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TM 5-2420-222-34
10-3.
SERVICE BRAKE DISK AND PRESSURE PLATE REPAIR (Con’t).
2.
Clean transmission braking surface (20) with rags and dry cleaning solvent. Dry thoroughly with clean, dry rags.
3.
Inspect packing retainer (18) for scoring, heat cracks, excess wear, and discoloration.
4.
Inspect brake disk (17) for worn, broken, or scored linings.
5.
Inspect transmission braking surface (20) for scoring, heat cracks, and discoloration.
6.
Using combination square and micrometer depth gage, measure distance from machined face of transmission
(14) to transmission braking surface (20) or bottom of deepest score in transmission braking surface.
7.
Distance recorded in step 6 must not exceed 1.210 in. (30.734 mm). If distance exceeds specification, remove,
disassemble, and replace transmission housing (see paragraph 8-2).
b.
REPAIR
NOTE
•
Transmission braking surface may be resurfaced using the following steps.
•
Use a drain pan to catch fluid when disconnecting oil line. Clean up all spills.
1.
Position drain pan under tee (1) and oil line (4). Disconnect oil line from tee.
2.
Remove screw (7), washer (8), nut (10), and clamp (9) from oil lines (4, 12, and 13) and plate spacer (11).
3.
Remove capscrew (2), lockwasher (3), plate spacer (11), and nut (6) from clamp angle bracket (5) and oil lines (4,
12, and 13). Discard lockwasher.
4.
Plug oil line (4) and tee (1).
5.
Plug oil line (15) and bleed passage (19) in transmission (14).
CAUTION
Keep grinding dust out of transmission to prevent damage to transmission,
transmission oil pump, and hydraulic pump.
NOTE
Steps 6 through 8 apply only to left transmission braking surface.
6.
Using rotary electric grinder and abrasive wheel, grind down differential lock shaft bosses (16) below face of
transmission braking surface (20).
WARNING
Dry cleaning solvent, P-D-680, is toxic and flammable. Always wear protective
goggles and gloves, and use only In a well-ventilated area. Avoid contact with skin,
eyes, and clothes, and DO NOT breathe vapors. DO NOT use near open flame or
excessive heat. The solvent's flash point is 100°F-138°F (380C-590C). If you become
dizzy while using cleaning solvent, Immediately get fresh air and medical help. If
solvent contacts eyes, Immediately wash your eyes and get medical aid.
7.
Clean transmission braking surface (20) with dry cleaning solvent and rags. Dry thoroughly with clean, dry rags.
10-14
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