Specifications and Reusability for Hydraulic Gear Pumps and Motors (Groups 9, 10, and 11) {5061, 506G, 5073} Caterpillar

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Introduction

Table 1

Revision	Summary of Changes in SEBF9140
22	Updated Effectivity
21	Updated Effectivity
20	Updated Effectivity
19	Updated Effectivity

© 2018 Caterpillar All Rights Reserved. This guideline is for the use of Cat dealers only. Unauthorized use of this document or the proprietary processes therein without permission may be violation of intellectual property law. Information contained in this document is considered Caterpillar: Confidential Yellow.

This Reuse and Salvage Guideline contains the necessary information to allow a dealer to establish a parts reusability program. Reuse and salvage information enables Caterpillar dealers and customers to benefit from cost reductions. Every effort has been made to provide the most current information that is known to Caterpillar. Continuing improvement and advancement of product design might have caused changes to your product which are not included in this publication. This Reuse and Salvage Guideline must be used with the latest technical information that is available from Caterpillar.

For questions or additional information concerning this guideline, submit a form for feedback in the Service Information System. To address an urgent issue, use the following resources to communicate your request to Caterpillar Repair Process Engineering:

• Caterpillar Dealer Technical Communicator

• Dealer Solution Network

• Caterpillar Technical Representative

• Knowledge Network

Canceled Part Numbers and Replaced Part Numbers

This document may not include canceled part numbers and replaced part numbers. Use NPR on SIS for information about canceled part numbers and replaced part numbers. NPR will provide the current part numbers for replaced parts.

Summary

This guideline shows visual examples of worn hydraulic pump and motor parts used on Caterpillar machines. Specifically, the guideline shows illustrations of gear pump and motor parts which cannot be used again without salvage operations.

Parts that can be used again according to this guideline can be expected to give normal performance until the next overhaul.

Important Safety Information

Illustration 1	g02139237

Work safely. Most accidents that involve product operation, maintenance, and repair are caused by failure to observe basic safety rules or precautions. An accident can often be avoided by recognizing potentially hazardous situations before an accident occurs. A person must be alert to potential hazards. This person should also have the necessary training, skills, and tools to perform these functions properly. Safety precautions and warnings are provided in this instruction and on the product. If these hazard warnings are not heeded, bodily injury or death could occur to you or to other persons. Caterpillar cannot anticipate every possible circumstance that might involve a potential hazard. Therefore, the warnings in this publication and the warnings that are on the product are not all inclusive. If a tool, a procedure, a work method, or operating technique that is not recommended by Caterpillar is used, ensure that the procedure is safe for you and for other people. Ensure that the product will not be damaged or be made unsafe by the operation, lubrication, maintenance, or the repair procedures that are used.

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Improper operation, lubrication, maintenance or repair of this product can be dangerous and could result in injury or death. Do not operate or perform any lubrication, maintenance or repair on this product, until you have read and understood the operation, lubrication, maintenance and repair information.

Safety precautions and warnings are provided in this manual and on the product. If these hazard warnings are not heeded, bodily injury or death could occur to you or to other persons.

The hazards are identified by the safety alert symbol which is followed by a signal word such as danger, warning, or caution. The "WARNING" safety alert symbol is shown below.

Illustration 2	g00008666

This safety alert symbol means:

Pay attention!

Become alert!

Your safety is involved.

The message that appears under the safety alert symbol explains the hazard.

Operations that may cause product damage are identified by "NOTICE" labels on the product and in this publication.

Caterpillar cannot anticipate every possible circumstance that might involve a potential hazard. The safety information in this document and the safety information on the machine are not all inclusive. Determine that the tools, procedures, work methods, and operating techniques are safe. Determine that the operation, lubrication, maintenance, and repair procedures will not damage the machine. Also, determine that the operation, lubrication, maintenance, and repair procedures will not make the machine unsafe.

The information, the specifications, and the illustrations that exist in this guideline are based on information which was available at the time of publication. The specifications, torques, pressures, measurements, adjustments, illustrations, and other items can change at any time. These changes can affect the service that is given to the product. Obtain the complete, most current information before you start any job. Caterpillar dealers can supply the most current information.

