TM-9-2330-335-14-P
SEMITRAILER, TACTICAL, BREAKBULK/CONTAINER TRANSPORTER, 22-1/2 TON, RESET M871R, M871A1R AND M871A2R
TECHNICAL MANUAL; FIELD AND SUSTAINMENT MAINTENANCE MANUAL (INCLUDES REPAIR PARTS AND SPECIAL TOOLS LIST)
SEPTEMBER 2008
TM-9-2330-335-14-P - Page 579 of 640
0101-3
TM 9-2330-335-14&P
0101
Grooves along
edges of lining
Abrasive material
collecting at
edges of lining
Dust shield may cause or cure this problem.
Re-bore brake drum within normal limits.
See maintenance instructions regarding turning of brake
surface.
Blue or
discolored brake
surface
Excessive heat
from dragging
brakes or brake
imbalance
between tractor
and trailer
Re-bore brake drum within normal limits or replace. Look for
weak or broken return springs or binding brake actuation
system. See maintenance instructions regarding turning of
brake surface.
Heat spotted or
hard spots in
brake surface
High localized
heating and
cooling cycles
Grind hard spot and re-bore brake drum within normal limits.
See maintenance instructions regarding turning of brake
surface.
Out-of-round:
balance
Balance weight
has fallen off or a
balanced drum
was not specified
Re-bore brake drum. Specify balanced brake drums when
ordering replacement.
Out-of-round:
variation in
diameter
Out-of-round:
concentricity
Excessive wear
1.
Heat
d
isto
rtio
n
2.
Improper fit
to pilot or
improper
seating on
wheel or hub
3.
Abrasive
material
between
lining and
drum or poor
quality
lining
1.
Re-bore brake drum within normal limits or
replace. See maintenance instructions regarding
turning of brake surface.
2.
Clean all mounting surfaces. Check for correct fit and
clearance to wheel.
3.
Check maximum diameter and re-bore within limit or
replace. See maintenance instructions regarding turning
of brake surface.
Table 1. Troubleshooting Brake Drums - Continued.
EXAMPLE
PROBLEM
CAUSE
SOLUTION
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