How well the Charlyn PS works at low speed depends a lot on where it get's its hydraulic pressure.
A dedicated belt-driven PS pump provides very little low flow low engine RPMs. This results in slow (or even no) steering assist at slow speed.
However if the tractor has live hydraulics and the Charlyn is supplied by a priority valve (flow divider) from the live pump, the PS will provide full assist even with the engine at low idle. (The Charlyn on my Super M works from the live pump - it works fine even with the engine idle and the tractor stationary.)
Of course a tired pump or a worn torque generator on either type system will diminish the power assist.
I presume your M is equipped with a belt-driven pump?
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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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