TM  10-3930-638-24&P 2-45.   WHEELS   AND   TIRES   TROUBLESHOOTING   (cont) MALFUNCTION TEST   OR   INSPECTION CORRECTIVE  ACTION 1.  TIRE  WEARING  UNEVENLY  (cont) Step 1. (cont) a. If there is excessive drag on wheels, adjust brakes (para 2-43a). b. If there is a very slight drag on wheels, proceed to step 2. Step 2. With wheel off ground (step 1 above), check wheel bearing adjustment (use pry bar to check for any noticeable  end  play). a. If there is any noticeable end play, adjust wheel bearing (para 2-39f). b. If there is no noticeable end play, remove axle shaft (para 2-39f) and check that wheel bearing is lubricated. If wheel bearing is lubricated, check it for damage (para 2-39f); replace wheel bearing if necessary. 2. NOISY OR BUMPING SOUND WHILE TRAVELING Step 1. Check wheel lug nuts for tightness (should be tightened to 240-260 pounds foot torque). a. If lug nuts are loose, tighten to 240-260 pounds foot torque. b. If lug nuts are tight, proceed to step 2. Step 2. Place blocks (6 by 6 by 18 inches wood blocks) at each wheel to prevent vehicle from moving. Remove shipping lock pin from storage area under operator’s seat (para 2-4b (1)) and install in chassis. Ensure that parking brake is in released position. WARNING Before raising axle off ground, be sure that shipping lock pin is installed. Failure to do so may cause vehicle to turn and slip off jack or jack stands causing serious injury or death. If you are injured  by  falling  equipment,  obtain  medical  aid  immediately. Raise one axle and wheels off ground. Rotate wheel by hand while listening for a rumbling or grinding sound Repeat for other wheel and axle. within axle. a. If rumbling or grinding sound is heard, replace axle shaft (para 2-39f). b. If rumbling or grinding sound is not heard, proceed to step 3. Step 3. With wheel off ground (step 2 above), check wheel bearing adjustment (use pry bar to check for any noticeable  end  play). a. If ‘there is noticeable end play, adjust wheel bearing (para 2-39f). b. If there is no noticeable end play, proceed to step 4 below. 2-320