La Marzocco Rotary Pump Mechanical Wear or Cavitation

Pump is very loud or makes grinding noises during operation.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Air in water line causing cavitation, worn pump bearings, misaligned pump-motor coupling, restricted inlet causing pump starvation

How to Fix / Troubleshooting

Safety first: Turn OFF and unplug the machine before touching the pump or motor.

Steps:

  • Check water supply: Ensure the inlet valve is fully open and that filters are not blocked. Low inlet pressure can cause cavitation noise.
  • Bleed air: Run water through the hot water tap and group to purge air from the system.
  • Inspect pump mounting: Verify that the pump and motor are securely mounted and that the coupling is intact and aligned.
  • Listen for bearing noise: A grinding or screeching sound often indicates worn motor or pump bearings. In this case, replace the rotary pump assembly or motor.
  • Do not ignore severe noise: Operating a failing pump can cause further damage; schedule service promptly.
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Repair Difficulty

Hard 4/5

Required Part

Rotary Pump Assembly
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