This document provides disassembly instructions for the transmission planetary system of a 972G wheel loader. It outlines 67 steps to fully disassemble the transmission, including removing gears, shafts, housings, seals, and other components. Special tools and lifting devices are required due to the heavy weight of some parts. Cautions are provided regarding spring forces and keeping parts clean.
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2. Shutdown SIS
Previous Screen
Product: WHEEL LOADER
Model: 972G WHEEL LOADER 6AW
Configuration: 972G Wheel Loader 6AW00001-UP (MACHINE) POWERED BY 3306 Engine
Disassembly and Assembly
966G and 972G Wheel Loaders Power Train
Media Number -RENR2106-08 Publication Date -01/05/2004 Date Updated -28/05/2004
i02299775
Transmission Planetary - Disassemble
SMCS - 3160-015
Disassembly Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 138-7575 Link Bracket 3
B 1P-0520 Driver Gp 1
C 8H-0663 Bearing Puller 1
Start By:
A. Separate the transmission from the output transfer gears. Refer to Disassembly and
Assembly, "Transmission from Output Transfer Gears - Separate".
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 lines, on all hoses, on all wires, and on all tubes for
installation purposes. Plug all lines, hoses, and tubes. This helps to prevent fluid loss and this
helps to keep contaminants from entering the system.
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3. Illustration 1 g00458960
1. Remove O-ring seal (1) from the housing.
2. Remove bolt (3), retainer (2), and drive gear (4) from the end of the input shaft.
Illustration 2 g00459007
3. Remove plate (5) .
Illustration 3 g00459030
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4. 4. Attach Tooling (A) and a suitable lifting device to the transmission, as shown. The weight
of the transmission is approximately 544 kg (1200 lb).
5. Carefully position the planetary group on the opposite end so that No. 6 clutch housing (6)
is facing upward, as shown.
Illustration 4 g00459073
6. Remove retaining ring (8) from output shaft (7) .
Illustration 5 g00459075
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.
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5. 7. Remove bolts (9) and No. 6 clutch housing (6). Mark the location of the long bolts.
Illustration 6 g00459079
8. Remove clutch piston (10) from No. 6 clutch housing (6) .
9. Remove seal rings (11) and (12) from clutch piston (10) .
Illustration 7 g00459087
10. Remove clutch plate (14) and springs (13) .
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7. Illustration 11 g00459138
14. Remove metal seal ring (20) from carrier assembly (19) .
Illustration 12 g00459150
15. Use a hammer and a punch to push the spring pins through carrier assembly (19) and into
planetary shafts (21) .
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8. Illustration 13 g00459151
16. Use a hammer and a punch to remove planetary shafts (21) from carrier assembly (19) .
Illustration 14 g00324725
17. Remove thrust discs (22), planetary gears (23), and bearings (24) from the carrier assembly.
Remove spring pins (25) from planetary shafts (21) .
Illustration 15 g00459161
18. Remove O-ring seal (26). Remove bolts (27) from manifold (28) .
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9. Illustration 16 g00565113
19. Disconnect the harness assemblies which are attached to transmission modulating valves
(29). Remove transmission modulating valves (29) from the transmission housing.
Illustration 17 g00459316
20. Remove retaining ring (32) and gear (30). Remove retaining ring (31) .
Illustration 18 g00459322
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10. 21. Use Tooling (A) and a suitable lifting device to remove manifold (28). The weight of
manifold (28) is approximately 85 kg (190 lb).
22. Remove bolt (33) which holds the harness assembly in place.
Illustration 19 g00459352
23. Remove retaining ring (34) and bearing (35) from manifold (28) .
Illustration 20 g00459369
24. Remove retaining ring (36) and clutch housing (37) .
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11. Illustration 21 g00459372
25. Remove O-ring seal (38) from clutch housing (37) .
Illustration 22 g00459375
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 steel spacers and a suitable press to push on retainer plate (40). Remove retaining ring
(39) from the clutch housing.
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12. Illustration 23 g00459387
27. Separate retaining ring (39), retainer plate (40), three coned disc springs (41), and clutch
piston (42) .
Illustration 24 g00459393
28. Remove seal rings (43) from clutch piston (42) .
Illustration 25 g00459394
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13. 29. Remove seal rings (44) from clutch housing (37) .
Illustration 26 g00565119
30. Remove retaining ring (45) from the output shaft. Remove hub (46) .
Illustration 27 g00565685
31. Remove friction discs (47) and clutch plates (48) .
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15. Illustration 31 g00459506
35. Remove seal rings (57) and (58) from clutch piston (54) .
Illustration 32 g00565199
36. Use Tooling (A) and a suitable lifting device to remove housing (59). The weight of housing
(59) is approximately 66 kg (145 lb).
