Goulds Pumps VIC - IOM - Manual (Page 61)

Symptom Cause Remedy
The pump starts and then stops
pumping.
Excessive power is required. Use a larger driver. Consult an ITT
representative.
The pump is pumping a higher viscosity or
different specific gravity liquid than it was
designed to handle.
Test the liquid for viscosity and specific
gravity. Consult an ITT representative.
Critical parts have experienced mechanical
failure.
Check the bearings, wear rings, and impellers
for damage. Any irregularities in these parts
will cause a drag on the shaft. Replace any
damaged parts as necessary.
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 replace
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 excessively. 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 require the
assistance of an ITT representative.
The driver shaft is not adjusted properly. 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 damaged.
The wrong kind of packing was used. Consult an ITT representative.
Troubleshooting (Continued)
Model VIC Installation, Operation, and Maintenance 59