that is the old power lift system. it operates with a trip rope. all the old machinery used this before hydraulics took over. found on plows, cultivators, tillers, and seed drills. even if you are stationary and pull the rope the plow should fall down. when you are moving the wheel rotates and locks it in the down position.when you come to the end of the furrow you pull the trip rope and the rotating wheel wheel locks it in the up position. not much in there , just a cam and roller. might want to take it apart and give it a good cleaning as it may be full of dirt and dried grease preventing it from operating properly. you can then check for wear were the roller operates.
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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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