Note: The clutch piston may be stuck in housing (59). As housing (59) is removed, the
clutch piston may fall.
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16. Illustration 33 g00565203
37. Remove clutch piston (60) .
Illustration 34 g00459540
38. Remove seal rings (61) and (62) from clutch piston (60) .
Illustration 35 g00565255
39. Remove friction discs (63) and clutch plates (64) .
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18. 42. Remove retaining ring (71) and bearing (72) .
Illustration 39 g00459634
43. Use several small steel rods (73) (3.175 mm (0.1250 inch) diameter and one pointed tip) to
compress the retaining ring that holds carrier assembly (69) to ring gear (74) .
44. Remove carrier assembly (69) from ring gear (74) .
Illustration 40 g00459638
45. Remove retaining ring (75) from carrier assembly (69) .
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19. Illustration 41 g00459643
46. Use a hammer and a punch to push the spring pins through carrier assembly (69) and into
planetary shafts (76) .
47. Use a hammer and a punch to remove planetary shafts (76) from carrier assembly (69) .
Illustration 42 g00459646
48. Remove thrust discs (77), planetary gears (78), and bearings (79) from the carrier assembly.
Remove spring pins (80) from planetary shafts (76) .
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20. Illustration 43 g00565272
49. Remove retaining ring (81) that holds output shaft (82) to the input shaft. Remove output
shaft (82) .
Illustration 44 g00459776
50. Remove O-ring seal (83) from output shaft (82) .
Illustration 45 g00460029
51. Remove retaining ring (85) .
52. Remove sun gear (84) from output shaft (82) .
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21. Illustration 46 g00460030
53. Use a suitable press to push output shaft (82) out of bearing (86), as shown.
Illustration 47 g00460034
54. If necessary, remove bearings (87) from both ends of output shaft (82) .
Illustration 48 g00565282
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22. 55. Use Tooling (A) and a suitable lifting device to remove housing (88). The weight of housing
(88) is approximately 61 kg (135 lb).
Illustration 49 g00460042
56. Remove clutch piston (89), friction discs (90), and clutch plates (91) .
Illustration 50 g00460045
57. Remove seal rings (92) and (93) from clutch piston (89) .
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23. Illustration 51 g00460067
58. Remove retaining ring (94) from the input shaft.
59. Remove springs (95) and ring gear (96). Remove O-ring seals (97) and (98) .
Illustration 52 g00460068
60. Remove carrier assembly (99) from the input shaft. The weight of the carrier assembly is
approximately 29 kg (65 lb).
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24. Illustration 53 g00460074
61. Remove gear (100) .
62. Place a suitable wood block under carrier assembly (99) .
63. Use several small steel rods (101) (2.36 mm (0.093 inch) diameter and one pointed tip) to
compress the retaining ring that holds carrier assembly (99) to ring gear (102) together.
64. Remove ring gear (102) from carrier assembly (99) .
Illustration 54 g00460078
65. Remove retaining ring (105) from carrier assembly (99) .
66. Remove retaining ring (104). Remove sun gear (103) and the bearing. Use Tooling (B) to
remove sun gear (103) and the bearing.
Illustration 55 g00460081
67. Use a hammer and a punch to push the spring pins through carrier assembly (99) and into
planetary shafts (106) .
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25. Illustration 56 g00460134
68. Use a hammer and a punch to remove planetary shafts (106) from carrier assembly (99) .
Illustration 57 g00460135
69. Remove thrust discs (107), bearings (109), and planetary gears (108) from the carrier
assembly.
70. Remove spring pins (110) from planetary shafts (106) .
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26. Illustration 58 g00460138
71. Remove bearing (111) from sun gear (103) .
Illustration 59 g00460141
72. Remove O-ring seal (112) from sun gear (103) .
Illustration 60 g00460178
73. Remove plate (113) .
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27. Illustration 61 g00460181
74. Remove friction discs (114) and clutch plates (117). Remove O-ring seals (115) and (116) .
Illustration 62 g00460207
75. Use several small steel rods (118) (2.36 mm (0.093 inch) diameter and one pointed tip) to
compress the retaining ring that holds coupling (120) to carrier assembly (119). Remove
coupling (120) from carrier assembly (119) .
Note: Coupling (120) and carrier assembly (119) may be removed together at this time. Use
small steel rods (118) in order to separate coupling (120) and carrier assembly (119). See
Step 43 for similar actions.
