This document provides instructions for disassembling a piston pump for a Caterpillar 226B3 skid steer loader for cleaning purposes. It lists 71 steps and required tools to remove components like fittings, springs, seals, bearings, and plates. Measurements are taken during removal to aid reassembly. Parts are marked to ensure correct installation.
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2. Shutdown SIS
Previous Screen
Product: SKID STEER LOADER
Model: 226B3 SKID STEER LOADER MWD
Configuration: 226B3 Skid Steer Loader MWD00001-UP (MACHINE) POWERED BY C2.2 Engine
Disassembly and Assembly
259B3 Compact Track Loader, 247B3 and 257B3 Multi Terrain Loaders and 216B3,
226B3, 236B3, 242B3 and 252B3 Skid Steer Loaders Power Train
Media Number -UENR0251-07 Publication Date -01/07/2018 Date Updated -11/07/2018
i02358306
Piston Pump (Hydrostatic) - Disassemble
SMCS - 5070-015-H7
Disassembly Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 9U-7289 Ruler 1
B 1P-1861 Retaining Ring Pliers 1
C 138-7576 Link Brackets 2
D 8T-4956 Bolts (M12 - 1.75 - 35 MM) 2
E 8T-4223 Hard Washers (13.5 - 25.5 - 3 MM THK) 2
F 1P-0510 Driver Gp 1
G 1P-1854 Retaining Ring Pliers 1
H 1U-7600 Slide Hammer Puller Gp 1
J 1P-1860 Retaining Ring Pliers 1
K 8H-0663 Bearing Puller Gp 1
Start By:
a. Remove the piston pump. Refer to Disassembly and Assembly, "Piston Pump - Remove".
Note: The following procedure is intended for cleaning purposes only.
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3. Illustration 1 g00903455
1. Remove the fittings and connectors (1).
2. Remove speed sensing valve (2).
Illustration 2 g00903457
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.
3. Remove cover (3) and the spring for the crossover relief valve.
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4. Illustration 3 g00903461
Illustration 4 g00903467
4. Remove seat (4).
5. Note the orientation of spring (5).
6. Remove O-ring seal (6) from cover (3).
7. Remove back up ring (7) from cover (3).
8. Repeat Step 3 through Step 7 for the other covers.
Illustration 5 g00903500
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5. 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.
9. Remove plug (8) for the charge relief valve.
Illustration 6 g00903502
Illustration 7 g00903503
10. Remove seat (9).
11. Remove shims (12).
12. Remove spring (13).
13. Remove seal (11) from plug (8).
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6. 14. Remove O-ring seal (10) from plug (8).
Illustration 8 g01178122
15. Use Tooling (A) to measure the distance from the stud to the nut. Record the distance for
assembly purposes.
Illustration 9 g00904929
16. Remove screws (14).
17. Remove nut (15).
18. Remove cover (16).
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7. Illustration 10 g00904930
19. Remove O-ring seal (17) from cover (16).
Illustration 11 g00904933
20. Use Tooling (B) to remove retaining ring (18). Remove actuator assembly (19).
Illustration 12 g00905018
21. Remove O-ring seal (20) from actuator assembly (19).
Illustration 13 g01054368
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8. 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.
Illustration 14 g01054370
Note: Keepers (21) must be marked for assembly. Do not mix keepers (21). The keepers are
not interchangeable.
22. Place actuator assembly (19) in a suitable press.
23. Remove keepers (21).
24. Remove shaft (26).
25. Remove spring retainer (22).
26. Remove spring (23).
27. Remove spring retainer (24).
28. Remove spacer (25).
29. Repeat Step 15 through Step 28 for the other cover.
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9. Illustration 15 g01178123
30. Remove caps (27).
31. Remove connectors (28).
32. Remove fitting (29).
33. Remove adapter (30).
Illustration 16 g00905035
Note: Mark the location of the notch in stud (31) by making a corresponding mark on the
housing for installation purposes.
34. Use Tooling (A) to measure the distance from stud (31) to nut (32). Record the distance for
assembly purposes.
35. Remove stud (31) and nut (32).
36. Repeat Step 34 and Step 35 for the other stud.
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10. Illustration 17 g01178125
37. Remove connector (33).
38. Remove caps (34).
39. Remove fittings (35).
Illustration 18 g00905224
40. Use Tooling (A) to measure the distance from studs (36) to nuts (37). Record the distance
for assembly purposes.
