2. Shutdown SIS
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Product: WHEEL LOADER
Model: 938G II WHEEL LOADER CRD
Configuration: 938G II Wheel Loader CRD00001-UP (MACHINE) POWERED BY 3126B Engine
Disassembly and Assembly
938G Series II Wheel Loader and IT38G Series II Integrated Toolcarrier Power
Train
Media Number -RENR6068-03 Publication Date -01/12/2008 Date Updated -19/12/2008
i01879674
Transmission - Disassemble
SMCS - 3030-015
Disassembly Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 138-7573 Link Bracket 1
B
3H-0465 Push-Puller Plate 4
5F-7344 Puller Block 1
5P-8715 Forcing Bolt 1
8B-7550 Push-Puller Leg 2
8H-0663 Bearing Puller Gp 1
C 1P-2420 Transmission Repair Stand 1
D 2P-8312 Retaining Ring Pliers 1
E 8S-2328 Dial Indicator Gp 1
F 9U-7480 Compressing Tube 1
G 1P-1863 Retaining Ring Pliers 1
H 9U-7479 Compressing Tube 1
J 1U-6341 Threaded Rod 1
K 5P-7970 Nut 1
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3. L 154-6182 Forcing Bolt 1
Start By:
A. Separate the transmission from the torque converter. Refer to Disassembly and Assembly,
"Transmission and Torque Converter - Separate".
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.
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.
Note: Put identification marks on all sections of the transmission for assembly purposes.
Illustration 1 g00984312
1. Install Tooling (A) to shaft (1). Attach a suitable lifting device to Tooling (A) .
Note: Hold input shaft (2) away from shaft (1) for clearance.
2. Use a suitable lifting device to lift shaft (1) straight up out of transmission case. The weight
of shaft (1) is approximately 50 kg (110 lb).
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4. Illustration 2 g00961151
3. Position shaft (1) on Tooling (C), as shown.
Illustration 3 g00961189
4. Use Tooling (D) to remove retaining ring (3) and remove thrust disc (4) .
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5. Illustration 4 g00961435
5. Remove gear and hub assembly (5) .
Illustration 5 g00961444
6. Use Tooling (G) to remove retaining ring (6) .
7. Separate hub (7) from gear (5). If necessary, remove sleeve bearing (8) .
Illustration 6 g00961455
8. Remove thrust disc (9) and retainer (10) .
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6. Illustration 7 g00961468
9. Use Tooling (D) to remove retaining ring (11) .
Illustration 8 g00961492
10. Use a screwdriver to remove retaining ring (12) .
Illustration 9 g00961507
11. Remove one end plate (13), clutch plates (14), and friction discs (15) .
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7. Illustration 10 g00961630
12. End plate (13), clutch plates (14), and friction plates (15) .
Illustration 11 g00961639
13. Position the shaft assembly with retaining ring (16) in line with the opening in Tooling (F) .
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8. Illustration 12 g00961647
14. Install Tooling (F), Tooling (J), and Tooling (K) in order to compress the wave spring. The
wave spring is not shown. Use Tooling (D) to remove retaining ring (16). Remove Tooling
(F) .
Illustration 13 g00961656
15. Remove balance seal assembly (17) .
Illustration 14 g00961678
16. Remove wave spring (18) .
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9. Illustration 15 g00974947
17. Remove piston assembly (19) .
Illustration 16 g00974948
18. Balance seal assembly (17). Wave spring (18) will be removed with piston (19). Check the
lips on the seals for damage or wear. Replace the seals if it is necessary.
Illustration 17 g00974949
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10. 19. Reposition the shaft assembly, as shown. Remove three seal rings (20). Use Tooling (D) to
remove retaining ring (21) .
Illustration 18 g00974950
20. Remove thrust disc (22) .
Illustration 19 g00974951
21. Remove washer (23) and gear (24) .
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12. 24. Use Tooling (G) to remove retaining ring (28). Separate gear (27) from hub assembly (29).
If necessary, remove sleeve bearing (30) .
