TM-9-2320-280-34

TRUCK, UTILITY: M998 SERIES

TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE

JANUARY 1996
TM-9-2320-280-34

  TM-9-2320-280-34 - Page 910 of 1258

TM 9-2320-280-34
1 7 - 1 2 4
Change 1
1 7 - 2 9 . OIL PUMP ASSEMBLY REPAIR (4L80-E)
Materials/Parts
Two seal rings (Appendix E, Item 175)
Seal (Appendix E, Item 174)
Oil pump seal (Appendix E, Item 189)
Petrolatum (Appendix B, Item 38)
Transmission fluid (Appendix B, Item 24)
Equipment Condition
Transmission disassembled into
subassemblies (para. 17-14).
Maintenance Level
General support
This task covers:
a.
Disassembly
c.
Inspection
b.
Cleaning
d.
Assembly
Clean all components in accordance with para. 2-13.
b. Cleaning
a. Disassembly
1.
Remove oil pump seal (30) from pump body (1). Discard oil pump seal (30).
NOT E
• Before removal, mark pump body and cover for assembly.
• Vent shield is used on 1997-1998 transmissions only.
2.
Remove five screws (5) and vent shield (4.1) from cover (4) and pump body (1). Separate pump
body (1) and cover (4).
3.
Remove seal (2) from pump body (1). Discard seal (2).
NOT E
Before removal, mark gear faces for assembly.
4.
Remove drive gear (3) and driven gear (6) from pump body (1).
CAUTION
Pressure regulator valve is spring-loaded.
5.
Remove snapring (19) from cover (4) and release tension.
6.
Remove bushing (18), reverse boost valve (17), spring retainer (16), two springs (15), pressure
regulator valve (14), spring pin (11), and plug (12) from cover (4).
7.
Remove spring pin (26), plug (29), spring (28), and converter limit valve (27) from cover (4).
8.
Remove spring retainer (7), spring (8), and converter enable valve (9) from cover (4).
9.
Remove snapring (20), plug (21), converter clutch valve (22), spring (23), spring pin (25), and
plug (10) from cover (4).
10.
Remove two seal rings (24) from cover (4). Discard seal rings (24).
11.
Remove front selective thrust washer (13) from cover (4).
INITIAL SETUP:
Applicable Models
M997A2, M1025A2, M1035A2,
M1043A2, M1045A2, M1097A2, M1123
Tools
General mechanic’s tool kit:
automotive (Appendix G, Item 1)
Special Tools
Seal installer/pusher/sizer
(Appendix G, Item 51)
Oil pump seal installer (Appendix G, Item 39)
Manual References
TM 9-2320-280-24P
NOT E
Work area should be well-ventilated, clean, and free from blowing dirt and dust.


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