Caterpillar Cat 988H Wheel Loader (Prefix A7A) Service Repair Manual (A7A00001 and up).pdf

Service Repair Manual
Models
988H Wheel Loader

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Product: WHEEL LOADER
Model: 988H WHEEL LOADER A7A
Configuration: 988H Wheel Loader A7A00001-UP (MACHINE) POWERED BY C18 Engine
Disassembly and Assembly
988H and 988K Wheel Loaders Power Train
Media Number -RENR6206-05 Publication Date -01/07/2015 Date Updated -10/07/2015
i05870306
Torque Converter - Disassemble
SMCS - 3101-015
S/N - A7A1-UP
S/N - BXY1-UP
Disassembly Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A
138-7573 Link Bracket 1
B 138-7575 Link Bracket 2
C
8B-7548 Push-Puller Tool Gp 1
8H-0684 Ratchet Wrench 1
8B-7549 Puller Leg 2
5P-4808 Cap 2
8B-7554 Bearing Cup Puller 1
D 5F-7366 Screw 1
3H-0465 Plate 2
1P-5546 Crossblock 1
5H-7369 Puller Leg 2
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988H Wheel Loader A7A00001-UP (MACHINE) POWERED BY C18 Engine(SEBP...
2021/2/13
https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sis...

8B-7551 Bearing Puller 1
6B-6682 3/4" - 16 NF Nut 2
1P-0520 Driver Gp 1
E
5F-7366 Screw 1
3H-0465 Plate 2
1P-5546 Crossblock 1
8B-7549 Puller Leg 2
5F-7343 Bearing Puller 1
6B-6682 3/4" - 16 NF Nut 2
1P-0520 Driver Gp 1
5F-7342 Adapter 2
F 138-7574 Link Bracket 2
G -
Forcing Screw
M12 x 1.75
2
Start By:
A. Remove the torque converter. Refer to Disassembly and Assembly, "Torque Converter -
Remove" for the machine that is being serviced.
B. Remove the transmission oil pump. Refer to Disassembly and Assembly, "Transmission Oil
Pump - Remove" for the machine that is being serviced.
C. Remove the torque converter outlet relief valve. Refer to Disassembly and Assembly,
"Relief Valve (Torque Converter Outlet) - Remove" for the machine that is being serviced.
D. Remove the modulating valve for the torque converter impeller clutch. Refer to
Disassembly and Assembly, "Modulating Valve (Torque Converter Impeller Clutch) -
Remove" for the machine that is being serviced.
Illustration 1 g00660840
2/26
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1. Place the torque converter assembly (1) on suitable cribbing, as shown. The weight of
torque converter assembly (1) is approximately545 kg (1200 lb).
2. Remove bolt (2) and retainer (3) .
3. Remove O-ring seal (4) and yoke (5) .
3/26
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4. Remove bolts (6) and the washers.
5. Install Tooling (A) and a suitable lifting device to the housing assembly. The weight of the
housing assembly is approximately 285 kg (630 lb).
6. Use Tooling (G) in order to separate the housing assembly from the torque converter.
7. Remove the housing assembly.
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8. Remove bolts (7) and retainer (8) .
9. Remove seal (9) from retainer (8) .
10. Remove gasket (10) .
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11. Remove O-ring seals (11) and (12) .
12. Remove bolts (13) . Do not remove two bolts (14) at this time.
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13. Install Tooling (B) and a suitable lifting device to carrier assembly (15) . The weight of
carrier assembly (15) is approximately 160 kg (350 lb).
14. Remove carrier assembly (15) and the shaft as a unit.
15. Remove bearing (16) .
16. Remove the ring and the plate below bearing (16) .
17. Remove turbine (17) .
7/26
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18. Remove the plate (not shown) and remove bearing (18) .
19. Remove the ring and the plate below bearing (18) .
20. Remove bearing cup (19) .
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21. Use appropriate equipment in order to turn housing (20) onto the opposite side.
22. Remove O-ring seal (21) and two plugs (22) .
23. Remove bolts (23) and the washers from turbine (17) .
24. Remove plate (24) .
25. Remove hub (25) from turbine (17) .
26. Place torque converter assembly on suitable cribbing, as shown.
9/26
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27. Remove retaining ring (26) and stator (27) .
28. Remove spacer (28) .
29. Remove bearing (29) .
30. Remove the plate and the ring below the bearing (29) .
10/26
988H Wheel Loader A7A00001-UP (MACHINE) POWERED BY C18 Engine(SEB...
2021/2/13

