Goulds Pumps VIT - IOM - Manual (Page 68)

Symptom Cause Remedy
The pump requires excessive power. The impellers are damaged. Inspect the impeller for damage and replace it
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 leakage flowing. If there is no leakage, 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.
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.
The wrong grade of packing was used. Consult an ITT representative.
The stuffing box was improperly packed. Repack the stuffing box.
The packing wears out too fast. The shaft or shaft sleeve is worn or scored. Remachine or replace any parts as necessary.
There is insufficient leakage across the
packing.
Repack the stuffing box and make sure that the
packing is loose enough to allow some leakage.
The stuffing box was improperly packed. Repack the stuffing box properly, making sure
that all old packing is removed and the stuffing
box is clean.
The wrong grade of packing was used. Consult an ITT representative.
Troubleshooting (Continued)
66 Model VIT Installation, Operation, and Maintenance