There are several charts explaining pulley size of implment----pully size on tractor ---equal set RPM's.
As a side note, but if you twist the belt on say a WD 45, and you straddle the belt, and pinch it together with your hands between your knees--then clap tighter with your knees---you can put that tractor on it's knees, and it will never start the belt, just kill the engine.
I once had a step by step printed page dealing with the chart, and also what you needed to do to correct a belt problem.
Many folks are unaware that with a two cylinder tractor putting it's ALL into a belt, the belt will jump and flop around.
To help this on a straight belt, you twist the belt on one pulley---not to be confused with a twisted belt to reverse the direction. By turning the belt inside out on one pulley, the belt will settle down 90%.
A long belt can be effected by a strong side wind also.
A flat pulley is more apt to toss a belt. You can help this by wrapping duck tape in the center of the pulley, to make it a crown effect......and eliminate some belt throwing issues.
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Today's Featured Article - History of the Nuffield Tractor: Part 2 - by Anthony West. In February 1953 production of the ETC T.V.O engine started, ready for the March 1953 press announcements. The new TVO engine had a number of improvements which resulted in a 10 per cent more power (43bhp as against 38 bhp on the earlier engine) and 10 per cent more fuel economy. Some of the improvements are listed below: Redesigned combustion chamber, improved spark plugs and positioning, plug size 14mm(earlier size 18mm).
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