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 558 of 1313
WHEEL SHIMMY OR WOBBLE - Continued
a.
Visually check front and rear wheel bearings for proper adjustment and damage.
T1043DAA
Figure 2.
Wheel Bearing Assembly.
b.
Raise vehicle wheels until they are off the ground M939 (Volume 3, WP
0484),
M939A1/A2 (Volume 3, WP
0485).
NOTE
Excessive play indicates improperly adjusted or damaged bearings.
c.
Use prybar to lift up on bottom of tire to determine bearing play. Excessive play indicates improperly
adjusted or damaged bearings.
CONDITION/INDICATION
ARE WHEEL BEARINGS IN GOOD OPERATING CONDITION?
DECISION
NO - Moderate play, adjustment required. Adjust wheel bearing(s) (Volume 3, WP
0483). Go to Step (3) to verify
problem is solved.
NO - Excessive play, front wheel bearings damaged. Replace damaged wheel bearings
M939/A1 (Volume 3, WP
0479), M939/A2 (Volume 3, WP
0481). Go to Step (3) to verify problem is solved.
NO - Excessive play, rear wheel bearings damaged. Replace rear wheel bearings
M939/A1 (Volume 3, WP
0480), M939/A2 (Volume 3, WP
0482). Go to Step (3) to verify problem is solved.
YES - Go to Step (3) to verify problem is solved.
TM 9-2320-272-23-1
0051
0051-3
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