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3P8074 TORQUE CONVERTER GROUP--With Housing Serial No. 50W3101 to 50W5359 inclusive and Torque Converter Serial No. 23T6675 to 23T9850 inclusive. 7G7663 Torque Converter parts are shown on Page 111B 988B


POWER TRAIN
TORQUE CONVERTER GP
TRANSMISSION GP
CONTROL GP-TORQUE CONVERTER
TRANSMISSION GP
CONTROL GP-TRANSMISSION HYD

WHEEL LOADER 988B WHEEL LOADER 50W
 988B WHEEL LOADER 50W00001-06040 (MACHINE) POWERED BY 3408 ENGINE SEBP1079 988B 50W   (1976)

POWER TRAIN

TORQUE CONVERTER GP
TORQUE CONVERTER GP
3P-8074 TORQUE CONVERTER GP
TORQUE CONVERTER GP
3P-8074 TORQUE CONVERTER GP
TORQUE CONVERTER GP
3P-8074 TORQUE CONVERTER GP
TORQUE CONVERTER GP
8P-5095 TORQUE CONVERTER GP
TORQUE CONVERTER GP
8P-5095 TORQUE CONVERTER GP
TORQUE CONVERTER GP
7G-7663 TORQUE CONVERTER GP
TORQUE CONVERTER GP
3T-5098 TORQUE CONVERTER GP
 

#SEBP10790370
 

3P-8074: TORQUE CONVERTER GP

3P8074 TORQUE CONVERTER GROUP--With Housing
Serial No. 50W3101 to 50W5359 inclusive and Torque Converter Serial No.
23T6675 to 23T9850 inclusive. 7G7663 Torque Converter parts are shown on Page 111B
c172131 SEBP1079
3P8074 TORQUE CONVERTER GP Parts scheme
  For full view, you need register

Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 7G-7663 YC [1] TORQUE CONVERTER GROUP  
    (Separate Illustration)
2. 4H-6730 [1] SEAL  
3. 0S-1585 [11] BOLT  
4. 7B-3235 [11] BOLT  
5. 3B-4508 [22] LOCKWASHER  
6. 1A-2029 [10] BOLT  
7. 8S-5820 [1] BREATHER  
8. 5D-6535 [1] COVER  
  4D-8621 [1] GASKET  
9. 1F-2771 [1] BEARING  
10. 5P-0713 C [1] SEAL  
11. 7G-2608 C [1] SHAFT  
12. 4S-5838 [1] RETAINER  
13. 0L-1558 [1] BOLT  
14. 1P-7521 [1] YOKE  
15. 8P-2934 [1] CARRIER  
16. 5S-0927 [1] SLEEVE  
17. 8M-8282 [1] SEAL  
18. 5S-0928 [1] CARRIER  
  1M-3937 [1] RING  
19. 4S-5898 [1] SEAL  
20. 8L-3017 [2] SEAL  
21. 2P-5806 [1] COVER  
22. 3B-4506 [11] LOCKWASHER  
23. 6P-8340 [1] SLEEVE  
24. 6P-8339 [1] LOCK  
25. 0L-1351 [1] BOLT  
26. 8M-4433 [2] SEAL  
  C   INDICATES CHANGE
  Y   SEPARATE ILLUSTRATION
 

#SEBP10790371
 

3P-8074: TORQUE CONVERTER GP

3P8074 TORQUE CONVERTER GROUP--With Housing
Serial No. 50W5360-Up and Torque Converter Serial No. 23T9851-Up
3T5098 Torque Converter parts are shown on Page 111C
c180754 SEBP1079
3P8074 TORQUE CONVERTER GP Parts scheme
  For full view, you need register

Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 3T-5098 CY [1] TORQUE CONVERTER GROUP  
    (Separate Illustration)
2. 4H-6730 [1] SEAL  
3. 0S-1585 [11] BOLT  
4. 7B-3235 [11] BOLT  
5. 3B-4508 [22] LOCKWASHER  
6. 1A-2029 [10] BOLT  
7. 8S-5820 [1] BREATHER  
8. 5D-6535 [1] COVER  
  4D-8621 [1] GASKET  
9. 1F-2771 [1] BEARING  
10. 5P-0713 [1] SEAL  
11. 7G-2608 [1] SHAFT  
12. 4S-5838 [1] RETAINER  
13. 0L-1558 [1] BOLT  
14. 1P-7521 [1] YOKE  
15. 8P-2934 [1] CARRIER  
16. 5S-0927 [1] SLEEVE  
17. 8M-8282 [1] SEAL  
18. 5S-0928 [1] CARRIER  
  1M-3937 [1] RING  
19. 4S-5898 [1] SEAL  
20. 8L-3017 [2] SEAL  
21. 2P-5806 [1] COVER  
22. 3B-4506 [11] LOCKWASHER  
23. 6P-8340 [1] SLEEVE  
24. 6P-8339 [1] LOCK  
25. 0L-1351 [1] BOLT  
26. 8M-4433 [2] SEAL  
  C   INDICATES CHANGE
  Y   SEPARATE ILLUSTRATION
 

