Nitrogen Gas Spring GROWTH

Contact Dadco, they are rated (guaranteed!) for 10⁶ cycles.

Do you have them extending abruptly?

They probably have a polymeric (urethane) bumper inside at the end of the extension. These would have set over time.

The springs are made for compression not for lifting, the body of the spring is getting stretched.

What ever the problem with the springs, You need to put a stop on the tooling to prevent crashing.

Thanks for the input, everyone.

Although the installation instructions omit this detail, Dadco advised to maintain a preload on their gas springs. We run many other tools without preload; perhaps I need to use another manufacturer, as this wasn't a problem in the past. The lifters being driven by the pistons have stops, yet there is a design flaw (imported tool) that allows enough tilt to bind the lifters causing the breakeage. What is happening, is that the pressure ring ("stop") is slipping inside the housing wall of the body of the niotrogen cylinder, and in doing so lets the plunger creep upward, at times abruptly. Seems as though Dadco is modifying their design, which previously made them an outstanding supplier. So much for progress.