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 890 of 1258
TM 9-2320-280-34
17-24.
TURBINE SHAFT AND OVERDRIVE CARRIER ASSEMBLY REPAIR (4L80-E)
This task covers:
a.
Overdrive Unit Disassembly
f.
Overdrive Carrier Measurement
b.
Overrun Clutch Disassembly
g.
Overdrive Carrier Cleaning
c.
Overrun Clutch Cleaning
h.
Overdrive Carrier Inspection
d.
Overrun Clutch Inspection
i
Turbine Shaft Inspection
e.
Overrun Clutch Assembly
j.
Overdrive Unit Assembly
INITIAL SETUP:
Applicable Models
Materials/Parts (Cont'd)
M997A2, M1025A2, M1035A2,
Two seals (Appendix E, Item 155)
M1043A2, M1045A2, M1097A2
Two seals (Appendix E, Item 154)
Tools
Transmission fluid (Appendix B, Item 24)
General mechanic's tool kit:
Manual References
automotive (Appendix G, Item 1)
TM 9-2320-280-24P
Dial indicator (Appendix G, Item 95)
Equipment Condition
Special Tools
Transmission disassembled into subassemblies
Spring compressor (Appendix G, Item 47)
(para. 17-14).
Adapter (Appendix G, Item 45)
Seal installer (Appendix G, Item 50)
Maintenance Level
General support
NOTE
Work area should be well-ventilated, clean, and free from blowing dirt and dust.
a.
Overdrive Unit Disassembly
1.
Remove snapring (1) and turbine shaft (4) from overdrive carrier assembly (2).
2.
Remove four seals (5) from shaft (4). Discard seals (5).
3.
Separate overdrive carrier assembly (2) from overrun clutch housing assembly (3).
b.
Overrun Clutch Disassembly
1.
Remove snapring (6), backing plate (7), three clutch plates (12), and clutch plate assemblies (8) from
clutch housing (3).
2.
Using spring compressor and adapter, compress spring and retainer assembly (10) and remove
snapring (9).
3.
Remove spring compressor and adapter, spring and retainer assembly (10), and piston (11) from
housing (3).
c.
Overrun Clutch Cleaning
Clean all overrun clutch components, except piston (11), in accordance with para. 2-13.
d.
Overrun Clutch Inspection
1.
Inspect all clutch plates (12) and (8) for cracks, breaks, scoring, pitting, and evidence of overheating
or composition wear. Replace clutch plates (12) and clutch plate assemblies (8) as a set if any are
damaged.
2.
Inspect backing plate (7) for cracks, warpage, and scoring. Remove minor scoring. Replace plate (7) i'
damaged.
3.
Inspect spring and retainer assembly (10) for cracks, breaks, and uneven or damaged springs.
Replace spring if damaged.
4.
Inspect piston (11) for crack or damage. Replace piston (11) if damaged.
5.
Inspect housing (3) for cracks, chips, scored or burned thrust faces, and plugged holes. Unplug holes.
/
Replace if damaged.
17-106
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