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ENGINE AND PUMP SPEED TOO LOW AT FULL THROTTLE
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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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"HUNTING" (FLUCTUATING PRESSURE)
TM 5-4210-233-14&P-1 Table 4-2 Unit Troubleshooting - Continued MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION FIREFIGHTING SYSTEM - Continued 5 INSUFFICIENT PRESSURE Step 1. Follow procedures for engine and pump speed higher than specified for desired pressure and volume. Step 2. Check pump speed with tachometer at RPM COUNTER connection on pump operator's panel.  If pump speed is too low, adjust throttle.  If proper engine speed cannot be maintained, refer to engine troubleshooting. CAUTION Do not attempt to pump greater volume of water at the desired pressure  than  the  pump  is  designed  to  handle.    Exceeding pump    capacity    will    reduce    pressure    in    an    inverse    ratio. Exceeding  maximum  recommended  pump  speed  will  produce cavitation, and will seriously impair pump efficiency. 6 PRESSURE NOT RELIEVED WHEN DISCHARGE VALVES ARE CLOSED Step 1. Check for sticky pilot valve. Repair pilot valve (see para 4-36). Step 2. Check for plugged lines. Remove obstruction or replace line. 7 PRESSURE WILL NOT RETURN TO ORIGINAL SETTING AFTER DISCHARGE VALVES ARE RE- OPENED Step 1. Check for sticky pilot valve. Repair pilot valve (see para 4-36). Step 2. Check for main relief valve sticking. Repair relief valve (see para 4-35). 4-54

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