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) alignment
cannot be obtained (angular 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 align-
ment.
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.
7.3 Assembly troubleshooting
Table 14: Troubleshooting procedure
Symptom
Cause
Remedy
There is excessive shaft end play.
The internal clearance of the bearings
is excessive.
Replace the bearings with a bear-
ing of the correct type.
The thrust-bearing end cover is loose.
Tighten the screws.
There are too many shims under the
thrust bearing end cover.
Remove the individual shims to
obtain the proper thickness.
The runout for the shaft is excessive.
The shaft is bent.
Replace the shaft.
The runout for the bearing-frame flange
is excessive.
The shaft is bent.
Replace the shaft.
The flange of the bearing frame is dis-
torted.
Replace the bearing-frame flange.
The runout for the seal-chamber cover
is excessive.
The seal-chamber cover is improperly
seated on the frame.
Replace or re-machine the seal-
chamber cover.
There is corrosion or wear on the seal-
chamber cover.
Replace the seal-chamber cover.
The runout for the impeller wear ring is
excessive. (not applicable on 3700LF
and 3700LFI)
The shaft is bent.
Replace the shaft.
The wear ring was machined improper-
ly.
Replace or re-machine the impel-
ler.
7.2 Alignment troubleshooting
Model 3700, 3703, 3710, 3700LF, 3700LFI API Type OH2 / ISO 13709 1st and 2nd Ed. / API 610 8/9/10/11th Ed. Instal-
lation, Operation, and Maintenance Manual
119
Summary of Contents for Goulds Pumps 3700
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