TM 9-2320-280-34
This task covers:
a.
Overdrive Unit Disasssembly
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
M997A2, M1025A2, M1035A2,
Two plain seals (Appendix E, Item 223)
Two plain seals (Appendix E, Item 224)
M1043A2, M1045A2, M1097A2,
Transmission fluid (Appendix B, Item 24)
M1123
Manual References
Tools
TM 9-2320-280-24P
General mechanic's tool kit:
automotive (Appendix G, Item 1)
Equipment Condition
Dial indicator (Appendix G, Item 95)
Transmission disassembled into subassemblies
Special Tools
Spring compressor (Appendix G, Item 47)
Maintenance Level
Adapter (Appendix G, Item 45)
General support
Seal installer (Appendix G, Item 50)
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 asssemblies (8) as a set if any are
damaged.
2.
Inspect backing plate (7) for cracks, warpage, and scoring. Remove minor scoring. Replace plate (7)
if 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.
Change 2
