This document provides instructions for disassembling the piston pump of a 904B compact wheel loader. It describes 33 steps to disassemble the various components of the pump, including removing plates, shafts, seals, springs, valves, and more. Safety precautions are provided regarding the risks of hydraulic pressure, releasing spring forces, and ensuring cleanliness during disassembly and reassembly. Tools required for the disassembly process are also listed.
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𝘼𝙣𝙩𝙞𝙦𝙪𝙚 𝙋𝙡𝙖𝙨𝙩𝙞𝙘 𝙏𝙧𝙖𝙙𝙚𝙧𝙨 𝙞𝙨 𝙫𝙚𝙧𝙮 𝙛𝙖𝙢𝙤𝙪𝙨 𝙛𝙤𝙧 𝙢𝙖𝙣𝙪𝙛𝙖𝙘𝙩𝙪𝙧𝙞𝙣𝙜 𝙩𝙝𝙚𝙞𝙧 𝙥𝙧𝙤𝙙𝙪𝙘𝙩𝙨. 𝙒𝙚 𝙝𝙖𝙫𝙚 𝙖𝙡𝙡 𝙩𝙝𝙚 𝙥𝙡𝙖𝙨𝙩𝙞𝙘 𝙜𝙧𝙖𝙣𝙪𝙡𝙚𝙨 𝙪𝙨𝙚𝙙 𝙞𝙣 𝙖𝙪𝙩𝙤𝙢𝙤𝙩𝙞𝙫𝙚 𝙖𝙣𝙙 𝙖𝙪𝙩𝙤 𝙥𝙖𝙧𝙩𝙨 𝙖𝙣𝙙 𝙖𝙡𝙡 𝙩𝙝𝙚 𝙛𝙖𝙢𝙤𝙪𝙨 𝙘𝙤𝙢𝙥𝙖𝙣𝙞𝙚𝙨 𝙗𝙪𝙮 𝙩𝙝𝙚 𝙜𝙧𝙖𝙣𝙪𝙡𝙚𝙨 𝙛𝙧𝙤𝙢 𝙪𝙨.
Over the 10 years, we have gained a strong foothold in the market due to our range's high quality, competitive prices, and time-lined delivery schedules.
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2. Shutdown SIS
Previous Screen
Product: COMPACT WHEEL LOADER
Model: 904B COMPACT WHEEL LOADER B4L
Configuration: 904B Compact Wheel Loader B4L00001-UP (MACHINE) POWERED BY S4Q2T Engine
Disassembly and Assembly
904B Wheel LoaderPower Train
Media Number -RENR9758-00 Publication Date -01/06/2005 Date Updated -23/06/2005
i02338391
Piston Pump (Hydrostatic) - Remove
SMCS - 3203-011
Removal Procedure
Table 1
Tool Part Number Description Quantity
A 140-7742 Sleeve 1
B
1U-9200 Ratchet 1
189-0410 Shackle 1
C 242-6163 Wrench 1
Start By:
A. Remove the seat. Refer to Disassembly and Assembly, "Seat - Remove".
B. Remove the gear pump. Refer to Disassembly and Assembly, "Gear Pump - Remove".
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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3. NOTICE
Care must be taken to ensure that fluids are contained during
performance of inspection, maintenance, testing, adjusting and repair
of the machine. Be prepared to collect the fluid with suitable containers
before opening any compartment or disassembling any component
containing fluids.
Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop
Products Guide", for tools and supplies suitable to collect and contain
fluids in Caterpillar machines.
Dispose of all fluids according to local regulations and mandates.
Note: Put identification marks on all lines, on all hoses, on all wires, and on all tubes for
installation purposes. Plug all lines, all hoses and all tubes. This helps to prevent fluid loss and this
helps to keep contaminants from entering the system.
Illustration 1 g01167299
1. Remove plate (1) .
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5. Illustration 4 g01167336
4. Disconnect hose assemblies (6) and (7) from piston pump (5) .
Illustration 5 g01167337
5. Disconnect hose assemblies (8) and (9) from piston pump (5) .
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6. Illustration 6 g01167341
6. Disconnect cable assembly (10) from piston pump (5). Disconnect hose assembly (11) from
piston pump (5) .
