General Motors, STRUT, 25876306

in this video we're going to take a look at the operation of the lift gate struts on the full-size utilities since these struts are designed to operate in a wide range of temperatures we've come to GMs climatic wind tunnel facility in Warren Michigan to expose them to extreme cold before we go into the cold room let's review the struts design features a strut has two main components the piston and shaft assembly and the strut cylinder inside the cylinder is a mixture of high pressure nitrogen gas and lubricating oil a temperature controlled valve and orifice control the flow of this mixture from one side of the piston to the other since the piston surface area on the side opposite the shaft is larger the gas charge will exert a higher force on this side of the piston even when the gas pressure is the same on both sides this higher force will attempt to expand the strut and if it is enou