4-15. AUXILIARY POWER UNIT - Continued
4-15.1 Auxiliary Power Unit Assembly - Continued
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
tensioning bracket. Discard all locknuts
Loosen set screws (1)
Remove two capscrews (5), washers
and locknuts (3) Discard locknuts (4)
Carefully pull circulating pump (2) to
Remove key and drive coupling (6) from
Remove alternator drive belts
Remove the two capscrews (7) on the
capscrews into threaded holes of bushing
Tighten capscrews into bushing (8) to
force pulley (9) off bushing
Remove bushing, pulley, and drive shaft
key from engine
Remove four capscrews from pump
(11) Remove four capscrews and locknuts
securing engine to APU base plate.
This procedure details the method of rebuilding the APU assembly.
Install capscrews and locknuts to secure APU engine to the base plate.