This gas spring provides controlled lifting and damped closing force for the cab door on the host tractor. It uses compressed nitrogen to exert a constant 250-newton extension force through its stroke, counterbalancing the door weight so the operator can position it with one hand. The spring is filled and sealed at the factory; no field adjustment or recharging is possible. When the seal or piston rod wears, the door will drift downward or fail to stay open. The manufacturer, Stabilus, produces the original-equipment gas spring for this application, and the thread dimensions match the factory brackets so no adapter is needed. On replacement, ensure the rod faces downward to keep the oil seal lubricated.