Caterpillar Cat 988H Wheel Loader (Prefix BXY) Service Repair Manual (BXY00001 and up)

1
Service Repair Manual
Models 988H Wheel Loader
2
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Product WHEEL LOADER Model 988H WHEEL LOADER
BXY Configuration 988H Wheel Loader BXY00001-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 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 138-7575 Link Bracket 3
H 1P-0520 Driver Gp 1
J 8T-5096 Dial Indicator Gp 1
J 4C-4030 Loctite -
3
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).
4
Illustration 4
g00663626
4. Install idler gear assembly (80).
Illustration 5 If equipped with this style lube
adapter.
g03410201
Illustration 6 If equipped with this style lube
adapter.
g03410188
5. Install lube adapter (79b), (79a). Use Tooling
(J) on threads of (79b) and (79a).
5
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).
6
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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).
8
Illustration 13 g00663276 12. Install adapter
(69) into gear assembly (66). Install retaining
ring (68).
Illustration 14 g01153379 13. Lower the
temperature of bearing cone (67). Install bearing
cone (67) onto gear assembly (66).
Illustration 15
g00663265
14. Install gear assembly (66).
9
Illustration 16 g00663261 15. Lower the
temperature of bearing cup (64). Install bearing
cup (64). Do not install seal (65) into adapter
(62) at this time.

• Illustration 17 g00663257
• Do NOT install O-ring seals (63) onto adapter
  (62) at this time.
• If both pump drive adapters were removed, repeat
  Steps 9 through 16 for the other pump drive
  adapter.

Illustration 18
g00663256
10
18. Attach Tooling (F) and a suitable lifting
device to adapter (62). The weight of adapter
(62) is approximately 30 kg (65 lb). Install
adapter (62).
Illustration 19 g00663255 19. Install bolts
(61). Tighten bolts (61) to a torque of 240 40
Nm (177 30 lb ft).
Illustration 20 g01153385 20. Use Tooling (J)
and Tooling (H) to check bearing end play. The
correct bearing end play is 0.150 0.050 mm
(.006 .002 inch). Add or remove shims (73), as
required. Once the proper end play is reached,
remove adapter (62).
Illustration 21
g00663261
11
21. Install seal (65) into adapter (62) at this
time. Bearing (64) was previously installed.
Lubricate seal (65) with oil.
Illustration 22 g00663257 22. Install O-ring
seals (63) onto adapter (62). Lubricate seals
(63) with oil.
Illustration 23 g00663256 23. Attach Tooling (F)
and a suitable lifting device to adapter (62).
The weight of adapter (62) is approximately 30 kg
(65 lb). Install adapter (62).
Illustration 24
g00663255
12

1. Install bolts (61). Tighten bolts (61) to a
   torque of 240 40 Nm (177 30 lb ft).
2. Check the bearing end play. The correct bearing
   end play is 0.150 0.050 mm (.006 .002 inch).
   Repeat Steps 18 through 24, if necessary.

Illustration 25
g00663101
Illustration 26
g00663781

1. Place stator (27) in a suitable press.
2. Install adapter (60) into stator (27). Install
   retaining ring (59).

Illustration 27
g00663100
13
28. Install plate (58) into stator (27). Install
retaining ring (57). Repeat this procedure for
the opposite side.

• Illustration 28 g01153467
• Raise the temperature of bearing (56). Install
  bearing (56) onto outer shaft (51). Allow the
  bearing (56) and the outer shaft to reach a
  uniform temperature.
• Note Note the location of the two holes in the
  side of seal carrier (55). Make sure that one
  hole is aligned with the oil passage on shaft
  (51). Make sure that the remaining hole is in
  alignment with the hole that is provided for the
  installation of the locating pin. Failure to
  align the oil passages in seal carrier (55) and
  shaft (51) will result in failure of the
  components.
• Raise the temperature of seal carrier (55).
  Install seal carrier (55) onto outer shaft (51).

Illustration 29 g00663096 31. Use a hammer and a
punch to install pin (54) into outer shaft
assembly (51).
14

• Illustration 30 g01153481
• Raise the temperature of seal carrier (53).
  Install seal carrier (53) onto inner shaft (50).
• Raise the temperature of bearing (52). Install
  bearing (52) onto inner shaft (50). Allow inner
  shaft (50) and bearing (52) to reach a uniform
  temperature. Use a hammer and a suitable punch to
  reset bearing (52). Ensure that bearing (52) is
  seated correctly.

