089 Oil fill plug gasket

090 Pressure gauge

095 Oil drain plug

096 O-ring

099 Nipple

100 Auto-type oil filter

115 Filter bracket

120 Exhaust filter

121 O-ring

125 Filter spring assembly

126 Socket head cap screw

130 Baffle strainer

136 Baffle strainer frame

140 Exhaust cover plate

141 Cover plate gasket

142 Hex head cap screw

143 Lockwasher

146 Hex head cap screw

152 Lockwasher

153 Exhaust silencer

154 Gasket

159 Exhaust valve

168 O-ring

169 Exh. valve cover plate

175 Stud

Ref Description

322 Motor side fan

340 Fan Cover

341 Sheet metal screw

342 Plastic insert

390 Eyebolt adapter

391 Eyebolt

392 Lockwasher

393 Hex head cap screw

400 Motor

401 Hex head cap screw

402 Lockwasher

416 Stud

417 Slotted set screw

419 Foot spacer

420 Flat washer

421 Rubber foot

423 Washer

424 Hex head cap nut

430 Nameplate

431 Arrow label

436 Maintenance label

470 Hydraulic fitting

471 Teflon tubing

472 Check valve

473 Bell reducer

474 Gas ballast filter

475 Gas ballast valve bracket

476 Elbow fitting

477 Pet cock valve

478 Hex head cap screw

479 Lockwasher

480 Oil tube insert

9000 Steel socket plug

9001 Hydraulic adapter

Ref Description

176 Lockwasher

177 Hex head nut

180 Plug

185 Gasket

186 Hex head cap screw

187 Lockwasher

189 Stud

190 Lockwasher

191 Hex head nut

200 Drum exhaust box plug

201 O-ring

205 Cover side plate

206 Gasket

207 Hex head cap screw

208 Lockwasher

220 Hydraulic fitting

222 Hydraulic fitting

223 Hydraulic fitting

224 Hydraulic fitting

230 Oil tubing

231 Oil tubing

232 Oil tubing

240 Cooling coil

250 Inlet flange

251 Valve guide

252 Valve plate

253 O-ring

254 Inlet check valve spring

255 O-ring

260 Inlet flange

261 Inlet screen

265 Hex head cap screw

266 Lockwasher

270 Plug

271 Ring gasket

275 Oil return valve

276 Ring gasket

285 Oil recirc. screw

286 Banjo hydraulic fitting

290 Oil return line tubing

291 Hydraulic fitting

292 Carburetor jet

300 Motor mounting bracket

302 Lockwasher

303 Hex shoulder nut

304 Socket hd. machine screw

305 Flat washer

306 C-face adapter flange

307 Socket head screw

311 Motor side coupling half

312 Coupling insert

313 Pump side coupling half

315 Protective screen

318 Protective screen

319 Spacer

321 Pump shaft fan

Fig. 17 - Illustration of R 5 0400 Vacuum Pump

Parts List for R 5 0400

Ref Description

001 Cylinder

004 Stud

005 Set screw

009 Stud

015 Rotor

018 Bearing sleeve

019 Shaft seal sleeve

022 Vane

025 Motor side endplate

026 Opp. M.S. endplate

030 Needle bearing

035 Shaft seal

040 Protective screen

041 Hex head nut

042 Shaft seal support ring

043 Hex head cap screw

046 Hex head plug

047 Copper ring gasket

050 O-ring

053 Hex head cap screw

054 Lockwasher

056 Hex head cap nut

060 Tapered pin

065 Shaft key

066 Shaft key

075 Exhaust box

078 Sheet metal baffle

079 Demister pad

080 Perforated sheet metal

083 Oil sight glass

084 Ring gasket

088 Oil fill plug

089 Oil fill plug gasket

090 Pressure gauge

095 Oil drain plug

096 O-ring

099 Nipple

100 Auto-type oil filter

105 Cover plate

106 Cover plate gasket

107 Socket head cap screw

108 Lockwasher

115 Filter bracket

116 Filter bracket

120 Exhaust filter

121 O-ring

125 Filter spring assembly

126 Socket head cap screw

130 Baffle strainer

136 Perf. sheet metal screen

