Symptom
Cause
Remedy
these parts will cause a drag on the shaft.
Replace any damaged parts as necessa-
ry.
The impellers are rotating too fast.
Check the frequency on the motor.
The pump and driver are misaligned.
Realign the pump and driver.
The discharge head is not properly
vented.
Open the vent.
The pump requires excessive
power.
The impellers are damaged.
Inspect the impellers for damage and re-
place them if necessary.
A foreign object is lodged between the
impeller and the bowl.
Remove the object.
The liquid is heavier than expected.
Check the specific gravity and viscosity.
The liquid viscosity is too high or the
pumped fluid is partially freezing.
Check for both conditions. They can
cause drag on the impeller. Consult an
ITT representative.
The bearings are defective.
Replace the bearings and check the shaft
or shaft sleeve for scoring.
The stuffing-box packing is too tight.
Release the gland pressure and retighten.
Keep the leaking fluid flowing. If there are
no leaks, then check the packing, sleeve,
or shaft.
See Maintenance for details.
The pump is noisy.
The pump is cavitating.
Increase the liquid level in the sump.
The shaft is bent.
Straighten as necessary.
Rotating parts are binding, loose, or
broken.
Replace parts as necessary.
The bearings are worn.
Replace the bearings.
The discharge head is not properly
vented.
Open the vent.
The pump is vibrating exces-
sively.
One of these conditions might exist:
•
The coupling is misaligned.
•
The shaft is bent.
•
The impellers are not balanced.
•
The bearings are worn.
•
There is cavitation.
•
There is strain on the discharge
piping.
•
There is resonance.
Determine the cause by using a vibration
frequency analyzer or by disassembling
the pump. A complex problem might re-
quire the assistance of an ITT representa-
tive.
The driver shaft is not adjusted proper-
ly.
Readjust the driver. See Installation for
details.
There is excessive leakage from
the stuffing box.
The packing is defective.
Replace any packing that is worn or dam-
aged.
The wrong kind of packing was used.
Consult an ITT representative.
The stuffing box is overheating. The packing is too tight.
Release the gland pressure and retighten.
Keep the leakage flowing. If there is no
leakage, then check the packing, sleeve,
or shaft.
See Maintenance for details.
The packing is not lubricated.
Release the gland pressure and replace
any packing that is burned or damaged.
Regrease the packing as necessary.
7.1 Operation troubleshooting
Model VCW Installation, Operation, and Maintenance
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Summary of Contents for Goulds Pumps VCW
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