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 808 of 1258
TM 9-2320-280-34
17-9.
CENTER SUPPORT REPAIR (3L80)
This task covers:
a.
Disassembly
c.
Inspection
b.
Cleaning
d.
Assembly
INITIAL SETUP:
Applicable Models
Manual References
All vehicles except: M997A2, M1025A2,
TM 9-2320-280-24P
M1035A2, M1043A2, M1045A2, M1097A2
Equipment Condition
Tools
Transmission disassembled into subassemblies
General mechanic's tool kit:
(para. 17-3).
automotive (Appendix G, Item 1)
Special Tools
General Safety Instructions
Driver handle (Appendix G, Item 34)
Air pressure must not exceed 15 psi (103 kPa)
Bushing service set (Appendix G, Item 33)
when air check clutch piston.
Materials/Parts
Maintenance Level
Inner piston seal (Appendix E, Item 128)
General support
Outer piston seal (Appendix E, Item 131)
Four oil seal rings (Appendix E, Item 190)
Transmission fluid (Appendix B, Item 23)
NOTE
Work area should be well ventilated, clean, and free from blowing
dirt and dust.
a. Disassembly
1.
Remove four oil seal rings (1) from center support (2). Discard oil seal rings (1).
2.
Compress spring retainer (11), and remove snapring (5) and spring retainer (11) from center
support (2).
3.
Remove three release springs (10), spring guide (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).
b. Cleaning
Clean all center support components in accordance with para. 2-13.
c. Inspection
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.
4.
Check all oil passages in center support (2) for blockage.
5.
Inspect release springs (10) for signs of distortion or collapsed coils. Replace all springs (10) if any
have distorted or collapsed coils.
6.
Inspect clutch piston (6), spring guide (9), spring retainer (11), and snapring (5) for damage or
distortion. Replace any part if damaged or distorted.
17-30
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