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INSUFFICIENT PRESSURE
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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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AIR OPERATED VALVE (FOR AERIAL DISCHARGE) FAILS TO OPEN OR CLOSE
TM 5-4210-233-14&P-1 Table 4-2 Unit Troubleshooting - Continued MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION FIREFIGHTING SYSTEM - Continued 8 "HUNTING" (FLUCTUATING PRESSURE) NOTE Hunting can result from a combination of suction and discharge conditions involving the pump, relief valve, and engine.  When the   elasticity   of   the   suction   and   discharge   system   and   the response  rate  (reaction  time)  of  the  engine,  pilot  valve,  and relief  valve  are  such  that  the  system  never  stabilizes,  hunting results.      Changing   one   or   more   of   these   factors   enough   to disrupt this timing should eliminate hunting. Step 1. Inspect suction hoses and connections for worn seals or loose connections. Tighten connections or replace seals in suction hoses (see para 4-1 0 and 4-1 1). Step 2. Check for sticky pilot valve. Repair pilot valve (see para 4-36). Step 3. Check for sticking relief valve. Repair relief valve (see para 4-35). 9 SLOW RESPONSE Check for plugged filter or line. Clean lines and filter. 10 FIRE PUMP WILL NOT ENGAGE Step 1. Check correct switching sequence has been carried out. Carry out correct switching sequence (see para 2-13). Step 2. Check for electric shift disengaged. Push in manual disengage handle (on left hand side of pump body). 4-55

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