Caterpillar Cat 988K Wheel Loader (Prefix TWX) Service Repair Manual (TWX00001 and up)

1
Service Repair Manual
Models 988K Wheel Loader
2
Shutdown SIS
Previous Screen
Product WHEEL LOADER Model 988K WHEEL LOADER
TWX Configuration 988K Wheel Loader TWX00001-UP
(MACHINE) POWERED BY C18 Engine Disassembly and
Assembly 836K Landfill Compactor, 834K Wheel
Dozer and 988K Wheel Loader Power Train Media
Number -KENR6490-06 Publication Date
-01/09/2015 Date Updated -05/12/2017
i02071477
Torque Converter (Lockup) - Disassemble SMCS -
3101-015-L7 Disassembly Procedure Table 1
Required Tools Required Tools Required Tools Required Tools
Tool Part Number Part Description Qty
A 138-7573 Link Bracket 1
A 138-7575 Link Bracket 2
B 5F-7366 Screw 1
B 3H-0465 Plate 2
B 1P-5546 Crossblock 1
B 5H-7369 Puller Leg 2
B 6B-6682 3/4" - 16 NF Nut 2
B 1P-0520 Driver Gp 1
B 4C-5653 Threaded Adapter 2
C 188-1456 Metric Eyebolt 1
D 138-7575 Link Bracket 2
E 138-7575 Link Bracket 3
F 5F-7366 Screw 1
F 3H-0465 Plate 2
F 1P-5546 Crossblock 1
3
5H-7369 Puller Leg 2
8B-7551 6B-6682 1P-0520 Bearing Puller 3/4" - 16 NF Nut Driver Gp 1 2 1
5F-7366 Screw 1
3H-0465 Plate 2
1P-5546 Crossblock 1
G 8B-7549 5F-7343 Puller Leg Bearing Puller 2 1
6B-6682 3/4" - 16 NF Nut 2
1P-0520 Driver Gp 1
5F-7342 Adapter 2
H 1P-0520 Driver Gp 1
J 138-7574 Link Bracket 2

• Start By
• Remove the torque converter. Refer to Disassembly
  and Assembly, "Torque Converter - Remove" for
  the machine that is being serviced.
• Remove the transmission oil pump. Refer to
  Disassembly and Assembly, "Transmission Oil Pump
  - Remove" for the machine that is being serviced.
• 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.
• 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.
• 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.

4
Illustration 1 g00673844 1. Place the torque
converter assembly on cribbing. The weight of the
torque converter assembly is 545 kg (1200 lb).
Illustration 2
g00660841
2. Remove speed sensor (1).
Illustration 3
g00665406
3. Remove bolt (2) and retainer (3).
5
Illustration 4
g00665411
4. Remove O-ring seal (4) and yoke (5).
Illustration 5
g00665412
5. Remove eleven bolts (6) and the washers.
Illustration 6
g00665414

1. Install Tooling (A) to housing assembly.
2. Attach a suitable lifting device and lifting
   chains to Tooling (A).

6
https//www.aservicemanualpdf.com/ My Dear
Friend! Thank you very much for visiting. Full
manual if required, please enter the following
URL into your browser. https//www.aservicemanual
pdf.com/
7

1. Use M12 x 1.75 forcing screws in order to
   separate housing assembly from the torque
   converter.
2. Use the suitable lifting device in order to
   remove housing assembly. The weight of the
   housing assembly is 285 kg (630 lb).

Illustration 7
g00660846
10. Remove eight bolts (7) and retainer (8).
Illustration 8
g00660847
11. Remove seal (9) from retainer (8).
8
Illustration 9
g00660849

1. Remove gasket (10).
2. Remove O-ring seal (11) and (12).

Illustration 10
g00673879

• Illustration 11 g00673880
• Position torque converter assembly onto the side,
  as shown.
• Remove six bolts (13) and cover (14).

9
Illustration 12 g00673881 16. Remove two bolts
(15), retainer (16), and washer (17).
Illustration 13 g00673882 17. Use Tooling (B) in
order to push the shaft out of the bearing.

• Illustration 14 g00673883
• Position torque converter assembly upright, as
  shown.
• Install Tooling (C) to shaft assembly (18).
• Attach a suitable lifting device and a sling to
  Tooling (C).
• Use the suitable lifting device in order to
  remove shaft assembly (18). The weight of shaft
  assembly (18) is 17 kg (38 lb).

