MIL-HDBK-1164
Table 19 (Continued)
Cause of Trouble
Symptom
Remedy
Pump parts failure
Check for broken shaft, broken bowl assembly,
loose impellers, and loose column-pipe joints.
Wrong direction of
Check for switched power leads.
rotation
Speed too low
Check power supply voltage and frequency.
Check for bearing friction and impeller
corrosion or obstruction.
Suction clogged
Backwash or use chemical treatment to clean.
Check static level and drawdown. Lower pump,
Operating water
clean screen, and decrease pumping rate.
level low
Low speed
Check power supply voltage and frequency;
check for excessive bearing friction and
impeller corrosion or obstruction.
Low water level in
Check well vent. Check pump inlet for
well
turbulence, vortexing, or eddies. Check well
screen for sand, rust, or biological growth.
Faulty instruments
Correct instrument readings.
Pump requires
Impeller rub
Check adjustment of impeller height.
excessive
power.
Wrong lubricant
Compare manufacturer's instructions with
lubricant being used.
Misalignment
Check for tight bearings; check for pump and
casing vibration.
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