TM-9-2320-280-34
TRUCK, UTILITY: M998 SERIES
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
JANUARY 1996
TM-9-2320-280-34 - Page 874 of 1258
1 7 - 2 0 . CENTER SUPPORT REPAIR (4L80-E)
This task covers:
a.
Disassembly
c.
Inspection
b.
Cleaning
d.
Assembly
NOTE
Work area should be well-ventilated, clean, and free from blowing
dirt and dust.
1.
Remove four oil seal rings (1) from center support (2). Discard oil seal rings (1).
2.
Using adapter and clutch spring compressor J23327-1, compress spring and retainer (9) and remove
snapring (5) from center support (2).
3.
Remove spring and retainer (9) and clutch piston (6) from center support (2).
4.
Remove inner piston seal (7) and outer piston seal (8) from clutch piston (6). Discard piston seals (7)
and (8).
NOTE
Perform step 5 for 1997-1998 transmissions only.
5.
Remove oil cooler pipe fitting seal (8.1) from center support (2).
Clean all center support components in accordance with para. 2-13.
NOTE
For general inspection instructions, refer to para. 2-14.
1.
Inspect roller clutch inner race (3) for damage. Replace center support (2) if damaged.
2.
Inspect oil ring grooves (4) in center support (2) for roughness or damage. Replace center
support (2) if damaged.
3.
Inspect center support (2) for damage. Replace if damaged.
c. Inspection
b. Cleaning
a. Disassembly
INITIAL SETUP:
Applicable Models
M997A2, M1025A2, M1035A2,
M1043A2, M1045A2, M1097A2, M1123
To o l s
General mechanic’s tool kit:
automotive (Appendix G, Item 1)
Special To o l s
Driver handle (Appendix G, Item 34)
Bushing service set (Appendix G, Item 33)
Adapter (Appendix G, Item 45)
Clutch spring compressor (Appendix G, Item 47)
Center support thread reamer
(Appendix G, Item 143)
M a t e r i a l s / P a rt s
Inner piston seal (Appendix E, Item 129)
Outer piston seal (Appendix E, Item 132)
M a t e r i a l s / P a rts (Cont’d)
Four oil seal rings (Appendix E, Item 191)
Transmission fluid (Appendix B, Item 24)
Manual Refere n c e s
TM 9-2320-280-24P
Equipment Condition
Transmission disassembled into subassemblies
(para. 17-14).
General Safety Instructions
Air pressure must not exceed 15 psi (103 kPa)
when air checking clutch piston.
Maintenance Level
General support
TM 9-2320-280-34
1 7 - 9 0
Change 1
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