Goulds Pumps 3296 EZMAG - IOM - Manual (Page 74)

Troubleshooting
Troubleshooting
Operation troubleshooting
Symptom Cause Remedy
The pump is not delivering liquid. The pump is not primed. Reprime the pump and check that the
pump and suction line are full of liquid.
The suction line is clogged. Check the suction line pressure. If it is
low, locate and remove any obstructions.
The impeller is clogged. Disassemble the impeller and remove the
blockage.
The magnet is de-coupling. Shut down the pump and check the tem-
perature and viscosity of the pumped
fluid. Check the magnets with a break-
away torque test.
The pump is not producing rated flow or There is an air leak in the suction line. Check for leaks and repair the lines.
head.
The impeller is partly clogged. Back flush the pump to clean the impeller.
The impeller rings are worn. Replace the defective ring as required.
There is insufficient suction head. Make sure that the suction line shutoff
valve is fully open and the line is unob-
structed. Check the suction pressure.
The impeller is either worn or broken. Inspect and replace the impeller if neces-
sary.
The rotation is wrong. Correct the wiring.
Pump starts and then stops pumping. The pump is not primed correctly. Reprime the pump.
There is an air leak in the suction line. Check for leaks and correct.
The magnet is de-coupling. Shut down the pump. Check the tempera-
ture and viscosity of the pumped fluid.
Check the magnets with a breakaway
torque test.
There are either air or vapor pockets in Rearrange the piping to eliminate air
the suction line. pockets.
The bearings run hot. The bearings are not lubricated properly. Check the suitability and level of the
lubricant.
The lubricant is cooling. Check the cooling system.
The pump is not aligned properly. Check the pump alignment.
Pump is noisy or vibrates. The pump or driver is not aligned proper- Align the shafts.
ly.
There is a partially-clogged impeller caus- Disassemble the impeller and remove the
ing the imbalance.
blockage.
There is a broken or bent impeller or Replace as required.
shaft.
The base is not rigid enough.
Tighten the pump and motor hold-down
bolts or adjust the stilts. Then check the
grout.
The suction or discharge piping is not Anchor the piping per the Hydraulic Insti-
anchored or properly supported. tute Standards recommendations (Edition
14, centrifugal pump section).
The pump is cavitating. Increase the NPSH available.
The motor requires excessive power. The head is lower than the rating and the Install a throttle valve.
pump has too much liquid.
The liquid is heavier than expected.
Check the specific gravity and viscosity.
The head is higher than the rating, which Check the impeller diameter.
is at capacity.
The rotating parts are binding or are
Check the internal wearing parts for prop-
severely worn. er clearances.
The motor rotation is incorrect. Correct the wiring.
72 Model 3296 EZMAG Installation, Operation, and Maintenance Manual