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TM 9-2320-360-34-1
12-2. BRAKE DRUM INSPECTION/REPAIR
This task covers
a. Inspection and Repair
b. Follow-On Maintenance
Initial Setup:
Equipment Conditions
Materials/Parts
Brake drum removed (TM 9-2320-360-20).
Cloth, Crocus (Item 16, Appendix B)
Solvent, Dry Cleaning (Item 54, Appendix B)
Tools and Special Tools
Tool Kit, Genl Mech (Item 202, Appendix E)
Personnel Required
Gage, Brake Drum Micrometer (Item 45.1,
Two
Appendix E)
Lathe, Brake Drum (Item 94, Appendix E)
a.
Inspection and Repair
WARNING
· Dry cleaning solvent P-D-680 is toxic and flammable. Wear protective goggles and
gloves and use only in a well-ventilated area. Avoid contact with skin, eyes, and
clothes, and don't breathe vapors. DO NOT use near open flame or excessive heat.
The flash point is 100-138° F (38-59° C). If you become dizzy while using cleaning
solvent, get fresh air immediately and medical aid. If contact with eyes is made,
wash your eyes with water and get medical aid immediately.
· Brake drum may be coated with dust. Breathing dust may be harmful to personnel.
Do not used compressed air to clean brake drum. Wear filter mask approved for
use against brake dust.
(1)
Clean brake drum (1) with dry cleaning solvent.
NOTE
Brake drum must be round within 0.003 in. (0.076 mm). If drum is out of round, go
to step (3).
(2)
Check brake drum (1) for badly scored finish, heat cracks, or other damage. If drum is scored, machine
drum. Go to step (3).
WARNING
Brake drum weighs 134 lb (61 kg). Use lifting device or get assistance to lift drum.
Failure to comply may result in injury.
(3)
Install brake drum (1) on turning equipment.
NOTE
Machine drum only enough to obtain a smooth, clean finish, free of pits, grooves,
or cracks.
(4)
Reface braking surface (2) with brake drum lathe, removing a maximum of 0.01 in. (0.25 mm) per cut.
(5)
Remove brake drum (1) from turning equipment.
12-2 Change 1
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