TM   10-3930-643-20 WHEEL  TROUBLESHOOTING  AND  MAINTENANCE.  (cont) 9 - 1. Wheel    Troubleshooting. MALFUNCTION TEST OR INSPECTION CORRECTIVE  ACTION a. TIRE WEARING UNEVENLY. Before   raising   axle   off   ground,   insure   that   shipping   lock   pin   is installed.   Failure   to   do   so   may   cause   vehicle   to   turn   and s l ip o f f jackstands   causing   SERIOUS   INJURY   or   DEATH.   If   you   are   injured   by falling   equipment,   obtain   medical   aid   immediately. Place   wood   block   at   each   wheel   to   prevent   vehicle   moving.   Install shipping   lock   pin   in   chassis.   Place  parking  brake  in  RELEASED  position after   running   engine   to   build   up   air   pressure. Raise   one   axle   and wheels   off   ground. If   tires   show   excessive   wear   or   bruising,   refer   to   TM   9-2610-200-24 f o r    r e p a i r . b . WHEEL   WOBBLES. Step   1. Check   wheel   mounting   bolts   for   tightness. If   mounting   bolts   are   loose,   tighten   to   280   to   300   lb-ft. Step   2. Raise   one   axle   and   wheel   off   ground,   refer   to   MALFUNCTION   “a”, above. Rotate   wheel   by   hand   while   listening   for   a   rumbling   or grinding   sound   within   axle. Repeat   for   other   wheel   and   axle. If   rumbling   or   grinding   sound   is   heard,   notify   Direct   Support. Step   3.   With   wheel   off   ground,   check   wheel   bearing   adjustment   by   using pry  bar  to  check  for  any  noticeable  end  play. If   there   is   any   noticeable   end   play,   notify   Direct   Support. Step   4. Remove   wheel   and   tire   assembly   and   disassemble. C h e c k    f or foreign   material   or   damage,   refer   to   paragraph   9-2. Remove   foreign   material   and   replace   tire   if   damaged. 9-2

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