988G Wheel Loader Power Train Torque Converter (Lockup) - Disassemble - Type 2 Caterpillar


Torque Converter (Lockup) - Disassemble - Type 2
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1.1. Disassembly Procedure

Disassembly Procedure

Table 1
Required Tools 
Tool  Part Number  Part Description  Qty 
138-7573  Link Bracket 
138-7575 Link Bracket 
5F-7366  Screw 
3H-0465 Plate 
1P-5546 Crossblock 
5H-7369 Puller Leg 
6B-6682 3/4" - 16 NF Nut 
1P-0520 Driver Gp 
4C-5653 Threaded Adapter 
188-1456  Metric Eyebolt 
138-7575  Link Bracket 
138-7575  Link Bracket 
5F-7366  Screw 
3H-0465 Plate 
1P-5546 Crossblock 
5H-7369 Puller Leg 
8B-7551 Bearing Puller 
6B-6682 3/4" - 16 NF Nut 
1P-0520 Driver Gp 
5F-7366  Screw 
3H-0465 Plate 
1P-5546 Crossblock 
8B-7549 Puller Leg 
5F-7343 Bearing Puller 
6B-6682 3/4" - 16 NF Nut 
1P-0520 Driver Gp 
5F-7342 Adapter 
1P-0520  Driver Gp 
138-7574  Link Bracket 

Start By:

  1. Remove the torque converter. Refer to Disassembly and Assembly, "Torque Converter - Remove" for the machine that is being serviced.

  2. Remove the transmission oil pump. Refer to Disassembly and Assembly, "Transmission Oil Pump - Remove" for the machine that is being serviced.

  3. 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.

  4. 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.

  5. Remove the modulating valve for the torque converter lockup clutch. Refer to Disassembly and Assembly, "Modulating Valve (Torque Converter Lockup Clutch) - Remove" for the machine that is being serviced.


    Illustration 1g00673844

  1. Place the torque converter assembly on cribbing. The weight of the torque converter assembly is 545 kg (1200 lb).


    Illustration 2g00660841

  2. Remove speed sensor (1).


    Illustration 3g00665406

  3. Remove bolt (2) and retainer (3).


    Illustration 4g00665411

  4. Remove O-ring seal (4) and yoke (5).


    Illustration 5g00665412

  5. Remove eleven bolts (6) and the washers.


    Illustration 6g00665414

  6. Install Tooling (A) to housing assembly.

  7. Attach a suitable lifting device and lifting chains to Tooling (A).

  8. Use M12 x 1.75 forcing screws in order to separate housing assembly from the torque converter.

  9. Use the suitable lifting device in order to remove housing assembly. The weight of the housing assembly is 285 kg (630 lb).


    Illustration 7g00660846

  10. Remove eight bolts (7) and retainer (8).


    Illustration 8g00660847

  11. Remove seal (9) from retainer (8).


    Illustration 9g00660849

  12. Remove gasket (10).

  13. Remove O-ring seal (11) and (12).


    Illustration 10g00673879


    Illustration 11g00673880

  14. Position torque converter assembly onto the side, as shown.

  15. Remove six bolts (13) and cover (14).


    Illustration 12g00673881

  16. Remove two bolts (15), retainer (16), and washer (17).


    Illustration 13g00673882

  17. Use Tooling (B) in order to push the shaft out of the bearing.


    Illustration 14g00673883

  18. Position torque converter assembly upright, as shown.

  19. Install Tooling (C) to shaft assembly (18).

  20. Attach a suitable lifting device and a sling to Tooling (C).

  21. Use the suitable lifting device in order to remove shaft assembly (18). The weight of shaft assembly (18) is 17 kg (38 lb).


    Illustration 15g00673886

  22. Use a suitable press in order to remove bearing (19) and seal carrier (20) from inner shaft (18).


    Illustration 16g01061064


    Illustration 17g01061071

  23. Remove 36 bolts (21), and washers (22). Do not remove two bolts (25) at this time.


    Illustration 18g00673887

  24. Install Tooling (D).

  25. Attach a suitable lifting device and lifting slings to Tooling (D).

  26. Use the suitable lifting device in order to remove carrier assembly (23). The weight of carrier assembly (23) is 132 kg (290 lb).


    Illustration 19g00673888

  27. Place carrier assembly (23), as shown.

  28. Remove stator (24).


    Illustration 20g01060995


    Illustration 21g01061000

  29. Remove retaining ring (29) and plate (28) from stator (24). Remove ring (26) (not shown), and plate (27) (not shown) from the other side of stator (24).

  30. Use a suitable press in order to remove adapter (30) from stator (24).


    Illustration 22g00674499

  31. Remove spacer (33).


    Illustration 23g00674501

  32. Remove bearing (34).

  33. Remove the plate and the ring below bearing (34).


    Illustration 24g00674503

  34. Remove retaining ring (35).


    Illustration 25g00674504

  35. Use two persons in order to remove impeller (36). The weight of impeller (36) is 29 kg (65 lb).


    Illustration 26g00674505

  36. Remove race (37) from impeller (36).


    Illustration 27g00674506

  37. Remove twelve bolts (38) and the washers.

  38. Remove impeller (36) from adapter assembly (39).


    Illustration 28g03389759

  39. Remove plate (40a), bearing (40b), plate (40c), and ring (40d).


    Illustration 29g01061078

  40. Remove two bolts (25) and plate (41).

    Note: Bolts (25) are on the underside of plate (41).



