When using any PTO driven implement with a tractor, the PTO speed at which it is designed to operate is 545 PTO rpm which corresponds to 1500 (or 3/4 throttle) on your tractor. The Engine develops maximum torque between 1200 and 1700 engine rpm. You don't vary from that and it will operate just as it was intended to do. If you are having problems with excessive fuel consumption then you should check the settings of the Carburettor and make sure that the Air Cleaner is clean and clear and serviced daily (change the oil daily) If you do adjust the Carburettor never set the main jet less than 1 turn open in an attempt to make the tractor more economical or you will burn the exhaust valves. If you need the information about setting the carburettor, email me and I will send it you. There is more than one type of main jet used on these Carburettors, so the adjustments are not all the same. Using 4th Gear is far too fast for any PTO mower work and should be discouraged. The problem will be if the crop you are cutting is of sparse growth. The mower will be set-up from the manufacturer with a gearbox ratio to handle most conditions. Below 1000 rpm the Engine Governor will not always operate properly. John(UK)fergusontractors@hotmail.com
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