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13. Examine all O-rings for nicks before using and
replace damaged O-rings with new ones.
14. Use Loctite
on socket head impeller locking
®
screw in end of shaft.
PUMP TROUBLESHOOTING
Pump will not start.
1. No power to the motor. Check for blown fuse or
open circuit.
2. Selector switch may be in the Off position.
3. Control circuit transformer fuse may be blown.
4. Overload heater on starter may be tripped. Push
to reset.
Pump will not start and overload heaters trip.
1. Turn off power and check motor leads with Megger
or ohmmeter for possible ground.
2. Check resistance of motor windings. All 3 phases
should show the same reading.
3. If no grounds exist and the motor windings check
OK, remove discharge elbow cover and check for
clogged or blocked impeller.
Pump operates with selector switch in Hand
position but will not operate in Auto position.
1. This indicates trouble in the float level control or
alternator relay.
2. Check control panel for trouble.
Pump runs but will not shut off.
1. Pump may be air locked. Turn pump off and let set
for several minutes, then restart.
2. Lower float control may be hung up in the closed
position. Check in wet well to be sure the control
is free.
3. Selector switch may be in the Hand position.
05625-556-1 11/18/13
Pump does not deliver proper capacity.
1. Discharge gate valve may be partially closed or
partially clogged.
2. Check valve may be partially clogged. Raise lever
up and down to clear.
3. Pump may be running in the wrong direction. Low
speed pumps can operate in reverse direction
without much noise or vibration.
4. Discharge head may be too high. Check total head
with gauge when the pump is operating.
5. If pump has been in service for some time and
capacity falls off, remove pump and inspect
impeller for wear.
Motor stops and then restarts after short period
but overload heaters in starter do not trip.
1. This indicates heat sensors in the motor are
tripping due to excessive heat. Impeller may be
partially clogged giving sustained overload but not
high enough to trip overload heaters.
2. Pump may be operating on a short cycle due to
faulty check valve in the wet well.
6
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