• Illustration 31 g01153486
• Install inner shaft (50) into outer shaft (51).
  Install seal (47).
• Install seals (48) and install ring (49) onto the
  shaft assembly.

Illustration 32
g00662877
15
36. Install the ring seal into sleeve (45).
Install sleeve (45) and install bolts (44).
Tighten bolts (44) to a torque of 30 5 Nm (22
4 lb ft).
Illustration 33 g00662873 37. Raise the
temperature of bearing cup (43). Install bearing
cup (43) into gear (42) by using Tooling (H).
Illustration 34 g00662872 38. Install gear (42)
onto housing assembly (39). Install bolts (41).
Tighten bolts (41) to a torque of 104 15 Nm
(77 11 lb ft).
16
Illustration 35 g00662871 39. Use two persons to
install housing assembly (39) from shaft assembly
(40). The weight of housing assembly (39) is
approximately 45 kg (100 lb).
Illustration 36
g00662869
40. Install piston (38).
Illustration 37 g00662868 41. Install two
friction discs (37) and one wear plate.
Illustration 38
g00662867
17
42. Install plate (36). Install two bolts (14) on
the underside of plate (36).
Illustration 39 g00662866 43. Install impeller
(31) onto adapter assembly (35). Install bolts
(34) and the washers. Tighten bolts (34) to a
torque of 104 15 Nm (77 11 lb ft).
Illustration 40 g00662864 44. Lower the
temperature of bearing cup (33). Use Tooling (H)
to install bearing cup (33) into impeller (31).
Illustration 41
g03389696
18
45. Install ring (32d), plate (32c), bearing
(32b), and plate (32a).
Illustration 42 g00662862 46. Use two persons to
install impeller (31). The weight of impeller
(31) is approximately 30 kg (65 lb). Install
retaining ring (30).

• Illustration 43 g00662860
• Install the plate and the ring below the bearing
  (29).
• Install spacer (28). Install bearing (29).

Illustration 44
g00662858
19
49. Install stator (27) and install retaining
ring (26).
Illustration 45 g00662857 50. Place torque
converter assembly on suitable cribbing, as shown.

• Illustration 46 g01152220
• Install hub (25) into turbine (17). Install plate
  (24).
• Install bolts (23) and the washers into turbine
  (17). Tighten bolts (23) to a torque of 104 15
  Nm (77 11 lb ft).

Illustration 47
g01152217
20
53. Remove O-ring seal (21) and two plugs (22)
into housing (20). Invert housing (20).
Illustration 48
g00660859
54. Install bearing cup (19).
Illustration 49 g00660858 55. Install the ring
and the plate below bearing assembly (18).
Install bearing assembly (18). Install the plate
onto bearing assembly (18).
Illustration 50
g00660856
56. Install turbine (17).
21
Illustration 51 g00660854 57. Install the ring
and the plate below bearing assembly (16).
Install bearing assembly (16).

• Illustration 52 g00660851
• Install Tooling (B) and a suitable lifting device
  to carrier assembly (15). The weight of carrier
  assembly (15) is approximately 160 kg (350 lb).
• Install carrier assembly (15) and the shaft as a
  unit.

Illustration 53
g00665426
22
Illustration 54 g00665427 60. Install bolts
(14). Tighten bolts (14) to a torque of 60 7
Nm (44 5 lb ft). Bolts (13) were previously
installed.
Illustration 55
g00660849

1. Install gasket (10).
2. Install O-ring seals (11) and (12).

Illustration 56
g00660847
63. Install seal (9) into retainer (8).
23

• Illustration 57 g01152195
• Install Tooling (A) and a suitable lifting device
  to the housing assembly. The weight of the
  housing assembly is approximately 285 kg (630
  lb).
• Use Tooling (G) to install the housing assembly
  onto the torque converter.

Illustration 58
g00665412
66. Install bolts (6) and the washers.
Illustration 59
g00665411
67. Install O-ring seal (4) and yoke (5).
24
Illustration 60 g00665406 68. Install bolt (2)
and retainer (3). Tighten bolt (2) to a torque of
240 25 Nm (177 18 lb ft).

