Zenith Planetary Gear Pump

Trouble Probable Cause and Remedy
  • Pump will not turn

  • Process temperature too low:  check thermocouple and control loop for proper setting or operation.

  • Drive malfunction:  verify that drive powered.  Assure all alarm circuits are clear.  Check drive motor current and speed settings.  Check drive couplings.

  • Process conditions changed:  check process fluid for proper melt temperature.

  • Entrained particle:  disassemble and clean pump.  Replace any damaged parts.

  • Internal damage:  disassemble and clean pump.  Replace any damaged parts.

  • Incorrect installation:  check mounting arrangement.  Check evenness of heating and shaft alignments.

  • Lack of lubrication:  journal bearing design may not be adequate.

  • Interference fit of moving part:  measure clearances and correct if possible.
  • No flow from pump
  • Same as above:  same as above.
  • Pump rotation:  correct drive arrangement or power leads.
  • Reduced pump efficiency
  • Worn gear(s):  replace worn gear(s).
  • Worn side plate(s):  resurface or replace worn plate(s).
  • Worn gear plate:  replace gear plate.
  • Worn shaft and/or bearing holes causing excessive leakage:  replace shaft and/or side plate(s).
  • Seal leakage
  • Worn or scratched seal faces:  resurface or replace.