MIL-HDBK-1164
Table 19
Troubleshooting Checklist for Vertical Turbine Well Pumps
Cause of Trouble
Symptom
Remedy
Pump fails to
Bearing friction
Check tube tension nut for tightness; check for
start.
bent shaft and proper anchoring; check oil.
Corrosion products
Check, particularly on out-of-service pumps.
or biological growth
Where necessary, flush with acid, chlorine,
and/or hexametaphosphate.
Fuses burned out
Check voltages at each phase of motor
terminals.
Impeller locked
Check for sand; raise or lower impeller;
backwash. Pull pump if necessary. Also check
impeller adjustment; raise impeller to allow
shaft to stretch for hydraulic thrust.
Faulty driver
Disconnect from pump and check starting.
Power not available Check circuit breaker, fuse, and starter.
Overload relay trip
Reset.
Trash in casing
Check. If necessary, pull pump and clean.
Low voltage
Check.
Well cave-in
Check; pull pump; repair well.
Pump does not
Pump not primed
Check for proper pump submergence. Vent well
deliver water.
to atmosphere to eliminate vacuum at pump
suction.
Discharge head too
Check for closed discharge valves or stuck
high
check valves.
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