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Troubleshooting
Parts
Replacement
When ordering replacement parts, please be sure to include the following information:
1) Pump model number
2) Part number (12-digit) and description
3) Quantity
4) Shipping instructions
Order parts from your local Zenith representative or direct from Zenith.
Trouble Probable Cause Remedy
Pump will not turn 1) Low pump Check thermocouple and control
temperature 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 changed Check process conditions for
proper melt temperature, pres-
sures, viscosities 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
assembly leakage 1) Worn lip seal Replace lip seals.
2) Incorrect water flow Monitor and adjust water flow
to provide correct sealing
temperature.
3) Clogged Rheoseal Disassemble two-piece seal
channel housing and inspect.
Reduced pump
efficiency 1) Worn gear(s) Replace worn gear.
2) Worn bearings Replace worn bearings.
3) Process conditions Consult factory for clearance
changed recommendations on new
process conditions.