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PUMP FAILS TO PRIME OR LOSES PRIME - TM-5-4210-233-14P-1_180
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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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ENGINE AND PUMP SPEED TOO LOW AT FULL THROTTLE
TM 5-4210-233-14&P-1 Table 4-2.  Unit Troubleshooting - Continued MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION FIREFIGHTING SYSTEM - Continued 1 PUMP FAILS TO PRIME OR LOSES PRIME - Continued Step 7. Check for a clogged orifice in the oil line at the fitting of the priming pump head. Refer to Direct support maintenance level to remove obstruction from orifice. Step 8. Check vane primer pump. After prolonged service, wear may increase primer vane clearance and reduce efficiency. Refer to Direct support maintenance level to adjust. Step 9. Check valve in by-pass line stuck open. If a bypass line is installed between the pump discharge and water tank to prevent pump from overheating with all discharge valves closed, look for a check valve in the line.  If valve is stuck open, clean it, replace it, or temporarily block off line until a new valve can be obtained. Step 10.  Estimate or measure vertical distance from water source to pump. Do not attempt lifts exceeding 22 vertical feet (6. 7 m) except at iow altitudes and with equipment in new condition. Step 11.   Check that end of suction hose is deep enough. Although suction hose might be immersed enough for priming, pumping large volumes of water may produce whirlpools, which will allow air to be drawn into suction hose.  Whenever possible, place end of suction hose at least two feet below water surface. Step 12.   Check that suction line is below pump. If possible, avoid placing any part of suction hose higher than pump suction inlet.  If high point cannot be prevented, close discharge valve as soon as pressure drops, and reprime.  This procedure will usually eliminate air pockets in suction line, but it may have to be repeated several times. Step 13.   Primer not operated long enough. Refer to operating instructions for required priming time.  Repeat priming procedure. NOTE The   maximum   time   for   priming   should   not   exceed   one-half minute for lifts up to 10 feet (3. 05 m). 4-52

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