Posted by rankrank1 on November 09, 2014 at 08:31:33 from (166.137.14.83):
In Reply to: case hand clutch posted by alexis.marcil on November 09, 2014 at 07:34:28:
In function yes, (using the hand clutch stops tractor motion while still powering the PTO), but how the design itself works then No.
The M&W hand clutch was an after thought add-on that simply stopped tractor motion by opening up the differential to maintain power to the PTO. In essence the axle is still being driven. As most know take a 2wd drive tractor and put 1 tire on a patch of ice while the other sets on dry ground. All the power in an open differential goes to the tire with the least resistance. In this case the one on ice. M&W hand clutch does the same thing. That axle becomes the one with the least resistance and where all the power goes.
Case and (Allis who also use a hand clutch) for the pseudo live PTO in their early years all broke the input power ahead of the transmission I do believe. So the tractor was designed from the get go for it. The Allis hand clutch even ran in a bed of oil and could be slipped for prolonged periods without damage.
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