Safety

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Sudden movement of the machine or release of oil under pressure can cause injury to persons on or near the machine. To prevent possible injury, perform the procedure that follows before testing and adjusting the steering system.

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Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the attachments have been lowered, oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.

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NOTICE
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, PERJ1017, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products. Dispose of all fluids according to local regulations and mandates.

• Iron body pumps will cause a damaged look to the gear tooth tips during break-in. This damaged look is caused by the gear tooth tips contacting the rough iron housing of the pump. Along with the damaged look, the tooth tips will also have a lip or burr on the trailing edge. The damage is also caused by contact between the tooth tip and the iron housing.

• Do not install a part again if this guideline shows that the part cannot be used again.

• Do not use a part again if the part has wear or damage that is not shown in this guideline.

• When looking to see if a given part is reusable, be sure to remember the "cause and effect" relation to other parts. Generally, failure wear or damage to one part can affect the performance of connected parts. Here is an example of how one problem can be an indication of the source of a larger, future problem. There is light wear on the bearing diameter of the gear shaft. The wear is from contaminants which are embedded in the Teflon material that coats the bearing bores. The condition of the bearing is not easily seen at this early stage. If a new bearing is not installed, the wear will gradually increase and cause failure.

• Most of the illustrations in this guideline are of pumps and not motors. Pumps have a different purpose than motors, but wear and damage characteristics are similar in both. Normally, salvage procedures are the same in both, unless other procedures are given.

• Specifications needed to recondition gear type hydraulic pumps and motors are given in the "Service Manual" and in this guideline.

• The parts in hydraulic pumps and motors work together to give flow or torque. The efficiency of a unit is variable, according to the flow loss that any given group of parts permit. Be sure to test all rebuilt pumps for acceptable performance.

• Flame Spray is an acceptable method of restoring a surface to the original size. Each step in the procedure is critical in achieving the desired coating bond and the surface finish.

References

Table 2

References
Media Number	Title
REHS1832	"Bench Test Procedure for Gear Pumps"
SEBF9240	"Fundamentals of Flame Spray for Reconditioning Components"
SEBF2110	"Thermal Spray Procedures for Pump Drive Gear Inside Diameter"
SEBF2129	"Thermal Spray Procedures for Tyrone Drive Shaft (Pump Gear)"
SEBF2156	"Thermal Spray Procedures for Gear Shafts for Gear Pumps"
SEBF2160	"Thermal Spray Procedures for Bevel Gear Shafts"
SEHS8428	"Removing and Installing Bushings and Pressure Plates in Hydraulic Gear Pumps"
PEGJ0075	"CAT LOCTITE GLOBAL CROSSOVER LIST"
SEBF8073	"Specifications and Reusability for Hydraulic Gear Pumps and Motors"
NENG2500	"Dealer Service Tool Catalog"
SEBF9141	"Specifications and Reusability for Hydraulic Gear Pumps and Motors (Groups 1, 2, and 3)"
SEBF9173	"Specifications and Reusability for Hydraulic Gear Pumps and Motors (Groups 4, 5, and 6)"

Tooling and Equipment

Table 3

Part Number	Parts Description
4C-9507	Retaining Compound
6V-6050	Ultrasonic Cleaner Group
7B-0337	Surface Plate
9S-3500	UNF Thread Insert Kit
9S-3700	UNC Thread Insert Kit
Loctite 97453	Loctite ® Fixmaster Aluminum Liquid
Loctite AC-4368	Releasing Agent

Pump and Motor Identification Chart

This guideline is to be used only for gear pump and motor Groups 9, 10, and 11. Refer to specifications in Table 4 to verify the pump group. Once the pump group is verified, use Table 4 to choose the correct document number for the pump group.

