If you know the top speed of the
tractor you should be able to figure the RPM of the motor at that speed in
D2. Calculate the number of feet it travels in 1 minute at that speed
(FPM); 5280 X top speed then divided by 60 = FPM. Measure the exact
distance your tractor moves for 1 revolution of the back wheel (It dependes on
the size of the tires), and divide that into the FPM. This is the RPM
of the drive wheel. Multiply the wheel RPM by the gear ratio of D2 to
get the MOTOR RPM at that speed.
By working backwords you can get
close to the top speed in the other gears using their gear ratios.
Allthough the motor may run a little faster in those gears because it has less
load on it.
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