TM 9-2350-256-20CHAPTER 13MAINTENANCE OF AUXILIARY POWER UNIT (APU)CHAPTER OVERVIEWThis chapter describes how to remove, service, and install the APU components.This chapter consists of the following paragraphs:Para.TaskPage13-1Replace APU Pressure Switch Assembly............................................................................................... 13-113-2Replace/Service APU Engine Air Cleaner, Filter, and Air Intake Tubes.................................................. 13-213-3Replace APU Cooling Air Exhaust ........................................................................................................ 13-413-4Replace APU Identification (ID) Plate ..................................................................................................... 3-513-5Replace APU Engine Fuel Filters........................................................................................................... 13-513-6Replace APU Engine Oil Filter............................................................................................................... 13-813-7Replace/Repair APU Control Box .......................................................................................................... 13-8When working on the APU, the following must be observed:WARNINGUnless the APU access door is properly secured by a strap, the access door can swing shut and injurepersonnel working on the unit, especially if the spare roadwheel is mounted in place on the hull. Tosecure the door, refer to TM 9-2350-256-10. The strap is routed through the lower access door ringhandle and stowed roadwheel hub, and tied to secure the door in the open position.13-1 REPLACE APU PRESSURE SWITCH ASSEMBLYTHIS TASK COVERSa. Removalb. InstallationINITIAL SET-UPTools:Parts:Equipment Condition:Tool kit, general mechanic'sLockwashers (4) (Appendix G,Center front air inlet grilles(Appendix C, item 53)item 130)removed (see paragraph 9-57)a. REMOVALWARNINGDo not attempt to loosen, tighten, or remove hydraulic fittings or lines when system is pressurized.13-1
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