Re: PTO/RPM

Posted by RP3 on April 01, 2007 at 09:22:24 from (216.229.79.219):

In Reply to: PTO/RPM posted by oldcraneguy on April 01, 2007 at 08:22:34:

The orginal "standard" PTO speed was 540rpm and the gears to
drive it were designed to give this speed at an optimum rpm for
the particular engine of the tractor (generally at about 3/4
throttle).

SInce horse power is torque x rpm, at 540 rpm the torque
required to deliver really high levels of power to an implement
would require an enormous PTO shaft to prevent twisting it off.
Therefore, the 1000rpm PTO standard was developed.

At the higher shaft speed, only about 1/2 of the torque is
needed to deliver the same power to the implement. The
implements that use it are designed for the higher speed and
compensate for the higher rpm with their internal gearing.

A 4 foot mower will likely be designed for a 540rpm PTO speed.
I suspect the shaft will not even fit to the 1000 output shaft on
the tractor.

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