• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar

PMS Instrument Company

  • Home
  • About Us
    • Biography of Henry Dixon
    • Biography of John Joly
    • Biography of Per Scholander
    • History of PMS Instrument – Joe Zaerr
    • History of the Scholander Pressure Chamber
  • Products
    • Model 600
    • Model 600D
    • Model 600-EXP Super Chamber
    • Model 615
    • Model 615D
    • Model 670
    • Model 1000
    • Model 1505D
    • Model 1505D-EXP
    • Model 1515D
    • Pump-Up Chamber
  • Agriculture
    • Using a Pressure Chamber with wine grapes
    • Using a Pressure Chamber with Almond
    • Using a Pressure Chamber with Walnuts
    • Using a Pressure Chamber with Prunes
    • Stress levels, crop tables and information
  • Maintenance
  • Resources
    • References
  • How to Order
  • Contact Us
  • Show Search
Hide Search
You are here: Home / Instrument Maintenance / Changing Piston Cup on Pump-Up Chamber

Changing Piston Cup on Pump-Up Chamber

Warning!Important Safety Information
« Click Here

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.

Primary Sidebar

Maintenance Topics:

  • Instrument Maintenance
    • Adjusting the “Brass” – Control Valve
    • Adjusting the “Stainless Steel” – Control Valve
    • Cleaning the O-Ring on the lid
    • Cleaning the Safety Valve
    • Digital Gauge Battery Replacement
    • Instrument Quick-Connect Couplers
    • Maintenance for Compression Gland Lid
    • Maintenance for the Portable Tank
    • Testing the instruments safety features
  • Maintenance for the Pump-Up Chamber
    • Pump-Up Chamber is leaking
    • Pump-Up Chamber will not increase in pressure
    • Basic Maintenance of Pump-Up Chamber
    • Changing O-ring on Lid of Pump-Up Chamber
    • Changing Piston Cup on Pump-Up Chamber
    • Lubricating the piston of the Pump-Up Chamber

Copyright © 2023 PMS Istrument Company | LOGIN