Illustration 3	g01423021
Measurements are taken from these locations. (1) Number of gear teeth (2) Gear diameter (3) Journal diameter

Table 4

Pump and Motor Identification Chart
Group	Journal Diameter mm(inches)	Gear Diameter mm(inches)	Number of Gear Teeth	Pressure Plate Thickness mm(inches)	Bushing Style	Document Number
1	44.45 mm (1.75 inch)	77.22 mm (3.04 inch)	10	10.92 mm (0.43 inch)	Flush	SEBF9141
2	31.75 mm (1.25 inch)	60.96 mm (2.40 inch)	10	9.65 mm (0.38 inch)	Flush
3	39.62 mm (1.56 inch)	77.22 mm (3.04 inch)	10	10.92 mm (0.43 inch)	Flush
4	44.45 mm (1.75 inch)	77.22 mm (3.04 inch)	10	7.87 mm (0.31 inch)	Extended	SEBF9173
5	47.50 mm (1.87 inch)	91.44 mm (3.60 inch)	10	7.87 mm (0.31 inch)	Extended
6	47.50 mm (1.87 inch)	91.44 mm (3.60 inch)	10	10.67 mm (0.42 inch)	Flush
7	15.75 mm (0.62 inch)	30.99 mm (1.22 inch)	10	Bushing Block		-
8	22.10 mm (0.87 inch)	44.70 mm (1.76 inch)	10	Bushing Block
9	31.75 mm (1.25 inch)1.25	64.52 mm (2.54 inch)	8	6.60 mm (0.26 inch)	Extended	SEBF9140
10	39.62 mm (1.56 inch)	80.77 mm (3.18 inch)	8	7.87 mm (0.31 inch)	Extended
11	31.75 mm (1.25 inch)	60.96 mm (2.40 inch)	10	6.60 mm (0.26 inch)	Extended

Flange, Plate, and Body Assemblies

Nomenclature

Illustration 4	g01420727
Flange assembly for Groups 9 and 10 (front). (4) Mounting face (5) Pilot diameter (6) Weep hole plug (7) Seal bore

Illustration 5	g01420733
Flange assembly for Groups 9 and 10 (rear). (8) Body face (9) Seal groove (10) Alignment dowel (11) Bushing

Illustration 6	g01420734
Body assembly (blind bores) on the left. Plate assembly (through bores) on the right. (12) Gear bore (13) Bushing (14) Seal face

Note: Not all plate assemblies have gear bores.

Cleaning Procedure

Remove lip seals and remove weep hole plugs first. Wash the flanges, plates, and bodies with clean solvent. Use petroleum-based solvent. Try to clean inner surfaces. Clean weep hole plugs and clean the seal drain passages. Remove all sealant from the seal grooves. If all the sealant is not removed, the seal will not work correctly. If sealant cannot be removed with the solvent and a brush, use glass beads. Use beads of 80 to 150 micron (size 10) with 585 ± 35 kPa (85 ± 5 psi). Early flanges were equipped with metallic seal drain valves, which are made of Viton material. Before installing a new seal drain valve, a steel sleeve must be installed in the drain valve passage.

Inspection Procedure

Mounting Face

Illustration 7	g01420737
Fretting on the mounting face can be an indication that the face is bent.

USE AGAIN

Use the part again after the face is measured and that part is found to be acceptable.

Illustration 8	g01508722
Fretting on the mounting face of the pump can be an indication that the face is bent. Take two measurements on the face of the pump. One measurement near the pilot diameter (X) and one measurement near the mounting bolt hole (Y).

USE AGAIN

Use again if the difference between the two dimensions is 0.5 mm (0.02 inch) or less.

Seal Bore

Illustration 9	g03395531
Light scratches in the seal bore

USE AGAIN

Note: Apply 4C-9507 Retaining Compound around the joint between the seal case and the bore when installing a new seal. This will prevent seal to bore leakage.

Illustration 10	g03395538
Damage in the seal bore

USE AGAIN

The seal bore can be repaired. Refer to the "Procedure to Salvage Seal Bore" section in this document.

Bushing

Illustration 11	g01420761
Fretting in the outside diameter of the bushing in the seal area.

USE AGAIN

Illustration 12	g01420762
Typical example of bushing wear in which the bronze shows through the Teflon.

