This service repair manual provides instructions for disassembling a 988H wheel loader torque converter. It lists 72 steps and required tools to remove all components of the torque converter. Key parts that are dismantled include the housing assembly, carrier assembly, turbine, impeller, stator, shafts, gears, seals, and bearings. Detailed illustrations accompany each step to show how to properly disassemble the torque converter.
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2. 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
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
138-7575 Link Bracket 2
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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3. 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
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4. 1. Place the torque converter assembly (1) on suitable cribbing, as shown. The weight of
torque converter assembly (1) is approximately545 kg (1200 lb).
Illustration 2 g00665406
2. Remove bolt (2) and retainer (3) .
Illustration 3 g00665411
3. Remove O-ring seal (4) and yoke (5) .
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5. Illustration 4 g00665412
4. Remove bolts (6) and the washers.
Illustration 5 g01152195
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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7. 11. Remove O-ring seals (11) and (12) .
Illustration 9 g00665426
Illustration 10 g00665427
12. Remove bolts (13) . Do not remove two bolts (14) at this time.
Illustration 11 g00660851
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8. 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.
Illustration 12 g00660854
15. Remove bearing (16) .
16. Remove the ring and the plate below bearing (16) .
Illustration 13 g00660856
17. Remove turbine (17) .
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9. Illustration 14 g00660858
18. Remove the plate (not shown) and remove bearing (18) .
19. Remove the ring and the plate below bearing (18) .
Illustration 15 g00660859
20. Remove bearing cup (19) .
Illustration 16 g01152217
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10. 21. Use appropriate equipment in order to turn housing (20) onto the opposite side.
22. Remove O-ring seal (21) and two plugs (22) .
Illustration 17 g01152220
23. Remove bolts (23) and the washers from turbine (17) .
24. Remove plate (24) .
25. Remove hub (25) from turbine (17) .
Illustration 18 g00662857
26. Place torque converter assembly on suitable cribbing, as shown.
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11. Illustration 19 g00662858
27. Remove retaining ring (26) and stator (27) .
Illustration 20 g00662860
28. Remove spacer (28) .
29. Remove bearing (29) .
30. Remove the plate and the ring below the bearing (29) .
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12. Illustration 21 g00662862
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).
Illustration 22 g03389696
33. Remove plate (32a) , bearing (32b) , plate (32c) , and ring (32d) .
Note: Plate (32a) may stick to the impeller.
Illustration 23 g00662864
34. Remove bearing cup (33) from impeller (31) .
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14. Illustration 26 g00662868
39. Remove two friction discs (37) and one wear plate.
Illustration 27 g00662869
40. Remove piston (38) .
Illustration 28 g00662871
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).
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15. Illustration 29 g00662872
42. Remove 12 bolts (41) and gear (42) from housing assembly (39) .
Illustration 30 g00663774
Typical Example
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16. Illustration 31 g00662873
43. Remove bearing cup (43) from gear (42) .
Illustration 32 g00662877
44. Remove bolts (44) and sleeve (45) .
45. Remove the ring seal from sleeve (45) .
46. Remove ring seal (46) .
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17. Illustration 33 g00663023
47. Remove seal (47) .
48. Remove seals (48) .
49. Remove ring (49) .
Illustration 34 g00663084
50. Place shaft assembly in a suitable press. Carefully press inner shaft (50) from outer shaft
(51) .
Illustration 35 g00663095
51. Use a suitable press in order to remove bearing (52) and seal carrier (53) from inner shaft
(50) .
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18. Illustration 36 g00663096
52. Use a hammer and a punch in order to remove pin (54) from outer shaft assembly (51) .
Illustration 37 g00663097
53. Use Tooling (D) in order to remove seal carrier (55) from outer shaft (51) .
Illustration 38 g00663098
54. Use Tooling (E) in order to remove bearing (56) from outer shaft (51) .
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19. Illustration 39 g00663100
55. Remove retaining ring (57) and plate (58) from stator (27) . Repeat this procedure for the
opposite side.
Illustration 40 g00663101
Illustration 41 g00663781
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20. 56. Remove retaining ring (59) .
57. Place stator (27) in a suitable press, as shown.
58. Remove adapter (60) from stator (27) .
Illustration 42 g00663255
59. Remove bolts (61) .
Illustration 43 g00663256
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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21. Illustration 44 g00663257
62. Remove O-ring seals (63) from adapter (62) .
Illustration 45 g00663261
63. Remove bearing cup (64) and seal (65) from adapter (62) .
Illustration 46 g00663265
64. Remove gear assembly (66) .
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22. Illustration 47 g00663268
65. Use Tooling (D) in order to remove bearing cone (67) from gear assembly (66) .
Illustration 48 g00663276
66. Remove retaining ring (68) and adapter (69) from gear assembly (66) .
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23. Illustration 49 g00663279
67. Remove retaining ring (70) from adapter (69) . Remove plate (71) .
Illustration 50 g00663311
68. Use Tooling (D) in order to remove bearing cone (72) from gear assembly (66) .
Illustration 51 g00663620
69. Remove shim pack (73) and bearing cup (74) .
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24. Illustration 52 g00663622
70. Remove three bolts (75) and cover (76) .
Illustration 53 g00663623
71. Remove O-ring seal (77) from cover (76) .
Illustration 54 g00663624
72. Remove bolt (78) and the washer.
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25. 73. Remove idler gear shaft (79) .
Illustration 55 g03410188
If equipped with this style lube adapter.
Illustration 56 g03410201
If equipped with this style lube adapter.
74. Remove lube adapter (79a) , (79b) .
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26. Illustration 57 g00663626
75. Remove idler gear assembly (80) .
Illustration 58 g00663627
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.
Illustration 59 g00663628
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27. 78. Remove bolts (83) and block (84) .
Illustration 60 g00663671
79. Remove O-rings (85) and plugs (86) .
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All Rights Reserved.
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28. 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
138-7573 Link Bracket 1
138-7575 Link Bracket 2
B 138-7575 Link Bracket 3
H 1P-0520 Driver Gp 1
J 8T-5096 Dial Indicator Gp 1
J 4C-4030 Loctite -
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29. Illustration 1 g00663671
1. Install O-rings (85) and plugs (86).
Illustration 2 g00663628
2. Install block (84) and bolts (83).
Illustration 3 g00663627
3. Install bearing assemblies (81) and ring (82) into idler gear assembly (80).
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31. Illustration 4 g00663626
4. Install idler gear assembly (80).
Illustration 5 g03410201
If equipped with this style lube adapter.
Illustration 6 g03410188
If equipped with this style lube adapter.
5. Install lube adapter (79b), (79a). Use Tooling (J) on threads of (79b) and (79a).
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32. Illustration 7 g00663624
6. Install idler gear shaft (79). Install bolt (78) and the washer.
Illustration 8 g00663623
7. Install O-ring seal (77) onto cover (76).
Illustration 9 g00663622
8. Install cover (76) and three bolts (75).
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33. Illustration 10 g00663620
9. Lower the temperature of bearing cup (74) and install bearing cup (74). Install entire shim
pack (73).
Illustration 11 g01153378
10. Raise the temperature of bearing cone (72). Install bearing cone (72) onto gear assembly
(66).
Illustration 12 g00663279
11. Install plate (71) onto adapter (69). Install retaining ring (70) into adapter (69).
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