This gas strut controls the opening and closing motion of the cab door on the host tractor. It provides a controlled lifting force to hold the door in the open position and dampens the closing action to prevent slamming. The strut is mounted between the door frame and the door panel, acting as a pneumatic spring and damper. Over time, the internal gas pressure can leak past the seals, causing the strut to lose its lifting capacity and allowing the door to drop or close unexpectedly. This replacement strut is manufactured to match the original mounting points and stroke length, so no modification to the door or bracket is needed.