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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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