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FIRE PUMP WILL NOT PRIME
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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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EXCESS FOAM FROM TURRET OR NOZZLE
TM 5-4210-220-12 Table 3-1.  OPERATOR TROUBLESHOOTING - Continued MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 3a  AIR OPERATED VALVE FAILS TO OPEN OR CLOSE Step 1.  Check correct switching sequence. Carry out correct switching sequence, (see para. 2-11). Step 2.  Check air leaking from switch or valve connections. Tighten connection. 3b  VALVES LEAKING WATER/AGENT Valves not closed. Close valve. 4  WATER/AGENT REMAINS IN PIPING AFTER DRAIN OPENED Check drain valve outlet. Clean dirt/blockage from drain hole. 5  DISCHARGE HOSE WON'T DEPRESSURIZE Check drain valve. Clean dirt/blockage from drain hole. 6a  NO FOAM DISCHARGE AT ANY NOZZLE Step 1.  Check if foam valve set to OPEN. Set foam valve to OPEN. Step 2.  Check if foam proportioning valve (in cab or on structural panel) closed. Set foam proportioning valve to required percentage, (see para. 2-11). Step 3.  Check if foam tank empty or content diluted. Drain tank and/or refill tank as required. 3-6

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