41. Remove studs (36) and nuts (37).
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11. Illustration 19 g01178127
42. Remove bolts (38) from cover (39).
Illustration 20 g00973868
43. Use a suitable lifting device, Tooling (C), Tooling (D), and Tooling (E) to raise the piston
pump housing.
Illustration 21 g01178130
Note: Mark the port plates for assembly. Port plates are not interchangeable.
44. Remove port plate (40).
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12. Illustration 22 g01178131
45. Remove plug (41) and the O-ring seal.
Illustration 23 g01178132
46. Remove slotted pin (42).
47. Repeat Step 45 and Step 46 for the other side.
Illustration 24 g01178133
48. Remove the rotating assembly and swashplate (43).
49. Remove linkage (44).
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13. Illustration 25 g01178135
50. Remove bearing assemblies (45) and (46).
51. Remove swashplate (47).
Illustration 26 g01178137
Note: Mark the reaction plate assembly and the barrel.
52. Remove reaction plate assembly (48) from barrel (49).
Illustration 27 g00905445
53. Remove the retainer and shims (51) from barrel (50).
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14. Illustration 28 g00973870
Illustration 29 g00905448
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.
54. Place barrel (50) in a suitable press.
55. Use Tooling (F) and Tooling (G) to remove retaining ring (52) and spring (55).
56. Remove washer (54).
57. Remove pins (53).
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15. Illustration 30 g00905648
58. Remove bearing races (56) from pins (57).
Illustration 31 g00905650
59. Remove O-ring seal (58).
60. Inspect dowel (59) for damage.
Illustration 32 g00905577
61. Use Tooling (B) to remove retaining ring (60).
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16. Illustration 33 g00973871
62. Use Tooling (H) to remove seal (61).
Illustration 34 g00905582
63. Use Tooling (B) to remove retaining ring (62).
Illustration 35 g00905653
64. Remove shaft (63).
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17. Illustration 36 g00973872
65. Use Tooling (J) to remove retaining ring (64).
Illustration 37 g00973873
66. Use a suitable press and Tooling (K) to remove bearing (65).
Illustration 38 g00906134
67. Remove bearing (66).
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18. Illustration 39 g00906511
68. Remove actuator (67).
Illustration 40 g00906515
69. Remove seal (68).
70. Remove liner (69).
71. Repeat Step 42 through Step 70 for the other end of the piston pump.
Copyright 1993 - 2019 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
Mon Oct 14 13:01:53 UTC+0800 2019
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19. Shutdown SIS
Previous Screen
Product: SKID STEER LOADER
Model: 226B3 SKID STEER LOADER MWD
Configuration: 226B3 Skid Steer Loader MWD00001-UP (MACHINE) POWERED BY C2.2 Engine
Disassembly and Assembly
259B3 Compact Track Loader, 247B3 and 257B3 Multi Terrain Loaders and 216B3,
226B3, 236B3, 242B3 and 252B3 Skid Steer Loaders Power Train
Media Number -UENR0251-07 Publication Date -01/07/2018 Date Updated -11/07/2018
i02362815
Piston Pump (Hydrostatic) - Assemble
SMCS - 5070-016-H7
Assembly Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 9U-7289 Ruler 1
B 1P-1861 Retaining Ring Pliers 1
F 1P-0510 Driver Gp 1
G 1P-1854 Retaining Ring Pliers 1
J 1P-1860 Retaining Ring Pliers 1
K 8H-0663 Bearing Puller Gp 1
L 2P-8301 Seal Guide 1
M 6V-2055 Grease 1
N 1U-6395 Grease 1
P 9S-3263 Thread Lock Compound 1
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21. Illustration 4 g00906130
5. Raise the temperature of bearing (65).
6. Use a suitable press and Tooling (K) to install bearing (65).
Illustration 5 g00905698
7. Use Tooling (J) to install retaining ring (64).
Illustration 6 g00905653
8. Install shaft (63).
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22. Suggest:
If the above button click is invalid.
Please download this document
first, and then click the above link
to download the complete manual.
Thank you so much for reading
23. Illustration 7 g00905582
9. Use Tooling (B) to install retaining ring (62).
Illustration 8 g00905650
10. Dowel (59) must be aligned with the piston pump housing during assembly.
11. Install O-ring seal (58).
Illustration 9 g00905648
12. Install bearing races (56) on pins (57).
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