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AIR OPERATED VALVE (FOR AERIAL DISCHARGE) FAILS TO OPEN OR CLOSE
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TM-5-4210-233-14P-1 Twin Agent 4x4 Firefighting Truck Model No. CM-KFT-B Manual
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P. T. O.  WILL NOT ENGAGE
TM 5-4210-233-14&P-1 Table 4-2 Unit Troubleshooting - Continued MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION FIREFIGHTING SYSTEM - Continued 14 DISCHARGE HOSE WON'T DE-PRESSURIZE Check drain valve for blockage. Clean dirt/blockage from drain hole. 15 NO FOAM DISCHARGE AT ANY NOZZLE Step 1. Check if foam valve set 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. Step 3. Check if foam tank empty or content diluted. Drain tank and/or refill tank as required. 16 EXCESS FOAM FROM NOZZLE Check percentage setting on foam metering valve with chart. Reset from metering valve.  If condition continues, refer to Direct Support Maintenance. 17 FOAM ENTERING WATER TANK Check if tank fill/recirculating valve is open or partially open. Close valve. 18 WATER ENTERING FOAM TANK Defective 1-1/2" check valve in foam system piping. Replace 1-1/2" check valve (see para 4-37). 4-57

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