On the machine shop's rig, they just have a sprocket welded to a sleeve that fits over the end of the crankshaft and a roll pin driven through the hole where the crank pin was.
A chain will not hold up to full-throttle operation very long. They basically idle their tractor around the yard and use it for loading and unloading iron, etc.
I don't have a pressure relief valve on my system, but I DO have a priority flow valve so that the power steering gets oil first. Northerntool.com still has them for around $85 or so.
Here are more pictures that I have of the machine shop rig:
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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.
... [Read Article]
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