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4.0 GENERAL TROUBLESHOOTING FOR ALL PUMPS
4.1 Troubleshooting Chart
12
MOTOR RUNS HOT OR STOPS
1. Motor surface temperature up to
104°F (40°C) over ambient can
occur. The motor will feel hot to the
touch.
2. Bad connection
3. Motor exceeded rated amp draw
4. Excessive ambient temperature
5. Heater size to small in motor heater
6. Binding rotation in the pump shaft
7. Bearings not adequately lubricated
8. Specific gravity or viscosity of liquid
higher than design conditions
9. Motor wired improperly
LOW PRESSURE
1. Pump not adequately primed
2. Air leak in inlet piping
3. Excessive flow
4. Clogged suction line filter or screen
5. Reverse rotation of pump shaft
6. Foot valve operating improperly
7. Wrong ratio for belt drive
PUMP LEAKING
1. Mechanical seal needs replacing
2. O-rings in pump casing damaged
3. Oil seals need replacing
4. Piping not sealed properly
LOW FLOW
1. Restrictions in inlet or discharge
2. Foot valve operating improperly
3. Air leak in inlet piping
4. Air leak in mechanical seal
5. Wrong installation of belt drive
6. Suction lift too high
7. Reverse rotation of pump shaft
8. Pump not primed adequately
9. Inlet strainer/filter plugged.
10. Pump throttling valve on discharge
closed (pump deadheaded)
MOTOR DOES NOT RUN
1. Blown fuse or tripped circuit breaker or
overload heater
2. Motor to hot - allow to cool
3. Motor voltage connection and line
voltage different
4. Bad connection
5. Motor wired improperly
6. Wrong ratio for belt drive
PUMP VIBRATION
1. Misalignment of flexible coupling
2. Bent pump shaft
3. Improper mounting
4. Starved suction
5. Worn bearings
6. Motor out of balance
7. Operating beyond specified capacity
range of the pump