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Table 4-4. Organizational Troubleshooting Chart.
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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-P0126
TMS-4210-224-14&P
Table 4-4. Organizational Troubleshooting Chart (Continued).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
5. REAR WARNING LIGHTS INOPERATIVE.
Step 1. Inspect for loose or burnt out bulbs.
Secure or replace bulbs (paragraph 4-49).
Step 2. Inspect for loose connections.
Tighten connections.
Step 3. Inspect for blown fuse.
Replace fuse. If new fuse blows, check for short to gound
in circuit between fuse and lights.
FIRE PUMP, PIPING SYSTEM, VALVES AND CONTROL RODS
6. ENGINE SPEEDS TOO HIGH FOR REQUIRED FIRE PUMP CAPACITY OR PRESSURE.
Check for inaccurate tachometer.
Replace tachometer if necessary (paragraph 4-34).
7. DISCHARGE VALVES DIFFICULT TO OPERATE.
Check for lack of lubrication.
Lubricate discharge and suction valves using a good grade
petroleum base or silicon base grease (Appendix D, Item 16).
8. DISCHARGE VALVE CONTROL ROD IS DIFFICULT TO OPERATE.
Check for lack of lubrication.
Lubricate control linkages with oil.
9. PRESSURE RELIEF VALVE DOES NOT RECOVER AND RETURN TO ORIGINAL PRESSURE
SETTING AFTER OPENING VALVES.
Check for faulty pressure relief valve.
Replace pressure relief valve (paragraph 4-68).
10. UNABLE TO ATTAIN PROPER SETTING ON RELIEF VALVE.
Step 1. Check if strainer in supply line from pump discharge to control valve is blocked.
Turn pressure relief valve control flush knob counterclockwise to flush strainer.
Step 2. Check for "Hunting Condition."
Clean strainer in relief valve system following Step 1 above.
11. WATER PRESSURE IS TOO HIGH OR TOO LOW.
Check for defective pressure relief valve.
Replace pressure relief valve (paragraph 4-68).
4-30

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