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SYMPTOM INDEX - TM-5-4210-224-14-P0086
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TM-5-4210-224-14-P 250 6PM Mini-Pumper Firefighting Truck Model No.:CM-KFT-3 Manual
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Table 3-1. Operator Troubleshooting Chart - continued - TM-5-4210-224-14-P0088
TM 5-4210-224-14&P
Table 3-1. Operator Troubleshooting Chart
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
FIRE PUMP, PIPING SYSTEM, VALVES, AND CONTROL RODS
1. WATER PRESSURE IS TOO HIGH (OVER 150 PSI) OR TOO LOW.
Check to see if pressure relief valve is set too high.
Adjust pressure relief valve as required.
2. FIRE PUMP WILL NOT ENGAGE.
Step 1. Check if pump shift was attempted before the vehicle was brought to a complete stop.
Release the braking system momentarily, reset and repeat pump shift procedures
Step 2. Check if parking brake was applied before the vehicle was brought to a complete stop.
Release the braking system momentarily, reset and repeat pump shift procedures (paragraph 2-15).
3. FIRE PUMP WILL NOT PRIME OR LOSES PRIME.
Step 1. Check oil level in priming tan k.
Refill priming tank with SAE-30 oil.
Step 2. Check if suction lift is too high (exceeding ten feet (3.1m).
Reposition vehicle as necessary to achieve suction lift of less than ten feet.
Step 3. Check that suction strainer is at least two feet below water surface.
Reposition as necessary.
Step 4. Check suction hose strainer for blockage.
Remove obstruction from strainer, do not allow suction hose strainer to rest on bottom of water supply,
keep strainer at least two feet below surface of the water supply.
Step 5. Check hard suction hose for loose connections or defects.
Tighten suction hose connections as required. Refer to next higher level of maintenance if hard
suction hose is defective.
3-3

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