Illustration 7 g01167425
7. Disconnect hose assembly (12) from the bottom of piston pump (5) .
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7. Illustration 8 g01167342
Illustration 9 g01167431
8. Attach Tooling (A) and Tooling (B) to the cab.
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8. Illustration 10 g01167343
9. Attach Tooling (B) and a suitable lifting device to piston pump (5) .
Illustration 11 g01167344
10. Use Tooling (C) in order to remove mounting bolts (13) from piston pump (5) and mounting
flange (14) .
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9. Illustration 12 g01167346
11. Raise piston pump (5) in order to remove the pump from the machine. The weight of piston
pump (5) is approximately 45 kg (100 lb).
Copyright 1993 - 2019 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
Sat Aug 31 22:53:44 UTC+0800 2019
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10. Shutdown SIS
Previous Screen
Product: COMPACT WHEEL LOADER
Model: 904B COMPACT WHEEL LOADER B4L
Configuration: 904B Compact Wheel Loader B4L00001-UP (MACHINE) POWERED BY S4Q2T Engine
Disassembly and Assembly
904B Wheel LoaderPower Train
Media Number -RENR9758-00 Publication Date -01/06/2005 Date Updated -23/06/2005
i02327908
Piston Pump (Hydrostatic) - Disassemble
SMCS - 3203-015
Disassembly Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 1P-0510 Driver Group 1
B 1P-1861 Retaining Ring Pliers 1
C 5P-4758 Internal Pliers 1
D 1U-7600 Slide Hammer Puller 1
E 1P-1859 Retaining Ring Pliers 1
F 1P-1857 Retaining Ring Pliers 1
G 1S-4208 Spanner Wrench 1
Start By:
A. Remove the hydraulic drive pump. Refer to Disassembly and Assembly, "Hydraulic Drive
Pump - Remove".
Personal injury can result from hydraulic oil pressure and hot oil.
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11. 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 work tools have been lowered to the ground, and
the 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.
Note: Cleanliness is an important factor. Before the disassembly procedure, the exterior of the
component should be thoroughly cleaned. This will help to prevent dirt from entering the internal
mechanism. Dirt and contaminants can damage the components of the pump or the motor. All
disassembly and assembly procedures must be performed on a clean work surface. Clean all the
interior components in clean solvent. Dry all the interior components with compressed air. Plug
ports and plug hoses on the machine during repair.
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, NENG2500, "Caterpillar Tools and Shop
Products Guide" for tools and supplies suitable to collect and contain
fluids on Caterpillar products.
Dispose of all fluids according to local regulations and mandates.
Illustration 1 g00775547
1. Remove bolts (1) and remove charge pump (2) .
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12. Illustration 2 g00716074
Note: Mark the location of the charge pump on the head assembly. Crescent (M) of gear set
(4) must face toward the valves for installation purposes. The valves are indicated by
arrows.
2. Remove O-ring seal (3). Remove gear set (4). Keep the gear set together in order to ensure
proper installation of the gear set.
Illustration 3 g00580966
3. Remove bushing (5). Note the orientation of the bushing. The bushing must be installed in
the original location.
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13. Illustration 4 g00580969
4. Remove plate (6). Note the position of the plate.
Illustration 5 g00580995
5. Remove shaft (7) and O-ring seal (8) .
Illustration 6 g00581004
6. Remove retaining ring (9) and key (10) from the shaft.
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14. Illustration 7 g00581009
7. Remove bolts (11) and head assembly (12) .
Illustration 8 g00581016
8. Remove O-ring seals (13) and (14) from the head.
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15. Illustration 9 g00581023
Illustration 10 g00581022
9. Use Tooling (A) in order to remove bushing (15) .
Illustration 11 g00581027
10. Remove bushing (16) .
Note: Mark orientation of groove in bushing (16) for later installation of new bushing into
the original location.
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16. Illustration 12 g00794209
Note: Mark the position of the port plate for installation purposes. The groove in the port
plate must face the two valves on the head assembly.