USE AGAIN

Bronze that is used in the bushings is porous. Because the bronze is porous, the Teflon overlay gets pushed into the pores during manufacturing. Gradual wear in the load zone will cause more of the bronze to show through. The bushing can still be used again because the surface is a mix of bronze and Teflon. The bronze also shows through when the Teflon in the non-load zone of the bushing becomes worn. The bushing can be used again even though the surface may be rough. Refer to Illustration 12.

Illustration 13	g01420764
A scored and spalled bushing

DO NOT USE AGAIN

Note: Bushings shown in Illustrations 12 and 13 were cut in half to allow the condition to be seen.

Illustration 14	g03428828
Damage to the Teflon on the inside diameter of the bushing

DO NOT USE AGAIN

Illustration 15	g03428556
The bushing has turned in the bore.

DO NOT USE AGAIN

Inspect the bushing bore to see if the bore is out of round after the bushing is removed. If the bushing bore is out of round by more than 0.05 mm (0.002 inch), do not use the casting again. A bushing bore that is out of round is an indication that the gear track will be too deep. If the bushing bore is out of round past specifications or the gear track is too deep, the casting must be replaced.

Bushings are installed with the seam in line with the dowel pin holes. The seams should be 180 degrees away from each other.

The installation of new bushings will affect the efficiency of the unit. When installing new bushings, the gears will move to a new position, moving the tips of the gear teeth away from the worn gear track. Pump testing is required after all pump repairs to ensure the correct pump efficiency.

The tooling needed to remove and to install the sleeve bearings is listed in Table 5. Table 5 lists tooling for either a single or tandem version pumps. Using the bearing installer group will leave the bushings extended to the correct depth and properly stake the bushings in place in the pump housing. Refer to Special Instructions, SEHS8428, "Removing and Installing Bushings and Pressure Plates in Hydraulic Gear Pumps" for detailed instructions on removing and installing the bushings.

Table 5

Tooling
Pump Group	Bushing Removal Tool	Pressure Plate Removal GP	Bearing Installer GP
1	4C-9630	-	135-7275
2	8T-9137	8T-0875	8T-0880
3	8T-9128	8T-9134	8T-9133
4	4C-9630	-	135-7275
5	4C-9631	-	130-5946
6	4C-9631	-	130-5946
7	Bushing Block Design
8
9	8T-9137	8T-0875	8T-0880
10	8T-9128	8T-9134	8T-9133
11	8T-9137	8T-0875	8T-0880

Illustration 16	g01420844
Tooling needed for pump repairs. (15) Pressure plate removal group (16) Bushing remover (17) Bearing installer group

Illustration 17	g01508987
Plug Gauge. Dimensions shown are in inches.

Table 6

Plug Gauge Dimensions
Pump and Motor Group Number	Dimension A
9	31.81 mm (1.252 inch)
10	39.70 mm (1.563 inch)
11	31.81 mm (1.252 inch)

Use the plug gauge to verify correct installation of the bushings in the housing. Check for any obstructions in the bore of the bushing. The plug gauge should slide through the bushing easily. If the plug gauge does not slide through the bushing easily, there is a problem. More than likely, the bushings were not staked into place properly. Remove the bushing and install a new bushing. Repeat the process until the plug gauge slides through the bushing easily.

Gear Track

Illustration 18	g03429631
(A) This area is the high-pressure side of the pump. Gear track is not allowed in this area. (B) Maximum area of gear track allowed in the housing. (C) This area is the low-pressure side of the pump. Normal gear track area.

Table 7

Housing Gear Bore Diameter
Pump and Motor Group Number	Maximum Gear Bore Diameter
9	64.92 mm (2.556 inch)
10	80.95 mm (3.187 inch)
11	61.11 mm (2.406 inch)

Illustration 19	g01518591
Iron body normal wear. (18) Suction Port (19) Body Pre -Track (20) Gear Track

USE AGAIN

Note: Body pre-track (19) is from the machining process during manufacturing. Gear track wear (20) is normal after a break-in test is performed.

Normal gear track depth for both aluminum and iron bodies is 0.15 mm (0.006 inch) to 0.20 mm (0.008 inch).

If the gear track wear (20) measures deeper than 0.28 mm (0.011 inch) for iron body pumps or 0.38 mm (0.015 inch) for aluminum body pumps, discard the pump.

