Quantcast Table 4-4. Organizational Troubleshooting Chart - continued - TM-5-4210-224-14-P0126

 

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Table 4-4. Organizational Troubleshooting Chart. - continued
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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 4-4. Organizational Troubleshooting Chart - continued - TM-5-4210-224-14-P0127
TMS-4210-224-14&P
Table 4-4. Organizational Troubleshooting Chart.(Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
12. FIRE PUMP WILL NOT ENGAGE.
Inspect for leaks in air system.
Locate and repair leaks as required (leakage, if external, maybe detected audibly.)
13. FIRE PUMP WILL NOT PRIME OR LOSES PRIME.
Step 1. Check electric priming system for adequate electric current.
Increase engine speed as required. Engine rpm should be adequate to maintain truck electrical system while
providing enough speed for initial pumping operation.
Step 2. Check priming system for defects. If pump is tight, but primer pulls less than 22 inches (558.8mm)
vacuum, it could indicate excessive wear.
Replace priming pump (paragraph 4-69).
Step 3. Check for air leaks.
Attempt to locate and correct air leaks.
CAUTION
Tighten packing only when the pump is primed and running at low speeds. Always allow slight
leakage of water through the stuffing box to insure against over-tightening of the packing.
Check pump packing during attempt to locate leakage. If leakage through the packing becomes
excessive, a light tightening of the knurled plunger is the only adjustment required.
14. LEAK AT FIRE PUMP PACKING.
Check if pump packing adjustment is loose.
CAUTION
Tighten packing only when the pump is primed and running at low speeds. Always allow slight
leakage of water through the stuffing box to insure against over-tightening of the packing.
Tighten the knurled plunger. Install new packing by removing the threaded cylinder head and
injection plunger.
4-31

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