• Illustration 61 g00660840
• Place the torque converter assembly (1) on
  suitable cribbing, as shown. The weight of torque
  converter assembly (1) is approximately 545 kg
  (1200 lb).
• End By
• Install the modulating valve for the torque
  converter impeller clutch. Refer to Disassembly
  and Assembly, "Modulating Valve (Torque
  Converter Impeller Clutch) - Install".
• Install the torque converter outlet relief valve.
  Refer to Disassembly and Assembly, "Relief Valve
  (Torque Converter Outlet) - Install".
• Install the transmission oil pump. Refer to
  Disassembly and Assembly, "Transmission Oil Pump
  - Install".
• Install the torque converter. Refer to
  Disassembly and Assembly, "Torque Converter -
  Install".

Copyright 1993 - 2021 Caterpillar Inc. All Rights
Reserved. Private Network For SIS Licensees.
Wed Feb 10 234437 UTC0800 2021
25
Shutdown SIS
Previous Screen
Product WHEEL LOADER Model 988H WHEEL LOADER
BXY Configuration 988H Wheel Loader BXY00001-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
i05831615
Torque Converter (Lockup) - Disassemble SMCS -
3101-015-L7 S/N - A7A1-UP S/N -
BXY1-UP 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 4C-5653 Threaded Adapter 2
B 5F-7369 Puller Leg 2
B 6B-6682 Full Nut 2
B 1A-1935 Full Nut 1
B 3H-0455 Puller 4
B 8S-6586 Forcing Screw 1
B 9S-7338 Crossblock 1
C 188-1456 Metric Eyebolt 1
D 138-7575 Link Bracket 2
E 138-7575 Link Bracket 3

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5F-7366 Screw 1
3H-0465 Plate 2
1P-5546 Crossblock 1
F 5H-7369 Puller Leg 2
8B-7551 Bearing Puller 1
6B-6682 3/4" - 16 NF Nut 2
1P-0520 Driver Gp 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
K 1P-1863 Retaining Ring Pliers 1
L - Forcing Screw M12 x 1.75 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.

27
Illustration 1 g00673844 1. Place the torque
converter assembly on suitable cribbing. The
weight of the torque converter assembly is
approximately 726 kg (1600 lb).
Illustration 2
g00660841
2. Remove speed sensor (1) .
Illustration 3
g00665406
28
3. Remove bolt (2) and retainer (3) .
Illustration 4
g00665411
4. Remove O-ring seal (4) and yoke (5) .
Illustration 5
g00665412
5. Remove bolts (6) and the washers.
29

• Illustration 6 g01142049
• Install Tooling (A) and a suitable lifting device
  to housing assembly (7) .
• Use Tooling (L) in order to separate housing
  assembly (7) from the torque converter. Remove
  housing assembly (7) . The weight of housing
  assembly (7) is approximately 285 kg (630 lb).

Illustration 7
g01142052
8. Remove bolts (8) and retainer (9) .
Illustration 8
g01142056
9. Remove seal (10) from retainer (9) .
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Illustration 9
g01142060

1. Remove gasket (11) .
2. Remove O-ring seals (12) .

Illustration 10
g00673879
Illustration 11 g00673880 12. Position torque
converter assembly onto the side, as shown.
31
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32
13. Remove bolts (13) and cover (14) .
Illustration 12 g03688995 14. Remove bolts (15)
, retainer (16) , and washer (17) . Remove plug
(17A) .
Illustration 13 g01142074 15. Use Tooling (B) in
order to push shaft assembly (18) out of the
bearing.
33

• Illustration 14 g00673883
• Position torque converter assembly upright, as
  shown.
• Install Tooling (C) and a suitable lifting device
  to shaft assembly (18) . The weight of shaft
  assembly (18) is approximately 17 kg (38 lb).
• Remove shaft assembly (18) .

Illustration 15
g01142092
Illustration 16 g00673886 19. Remove seal rings
(21) from seal carrier (20) . Use a suitable
press in order to remove bearing (19) and seal
carrier (20) from shaft assembly (18) .
34
Illustration 17
g01142102
Illustration 18 g01142105 20. Remove bolts (22)
and the washers. Do not remove two bolts (23) at
this time.
Illustration 19 g01142115 21. Attach a suitable
lifting device and Tooling (D) to carrier
assembly (24) . The weight of carrier assembly
(24) is approximately 132 kg (290 lb).
35
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Friend! Thank you very much for visiting. Full
manual if required, please enter the following
URL into your browser. https//www.aservicemanual
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