4-15. AUXILIARY POWER UNIT - Continued
This task covers
Tool Kit, Master Mechanic,
Main Engine Shutdown (see para. 2-10)
APU Shutdown (see para. 2-12)
Batteries Disconnected (see para. 4-24)
The alternator can be removed with the APU assembly mounted in the truck.
Drive Belt Replacement
The drive belts can only be replaced if the pump is removed from the APU. This can be done with
the APU in the truck. Always replace drive belts as a matched pair.
Disassemble APU as detailed in para. 4-15.1 DISASSEMBLY, steps 2 thru 6
Install new drive belts and assemble APU as detailed in para. 4-15.1, ASSEMBLY, steps 5 thru 12.
Tag and disconnect electrical wiring to alternator.
Remove alternator tensioning bracket.
Remove alternator capscrew holding alternator to pump frame.
Install new alternator in compartment and attach to pump frame with capscrew.
Install drive belts over alternator fan pulley.
Install alternator tensioning bracket Push on alternator and tighten tensioning bracket capscrews such that
the drive belts can be pressed approximately 1/2 in. (2 mm) midway between the pulleys.