On the PTO lever, as per my manual -1973 Oliver 550. To adjust the clutch, stop engine, release pto lever (push it forward) Remove hand hole cover from under the tractor. The hand hole cover is about in the center of the tractor held in place by four small bolts. Reach through the hand hole and rotate the pto clutch assembly until the adjusting ring lock pin is on the bottom of the assembly. With a screwdriver tip, depress the locking pin and rotate the adjusting ring to the next notch. Clockwise to increase, counterclockwise to decrease clutch engagement pressure. Very easy to do, it may take a few notches to get it adjusted correctly. Good Luck.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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