There isnt a round part on top. It has a flat metal plate and a gasket on top. Inside the valve will be a spring and brass ball. There is a square rod on the front that usualy rusts up but it comes loose easy if you soak it in oil. Might take a few hits with a rubber mallet too. Then there is an arm that pivits that lifs the square rod. To hard to explain it all here.
They were all horse drawn as far as I know but later models you could get with a motor or to use with a tractor. If you got one to use with a tractor then the seat on the barrell didnt come with it. I also think that is why the lift arm for the floating sub frame was moved to the front where the planters lifted the sub frame instead of the guy on the barrell. Yours have the one lift arm by the barell on the right hand side?
I can copy a book I have that a friend here sent me and mail it to you. In fact I have two differant books depending on what kind you have.
Click on the email link and send me an email and we can go from there.
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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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