TM 9-2350-287-10TROUBLESHOOTING (Auxiliary Power Unit Engine) (continued)MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION23. APU ENGINE OVERHEATSStep 1. Check air intake passage for obstruction.Remove obstruction.Step 2. Check crankcase oil level (Appendix E).If low, fill (Appendix E).If condition persists, notify Unit maintenance.24. APU ENGINE MISFIRESStep 1. Check air intake filter.Clean or replace filter element (p. 3-44).Step 2. Check for contaminants in fuel filters.Drain filters (p. 3-44).If condition persists, notify Unit maintenance.25. APU ENGINE LACKS POWERStep 1. Check air intake passage for obstruction.Remove obstruction.Step 2. Check for contaminants in fuel filters.Drain filters (p. 3-44).If condition persists, notify Unit maintenance.HYDRAULIC SYSTEM26. NO RESPONSE TO ANY CONTROLStep 1. Check hydraulic fluid supply (Appendix E).f low, fill reservoir (Appendix E).Step 2. Check that ball valve in suction line is open.If closed, open valve.3-12
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