#SEBP10790372
 

8P-5095: TORQUE CONVERTER GP

8P5095 BASIC TORQUE CONVERTER GROUP
Serial No. 50W1 to 1591, 1596 to 1607, 1620, 1621, 1624, 1631, 1635, 1640, 1642 to 50W1644 inclusive
Torque Converter Serial No. 23T1 to 23T5028 inclusive
Part of 3P8074 Torque Converter Group shown on Page 110
c159388 SEBP1079
8P5095 TORQUE CONVERTER GP Parts scheme
  For full view, you need register

Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 8P-4540 [1] CARRIER ASSEM.  
    (Includes)
2. 1T-0577 [1] BEARING  
3. 2P-5693 [1] HOUSING  
4. 2P-5725 [1] PLATE  
5. 1A-9579 [36] BOLT  
6. 9M-1974 [60] WASHER  
7. 1S-7347 [1] RING  
8. 8S-3373 [1] RING  
9. 6P-8921 [1] COVER  
10. 1T-0414 [4] BOLT  
11. 1D-4703 [6] BOLT  
  4S-9191 [6] WASHER  
12. 2P-9314 [1] DISC ASSEM.  
13. 2P-6967 [1] CARRIER ASSEM.  
    (Includes)
  4B-9880 [2] BALL  
14. 3P-3743 [1] RING  
15. 6P-1047 [1] CARRIER  
  3P-3672 [2] RING  
16. 3H-9675 [1] PIN  
17. 2P-5714 [1] HUB  
18. 2P-5851 [1] IMPELLER  
19. 3P-4155 [1] PISTON  
20. 3P-8963 [1] PLATE (serial no.)  
  4B-4158 [2] SCREW  
21. 2B-2695 [20] BOLT  
22. 8P-5098 [1] HOUSING ASSEM.  
    (Includes)
23. 2P-6875 [1] BEARING  
24. 4M-8871 [3] DOWEL  
25. 2P-5717 [1] SLEEVE  
26. 2P-9335 [1] RING  
27. 2P-5783 [1] IMPELLER  
28. 1T-0763 [1] RACE  
29. 1T-1078 [1] BEARING  
30. 1T-0762 [1] RACE  
31. 2P-5680 [1] TURBINE  
32. 8P-0769 [1] HUB  
33. 2P-9183 [1] COVER ASSEM.  
    (Includes)
34. 1T-0577 [1] BEARING  
35. 1T-0686 [4] RACE  
36. 1T-0655 [2] BEARING  
37. 0S-1594 [20] BOLT  
  5M-2894 [20] WASHER  
38. 1T-0651 [2] RING  
39. 2P-5702 [1] STATOR  
 

#SEBP10790373
 

8P-5095: TORQUE CONVERTER GP

8P5095 BASIC TORQUE CONVERTER GROUP
Serial No. 50W1592 to 1595, 1608 to 1619, 1622, 1623, 1625 to 1630, 1632 to 1634, 1636 to 1639, 1641 and 50W1645 to
50W3100 inclusive. Torque Converter Serial No. 23T5029 to 23T6674 inclusive. Part of 3P8074 Torque Converter Group shown on
Page 110. For Field Replacement of 8P9302 order 3T5989 shown on Page 111D
c217830 SEBP1079
8P5095 TORQUE CONVERTER GP Parts scheme
  For full view, you need register

Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 8P-4540 [1] CARRIER ASSEM.  
    (Includes)
2. 1T-0577 [1] BEARING  
3. 2P-5693 [1] HOUSING  
4. 2P-5725 [1] PLATE  
5. 1A-9579 [36] BOLT  
6. 9M-1974 [60] WASHER  
7. 1S-7347 [1] RING  
8. 8S-3373 [1] RING  
9. 6P-8921 [1] COVER  
10. 1T-0414 [4] BOLT  
11. 9K-7788 C [6] BOLT  
  4S-9191 [6] WASHER  
12. 2P-9314 [1] DISC ASSEM.  
13. 8P-9299 C [1] CARRIER ASSEM.  
    (Includes)
14. 4B-9880 [2] BALL  
15. 2H-2255 [1] DOWEL  
16. 6P-7706 [1] CARRIER  
17. 3P-3743 [1] RING  
18. 2P-5851 [1] IMPELLER  
19. 3P-4155 [1] PISTON  
20. 3P-8963 [1] PLATE (serial no.)  
  4B-4158 [2] SCREW  
21. 2B-2695 [20] BOLT  
22. 8P-9302 C [1] HOUSING ASSEM.  
    (Includes)
23. 2P-6875 [1] BEARING  
24. 4M-8871 [3] DOWEL  
25. 2P-5714 [1] HUB  
26. 2P-9335 [1] RING  
27. 2P-5783 [1] IMPELLER  
28. 1T-0763 [1] RACE  
29. 1T-1078 [1] BEARING  
30. 1T-0762 [1] RACE  
31. 2P-5680 [1] TURBINE  
32. 8P-0769 [1] HUB  
33. 2P-9183 [1] COVER ASSEM.  
    (Includes)
34. 1T-0577 [1] BEARING  
35. 1T-0686 [4] RACE  
36. 1T-0655 [2] BEARING  
37. 0S-1594 [20] BOLT  
  5M-2894 [20] WASHER  
38. 1T-0651 [2] RING  
39. 2P-5702 [1] STATOR  
40. 3P-3672 [2] RING  
  C   INDICATES CHANGE
 

#SEBP10790374
 

7G-7663: TORQUE CONVERTER GP

7G7663 TORQUE CONVERTER GROUP
Serial No. 50W3101 to 50W5359 inclusive and Torque Converter Serial No. 23T6675 to 23T9850 inclusive
Part of 3P8074 Torque Converter Group shown on Page 110A
c180755 SEBP1079
7G7663 TORQUE CONVERTER GP Parts scheme
  For full view, you need register

Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 8P-4540 [1] CARRIER ASSEM.  
    (Includes)
2. 1T-0577 [1] BEARING  
3. 2P-5693 [1] HOUSING  
4. 2P-5725 [1] PLATE  
5. 1A-9579 [36] BOLT  
6. 9M-1974 [60] WASHER  
7. 1S-7347 [1] RING  
8. 8S-3373 [1] RING  
9. 6P-8921 [1] COVER  
10. 1T-0414 [4] BOLT  
11. 7K-6058 [9] BOLT  
  3H-7654 [9] WASHER  
12. 2P-9314 [1] DISC ASSEM.  
13. 8P-9299 [1] CARRIER ASSEM.  
    (Includes)
14. 4B-9880 [2] BALL  
15. 2H-2255 [1] DOWEL  
16. 6P-7706 [1] CARRIER  
17. 3P-3743 [1] RING  
18. 2P-5851 [1] IMPELLER  
19. 3P-4155 [1] PISTON  
20. 3P-8963 [1] PLATE (serial no.)  
  4B-4158 [2] SCREW  
21. 2B-2695 [20] BOLT  
22. 7G-7659 [1] HOUSING ASSEM.  
    (Includes)
23. 2P-6875 [1] BEARING  
24. 4M-8871 [3] DOWEL  
25. 9G-1221 [1] HUB  
26. 2P-9335 [1] RING  
27. 3T-4713 C [1] IMPELLER  
28. 1T-0763 [1] RACE  
29. 1T-1078 [1] BEARING  
30. 1T-0762 [1] RACE  
31. 2P-5680 [1] TURBINE  
32. 8P-0769 [1] HUB  
33. 2P-9183 [1] COVER ASSEM.  
    (Includes)
34. 1T-0577 [1] BEARING  
35. 1T-0686 [4] RACE  
36. 1T-0655 [2] BEARING  
37. 0S-1594 [20] BOLT  
  5M-2894 [20] WASHER  
38. 1T-0651 [2] RING  
39. 2P-5702 [1] STATOR  
40. 8P-4922 C [2] RING  
  C   INDICATES CHANGE
 

#SEBP10790375
 

3T-5098: TORQUE CONVERTER GP

3T5098 TORQUE CONVERTER GROUP
Serial No. 50W5360-Up and Torque Converter Serial No. 23T9851-Up
Part of 3P8074 Torque Converter Group shown on Page 110B
c309158 SEBP1079
3T5098 TORQUE CONVERTER GP Parts scheme
  For full view, you need register

Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 8P-4541 [1] CARRIER-STATOR  
2. 1T-0577 C [2] BEARING-SLEEVE  
3. 2P-5693 [1] HOUSING-ROTATING  
4. 2P-5725 [1] PLATE-REACTION  
5. 1A-9579 [36] BOLT  
6. 9M-1974 [60] WASHER  
7. 1S-7347 [1] RING-SEAL  
8. 8S-3373 [1] RING-SEAL  
9. 6P-8921 [1] COVER  
10. 1T-0414 [4] BOLT-12 POINT HEAD  
11. 7K-6058 [9] BOLT-12 POINT HEAD  
  3H-7654 [9] WASHER  
12. 2P-9314 [1] DISC AS-CLUTCH  
13. 8P-9299 [1] CARRIER AS  
  8P-9300 [1] CARRIER-BEARING  
14. 4B-9880 [2] BALL  
15. 2H-2255 [1] DOWEL  
16. 6P-7706 [1] CARRIER-RING  
17. 3P-3743 [1] RING-RETAINING  
18. 3T-5102 [1] IMPELLER-CONVERTER  
19. 3P-4155 [1] PISTON-CLUTCH  
20. 8P-4922 [2] RING-SEAL  
21. 2B-2695 [20] BOLT  
22. 3T-4989 [1] HOUSING AS-CLUTCH  
23. 2P-6875 [1] BEARING-SLEEVE  
24. 1M-3151 [3] DOWEL-REACTION  
25. 3T-5100 [1] HUB-IMPELLER  
26. 2P-9335 [1] RING  
27. 3T-5103 [1] IMPELLER-CONVERTER  
28. 1T-0763 [1] RACE-BEARING-THRUST  
29. 1T-1078 C [1] BEARING-THRUST  
30. 1T-0762 C [1] RACE-THRUST  
31. 2P-5680 [1] TURBINE-CONVERTER  
32. 8P-0769 [1] HUB-TURBINE  
33. 2P-5715 [1] COVER  
34. 2P-5702 [1] STATOR-CONVERTER  
35. 1T-0686 C [4] RACE-BEARING-THRUST  
36. 1T-0655 C [2] BEARING-THRUST  
37. 0S-1594 [20] BOLT  
  5M-2894 [20] WASHER  
38. 1T-0651 [2] RING-RETAINER  
  C   CHANGE FROM PREVIOUS TYPE
 

#SEBP10790376
 

3T-5989: HOUSING AS-CLUTCH

3T5989 CLUTCH HOUSING ASSEMBLY--Field Installation
Serial No. 50W1592 to 1595, 1608 to 1619, 1622, 1623, 1625 to 1630, 1632 to 1634, 1636
to 1639, 1641 and 50W1645 to 50W3100 inclusive. NOTE: Provides service
replacement for 8P9302 shown on Page 111A
c182316 SEBP1079
3T5989 HOUSING AS-CLUTCH Parts scheme
  For full view, you need register

Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 3T-5988 [1] HOUSING  
2. 2P-6875 [1] BEARING  
3. 1M-3151 [3] DOWEL  
 

#SEBP10790377
 

1V-4902: CONTROL GP-TORQUE CONVERTER

1V4902 TORQUE CONVERTER CONTROL GROUP
c210321 SEBP1079
1V4902 CONTROL GP-TORQUE CONVERTER Parts scheme
  For full view, you need register

Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 9K-6936 [1] LEVER  
2. 5M-8500 [1] KNOB  
3. 9K-4068 [1] CONTROL  
4. 9K-4069 [1] LEVER  
5. 0S-1617 [2] BOLT  
  1D-4716 [2] NUT  
  3B-4505 [2] LOCKWASHER  
6. 1B-4201 [1] NUT  
7. 3B-4504 [7] LOCKWASHER  
8. 8S-7048 [1] ROD END  
9. 9K-6232 [1] CABLE  
10. 9F-7022 [3] BOLT  
11. 2V-2938 [1] PLATE  
  2V-2937 [1] SEAL  
  1B-7904 [2] SPACER  
12. 8B-9889 [1] CLIP  
13. 7D-0874 [2] TIE  
14. 6F-0612 [5] NUT  
15. 1B-4427 [2] NUT  
16. 9K-6066 [1] ANGLE  
17. 6F-7027 [4] BOLT  
18. 0S-1570 [2] BOLT  
  2L-9038 [2] NUT  
 