    Illustration 30g00674510

  41. Remove two friction discs (42) and one wear plate.


    Illustration 31g00674512

  42. Remove piston (43).


    Illustration 32g00674516

  43. Remove seal (44) from piston (43).


    Illustration 33g00674514

  44. Install Tooling (E) to housing assembly (45).

  45. Attach a suitable lifting device and slings to housing assembly (45).

  46. Use the suitable lifting device in order to remove housing assembly (45). The weight of housing assembly (45) is 45 kg (100 lb).


    Illustration 34g00674519

  47. Remove twelve bolts (46) and gear (47) from housing assembly (45).


    Illustration 35g00674520

  48. Remove race (48) from gear (47).


    Illustration 36g00674521

  49. Remove eight bolts (49) and sleeve (50).


    Illustration 37g00674522

  50. Remove seal (51) from sleeve (50).


    Illustration 38g00674523

  51. Remove seal (52).

  52. Remove two seals (53).

  53. Remove retaining ring (54).


    Illustration 39g00674524

  54. Use a hammer and a punch in order to remove pin (55).


    Illustration 40g00674721

  55. Use Tooling (F) in order to remove ring carrier (56).


    Illustration 41g00674722

  56. Use Tooling (G) in order to remove bearing (57).


    Illustration 42g00674723

  57. Remove bearing (58).

  58. Remove the plate and the ring below bearing (58).


    Illustration 43g00674725

  59. Use appropriate equipment to turn the housing onto the opposite side.

  60. Remove O-ring seal (59) and two plugs (60).


    Illustration 44g00674726

  61. Use suitable cribbing in order to support the turbine and hub assembly. Place the cribbing inside the housing assembly.

  62. Use Tooling (H) in order to remove the hub from bearing (61).


    Illustration 45g00674727

  63. Remove bearing (61).


    Illustration 46g00674744


    Illustration 47g00674747

  64. Remove 24 bolts (62) and hub (63) from turbine (64).

  65. Remove clutch adapter (65).


    Illustration 48g01924533

  66. Remove plate (66) and bearing (67).

  67. Remove the plate and the ring below bearing (67).


    Illustration 49g01924775

  68. Remove retaining ring (68) and plate (69).


    Illustration 50g01924777


    Illustration 51g01924895

  69. Remove two wear plates (70) and two friction discs (71).


    Illustration 52g01924913

  70. Remove piston (72).

    Note: It may be necessary to use shop air under pressure of 621 kPa (90 psi) to remove piston (72).



    Illustration 53g01925054

  71. Remove seal (73) from piston (72).

    Note: The following steps are used for the removal and disassembly of the pump drives.



    Illustration 54g01925096

  72. Remove seven bolts (74).


    Illustration 55g01925106

  73. Install two forcing screws and Tooling (J).

  74. Attach a suitable lifting device and lifting slings to Tooling (J).

  75. Use the suitable lifting device in order to remove adapter (75). The weight of adapter (75) is 30 kg (65 lb).

    Note: If necessary, use forcing screws to separate adapter (75) from the housing.



    Illustration 56g01925114

  76. Remove two O-ring seals (76) from adapter (75).


    Illustration 57g01925125

  77. Remove race (77) and seal (78) from adapter (75).


    Illustration 58g01925633

  78. Remove gear assembly (79).


    Illustration 59g01925655

  79. Use Tooling (F) in order to remove bearing (80) from gear assembly (79).


    Illustration 60g01925696

  80. Remove retaining ring (81) and adapter (82) from gear assembly (79).


    Illustration 61g01925716

  81. Remove retaining ring (83) from adapter (82). Remove plate (84).


    Illustration 62g01925721

  82. Use Tooling (F) in order to remove bearing (85) from gear assembly (79).


    Illustration 63g01925744

  83. Remove shim pack (86) and race (87).


    Illustration 64g01925815

  84. Remove three bolts (88) and cover (89).


    Illustration 65g01926035

  85. Remove O-ring seal (90) from cover (89).


    Illustration 66g01926053

  86. Remove bolt (91) and the washer.

  87. Remove idler gear shaft (92).


    Illustration 67g03410576
    If equipped with this style lube adapter.


    Illustration 68g03410578
    If equipped with this style lube adapter.

  88. Remove lube adapter (91a), (92b).


    Illustration 69g01926061

  89. Remove idler gear assembly (93).


    Illustration 70g01926133

  90. Remove two bearings (94) and ring (95) from idler gear assembly (93).


    Illustration 71g01926157

  91. Remove four bolts (96) and block (97).


    Illustration 72g01926163

  92. Remove five O-rings (98) and three plugs (99).

  93. Repeat steps 72 through 92 in order to remove the remaining pump adapter.

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