TM  10-3930-638-24&P 2-36.   TRANSMISSION   TROUBLESHOOTING   (cont) MALFUNCTION TEST  OR  INSPECTION CORRECTIVE ACTION 5. LOSS OF POWER (cont) Step 3. (cont) WARNING Before raising wheel 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 off ground. Rotate wheel by hand and check that wheel rotates freely without excessive drag. Repeat  for  remaining  wheel. Repeat  for  remaining  axle. a. b. If a wheel does not rotate freely without excessive drag or is locked, adjust brakes (para 2-43a). If wheels rotate freely, lower axle to ground, remove shipping lock pin and blocks. Check drive shafts and universal joints for damage (para 2-39); repair or replace as necessary (para 2-39). 2-37.   AXLES   AND   DRIVE   SHAFT   ASSEMBLIES   TROUBLESHOOTING MALFUNCTION TEST  OR  INSPECTION CORRECTIVE  ACTION 1. LUBRICANT LEAKING FROM DIFFERENTIAL BREATHER Check oil level (para 2-39d). Drain to proper level (para 2-39d). 2.  CONTINUOUS  AXLE  OR  WHEEL  NOISE Step  1. Step  2. Check lubricant level (para 2-39d). a. If lubricant level is below fill plug opening, add lubricant (refer to current lubrication order) to fill plug opening then reinstall fill plug. b. If lubricant level is okay, proceed to step 2. WARNING Before  raising  wheel  from  ground,  install  shipping  lock  pin (para  2-4b(1)). Check wheel bearing for proper adjustment (raise wheel and use pry bar to check for any noticeable end play) or damage. Repeat for other wheels. 2-199