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 860 of 1258

TM 9-2320-280-34
1 7 - 8 0
Change 1
1 7 - 1 6 . TRANSMISSION CASE REPAIR (4L80-E)
This task covers:
a.
Cleaning
b.
Inspection
a. Cleaning
NOT E
For general inspection procedures, refer to para. 2-14.
1.
Inspect all oil passages and bores for cracks, leaks, holes, and burrs. Use soft stone or crocus cloth to
remove burrs.
2.
Use helicoils to repair damaged threads.
3.
Inspect bores for holes or pits as leakage paths. Replace transmission case (1) if holes or pits are
present.
4.
Inspect anchor pins (4) for looseness. Replace anchor pins (4) if damaged or loose.
5.
Inspect internal splines, lugs, and snapring grooves for cracks, breaks, and burrs. Repair minor
burrs. Replace damaged transmission case (1).
6.
Remove retaining ring (7) and replace seal assembly (6) using seal installer.
7.
Inspect plugs (5), cooler fittings (2), and vent pipe (3). Replace damaged parts.
8.
Inspect oil multilip seal (8) for damage. Replace if damaged.
9.
Inspect bolt holes (9) for damage. Replace transmission case (1) if holes (9) are damaged.
b. Inspection
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 (Appendix G, Item 39)
Manual References
TM 9-2320-280-24P
1.
Remove transmission case (1) from transmission holding fixture.
________
WARNING
________
When steam cleaning, protective clothing must be used. Failure to do this may
cause serious injury.
2.
Thoroughly steam clean transmission case (1).
________
WARNING
________
Compressed air used for cleaning purposes will not exceed 30 psi (207 kPa). Use
only with effective chip guarding and personal protective equipment
(goggles/shield, gloves, etc.).
3.
Blow all dirt and cleaning solution from transmission case (1) with compressed air.
NOT E
Work area should be well-ventilated, clean, and free from blowing dirt and dust.
Equipment Condition
Transmission disassembled into subassemblies
(para. 17-14).
General Safety Instructions
______________________
• Protective clothing must be used when steam
cleaning.
• Compressed air for cleaning purposes will not
exceed 30 psi (207 kPa).
Maintenance Level
_______________
General support


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