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Air Valve Assembly Replacement: CMC 8500e

Air Valve Assembly Replacement: CMC 8500e

Owned by dani.simmonds
Last updated: Apr 01, 2025
4 min read

  • The Air Valve Assembly is located at the top of the Gantry, and controls the plunging of the Head and the plunging of the Blade.

Air Valve Assembly
Gantry
8500e Air Valve Assembly

Tools Needed

7/64” Allen Wrench
3/32” Allen Wrench

Turn Off Air and Remove Hood

  • Turn off the air supply and remove the upper Gantry Cover by removing the one screw that holds it in place.

Turn off the air supply and remove the upper hood

Unscrew Air Valve Assembly From the Gantry

  • Locate the Air Valve Assembly at the top left side of the Gantry by standing in front of the Gantry and looking straight through the wires/Air Lines to the back plate of the Gantry.

  • Locate the two Allen Screws holding the Air Valve Assembly in place.

Locate the Air Valve Assembly

  • Do not adjust the other two screws on the Air Valve Assembly.

  • Use a 7/64” Allen wrench T-Handle to remove the screws securing the Air Valve Assembly to the Gantry.

  • Take note that these screws are tight and may be difficult to remove.

  • Save the screws.

Remove the screws securing the Air Valve Assembly to the Gantry

Unplug Power Plugs

  • Before unplugging the power plugs, note the position of each one.

  • The bottom one, closest to the back of the Gantry, has a red plastic marker.

  • The middle plug has a clear/white plastic marker, and the top plug has no marker at all.

Note the Power Plug Positions

  • Unplug each of them by squeezing gently and pulling them straight out from their housing.

Unplug each of them

Disconnect Air Lines

  • Disconnect the three Air Lines by untwisting the connectors from each other.

Disconnect the three Air Lines

  • Disconnect the Air Lines then remove the old Air Valve Assembly carefully from the Gantry.

Remove the old Air Valve Assembly

Screw in the Replacement Air Valve Assembly to the Gantry

  • Take the screws from the old Air Valve Assembly and place them into the new one.

  • Line up the screws to the screw holes and screw into the back of the Gantry.

  • It is easier to screw one screw in partially and then the other to ensure proper alignment, then go back and tighten them.

Screw the Air Valve Assembly into Place

Connect Air Line Connectors

  • Plug in the Air Lines.

Plug in the Air Lines

  • Match connector colors.

Match connector colors

  • Match airline colors.

Match airline colors

Plug in Power Plugs

  • Plug in the Power Plugs.

  • The plug with the red marker gets plugged into the bottom closest to the back of the Gantry.

 

Plug in Each Power Plug by Squeezing it Gently and Pushing it Straight into the Housing

  • Plug in the plug with the clear/white marker into the top plug.

Plug in Each Power Plug

Last Steps

  • Replace the upper Hood by screwing in the screw that holds it in place. You may have to gently move the Air Lines a bit in order for it to fit snuggly.

  • Turn on the air source.

  • Send back the old Air Valve Assembly to Wizard as directed. You are done.

Replace the upper Hood

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