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APU ENGINE LOW POWER - TM-5-4210-220-12_172
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TM-5-4210-220-12 Truck Firefighting: Powered Pumper: Foam and Water 500-GPM Capacity; Centrifugal Pump Power Takeoff Driven Manual
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PUMP WILL NOT PRIME - Continued
TM 5-4210-220-12 Table 4-2 UNIT TROUBLESHOOTING - Continued MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 5a PUMP WILL NOT ENGAGE  - Continued Step 4 If solenoid operates, fault is due to. a Failed pump, replace pump, (see para. 4-18). b Failed reducer gearbox, replace gearbox, (see para. 4-17). c Failed PTO, replace PTO, (see para. 4-17). d Leaking oil pressure lines, replace oil lines, (see para. 4-17). e Failed transmission, refer to Direct Support. 5b PUMP ENGAGES BUT WILL NOT ACHIEVE DESIRED WATER PRESSURES Step 1 Check pressure relief valve is not blowing off. Replace valve as required, (see para. 4-18). Step 2 Check air pressure to air regulator. Secondary air pressure must be greater than 85 psi (590 kPa). Step 3 Check air pressure out of regulator. Pump-and-roll regulator should be at least 75 psi (520 kPa), structural regulator should have variable air pressure up to 100 psi (690 kPa). Step 4 Check pump speed a Binding in pump, replace pump, (see para. 4-18). b Binding in reducer gearbox, replace gearbox, (see para. 4-17). c PTO clutch worn out - replace PTO, (see para. 4-17). 5c PUMP WILL NOT PRIME. Step 1 Check fiber wheel clearance. Refer to Direct Support if wheel worn. Step 2 Check hose connections between suction and priming pump for leaks. Replace hoses/tighten connections as required. 4-29

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