137 Hex head cap screw

138 Flat washer

139 Lockwasher

140 Exhaust cover plate

141 Cover plate gasket

142 Hex head cap screw

Ref Description

312 Coupling insert

313 Pump side coupling half

319 Spacer

320 Fan and coupling spacer

321 Pump shaft fan

322 Motor side fan

327 Locking disk

328 Socket head cap screw

329 Lockwasher

340 Fan Cover

341 Sheet metal screw

342 Plastic insert

391 Eyebolt

400 Motor

401 Hex head cap screw

402 Lockwasher

417 Slotted set screw

418 Rubber foot

419 Foot spacer

420 Stud

421 Rubber foot

422 Rubber foot

423 Lockwasher

424 Hex head cap nut

430 Nameplate

431 Arrow label

436 Maintenance label

470 Hydraulic banjo fitting

471 Teflon tubing

472 Check valve

473 Bell reducer

474 Gas ballast filter

475 Gas ballast valve bracket

476 Elbow fitting

477 Pet cock valve

478 Hex head cap screw

479 Lockwasher

480 Oil tube insert

9000 Steel socket plug

9001 Flat washer

9002 Entrance elbow connector

9003 Fenwal temperature switch

9004 Grounding washer

9005 Plain washer

9006 Socket head cap screw

9007 Hex head cap screw

Ref Description

143 Lockwasher

146 Hex head cap screw

153 Cover plate exhaust screen

159 Exhaust valve

168 O-ring

169 Exh. valve cover plate

175 Hex head cap screw

176 Lockwasher

184 Socket head cap screw

185 Cylinder/Exhaust box gasket

186 Hex head cap screw

187 Lockwasher

200 Drum exhaust box plug

201 O-ring

205 Cover side plate

206 Gasket

207 Hex head cap screw

215 Reducing nipple

216 Ring gasket

220 Hydraulic fitting

222 Hydraulic elbow fitting

223 Hydraulic elbow fitting

224 Hydraulic banjo fitting

225 Hydraulic straight fitting

226 Hydraulic banjo fitting

230 Oil tubing

231 Oil tubing

232 Oil tubing

233 Oil tubing

240 Cooling coil

250 Inlet flange

251 Valve plate

252 Valve inlet guide

253 O-ring

254 Inlet check valve spring

255 O-ring

258 Ball, Viton

260 Inlet flange

261 Inlet screen

265 Hex head cap screw

266 Lockwasher

275 Oil return valve

276 Ring gasket

285 Oil recirc. screw

286 Banjo hydraulic fitting

290 Oil return line tubing

291 Hydraulic elbow fitting

297 Screen

298 Slot chs.. head screw

299 Rivet

300 Motor mounting bracket

302 Lockwasher

303 Hex shoulder nut

306 C-face adapter flange

307 Socket head screw

311 Motor side coupling half

Fig. 18 - Illustration of R 5 0502/0630 Vacuum Pump

R 5 00630 Shown

Parts List for R 5 0502/0630

Ref Description

001 Cylinder

004 Stud

005 Set screw

008 Stud

009 Stud

015 Rotor

018 Bearing sleeve

019 Shaft seal sleeve

022 Vane

025 Motor side endplate

026 Opp. M.S. endplate

030 Needle bearing

035 Shaft seal

039 Socket head mach. screw

040 Protective screen

041 Hex head nut

042 Shaft seal support ring

043 Hex head cap screw

046 Hex head plug

047 Copper ring gasket

050 O-ring

053 Hex head cap screw

054 Lockwasher

056 Hex head cap nut

060 Tapered pin

065 Shaft key

066 Shaft key

075 Exhaust box

078 Sheet metal baffle

079 Demister pad

080 Perforated sheet metal

083 Oil sight glass

084 Ring gasket

088 Oil fill plug

089 Oil fill plug gasket

090 Pressure gauge

095 Oil drain plug

096 O-ring

099 Nipple

100 Auto-type oil filter

105 Cover plate

106 Cover plate gasket

107 Socket head cap screw

108 Lockwasher

115 Filter bracket

116 Filter bracket

120 Exhaust filter

121 O-ring

125 Filter spring assembly

