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TM  9-2350-287-34 CHAPTER  12 AUXILIARY POWER UNIT Paragraph Page Number Paragraph Title Number 12-1 General    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... 12-1 12-2 APU Chain Cover Repair   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-1 12-3 APU Gearcase Repair  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-4 12-4 APU Generator Brushes Repair  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-17 12-1.   GENERAL This  chapter  provides  maintenance  instructions  to  repair  the  auxiliary  power  unit  (APU)  chain  cover  and  APU gearcase. APU engine maintenance is covered in TM 9-2815-221-34&P, and APU generator maintenance is covered in  TM  9-2920-224-34&P. 12-2.  APU  CHAIN  COVER  REPAIR. This Task Covers: a.   Removal b.  Cleaning  and  Inspection c.  Installation Initial Setup: Tools/Test Equipment: Sealing compound (Item 22, Appendix B) Drain pan (Item 12, Appendix D) Gasket (Item 20, Appendix H) General mechanic’s tool kit (Item 19, Appendix D) Gasket (Item 31, Appendix H) Lockwasher (17) (Item 44, Appendix H) Materials/Parts: Drycleaning solvent (Item 9, Appendix B) Equipment Conditions: Sealant adhesive (Item 3, Appendix B) APU on crew work surface. a. 1. 2. 3. 4. REMOVAL Position drain pan under drain plug (7). Remove plug (7) and gasket (8) from chain cover (2) and drain. Discard gasket. NOTE Perform  steps  2  and  3  only  if  replacing cover. Remove four screws (5) and data plate (6) from cover  (2). Remove breather(1), breather elbow (10), and fill plug (9) from cover (2). Remove 15 screws (4) and Iockwashers (3) from cover (2). Discard Iockwashers. 12-1

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