31. Remove retaining ring (30) .
32. Use two persons in order to remove impeller (31) . The weight of impeller (31) is
approximately 30 kg (65 lb).
33. Remove plate (32a) , bearing (32b) , plate (32c) , and ring (32d) .
Note: Plate (32a) may stick to the impeller.
34. Remove bearing cup (33) from impeller (31) .
11/26
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35. Remove bolts (34) and the washers.
36. Remove impeller (31) from adapter assembly (35) .
37. Remove bolts (14) .
38. Remove plate (36) .
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39. Remove two friction discs (37) and one wear plate.
40. Remove piston (38) .
41. Use two persons in order to remove housing assembly (39) from shaft (40) . The weight of
housing assembly (39) is approximately 45 kg (100 lb).
13/26
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42. Remove 12 bolts (41) and gear (42) from housing assembly (39) .
Typical Example
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43. Remove bearing cup (43) from gear (42) .
44. Remove bolts (44) and sleeve (45) .
45. Remove the ring seal from sleeve (45) .
46. Remove ring seal (46) .
15/26
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47. Remove seal (47) .
48. Remove seals (48) .
49. Remove ring (49) .
50. Place shaft assembly in a suitable press. Carefully press inner shaft (50) from outer shaft
(51) .
51. Use a suitable press in order to remove bearing (52) and seal carrier (53) from inner shaft
(50) .
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52. Use a hammer and a punch in order to remove pin (54) from outer shaft assembly (51) .
53. Use Tooling (D) in order to remove seal carrier (55) from outer shaft (51) .
54. Use Tooling (E) in order to remove bearing (56) from outer shaft (51) .
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55. Remove retaining ring (57) and plate (58) from stator (27) . Repeat this procedure for the
opposite side.
18/26
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56. Remove retaining ring (59) .
57. Place stator (27) in a suitable press, as shown.
58. Remove adapter (60) from stator (27) .
59. Remove bolts (61) .
60. Install bolts (61) as forcing screws. Attach Tooling (F) and a suitable lifting device to
adapter (62) . The weight of adapter (62) is approximately 30 kg (65 lb).
61. Remove adapter (62) .
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62. Remove O-ring seals (63) from adapter (62) .
63. Remove bearing cup (64) and seal (65) from adapter (62) .
64. Remove gear assembly (66) .
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65. Use Tooling (D) in order to remove bearing cone (67) from gear assembly (66) .
66. Remove retaining ring (68) and adapter (69) from gear assembly (66) .
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67. Remove retaining ring (70) from adapter (69) . Remove plate (71) .
68. Use Tooling (D) in order to remove bearing cone (72) from gear assembly (66) .
69. Remove shim pack (73) and bearing cup (74) .
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70. Remove three bolts (75) and cover (76) .
71. Remove O-ring seal (77) from cover (76) .
72. Remove bolt (78) and the washer.
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73. Remove idler gear shaft (79) .
If equipped with this style lube adapter.
74. Remove lube adapter (79a) , (79b) .
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75. Remove idler gear assembly (80) .
76. Remove bearing assemblies (81) and ring (82) from idler gear assembly (80) .
77. Repeat steps 59 through 76 in order to remove the remaining pump adapter.
25/26
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78. Remove bolts (83) and block (84) .
79. Remove O-rings (85) and plugs (86) .
Copyright 1993 - 2021 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
Sat Feb 13 10:45:59 UTC+0800 2021
26/26
2021/2/13

Shutdown SIS
Previous Screen
Product: WHEEL LOADER
Model: 988H WHEEL LOADER A7A
Configuration: 988H Wheel Loader A7A00001-UP (MACHINE) POWERED BY C18 Engine
Disassembly and Assembly
988H and 988K Wheel Loaders Power Train
Media Number -RENR6206-05 Publication Date -01/07/2015 Date Updated -10/07/2015
i06677468
Torque Converter - Assemble
SMCS - 3101-016
S/N - A7A1-UP
S/N - BXY1-UP
Assembly Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A
B 138-7575 Link Bracket 3
H 1P-0520 Driver Gp 1
J 8T-5096 Dial Indicator Gp 1
J 4C-4030 Loctite -
1/22
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1. Install O-rings (85) and plugs (86).
2. Install block (84) and bolts (83).
3. Install bearing assemblies (81) and ring (82) into idler gear assembly (80).
2/22
2021/2/13

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4. Install idler gear assembly (80).
5. Install lube adapter (79b), (79a). Use Tooling (J) on threads of (79b) and (79a).
3/22
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6. Install idler gear shaft (79). Install bolt (78) and the washer.
7. Install O-ring seal (77) onto cover (76).
8. Install cover (76) and three bolts (75).
4/22
2021/2/13

9. Lower the temperature of bearing cup (74) and install bearing cup (74). Install entire shim
pack (73).
10. Raise the temperature of bearing cone (72). Install bearing cone (72) onto gear assembly
(66).
11. Install plate (71) onto adapter (69). Install retaining ring (70) into adapter (69).
5/22
2021/2/13

Caterpillar Cat 988H Wheel Loader (Prefix A7A) Service Repair Manual (A7A00001 and up).pdf

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Caterpillar Cat 988H Wheel Loader (Prefix A7A) Service Repair Manual (A7A00001 and up).pdf