11. Remove port plate (17) and bearing (18), if necessary.
Note: Perform Steps 12 and 13, if equipped.
Illustration 13 g00794067
12. Remove plug assembly (19) from the head.
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17. Illustration 14 g00794187
13. Disassemble the plug assembly, as follows: O-ring seal (20), O-ring seal (21) and locking
plug (22) .
Illustration 15 g00722813
14. Remove valve (23) from the head.
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18. Illustration 16 g00581200
15. Disassemble the valve, as follows: O-ring seal (26), backup ring (25) and O-ring seal (24) .
Illustration 17 g00581207
16. Remove valve (27) from the head. Refer to Step 15 for the disassembly procedure.
Illustration 18 g01162895
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20. Illustration 22 g01162976
Personal injury can result from being struck by parts propelled by a
released spring force.
Make sure to wear all necessary protective equipment.
Follow the recommended procedure and use all recommended tooling to
release the spring force.
19. Remove cartridge (33), cartridge (35), and gasket (34) .
20. Remove springs (36), retainers (37), and spool (39) from housing (38) .
21. Remove O-ring seal (40) .
Illustration 23 g00581734
22. Remove barrel assembly (41) from the pump housing. Keep the barrel assembly together
with the pistons.
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21. Illustration 24 g00581740
23. Mark the location of the pistons in the barrel assembly. Remove pistons and plate (42) from
the barrel assembly.
Illustration 25 g00581773
24. Remove spring retainer (43) .
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22. Illustration 26 g00581780
Personal injury can result from being struck by parts propelled by a
released spring force.
Make sure to wear all necessary protective equipment.
Follow the recommended procedure and use all recommended tooling to
release the spring force.
25. Remove shim (44) and springs (45). Note the position of the springs. The springs must be
installed in the same position for proper clearance.
Illustration 27 g00581784
Personal injury can result from being struck by parts propelled by a
released spring force.
Make sure to wear all necessary protective equipment.
Follow the recommended procedure and use all recommended tooling to
release the spring force.
26. Use a suitable press and Tooling (B) in order to remove retaining ring (46) .
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23. Illustration 28 g00581786
27. Remove washer (47), spring (48), and washer (47) from the barrel assembly.
Illustration 29 g00581792
28. Use Tooling (C) in order to remove retaining ring (49) .
Illustration 30 g00581821
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24. 29. Use Tooling (D) in order to remove seal (50) .
Illustration 31 g00581830
30. Use Tooling (C) in order to remove retaining ring (51) .
Illustration 32 g00581848
Illustration 33 g00581850
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25. 31. Remove shaft (52). It may be necessary to use a soft faced hammer in order to remove the
shaft.
Illustration 34 g00581928
32. Use Tooling (E) in order to remove retaining ring (53) .
Illustration 35 g00581934
33. Use a suitable press in order to remove shaft (52) from bearing (54) .
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26. Illustration 36 g00581942
34. Remove swashplate assembly (55) .
Illustration 37 g00581947
35. Remove plate (56) from the swashplate. Remove rods (57) from the swashplate.
Illustration 38 g00582435
36. Remove bearings (58) .
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27. Thank you very much for
your reading. Please Click
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28. Illustration 39 g01164798
37. Remove bearing cradles (59) .
Illustration 40 g00720021
38. Remove plug (61) and retainer (60) on both sides of the pump housing.
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30. Illustration 44 g00582504
41. Remove O-ring seal (67) from the cover.
Illustration 45 g00794220
42. Remove nut (68). Unscrew the cover from the valve assembly.
Illustration 46 g00794221
43. Remove O-ring seal (69) .
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31. Illustration 47 g00794223
Ring (71) is on the opposite end.
44. Remove O-ring seal (72), and rings (70) and (71) from each side.
Illustration 48 g00582619
Personal injury can result from parts and/or covers under spring
pressure.
Spring force will be released when covers are removed.
Be prepared to hold spring loaded covers as the bolts are loosened.
45. Use a suitable press to relieve the pressure on the spring. Use Tooling (F) in order to remove
retaining ring (73) .
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