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LUCCA Tempo: Inspecting the Steam Valve Stem

If your steam wand isn't fully closing or has a persistent leak, here's how to inspect the valve seat gasket or replace the valve stem.

Tools required:

  • 17mm combination wrench
  • 18mm combination wrench
  • 2mm hex key (optional
tempo_steam_valve_tools


Begin with the machine fully cooled and unplugged from the power source.

  1. Remove the top panel from the machine.

  2. Identify the steam valve:
    tempo_steam_valve_assembly

  3. Loosen the retaining nut using the two combination wrenches.
    tempo_steam_valve_nut_loosen

    To avoid straining nearby connections the following trick may be helpful. Using one hand, pinch the wrenches together like so:
    tempo_steam_valve_trick_01
    tempo_steam_valve_trick_02

  4. Slide the retaining nut off of the valve stem. If necessary, remove the knob.
    tempo_valve_stem_nut_remove

  5. Next, unthread the valve stem until it is free from the machine. If the knob has been removed it may be helpful to temporarily reattach this using the two 2mm setscrews.
    tempo_valve_stem_remove

  6. The valve seat gasket is now visible. Inspect this area and within the valve body for debris that may interfere with seating.
    tempo_valve_seat_gasket

    Note - Adding a little Molykote to the two o-rings on the valve stem and the threads themselves can help smooth out the valve's actuation.