10
Illustration 15 g00673886 22. Use a suitable
press in order to remove bearing (19) and seal
carrier (20) from inner shaft (18).
Illustration 16
g01061064
Illustration 17 g01061071 23. Remove 36 bolts
(21), and washers (22). Do not remove two bolts
(25) at this time.
11
Illustration 18
g00673887

1. Install Tooling (D).
2. Attach a suitable lifting device and lifting
   slings to Tooling (D).
3. Use the suitable lifting device in order to
   remove carrier assembly (23). The weight of
   carrier assembly (23) is 132 kg (290 lb).

Illustration 19
g00673888

1. Place carrier assembly (23), as shown.
2. Remove stator (24).

12
Illustration 20
g01060995

• Illustration 21 g01061000
• 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).
• Use a suitable press in order to remove adapter
  (30) from stator (24).

Illustration 22
g00674499
31. Remove spacer (33).
Illustration 23
g00674501
13

1. Remove bearing (34).
2. Remove the plate and the ring below bearing (34).

Illustration 24
g00674503
34. Remove retaining ring (35).
Illustration 25 g00674504 35. Use two persons in
order to remove impeller (36). The weight of
impeller (36) is 29 kg (65 lb).
Illustration 26
g00674505
14
36. Remove race (37) from impeller (36).

• Illustration 27 g00674506
• Remove twelve bolts (38) and the washers.
• Remove impeller (36) from adapter assembly (39).

Illustration 28
g00674507

1. Remove bearing (40).
2. Remove the plate and the ring below bearing (40).

15
Illustration 29
g01061078
41. Remove two bolts (25) and plate (41). Note
Bolts (25) are on the underside of plate (41).
Illustration 30 g00674510 42. Remove two
friction discs (42) and one wear plate.
Illustration 31
g00674512
43. Remove piston (43).
16
Illustration 32
g00674516
44. Remove seal (44) from piston (43).

• Illustration 33 g00674514
• Install Tooling (E) to housing assembly (45).
• Attach a suitable lifting device and slings to
  housing assembly (45).
• Use the suitable lifting device in order to
  remove housing assembly (45). The weight of
  housing assembly (45) is 45 kg (100 lb).

Illustration 34 g00674519 48. Remove twelve
bolts (46) and gear (47) from housing assembly
(45).
17
Illustration 35
g00674520
49. Remove race (48) from gear (47).
Illustration 36
g00674521
50. Remove eight bolts (49) and sleeve (50).
Illustration 37
g00674522
51. Remove seal (51) from sleeve (50).
18
Illustration 38
g00674523

1. Remove seal (52).
2. Remove two seals (53).
3. Remove retaining ring (54).

Illustration 39 g00674524 55. Use a hammer and a
punch in order to remove pin (55).
Illustration 40 g00674721 56. Use Tooling (F) in
order to remove ring carrier (56).
19
Illustration 41 g00674722 57. Use Tooling (G) in
order to remove bearing (57).
Illustration 42
g00674723

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

Illustration 43 g00674725 60. Use appropriate
equipment to turn the housing onto the opposite
side.
20
61. Remove O-ring seal (59) and two plugs (60).

• Illustration 44 g00674726
• Use suitable cribbing in order to support the
  turbine and hub assembly. Place the cribbing
  inside the housing assembly.
• Use Tooling (H) in order to remove the hub from
  bearing (61).

Illustration 45
g00674727
64. Remove bearing (61).
Illustration 46
g00674744
21

• Illustration 47 g00674747
• Remove 24 bolts (62) and hub (63) from turbine
  (64).
• Remove clutch adapter (65).

Illustration 48 g00674748 67. Remove retaining
ring (66) and plate (67).
Illustration 49
g00674750
22
Illustration 50 g00674788 68. Remove two wear
plates (68) and two friction discs (69).
Illustration 51
g00674790
69. Remove piston (70). Note It may be necessary
to use shop air under pressure of 621 kPa (90
psi) to remove piston (70).
Illustration 52
g00674791
70. Remove seal (71) from piston (70).
23
Note The following steps are used for the
removal and disassembly of the pump drives.
Illustration 53
g00674951
71. Remove seven bolts (72).

• Illustration 54 g00674952
• Install two forcing screws and Tooling (J).
• Attach a suitable lifting device and lifting
  slings to Tooling (J).
• Use the suitable lifting device in order to
  remove adapter (73). The weight of adapter (73)
  is 30 kg (65 lb).
• Note If necessary, use forcing screws to
  separate adapter (73) from the housing.

