Quantcast INSPECTION - TM-9-2520-272-34P_57

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TM   9-2520-272-34&P 3-3.   INSPECTION NOTE Refer   to   paragraph   3-8   for   mandatory   replacement   parts. All   parts   should   be   inspected   when   they   are   removed   from   the   transmission. Look   for   metal   particle   contamination. This   may   appear   as   obvious   metal   particles,   or it   may   appear   as   dust-like   metallic   particles,   even   similar   to   small   deposits   of   grayish sludge.   When   this   condition   is   found   and   it   is   determined   that   repair   can   make   the transmission   serviceable,   the-hydrostatic   pump   and   motor   assembly   valve   bodies   and   oil pumps   must   all   be   replaced. In   addition,   all   parts   must   be   cleaned   and   inspected. Look   for   unusual   wear   or   damage. The   condition   of   parts   removed   can   identify   a problem   within   the   transmission,   often   before   the   problem   becomes   obvious   in   operation. Parts   that   are   to   go   back   in   the   transmission   must   be   thoroughly   inspected   to   determine that   they   are   satisfactory   for   continued   use. Parts   must   be   clean   enough   to   permit   proper   inspection. Refer   to   paragraph   3-2   CLEANING. Castinqs   and   Machined   Surfaces   Look   at   housings,   covers,   pistons,   and   castings   for   breaks cracks,   deep   scoring,   or   excessive   wear   that   should   prevent   continued   use.   Remove   nicks, burrs,   or   scratches   with   crocus   cloth   or   whetstone. Look   at   mounting   surfaces   on   housings,   valve   bodies,   and   covers   for   nicks,   scratches,   or scoring.   Remove   minor   defects   with   crocus   cloth   or   whetstone. Look   at   threaded   holes   for   damaged   threads.   Repair   damaged   threads   with   correct   size   tap   or by   replacing   threaded   insert. New   inserts   must   be   screwed   into   the   housing   one   turn   below   the surface.   Refer   to   TM   9-243   for   use   of   taps   and   dies. Look   at   oil   passages   for   obstructions   or   dirt.   Reclean   passages   if   necessary. Roller,   Ball   and   Sleeve   Bearinqs. CAUTION Any   bearing   that   has   been   subjected   to   metal   contamination   must   be   closely inspected   for   metal   particles.   Metal   particles   will   cause   bearing   failure. Refer   to   TM   9-214   for   inspection   procedures   applying   to   roller   and   ball   bearings. Look   at   sleeve   bearings   and   bushings   for   scoring,   burrs,   sharp   edges,   or   scuffing.   Remove   minor scoring,   sharp   edges,   or   scuffing   with   crocus   cloth   Remove   burrs   with   whetstone. 3-4 Para.   3-3


 


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