TM-9-2320-283-20-1
TRUCK TRACTOR, LINE HAUL, 50,000 GVWR, 6X4, M915A1
TECHNICAL MANUAL; ORGANIZATIONAL MAINTENANCE PART 1 OF 3
DECEMBER 1983
TM-9-2320-283-20-1 - Page 446 of 926
TM 9-2320-283-20-1
TROUBLESHOOTING.
2-11.
TROUBLESHOOTING PROCEDURES (Continued).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
127.
NOISY OR BUMPING SOUND WHILE TRAVELING ON ROAD (Continued).
Step 4.
Check wheel bearings for vertical looseness using a pry bar beneath tire.
Check for proper lubrication and
damage.
Adjust, lubricate, or replace bearing (para 3-204 or 3-207).
Step 5.
Inspect rear axle shaft for damage by jacking up both wheels.
Turn wheel while listening for a rumbling or
grinding sound at the axle.
Repeat on other wheel.
Replace axle shaft (para 3-154).
STEERING SYSTEM
128.
FRONT TIRES WEARING UNEVENLY.
Step 1.
Inspect U-bolts for tightness.
Torque U-bolts to 125-165 lb-ft.
Step 2.
Inspect spring shackle pins for looseness using a pry bar.
No noticeable movement is allowable.
Refer to direct support maintenance.
Step 3.
Check wheel bearings for vertical looseness using a pry bar beneath the tire.
Check for proper lubrication
and damage.
Adjust, lubricate, or replace bearing (para 3-204 or 3-207, as applicable).
Step 4.
Check for proper toe-in (1/32-inch ± 1/32-inch).
Adjust toe-in (para 3-203).
Step 5.
Check brakes for proper adjustment.
Adjust brakes (para 3-157).
2-320
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