24
Illustration 55 g00674953 75. Remove two O-ring
seals (74) from adapter (73).
Illustration 56 g00674954 76. Remove race (75)
and seal (76) from adapter (73).
Illustration 57
g00674955
77. Remove gear assembly (77).
25
Illustration 58 g00674956 78. Use Tooling (F) in
order to remove bearing (78) from gear assembly
(77).
Illustration 59 g00674957 79. Remove retaining
ring (79) and adapter (80) from gear assembly
(77).
Illustration 60 g00674959 80. Remove retaining
ring (81) from adapter (80). Remove plate (82).
26
Illustration 61 g00674960 81. Use Tooling (F) in
order to remove bearing (83) from gear assembly
(77).
Illustration 62
g00674961
82. Remove shim pack (84) and race (85).
Illustration 63
g00674980
83. Remove three bolts (86) and cover (87).
27
Illustration 64 g00674982 84. Remove O-ring seal
(88) from cover (87).
Illustration 65
g00674983

1. Remove bolt (89) and the washer.
2. Remove idler gear shaft (90).

Illustration 66
g00674984
87. Remove idler gear assembly (91).
28
Illustration 67 g00674986 88. Remove two
bearings (92) and ring (93) from idler gear
assembly (91).
Illustration 68
g00674987
89. Remove four bolts (94) and block (95).

• Illustration 69 g00674989
• Remove five O-rings (96) and three plugs (97).
• Repeat steps 71 through 90 in order to remove the
  remaining pump adapter.

29
Shutdown SIS
Previous Screen
Product WHEEL LOADER Model 988K WHEEL LOADER
TWX Configuration 988K Wheel Loader TWX00001-UP
(MACHINE) POWERED BY C18 Engine Disassembly and
Assembly 836K Landfill Compactor, 834K Wheel
Dozer and 988K Wheel Loader Power Train Media
Number -KENR6490-06 Publication Date
-01/09/2015 Date Updated -05/12/2017
i02719081
Torque Converter (Lockup) - Assemble SMCS -
3101-016-L7 Assembly Procedure Table 1
Required Tools Required Tools Required Tools Required Tools
Tool Part Number Part Description Qty
A 138-7573 Link Bracket 1
A 138-7575 Link Bracket 2
B 1P-0520 Driver Gp 1
C 188-1456 Metric Eyebolt 1
D 138-7575 Link Bracket 2
E 138-7575 Link Bracket 3
F 1P-0520 Driver Gp 1
F 8T-5096 Dial Indicator Gp 1
G 1P-1863 Retaining Ring Pliers 1
Note Cleanliness is an important factor. Before
assembly, all parts should be thoroughly 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 which
may cause later trouble. Inspect all parts. If
any parts are worn or damaged, use new parts for
replacement. Note Apply oil to all of the
bearings before assembly. 1. Check the condition
of the O-ring seals that are used in the torque
converter and torque converter housing. If any of
the seals are damaged, use new parts for
replacement.
30
Thank you very much for your reading.
Please Click Here. Then Get COMPLETE MANUAL. NO
WAITING
GET MORE OTHER MANUALS
https//www.aservicemanualpdf.com/

• 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/
31
Illustration 1 g00674989 2. Install five O-ring
seals (96) and three plugs (97).
Illustration 2
g00674987
3. Install block (95) and four bolts (94).
Illustration 3 g00674986 4. Install ring (93)
and two bearings (92) to idler gear assembly (91).
32
Illustration 4
g00675821
5. Install idler gear assembly (91).
Illustration 5
g00675822

1. Install idler gear shaft (90).
2. Install bolt (89) and the washer.

Illustration 6
g00674982
8. Install O-ring seal (88) to cover (87).
33
Illustration 7
g00675823
9. Install three bolts (86) and cover 87.

• Illustration 8 g00675717
• Use the proper equipment in order to handle
  bearing cup (85).
• Lower the temperature of bearing cup (85).
• Install bearing cup (85) into the housing.

Illustration 9 g00675718 13. Use the proper
equipment to handle bearing (83).
34
https//www.aservicemanualpdf.com/ My Dear
Friend! Thank you very much for visiting. Full
manual if required, please enter the following
URL into your browser. https//www.aservicemanual
pdf.com/