TM-9-2320-272-24-3
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 3 OF 4
JUNE 1998
TM-9-2320-272-24-3 - Page 328 of 799
TM 9-2320-272-24-3
4-110. PARKING AND SERVICE BRAKEDRUM REPAIR
THIS TASK COVERS:
a. Cleaning
b. Inspection
INITIAL SETUP:
APPLICABLE MODELS
All
TOOLS
General mechanic’s tool kit (Appendix E, Item 1)
Inside micrometer (Appendix E, Item 83)
MATERIALS/PARTS
Drycleaning solvent (Appendix C, Item 71)
REFERENCES (TM)
TM 9-2320-272-24P
TM 9-4910-482-10
EQUIPMENT CONDITlON
Parking brakedrum removed (para. 3-223, 3-224,
3-460, or 3-461).
GENERAL SAFETY INSTRUCTIONS
• Drycleaning solvent is flammable and toxic. Do
not use near open flame.
• Keep tire extinguisher nearby when using
drycleaning solvent.
• Do not use compressed air or a dry brush when
working in areas of asbestos dust.
• Wear a fiber mask or respirator when working
around asbestos dust.
WARNING
• Drycleaning solvent is flammable and toxic. Do not use near an
open flame and always have a fire extinguisher nearby when
solvents are used. Use only in well-ventilated places, wear
protective clothing, and dispose of cleaning rags in approved
container. Failure to do this may result in injury to personnel
and/or damage to equipment.
• Do not use compressed air or a dry brush for cleaning when
working in areas where vehicle asbestos brake lining dust may
accumulate. Remove asbestos dust and other residue from these
areas using a soft bristle brush or cloth soaked with water.
Breathing asbestos dust may cause injury to personnel.
Wash parking brakedrum (1) or service brakedrum (2) with water and soft bristle brush. Allow to air-dry.
Clean with drycleaning solvent.
b. Inspection
1.
Inspect parking brakedrum (1) or service brakedrum (2) for warps and cracks. Replace if warped or
cracked.
2.
Inspect parking brakedrum (1) or service brakedrum (2) for scores or pits. If scored or pitted,
measure inside diameter at several positions. Replace parking brakedrum (1) if inside diameter is
greater than 13.5 in. (342.9 mm). Replace service brakedrum (2) if inside diameter is greater than
16.625 in. (422.28 mm).
3.
Resurface brakedrum to remove scores and/or pits (TM 9-4910-482-10).
4.
If parking brakedrum (1) or service brakedrum (2) was resurfaced, measure inside diameter.
Replace if inside diameter exceeds limits.
4-592
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