Illustration 20	g01420921
Burr on the edge of the gear track.

USE AGAIN

Illustration 21	g01516649
Damage that was caused by foreign material.

USE AGAIN

Erosion or gradual wear on the low-pressure side of the gear track, shown in Illustration 21, will not affect performance. If the erosion or damage has extended to the high-pressure side of the pump, do not reuse the pump. Extended damage will result in a loss in efficiency. The loss in efficiency cannot be determined without testing the pump. Test these castings after assembly to be sure that the level of efficiency is acceptable. Pumps with extended damage toward the high-pressure side will run at a higher noise level.

Seal Groove

Illustration 22	g03428565
Sealant in the seal groove

USE AGAIN

After sealant is removed. Refer to the"Cleaning Procedure"in this document for details.

Illustration 23	g01420927
Damaged seal groove

DO NOT USE AGAIN

Illustration 24	g01420928
Damaged seal face

DO NOT USE AGAIN

Illustration 25	g01420951
Damage across the O-ring seal area of the seal face.

DO NOT USE AGAIN

Note: Similar damage across the O-ring groove can cause leakage, as can tool chatter in the bottom of the O-ring groove. Do not use if the part has either one of these conditions. Refer to Illustration 25

Threads

If the bolt cannot be tightened to the correct torque specifications, the threaded hole is possibly damaged.

Illustration 26	g03428574
Pieces of aluminum in the threads of this bolt are an indication that the threaded hole in the pump is damaged.

USE AGAIN

Use again after all the aluminum is removed with a wire brush.

Illustration 27	g03428598
Threaded hole in the pump body is damaged.

USE AGAIN

Use again after repairing the threads with an insert from 9S-3500 UNF Thread Insert Kit or a 9S-3700 UNC Thread Insert Kit.

Miscellaneous

Illustration 28	g01420956
Side clearance can be felt in the dowel hole.

DO NOT USE AGAIN

Note: Do not reuse mating piece.

Illustration 29	g03428619
Crack in the casting flange

DO NOT USE AGAIN

Illustration 30	g03428623
Crack in the casting flange

DO NOT USE AGAIN

Illustration 31	g03428663
Crack in the casting flange

DO NOT USE AGAIN

Illustration 32	g03428676
Crack in the gear body

DO NOT USE AGAIN

Illustration 33	g01420963
Crack in the seal area of the port.

DO NOT USE AGAIN

Procedure to Salvage Seal Bore

Most of the damage in the pump flange, plate, and body assembly is either acceptable as is or not at all. Generally, if the part is not usable as is, salvage is not practical, except if damage is seal bore damage. Refer to Illustrations 9 and 10.

Note: Follow the manufacturer directions carefully in the use of Loctite products. Refer to Special Publications, PEGJ0075, "Loctite © Cross Reference List for Cat Part Numbers" or http://www.useloctite.com/caterpillar.

Use the following procedure to salvage the seal bores.

1. Remove any raised metal in the bore with 180 grit crocus cloth.
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   Illustration 34	g03428682
   Be sure that the bore is clean and dry.

2. Make sure that the bore is free of oil and dirt. Also make sure that the seal bore is dry. Use cleaner or similar solvent to remove oil. Allow the bore to dry. Refer to Illustration 34.
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   Illustration 35	g01422160

3. When the part is at room temperature 21° C (69.8° F), put a layer of Loctite AC-4368 releasing agent on the outside diameter of the seal cases. Refer to Illustration 35.
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   Illustration 36	g03428693

4. Apply an application of Loctite 97453 on the damaged area. Be careful not to get any Loctite 97453 into the seal drain passage. Refer to Illustration 36.

5. Install the seal in the bore. Do not install the flange assembly for 2 hours.

Gear Shaft

Nomenclature

Illustration 37	g03351437
Gear shaft nomenclature. (21) Tooth profile (22) Tooth face (23) Spline (24) Seal area (25) Bearing areas

Cleaning Procedure

Wash gears with a clean solvent that is made from petroleum. Clean gears carefully to prevent damaging the journal area of the shaft. Removing any discoloration from the gears is not necessary. Oil caused the discoloration and is acceptable.

