Table 10-1. Wheel and Tire Troubleshooting Procedures.
M A L F U N C T I O N .
TEST OR INSPECTION.
TIRES WEARING UNEVENLY:
Check wheel alinement if problem is on front wheels.
Aline front wheels (para 10-10).
Check rear brakes for proper adjustment. (Front brakes are self -adjusting.)
Adjust brakes ( para 9-33, 9-34, 939).
Check wheel bearing for adjustment, lubrication, and damage.
Adjust, lubricate, or replace (para 10-13, 10-14, 10-15 or 10-16, as
NOISY OR BUMPING SOUND WHILE TRAVELING ON THE ROAD:
Check lug wheel stud cap nuts for proper torque.
Tighten lug nuts to 450 Ib-ft (610 N.m).
Inspect U-bolts for tightness.
Tighten U-bolts (125-165 Ib-ft (170-224 N.m) for M915,
200-270 Ib-ft (271-366 N.m) for M916 thru M920).
Inspect spring shackle pins for looseness using a pry bar. No noticeable movement
Refer to Direct Support Maintenance.
Check wheel bearings for vertical looseness using a prying bar beneath the tire.
Check for proper lubrication and damage.
Adjust, lubricate, or replace bearing (para 10-13, 10-14, 10-15 or 10-16, as
Inspect rear axle shaft for damage by jacking up both wheels. Turn wheels to one
extreme and rotate one wheel by hand while listening for a rumbling or grinding
sound within the axle. Repeat on other wheel.
Replace axle shaft (para 10-15),
Check pusher axle for damaged components or leaking air lines.
Replace components as necessary (para 9-38, 10 16) or contact Direct