Changing Piston Cup on Pump-Up Chamber

Changing Piston Cup on Pump-Up Chamber

Changing the piston on a pump up chamber PMS Instruments

To change the piston cup on your Pump-Up Pressure Chamber you will need the following:

  1. New Piston Cup (shown above)
  2. One Inch (1”) Standard wrench
  3. Thread locker – (Loctite 242)
  4. 7/64” Allen wrench (Hex key)

Changing the piston on a pump up chamber PMS Instruments

First loosen the outer nut of the fitting that holds the Compression Tube into the chamber using the 1” Standard Wrench

Changing the piston on a pump up chamber PMS Instruments

Pull the Compression Tube out of the fitting.

The assembly should look as above.

Changing the piston on a pump up chamber PMS Instruments

Wipe the Piston assembly clean of all grease and debris.

Changing the piston on a pump up chamber PMS Instruments

Using the Allen Key, remove the cap screw located at the end of the Piston Assembly.

Turn the cap screw counter-clockwise (left) to loosen.

This screw has been locked with thread locker and so might be tight.

Changing the piston on a pump up chamber PMS Instruments

The assembly should now look like this.

Changing the piston on a pump up chamber PMS Instruments

Clean all the parts and change the rubber piston cup with the new one.

Put the cap screw back through the brass part and put some thread locker on the exposed threads.

Changing the piston on a pump up chamber PMS Instruments

Push the brass part through the Piston Cup and make sure it is properly seated.

Use the Allen Key to thread the part back into the Brass Piston base.

Tighten hand tight.

Changing the piston on a pump up chamber PMS Instruments

Grease the piston with lithium based “white grease” as noted in instructions.

Clean the end of the Compression Tube and insert back into the fitting.

Changing the piston on a pump up chamber PMS Instruments

Make sure all the ferrules and nut are on properly as shown above.

Tighten nut finger tight and then tighten one flat (1/6 of a turn) with 1 inch wrench.