There should be a couple switches on the left side of the seat. Mounted to seat frame below the cushion. One controls air pressure for weight adjustment and as many as 4 for lumbar support. There should also be a seat isolator lock out on the right side or sometimes built into the froward adjust lever. That lets the seat glide on the track a couple inches fore and aft to take out some of the pounding. If it is a Bostrom seat, they have a very hard cushion. I drive Freightshaker semi and finaly got a National seat put in after 400,000 in the original Bostrom. Much nicer!
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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