This task covers:
Overdrive Unit Disasssembly
Overdrive Carrier Measurement
Overrun Clutch Disassembly
Overdrive Carrier Cleaning
Overrun Clutch Cleaning
Overdrive Carrier Inspection
Overrun Clutch Inspection
Turbine Shaft Inspection
Overrun Clutch Assembly
Overdrive Unit Assembly
M997A2, M1025A2, M1035A2,
M1043A2, M1045A2, M1097A2,
General mechanic's tool kit:
Transmission disassembled into subassemblies
Work area should be well-ventilated, clean, and free from blowing
dirt and dust.
a. Overdrive Unit Disassembly
Remove snapring (1) and turbine shaft (4) from overdrive carrier assembly (2).
Remove four seals (5) from shaft (4). Discard seals (5).
Separate overdrive carrier assembly (2) from overrun clutch housing assembly (3).
b. Overrun Clutch Disassembly
Remove snapring (6), backing plate (7), three clutch plates (12), and clutch plate assemblies (8)
from clutch housing (3).
Using spring compressor and adapter, compress spring and retainer assembly (10) and remove snapring (9).
Remove spring compressor and adapter, spring and retainer assembly (10), and piston (11) from
c. Overrun Clutch Cleaning
Clean all overrun clutch components, except piston (11), in accordance with para. 2-13.
d. Overrun Clutch Inspection
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
Inspect backing plate (7) for cracks, warpage, and scoring. Remove minor scoring. Replace plate (7)
Inspect spring and retainer assembly (10) for cracks, breaks, and uneven or damaged springs.
Replace spring if damaged.
Inspect piston (11) for crack or damage. Replace piston (11) if damaged.
Inspect housing (3) for cracks, chips, scored or burned thrust faces, and plugged holes. Unplug
holes. Replace if damaged.