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 794 of 1258

TM 9-2320-280-34
17 - 6.
OIL PUMP REPAIR (3L80)
This task covers:
a.
Disassembly
c.
Inspection
b.
Cleaning
d.
Assembly
INITIAL SETUP:
Applicable Models
Materials/Parts
All vehicles except: M997A2, M1025A2,
Two oil ring seals (Appendix E, Item 190)
M1035A2, M1043A2, M1045A2, M1097A2
O-ring seal (Appendix E, Item 184)
Oil seal (Appendix E, Item 187)
Tools
Sealing compound (Appendix B, Item 47)
General mechanic's tool kit:
Transmission fluid (Appendix B, Item 23)
automotive (Appendix G, Item 1)
Manual References
Special Tools
TM 9-2320-280-24P
Slide hammer adapter (Appendix G, Item 32)
Bushing service set (Appendix G, Item 33)
Equipment Condition
Driver handle (Appendix G, Item 34)
Transmission disassembled into subassemblies
Oil pump seal installer (Appendix G, Item 39)
(para. 17-3).
Maintenance Level
General support
NOTE
Work area should be well ventilated, clean, and free from blowing
dirt and dust.
a. Disassembly
CAUTION
Pressure regulator is spring loaded.
1.
Remove snapring (11), boost valve bushing (12), boost valve (13), pressure regulator spring (14),
regulator valve (17), spring retainer (15), and spacer(s) (16) from pump cover (4).
2.
Remove oil pump O-ring seal (1) from pump cover (4). Discard O-ring seal (1).
3.
Remove two oil ring seals (2) and selective washer (3) from pump cover (4). Discard oil seal rings (2).
4.
Remove five capscrews (18) and pump cover (4) from pump body (7).
5.
Mark drive gear (5) and driven gear (6) for assembly.
6.
Remove drive gear (5), driven gear (6), and oil seal (9) from pump body (7). Discard oil seal (9).
b. Cleaning
Clean all oil pump components in accordance with para. 2-13.
c. Inspection
NOTE
For general inspection instructions, refer to para. 2-14.
1.
Inspect gear pockets (10), crescent (8), drive gear (5), driven gear (6), and pump body (7) for scoring,
galling, or damage. Replace oil pump if any parts are scored, galled, or damaged.
2.
Place drive gear (5) and driven gear (6) in pump body (7).
3.
Check pump body (7) to drive gear (5) face and driven gear (6) face clearance using a straight edge
d feeler gauge. Clearance should be 0.0008-0.0035 inch (0.02-0.09 mm). If clearance does not meet
specifications, replace oil pump.
17-16


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