Inspection Procedure

Shaft Seal Area

Illustration 38	g03395598
Grooves in the seal area can be felt with a fingernail.

USE AGAIN

Use again after the seal area is salvaged according to the correct procedure. Refer to "Procedure to Salvage Shaft Seal Area" in this document for details.

Illustration 39	g03396302
Corrosion in the seal area

USE AGAIN

Use again after the seal area is salvaged according to the correct procedure. Refer to the"Procedure to Salvage Shaft Seal Area"in this document for details.

Illustration 40	g03396311
Splines show signs of interference.

USE AGAIN

Use again after installation of the shaft is adjusted to stop interference.

Note: Do not use a shaft again if the splines are twisted.

Illustration 41	g03396312
Fretting in the splines can be felt with a fingernail.

DO NOT USE AGAIN

Illustration 42	g03396313
Light spline damage

USE AGAIN

Illustration 43	g03396314
Heavy spline damage

DO NOT USE AGAIN

Journal Area

Illustration 44	g03428697
Journal area shows wear caused by contaminants.

USE AGAIN

Use again after scratches are removed with 400 grit crocus cloth and motor oil.

Note: Caterpillar does not recommend reconditioning or the use of flame spray around the journal area of the shaft.

Illustration 45	g03428717
Corrosion in the journal area and tooth face.

USE AGAIN

Use again after scratches are removed with 400 grit crocus cloth and motor oil.

Note: If corrosion has caused pitting in the shaft, do not use the part again.

When reconditioning the bearing, install the bearing in a lathe for operation. Use a flat file behind the crocus cloth to polish bearing and tooth face areas. Refer to Illustrations 44 and 45.

Tooth Face

Illustration 46	g01510356
Scratches on the face of the gear tooth.

Illustration 47	g01510357

USE AGAIN

Use the shaft again after most of the scratches and all the burrs are removed with 400 grit crocus cloth and motor oil. Install the shaft in a lathe for the correct procedure. Use a flat file behind a piece of crocus cloth to polish tooth face area.

Note: The area between the journal and the tooth face valley must not contain any scratches. Refer to Illustration 47.

Tooth Profile

Illustration 48	g01421004
Heavy damage on tooth profile

DO NOT USE AGAIN

Illustration 49	g01516677
Lip on trailing edge of tooth profile

USE AGAIN

Note: The lip on the edge of the tooth tip was caused by the break-in test. The lip is normal with iron housing pumps. Aluminum housing pumps will not cause this type of wear because aluminum will yield to the hardness of the tooth tip. The next three images all show normal tooth tip wear on iron housing pumps.

Illustration 50	g01516695
A lip on the trailing edge of the tooth. Normal wear for iron body pumps.

USE AGAIN

Illustration 51	g01516700
Rough tooth tip edge

USE AGAIN

Note: The rippled look of the tooth tip is normal in iron housing pumps. This rippled look is caused by tooth tip contact with the bore of the iron housing.

Illustration 52	g01516706
Rough tooth tip edge and a lip on the trailing edge of tooth tip.

USE AGAIN

Note: Illustration 52 shows the rippled look on the tooth tip and the lip. This look is caused by contact between the tooth tip and the bore of iron housing pumps.

Illustration 53	g01421044
(26) Tooth tip wear

USE AGAIN

Use again if material wear from tooth tip is less than 0.25 mm (0.01 inch).

Note: Significant tooth tip wear only occurs in iron body pumps.

Table 8

Minimum Allowable Diameter for Gear Tips
Pump and Motor Group Number	New Diameter	Min. Diameter Allowed
9	64.59 mm (2.543 inch)	64.36 mm (2.534 inch)
10	80.87 mm (3.184 inch)	80.64 mm (3.175 inch)
11	60.96 mm (2.400 inch)	60.93 mm (2.399 inch)

Illustration 54	g01421091
Light wear on tooth profile

USE AGAIN

Illustration 55	g01421093
Heavy wear on tooth profile

DO NOT USE AGAIN

Illustration 56	g01516712
The profile of the gear teeth shows heavy wear.