#SEBP10790378
 

3P-9094: TRANSMISSION AR

3P9094 TRANSMISSION ARRANGEMENT
IF TRANSMISSION IS SERIALIZED, USE TRANSMISSION SERIAL NO. OTHERWISE, USE
VEHICLE SERIAL NO. Vehicle Serial No. 50W1 to 50W6040 inclusive. Transmission
Serial No. 2MA1-Up. 6P5139 Transmission Hydraulic Control, 3P3057 Planetary
Transmission, 3P3473 Transfer Gear, 3P2875 Transfer Case and Gear and 3P3474
Transfer Case and Covers parts are shown on Pages 114 and 120 through 126A
c209821 SEBP1079
3P9094 TRANSMISSION AR Parts scheme
  For full view, you need register

Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 3P-2875 [1] TRANSFER CASE AND GEAR GROUP  
2. 3P-3474 [1] CASE AND COVERS GROUP  
3. 6P-5139 [1] TRANSMISSION HYDRAULIC CONTROL GROUP  
4. 3P-3473 [1] TRANSFER GEAR GROUP  
5. 3P-3057 Y [1] PLANETARY GROUP  
    (Separate Illustration)
6. 6P-2514 [1] COVERS GROUP  
    (Shipping & Storage-Includes Covers Gaskets, and Hardware)
  Y   SEPARATE ILLUSTRATION
 

#SEBP10790379
 

6P-5139: CONTROL GP-TRANSMISSION HYD

6P5139 TRANSMISSION HYDRAULIC CONTROL GROUP
IF TRANSMISSION IS SERIALIZED, USE TRANSMISSION SERIAL NO. OTHERWISE, USE VEHICLE SERIAL NO.
Vehicle Serial No. 50W1 to 50W4353 inclusive. Transmission Serial No. 2MA1-Up. Part of 3P9094 Transmission
Arrangement shown on Page 113. 6P5140 Control Valve parts are shown on Pages 115 & 115A
c209813 SEBP1079
6P5139 CONTROL GP-TRANSMISSION HYD Parts scheme
  For full view, you need register

Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 8M-4432 [4] SEAL-O-RING  
2. 6P-4977 [2] SLEEVE  
3. 6P-5140 Y [1] VALVE GP-CONTROL  
4. 6B-1557 [4] BOLT  
  5M-2894 [4] WASHER  
5. 3J-7354 [1] SEAL-O-RING  
6. 6P-4975 [1] ADAPTER-STRAIGHT THREAD  
  3D-2824 [1] SEAL-O-RING  
7. 4B-8710 [1] SPRING  
8. 3P-0647 [2] SEAL-O-RING  
9. 6P-4979 [1] SLEEVE  
10. 8L-5922 [1] BOLT-SELF LOCKING  
  4F-3714 [1] WASHER  
  Y   SEPARATE ILLUSTRATION
 

Information:

Caterpillar Parts SIS Catalog 988B :

TORQUE CONVERTER GP
3P-8074 TORQUE CONVERTER GP
SHUTOFF GP-ELECTRICAL
2W-0103 SHUTOFF GP-ELECTRICAL
SHUTOFF GP-SOLENOID
7N-9129 SHUTOFF GP-SOLENOID
SHUT-OFF GP-SOLENOID
6N-4201 SHUT-OFF GP-SOLENOID
SHUT-OFF GP-ELECTRIC
4N-3402 SHUT-OFF GP-ELECTRIC
SHUT-OFF GP-ELECTRIC
4N-3402 SHUT-OFF GP-ELECTRIC
BACK-UP WARNING GROUP
7V-5303 BACK-UP WARNING GROUP
ELECTRIC HORN GROUP
1V-5138 ELECTRIC HORN GROUP
TORQUE CONVERTER GP
3P-8074 TORQUE CONVERTER GP
TORQUE CONVERTER GP
8P-5095 TORQUE CONVERTER GP
TORQUE CONVERTER GP
8P-5095 TORQUE CONVERTER GP
TORQUE CONVERTER GP
7G-7663 TORQUE CONVERTER GP
TORQUE CONVERTER GP
3T-5098 TORQUE CONVERTER GP
HOUSING AS-CLUTCH
3T-5989 HOUSING AS-CLUTCH
CONTROL GP-TORQUE CONVERTER
1V-4902 CONTROL GP-TORQUE CONVERTER
TRANSMISSION AR
3P-9094 TRANSMISSION AR

Truck sale:

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Caterpillar 988B
- Wheel Loaders
N C MACHINERY CO.
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TOROMONT CAT
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CGT - COMPAGNIA GENERALE TRATTORI
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Caterpillar 988B, Wheel Loaders, Construction
 
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CGT - COMPAGNIA GENERALE TRATTORI
Italy
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