11
Troubleshooting
Trouble
Probable Cause
Remedy
Pump will not turn
1) Low pump temperature
Check thermocouple and
control loop for proper
setting/operation. Allow
sufficient heat-up time.
2) Drive malfunction
Verify drive is powered.
Check to assure all alarm
circuits are clear.
Check drive motor current
and speed settings.
Check all drive couplings.
3) Process conditions
Check process conditions
changed
for proper melt tempera-
ture, pressures, viscosi-
ties and materials.
4) Entrained particle
Disassemble and clean
pump; replace any
damaged parts.
5) Possible internal damages
Disassemble and clean
pump; replace damaged
parts. Consult factory.
Excessive seal
1) Worn seal plate
Replace seal plate and
assembly leakage
coupling if necessary.
2) Drive shaft bottoming
Readjust drive shaft.
in coupling slot
3) Insufficient inlet pressure
Increase inlet pressure.
4) Worn packings*
Replace packings.
Reduced pump efficiency
1) Worn gear(s)
Replace worn gear(s).
2) Worn bearings
Replace worn bearings.
3) Process conditions
Consult factory for
changed
clearance recommenda-
tions on new process
conditions.
* A minor seal leak or weep is not abnormal and may be
desirable for lubricating the seal surfaces.