DO NOT USE AGAIN

Shaft

Illustration 57	g01516777
Light damage to the end of the shaft

USE AGAIN

Procedure to Salvage Shaft Seal Area

Grooves in the seal area that can be felt with a fingernail can be removed to make the part usable again.

Note: Follow the Flame Spray manufacturer directions carefully in the application of Flame Spray to the shaft seal area. Refer to "Pump and Motor Identification Chart" in this document for details. Refer to Illustration 58.

The procedure to salvage shaft seal area is as follows:

1. Measure the shaft outside diameter at the seal area and the shoulder diameter (if present). Make a note of each dimension.

2. For the correct Flame Spray procedures refer to Special Instructions, SEBF9240, "Fundamentals of Flame Spray for Reconditioning Components".

3. Grind the seal area to the diameter measured in Step 1 to within 0.05 mm (0.002 inch) of the original measurement. The surface finish must be 0.40 to 0.80µm (16µ to 32 µin.). The wheel radius must be the same or greater than the shoulder radius measured in Step 1.

Illustration 58	g01516780
The seal area has been flame sprayed.

Pressure Plate

Nomenclature

Illustration 59	g03177857
Pressure plate nomenclature. See Table 9 for dimensions. (27) Bronze face (28) Bearing bore diameter

Cleaning Procedure

Wash pressure plates with clean solvent made from petroleum. Be careful not to damage the bronze face during the procedure. Removing oil discoloration is not necessary. Remove carbon deposits with the 6V-6050 Ultrasonic Cleaner Group.

Inspection Procedure

Table 9

Pressure Plate Measurements
Pump and Motor Group Number	Minimum Pressure Plate Thickness
9	6.70 mm (0.264 inch)
10	7.92 mm (0.312 inch)
11	6.70 mm (0.264 inch)

Illustration 60	g03396331
Carbon deposits on the bronze face

USE AGAIN

Use again after the carbon is removed by ultrasonic cleaning and if the plate is not bent. See Illustration 61. Refer to Table 9 for Specifications.

Small surface marks on the bronze face can be removed by a procedure known as "touch lapping". To touch lap, cover surface plate 7B-0337 Surface Plate with 180 grit crocus cloth. Wet the cloth thoroughly with clean solvent (made from petroleum). Take the part to be touch lapped and put the part on the wet cloth with the surface to be touch lapped toward the cloth. Move the part in the shape of the number "8". When the procedure is finished, wash the part in clean solvent and allow to dry at room temperature.

Illustration 61	g01421104
Measure pressure plate flatness

Note: To see if the plates are flat, hold the plates with bronze surfaces turned toward each other. If a 0.18 mm (0.007 inch) feeler gauge fits between the plates, the plates are too bent and no longer acceptable.

Illustration 62	g03396335
Scratches in the pressure plate

USE AGAIN

Illustration 63	g01421106
Step in the pressure plate

USE AGAIN

Use again if the step can be removed by touch lapping. Refer to Table 9 for Specifications.

Illustration 64	g01516920
The erosion is near the pressure equalization chamfer.

USE AGAIN

Illustration 65	g01421108
Smearing on the bronze face

DO NOT USE AGAIN

Illustration 66	g01421110
Pitting on the pressure plate.

USE AGAIN

Use again if the plate has an acceptable thickness. Refer to Table 9.

Miscellaneous Parts

Cleaning Procedure

Clean miscellaneous parts, such as bushing supports, couplings, isolation plates, and support rings with clean solvent made from petroleum.

Note: Never use seals again. Always use new seals.

Inspection Procedure

Illustration 67	g01422223
Damaged coupling

USE AGAIN

Use again if more than 75 percent of the length of each spline is still in acceptable condition.

Illustration 68	g01421113
Tip of isolation plate is broken off.

DO NOT USE AGAIN

Illustration 69	g01421114
Isolation plate damaged during assembly.

DO NOT USE AGAIN

Test Procedure

For the correct break-in procedure, refer to Bench Test Procedure, REHS1832, "Bench Test Procedure for Gear Pumps"for gear pumps.