I was under the impression that tel-a-depth was only a position control system and the draft control was a separate mechanical component of the hitch (controlled by the lever with the clicks on the left side).
By position control I mean the relative position of the lever in its operating range was representative of the cylinder's stroke position. In theory you could put the cylinder to the same position any time without a mechanical cylinder stop, and were able to temporarily bypass the setting with only the movement of the lever instead of getting off the tractor to fiddle with a stop clamp. This is done with a special hydraulic valve in the valve bank and a feedback linkage connected to the rockshaft. The valve and feedback linkage act like a 3 way household switch and 2 kids playing lights on lights off, only with fluid instead of electrons.
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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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