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Steam Tap Rebuild and Repair Guide

Major VersionM

by randy@lamarzocco.com

  1. Shut down steam module by turning power switch to the middle position and let cool down.
    • Shut down steam module by turning power switch to the middle position and let cool down.

    • Open the steam tap(s) and dispense until steam ceases. This will ensure that no steam pressure is built in the boiler.

  2. Remove steam tap top cap by loosing the three M6 set  screws holding it to the tap tube. The cap will then pull up from the tap tube. (Newer caps will have slotted set screws). Remove steam wand from tap assembly by removing the steam wand acorn nut using a 22mm wrench or adjustable wrench (spring, bushing, shim(s) and teflon ring).
    • Remove steam tap top cap by loosing the three M6 set screws holding it to the tap tube. The cap will then pull up from the tap tube. (Newer caps will have slotted set screws).

    • Remove steam wand from tap assembly by removing the steam wand acorn nut using a 22mm wrench or adjustable wrench (spring, bushing, shim(s) and teflon ring).

    • Teflon rings can be discarded. An extra spacer may need to be inserted to compensate for its absence.

  3. Remove handle and seat valve assembly from tap tube by placing the handle in dispensing position and lifting up.
    • Remove handle and seat valve assembly from tap tube by placing the handle in dispensing position and lifting up.

  4. Remove the lever bracket and handle by loosening both the fixing bolt and set screw located on the lower portion of the handle bracket. Slide the bracket and handle assembly off the seat valve body.
    • Remove the lever bracket and handle by loosening both the fixing bolt and set screw located on the lower portion of the handle bracket.

    • Slide the bracket and handle assembly off the seat valve body.

  5. If you need to remove or replace the handle, remove the shoulder bolt with a ⅛” Hex wrench and the handle will come out of the bracket. Remove the seat valve drive shaft by pulling up and away from the valve body.
    • If you need to remove or replace the handle, remove the shoulder bolt with a ⅛” Hex wrench and the handle will come out of the bracket.

    • Remove the seat valve drive shaft by pulling up and away from the valve body.

    • Remove the two o-rings, clean the part and replace with new o-rings - (PN: M-0110-02)

    • We have made a switch from a stainless drive shaft to a PEEK drive shaft. If you do not have the PEEK drive shaft contact Modbar support.

    • It is necessary and helpful to apply a small amount of plumbers grease to the o-rings before installing.

  6. Using two wrenches (22mm), disassemble the valve body and replace internal components. Replace seat valve stop piece w/gasket (M-0112-01)
    • Using two wrenches (22mm), disassemble the valve body and replace internal components.

    • Replace seat valve stop piece w/gasket (M-0112-01)

    • Replace seat valve spring (M-0113-01)

    • Using a pick to remove the old O-ring, replace seat valve supply fitting O-ring (P-0062-01). Lubricate O-ring with Silicon lubricant before reassembling.

    • Pictured is the latest version of the steam valve. Your valve body may look different, but the process is the same. Older seat valve supply fittings (P-0100-01) can be upgraded to the one in the picture.

  7. Remove and inspect the o-ring from the inside of the steam wand acorn nut, if necessary replace with. You will need to remove the tip from the steam wand to take the nut completely off, using a 12mm Open End Wrench.   PN:  M-0145-01
    • Remove and inspect the o-ring from the inside of the steam wand acorn nut, if necessary replace with. You will need to remove the tip from the steam wand to take the nut completely off, using a 12mm Open End Wrench. PN: M-0145-01

  8. To re-attach the handle bracket assembly to the seat valve, position the bracket onto the top of the valve. Ensure seat valve drive shaft is fully inserted into the valve body. With the handle in the upright and normally off position, lower the bracket onto the valve body until the cam on the bottom of the handle just makes contact with the top of the drive shaft.  Be sure the handle is not forcing the drive shaft down while in the off position (handle up).
    • To re-attach the handle bracket assembly to the seat valve, position the bracket onto the top of the valve. Ensure seat valve drive shaft is fully inserted into the valve body.

    • With the handle in the upright and normally off position, lower the bracket onto the valve body until the cam on the bottom of the handle just makes contact with the top of the drive shaft. Be sure the handle is not forcing the drive shaft down while in the off position (handle up).

    • Orient the handle so it is facing squarely forward.

    • While holding the bracket and handle assembly snugly against the drive shaft tighten the bracket fixing bolt,

    • We also recommend using a wet lubricant such as bike lube on the surface of the handle where it meets the drive shaft for smoother operation. Lubrication should be applied to the area highlighted in blue.

  9. Apply rubbermax or non-permanent loctite to the set screw, and then tighten the set screw in place. Apply rubbermax or non-permanent loctite to the set screw, and then tighten the set screw in place.
    • Apply rubbermax or non-permanent loctite to the set screw, and then tighten the set screw in place.

  10. Reinstall rebuilt seat valve assembly in the tap tube, with handle in dispense position. Apply permabond liquid thread sealant to the outside of the acorn nut fitting, as shown. Alternately, thread tape can be used. This step is necessary to prevent steam from leaking inside the tap tube during normal operation. Prepare the steam wand components for installation. Slide the teflon ring around the outside of the acorn nut fitting. Place the spacers, spring, and bushing inside the fitting.
    • Reinstall rebuilt seat valve assembly in the tap tube, with handle in dispense position.

    • Apply permabond liquid thread sealant to the outside of the acorn nut fitting, as shown. Alternately, thread tape can be used. This step is necessary to prevent steam from leaking inside the tap tube during normal operation.

    • Prepare the steam wand components for installation. Slide the teflon ring around the outside of the acorn nut fitting. Place the spacers, spring, and bushing inside the fitting.

    • A good starting point for the amount of spacers to use is typically 4. If the valve body is loose after the acorn nut has been tightened all the way, remove a spacer. If the valve body is tight but the steam wand is loose, add additional spacers.

    • We have discontinued our white teflon ring. Permabond is still recommended over teflon tape but it is necessary to use one of these to prevent leaks. Additional shims may need to be used to compensate for the missing teflon ring.

  11. Holding the wrench behind the valve assembly to keep it from pressing back, compress the spring using the steam wand ball, and start the acorn nut on the acorn nut fitting. Finish tightening the assembly with a wrench, and move the steam wand around to bed in the acorn nut o-ring. If the feel of the wand is too tight or too loose, shim spacers may be added or removed to adjust this feel. Please contact Modbar support if you need more shim spacers.
    • Holding the wrench behind the valve assembly to keep it from pressing back, compress the spring using the steam wand ball, and start the acorn nut on the acorn nut fitting.

    • Finish tightening the assembly with a wrench, and move the steam wand around to bed in the acorn nut o-ring.

    • If the feel of the wand is too tight or too loose, shim spacers may be added or removed to adjust this feel. Please contact Modbar support if you need more shim spacers.

  12. Replace top cap and fix in place by tightening the 3 set screws, proper alignment of the cap is most easily achieved by tightening the front two screws first and finishing with the rear set screw.
    • Replace top cap and fix in place by tightening the 3 set screws, proper alignment of the cap is most easily achieved by tightening the front two screws first and finishing with the rear set screw.

    • Turn the module's power switch clockwise to the right position, allow the boiler to heat to temperature, inspect for leaks, and verify proper function.

Finish Line

One other person completed this guide.

Attached Documents

Modbar Support

Member since: 07/22/2014

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