Symptom
Cause
Remedy
The stuffing box is not packed properly.
Check the packing and repack the box.
The mechanical seal parts are worn.
Replace the worn parts.
The mechanical seal is overheating.
Check the lubrication and cooling lines.
The shaft or shaft sleeve is scored.
Machine or replace the shaft sleeve as nec-
essary.
The motor requires ex-
cessive power.
The discharge head has dropped below
the rated point and is pumping too much
liquid.
Install a throttle valve. If this does not help,
then trim the impeller diameter. If this does
not help, then contact your ITT representa-
tive.
The liquid is heavier than expected.
Check the specific gravity and viscosity.
The stuffing-box packing is too tight.
Readjust the packing. If the packing is worn,
then replace the packing.
Rotating parts are rubbing against each
other.
Check the parts that are wearing for proper
clearances.
The impeller clearance is too tight.
Adjust the impeller clearance.
7.2 Alignment troubleshooting
Symptom
Cause
Remedy
Horizontal (side-to-side) align-
ment cannot be obtained (angu-
lar or parallel).
The driver feet are bolt-
bound.
Loosen the pump's hold-down bolts, and slide the pump
and driver until you achieve horizontal alignment.
The baseplate is not
leveled properly and is
probably twisted.
1.
Determine which corners of the baseplate are
high or low.
2.
Remove or add shims at the appropriate cor-
ners.
3.
Realign the pump and driver.
Vertical (top-to-bottom) align-
ment cannot be obtained (angu-
lar or parallel).
The baseplate is not
leveled properly and is
probably bowed.
1.
Determine if the center of the baseplate should
be raised or lowered.
2.
Level screws equally at the center of the base-
plate.
3.
Realign the pump and driver.
7.3 Assembly troubleshooting
Symptom
Cause
Remedy
There is excessive shaft end play.
The internal clearance of the bearings
exceeds the recommended amount.
Replace the bearings with a bear-
ing of the correct type.
The snap ring is loose in the bearing-
housing groove.
Re-seat the snap ring.
There is excessive shaft and sleeve
runout.
The sleeve is worn.
Replace the sleeve.
The shaft is bent.
Replace the shaft.
There is excessive bearing-frame
flange runout.
The shaft is bent.
Replace the shaft.
The flange of the bearing frame is dis-
torted.
Replace the bearing-frame flange.
The adapter-to-frame gasket is not
seated properly.
Re-seat the frame adapter and make
sure that the adapter-to-frame gasket is
seated properly.
There is excessive seal chamber or
stuffing-box cover runout.
The seal chamber or the stuffing-box
cover is not properly seated in the
frame adapter.
Re-seat the seal chamber or stuff-
ing-box cover.
7.2 Alignment troubleshooting
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