Table 3-5. Water Pump Troubleshooting - Continued
TEST OR INSPECTION
PUMP FAILS TO DELIVER WATER AT PROPER PRESSURE. - Continued
Check for clogged water inlet.
Drain pump and tank. Disassemble and clean suction pipe.
Check for worn impeller.
If worn, replace.
PUMP VIBRATES OR RUNS NOISILY.
Check for foreign matter in volute.
Disassemble and clean.
Check for insecure mounting.
Tighten pump motor mounting bolts.
Check for bent shaft, warped impeller, worn bearings.
Remove and inspect volute. Replace defective parts.
Mechanical defect in pump or motor.
Check motor for easy rotation and straight shaft, and
correct condition as required.
Check for incorrect voltage.
Check electrical system and correct applicable defect.