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Page Title: DISASSEMBLY
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TM 5-4210-220-12 4-15.  AUXILIARY POWER UNIT - Continued 4-15.1 Auxiliary Power Unit Assembly - Continued DISASSEMBLY NOTE In general, the APU assembly will only be removed from the hose body compartment so that the  engine  can  be  replaced,  or  repaired.    The  alternators  and  pump  can  be  repaired  or replaced with the APU assembly in the truck.  The following details the procedures to replace the engine. (1) Remove alternator and alternator tensioning bracket.  Discard all locknuts (2) Loosen set screws (1) (3) Remove two capscrews (5), washers (4) and   locknuts   (3)   Discard   locknuts      (4) Carefully    pull    circulating    pump    (2)    to separate engine and pump drive couplings (5) Remove  key  and  drive  coupling  (6)  from engine shaft (6) Remove alternator drive belts (7) Remove   the   two   capscrews   (7)   on   the alternator drive bushing. Thread capscrews into threaded holes of bushing (8) Tighten   capscrews   into   bushing   (8)   to force pulley (9) off bushing (9) Remove  bushing,  pulley,  and  drive  shaft key from engine (10) Remove     four     capscrews     from     pump mounting bracket (11)    Remove    four    capscrews    and    locknuts securing    engine    to    APU    base    plate. Discard locknuts   ASSEMBLY NOTE This procedure details the method of rebuilding the APU assembly. (1) Install capscrews and locknuts to secure APU engine to the base plate. 4-142

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