La Marzocco GS3
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La Marzocco GS3: Pump Check Valve

Below are photo instructions for replacing the pump check valve on a La Marzocco GS3 espresso machine.

Tools required:

  • 13mm socket wrench
  • adjustable wrench

Once check valve is replaced reinstall braided line and test for flow.

Remove left side panel.

La Marzocco GS3: Rebuilding the Vacuum Breaker

Swap check valve:

La Marzocco GS3: Rebuilding the Vacuum Breaker