Illustration 23 g00974956
25. Remove thrust disc (31) and retainer (32) .
Illustration 24 g00974957
26. Use Tooling (D) to remove retaining ring (33) .
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13. Illustration 25 g00974958
27. Use a screwdriver to remove retaining ring (34) .
Illustration 26 g00974959
28. Remove one end plate (35), clutch plates (36), and friction discs (37) .
Illustration 27 g00974960
29. Exploded view of end plate (35), clutch plates (36), and friction discs (37) upon removal.
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14. Illustration 28 g00974961
Illustration 29 g00974962
30. Position the shaft assembly with the opening in retaining ring (38) in line with the opening
in Tooling (F) .
31. Install Tooling (F), Tooling (J), and Tooling (K) in order to compress the wave spring. The
wave spring is not shown.
32. Use Tooling (D) to remove retaining ring (38) and remove Tooling (F) .
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15. Illustration 30 g00974963
33. Remove balance seal assembly (39) .
Illustration 31 g00974964
34. Remove wave spring (40) .
Illustration 32 g00974965
35. Remove piston seal (41) .
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16. Illustration 33 g00988356
36. Remove seal rings (41A) and (41B) from piston (41). Replace the seals, if necessary.
Illustration 34 g00974967
37. Use Tooling (A) and a suitable lifting device in order to remove shaft assembly (42). The
weight of shaft assembly is approximately 41 kg (90 lb).
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17. Illustration 35 g00975447
38. Position shaft (42) on Tooling (C), as shown.
Illustration 36 g00975449
39. Use Tooling (D) to remove retaining ring (43) and remove thrust disc (44) .
Illustration 37 g00975452
40. Remove gear and hub assembly (45) .
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18. Illustration 38 g00975454
41. Use Tooling (G) to remove retaining ring (46). Separate gear (45) from hub assembly (47).
Remove sleeve bearing (48), if necessary.
Illustration 39 g00975456
42. Remove thrust disc (49) and retainer (50) .
Illustration 40 g00975458
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19. 43. Use Tooling (D) to remove retaining ring (51) .
Illustration 41 g00975463
44. Use a screwdriver to remove retaining ring (52) .
Illustration 42 g00975467
45. Remove one end plate (53), clutch plates (54), and friction discs (55) .
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20. Illustration 43 g00975553
46. Position the shaft so the opening in retaining ring (56) will line up with the opening in
Tooling (F) .
Illustration 44 g00975555
47. Install Tooling (F), Tooling (J), and Tooling (K) in order to compress the wave spring. Use
Tooling (D) to remove the retaining ring (56). Remove Tooling (F) .
Illustration 45 g00975558
48. Remove balance seal assembly (57) .
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21. Illustration 46 g00975562
49. Remove wave spring (58) .
Illustration 47 g00975564
50. Remove piston assembly (59) .
Illustration 48 g00988355
51. Remove seal rings (59A), and (59B) from piston (59). Replace the seals if it is necessary.
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22. Illustration 49 g00975570
52. Position the shaft assembly with the opposite end upward, as shown. Remove three seal
rings (60). Use Tooling (D) to remove retaining ring (61) .
Illustration 50 g00975576
53. Remove thrust disc (62) and gear assembly (63) .
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23. Illustration 51 g00975578
54. Remove two sleeve bearings (64), if necessary.
Illustration 52 g00975579
55. Remove thrust disc (65) and retainer (66) .
Illustration 53 g00975584
56. Use Tooling (D) to remove retaining ring (67). Use a screwdriver to remove retaining ring
(68) .
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25. Illustration 54 g00975585
57. Remove one end plate (69), clutch plates (70), and friction discs (71) .
Illustration 55 g00975587
58. End plate (69), clutch plates (70), and friction discs (71) upon removal.
Illustration 56 g00975588
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26. 59. Position the shaft assembly so the opening in retaining ring (72) will be in line with the
opening in Tooling (F) .
Illustration 57 g00975810
60. Install Tooling (F), Tooling (J), and Tooling (K) in order to compress the wave spring. The
wave spring is not shown. Use Tooling (G) to remove retaining ring (72). Remove Tooling
(F) .
Illustration 58 g00975811
61. Remove balance seal assembly (73) .
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27. Illustration 59 g00975812
62. Remove wave spring (74) .
Illustration 60 g00975818
63. Remove piston seal (75) .
Illustration 61 g00988354
64. Remove seal rings (76) and (77) from piston (75). Replace the seals if it is necessary.
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