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PUMP FAILS TO PRIME OR LOSES PRIME - TM-5-4210-233-14P-1_691
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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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PRESSURE WILL NOT RETURN TO ORIGINAL SETTING AFTER DISCHARGE VALVES ARE RE-OPENED
TM 5-4210-233-14&P-1 Table 5-2.  Direct Support Troubleshooting - Continued MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION FIREFIGHTING SYSTEM - Continued 1 PUMP FAILS TO PRIME OR LOSES PRIME - Continued NOTE Oil the priming pump after each operation in accordance with the lubrication instructions. Step 4.  Defective priming motor solenoid. Refer to electrical troubleshooting procedures (see Chapter 4). 2 ENGINE AND/OR PUMP SPEED TOO LOW AT FULL THROTTLE Step 1.  Insufficient power. Engine requires maintenance (see Chapter 6). Step 2.  Relief valve set improperly. Adjust relief valve (see para 2-13). NOTE If relief valve is set to relieve below desired operating pressure, water will bypass and reduce capacity. 3 ENGINE AND PUMP SPEED HIGHER THAN SPECIFIED FOR DESIRED PRESSURE AND VOLUME Pump impellers or wear rings badly worn. Install undersize wear rings if impeller to wear ring clearance is within limits indicated in MAINTENANCE INSTRUCTIONS.  If not, install new impellers and wear rings (see para 6-6). 4 PRESSURE NOT RELIEVED WHEN DISCHARGE VALVES ARE CLOSED Step 1.  Pilot valve sticking. Disassemble and clean (see para 4-36).  Replace noticeably worn parts. Step 2.  Incorrect assembly or plugged tube lines. Disconnect lines and inspect.  Check to be sure the drain valve is sealing correctly and not bypassing water. 5-22

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