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Page Title: APU ENGINE LOW POWER
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TM 5-4210-233-14&P-1 Table 4-2.  Unit Troubleshooting - Continued MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION AUXILIARY POWER UNIT - Continued 5 APU ENGINE LOW POWER Step 1. Check air cleaner. Replace filter and clean housing (see para 4-213). Step 2. Check fuel filter and hoses. Replace filter if dirty. Replace hoses if blocked or kinked (see para 4-210 and 4-211). Step 3. Notify Direct Support. WATER PUMP & PIPING 1 PUMP WILL NOT ENGAGE Step 1. Check correct sequence of switching has been carried out (see para 2-13.). Use proper switching sequence. Step 2. Check shift solenoid clicks when pump switch operated. If no click, see Electrical System troubleshooting. Step 3. Notify Direct Support. 2 PUMP ENGAGES BUT WILL NOT ACHIEVE DESIRED WATER PRESSURE Step 1. Check relief valve setting. Adjust or replace relief valve as required (see para 4-35 and 4-36). Step 2. Check pump speed. a. Binding in pump (notify Direct Support). 4-31

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