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28. Illustration 63 g00460208
76. Remove clutch piston (121) from the clutch housing. Remove carrier assembly (119) .
Illustration 64 g00460209
77. Remove seal rings (122) and (123) from clutch piston (121) .
Illustration 65 g00460233
78. Remove retaining ring (124). Use Tooling (B) to remove bearing (125) .
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29. 79. Remove seal ring (126) from carrier assembly (119) .
Illustration 66 g00460237
80. Use a hammer and a punch to push the spring pins through carrier assembly (119) and into
planetary shafts (127) .
81. Use a hammer and a punch to remove planetary shafts (127) from carrier assembly (119) .
Illustration 67 g00460313
82. Remove thrust discs (128), planetary gears (129), and bearings (130) from the carrier
assembly. Remove spring pins (131) from planetary shafts (127) .
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30. Illustration 68 g00460315
83. Remove retaining ring (132) from housing (133) .
84. Use a soft hammer to remove input shaft (134) from housing (133) .
Illustration 69 g00460318
85. Remove ring seals (136) and O-ring seal (137) from input shaft (134). Remove bearing
(135) .
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31. Illustration 70 g00460322
86. Use a suitable press and Tooling (C) to remove race (138) from input shaft (134) .
Copyright 1993 - 2021 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
Sat Oct 16 19:06:12 UTC+0800 2021
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32. Shutdown SIS
Previous Screen
Product: WHEEL LOADER
Model: 972G WHEEL LOADER 6AW
Configuration: 972G Wheel Loader 6AW00001-UP (MACHINE) POWERED BY 3306 Engine
Disassembly and Assembly
966G and 972G Wheel Loaders Power Train
Media Number -RENR2106-08 Publication Date -01/05/2004 Date Updated -28/05/2004
i06064263
Transmission Planetary - Assemble
SMCS - 3160-016
Assembly Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 138-7575 Link Bracket 3
B 1P-0520 Driver Gp 1
D FT-2746 Guide Pin 2
E 1P-0510 Driver Gp 1
F - Loctite 5127 1
Note: Cleanliness is an important factor. Before assembly, all parts should be cleaned in cleaning
fluid. Allow the parts to air dry. Wiping cloths or rags should not be used to dry parts. Lint may be
deposited on the parts.
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33. Illustration 1 g00460318
Note: O-ring seal (137) is not installed at this time. The O-ring seal is shown in order to
clarify the installation in Step 11.
1. Raise the temperature of bearing (135) and the race. Install bearing (135) and the race onto
input shaft (134) , as shown.
2. Apply clean transmission oil to ring seals (136) . Install two ring seals (136) on input shaft
(134) .
Illustration 2 g00460315
3. Carefully install input shaft (134) in housing (133) .
4. Install retaining ring (132) in order to hold the input shaft and the bearing in place.
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34. Thank you very much for
your reading. Please Click
Here. Then Get COMPLETE
MANUAL. NO WAITING
NOTE:
If there is no response to
click on the link above,
please download the PDF
document first and then
click on it.
GET MORE OTHER MANUALS https://www.aservicemanualpdf.com/
GET MORE OTHER MANUALS https://www.aservicemanualpdf.com/
35. Illustration 3 g00460313
Illustration 4 g00460237
5. Install bearings (130) in planetary gears (129) . Install the gear assemblies, thrust discs
(128) , and planetary shafts (127) in carrier assembly (119) .
6. Use a hammer and a punch to install spring pins (131) that hold planetary shafts (127) in
carrier assembly (119) . Make sure that the spring pins are flush with the counterbore in the
carrier.
Illustration 5 g00460233
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36. 7. Install seal ring (126) on carrier assembly (119) .
8. Use Tooling (B) to install bearing (125) . Install retaining ring (124) .
Note: Coupling (120) may be installed on carrier assembly (119) at this time. Refer to Step
13 for the procedure.
Illustration 6 g00460209
9. Install seal rings (122) and (123) on clutch piston (121) .
Illustration 7 g00460208
10. Place suitable cribbing under the housing. Install clutch piston (121) in the clutch housing.
Make sure that the lips of the seals are facing downward.
11. Install O-ring seal (137) . Apply clean transmission oil to O-ring seal (137) and the O-ring
seal groove on the shaft. Refer to Illustration 1 for the location of the O-ring seal.
12. Install carrier assembly (119) .
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37. Illustration 8 g00460207
13. If necessary, install coupling (120) on carrier assembly (119) . Use small steel rods (118) to
compress the retaining ring that holds coupling (120) to carrier assembly (119) .
Illustration 9 g00460934
Illustration 10 g00720054
Note: For assembly purposes, use Tooling (D) to hold the clutch plates in place. Do not
remove Tooling (D) until Step 85 is completed.
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