40-20 871-400 Variable Force Gas Spring

INSTALLATION INSTRUCTIONS

For standard compression gas springs we advise the use of ball joints to alleviate possible side loading, and uneven wearing of the piston rod/seals. Install the strut, piston rod down, for optimum lubrication of the guide and sealing system at all times. Always install the strut in its relaxed state. It is advisable to keep the strut in a single plane of movement. Failure to adhere to this advice may result in a reduced lifespan of the strut. Ensure that the end fittings are tightly fastened onto the thread of the gas springs prior to fitting. If the end fittings require aligning, the piston rod of the gas spring can rotate inside the body (cylinder). Place and hold the piston end fixing on a flat surface, grip the cylinder and firmly twist it until the end fitting is aligned correctly.

FITTING BRACKETS

When utilising a bracket with a ball stud/end, the procedure to fit it to the relevant ball joint fitting is as follows:

• Remove the retaining clip from the ball socket by rotating it from around the collar of the socket, and then pull it out from the two locating holes.
• Ensure the ball socket is fully tightened onto the thread of the strut. Then, using a vice or pair of pliers, grip the ball stud and with a rotating motion, remove the ball stud from the socket.

FORCE ADJUSTMENT

• Fit the gas springs with the cylinder uppermost; this prevents oil escaping while venting, and keeps the internal seals lubricated for optimum lifespan.
• Using the allen key provided, undo the grub screw anti-clockwise a quarter turn and vent gas for 1 second, retightening the grub screw. Do not over tighten the grub screw.
• Repeat this process on the second gas spring, venting an equal amount. Only release the pressure in short bursts to avoid venting too much gas. Each 1 second burst will lower the force by approximately 20N - 50N depending on the range.
• Test the application by attempting to close the panel and repeat the venting process if the struts are still too powerful.
• Once the gas springs have been adjusted, gently brush the grub screw with washing up liquid. If gas can be seen bubbling through the liquid then the grub screw requires further tightening.

For advice on how to safely mount gas springs call our technical line: +1 (860) 584-0594.

Gas springs are filled with high pressure nitrogen, they should be protected from damage; never open, modify, drill, weld or subject gas springs to excessive heat.