126 Socket head cap screw

130 Baffle strainer

136 Perf. sheet metal screen

137 Hex head cap screw

138 Flat washer

139 Lockwasher

140 Exhaust cover plate

Ref Description

313 Pump side coupling half

319 Spacer

320 Fan and coupling spacer

321 Pump shaft fan

327 Locking disk

328 Socket head cap screw

329 Lockwasher

350 Centering ring

351 Centering ring

352 Fan guard

353 Hex head cap screw

354 Hex head nut

355 Distance bolt

356 Mounting bolt

357 Hex nut

358 Lockwasher

360 Lockwasher

391 Eyebolt

400 Motor

401 Hex head cap screw

417 Slotted set screw

418 Rubber foot

419 Foot spacer

420 Stud

421 Rubber foot

422 Rubber foot

423 Lockwasher

424 Hex head cap nut

430 Nameplate

431 Arrow label

436 Maintenance label

470 Hydraulic banjo fitting

471 Teflon tubing

472 Check valve

473 Bell reducer

474 Gas ballast filter

475 Gas ballast valve bracket

476 Elbow fitting

477 Pet cock valve

478 Hex head cap screw

479 Lockwasher

480 Oil tube insert

585 Oil return float valve kit

586 Hydraulic fitting

591 Hydraulic fitting

9000 Steel socket plug

9001 Flat washer

9002 Entrance elbow connector

9003 Fenwal temperature switch

9004 Grounding washer

9005 Plain washer

9006 Socket head cap screw

9007 Hex head cap screw

Ref Description

141 Cover plate gasket

142 Hex head cap screw

143 Lockwasher

146 Hex head cap screw

153 Cover plate exhaust screen

159 Exhaust valve

168 O-ring

169 Exh. valve cover plate

175 Hex head cap screw

176 Lockwasher

184 Socket head cap screw

185 Cylinder/Exhaust box gasket

186 Hex head cap screw

187 Lockwasher

200 Drum exhaust box plug

201 O-ring

205 Cover side plate

206 Gasket

207 Hex head cap screw

222 Hydraulic elbow fitting

223 Hydraulic elbow fitting

224 Hydraulic banjo fitting

225 Hydraulic straight fitting

226 Hydraulic banjo fitting

230 Oil tubing

231 Oil tubing

232 Oil tubing

233 Oil tubing

236 Hydraulic fitting

238 Hex head nut

239 Lockwasher

241 Oil cooler

250 Inlet flange

251 Valve plate

252 Valve inlet guide

253 O-ring

254 Inlet check valve spring

255 O-ring

258 Ball, Viton

260 Inlet flange

261 Inlet screen

265 Hex head cap screw

266 Lockwasher

285 Oil recirc. screw

286 Banjo hydraulic fitting

290 Oil return line tubing

297 Screen

298 Slot chs. head screw

299 Rivet

300 Motor mounting bracket

302 Lockwasher

303 Hex shoulder nut

306 C-face adapter flange

307 Socket head screw

311 Motor side coupling half

312 Coupling insert

Busch Inc. Factory Service Centers

California Illinois

13826 Struikman Road 430 Windy Point Drive

Cerritos, CA 90703 Glendale Heights, IL 60139

Phone (562) 926-8422 Phone (630) 545-1310

Fax (562) 926-7262 Fax (630) 545-1384

[email protected] [email protected]

New Jersey Puerto Rico

39 Davis Street 420 E Street, Suite 4

South Plainfield, NJ 07080 Minillas Industrial Park

Phone (908) 561-3233 Bayamon, PR 00959-1901

Fax (908) 561-3909 Phone (787) 798-5045

[email protected] Fax (787) 798-5033

[email protected]

Texas Virginia

15411 Vantage Pkwy W., Suite 216 516 Viking Drive

Houston, TX 77032 Virginia Beach, VA 23452

Phone (281) 449-2381 Phone (757) 463-7800

Fax (281) 449-2383 Fax (757) 463-7407

[email protected] [email protected]

P/N 872.004.01

Revision 12/04

Busch, Inc.

516 Viking Drive

Virginia Beach, Virginia 23452

Phone: (757) 463-7800

FAX: (757) 463-7407