TM-9-2320-272-23-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 1 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-1 - Page 1058 of 1313
VEHICLE REAR BRAKES GRAB OR DRAG - Continued
STEP
4.
ARE REAR SERVICE BRAKES PROPERLY ADJUSTED?
NOTE
Clearance should be between 0.020 to 0.040 in. (0.508 to 1.016 mm).
Check rear service brake clearance between brakeshoe lining and drum (Volume 3, WP
0432).
T0237DAA
ADJUSTING HOLE
COVER
ADJUSTING
HOLE
ADJUSTING
STAR WHEEL
Figure 4.
Service Brake Adjustment.
CONDITION/INDICATION
ARE REAR SERVICE BRAKES PROPERLY ADJUSTED?
DECISION
NO - Adjust rear service brakes as necessary (Volume 3, WP
0432). Go to Step (7) to verify problem is solved.
YES - Go to Step (5).
STEP
5.
IS THERE EVIDENCE OF BRAKE SYSTEM AIR LEAKS?
a.
Start engine and run to build air supply to normal operating pressure.
b.
Assistant fully applies service brakes.
c.
Listen for leaking air lines or fittings. Refer to point to point schematics.
CONDITION/INDICATION
IS THERE EVIDENCE OF BRAKE SYSTEM AIR LEAKS?
DECISION
YES - Replace damaged air lines (Volume 5, WP
0805). Go to Step (7) to verify problem is solved.
NO - Go to Step (6).
TM 9-2320-272-23-1
0122
0122-5
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