The PTO will not provide power with the main clutch pushed in. It will if the Heisler lever is in either position. The Heisler unit is a high capacity friction clutch, that is disconnecting one set of final drive pinion/Bull gears. This is the same as having a steering clutch in a dozer, except this has a differential and when one side is disconnected, the internal gears act like that wheel is on ice, and the other wheel does nothing. Thus the tractor stops, and the trans keeps going. powering the PTO shaft. It is still necessary to use the main clutch to shift gears, as all internal gears will turn and grind if the main clutch is not pushed in when shifting. JimN
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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