TM 9-2320-289-34
7-2.
DRUM AND ROTOR REPAIR.
This task covers:
a. Drum Repair
b. Rotor Repair
INITIAL SETUP:
Equipment Condition
Materials/Parts
l Drum or rotor removed.
l Abrasive cloth (Item 17, Appendix B)
(See TM 9-2320-289-20)
Tools/Test Equipment
General Safety Instructions
l Micrometer
• DO NOT use a drum or rotor that
• Dial indicator
will not meet minimum wear
specifications.
a.
DRUM REPAIR
WARNING
DO NOT use a drum that will not meet minimum wear specifications.
Failure to follow this warning may result in brake failure and serious injury
or death to personnel.
1 .
Measure drum for out-of-round, taper, and wear. Take measurements at open and closed
edges of machined surface, and at right angles to each other. If drum measures more than
11.240 in. (285.50 mm) (M1009) or 13.090 in. (332.49 mm) (all except M1009), discard
drum.
NOTE
If brake linings are not being replaced, drum can be polished with fine
abrasive cloth but should not be machined.
2 .
If drum is grooved, out-of-round, tapered, or badly worn, machine drum using Table 7-1
specifications.
M o d e l
M 1 0 0 9
All Except
M 1 0 0 9
Table 7-1. Drum Diameters
Original
Maximum Refinish
Replacement/Discard
11.150 in. (283.21 mm)
11.210 in. (284.73 mm)
11,240 in. (285.50 mm)
13,000 in. (330,20 mm)
13.060 in. (331.72 mm)
13.090 in. (332.49 mm)
7 - 2
