RPM for 9n PTO

[Matthew Maguire]

I am looking at a gator pump for my tractor to pump from an irrigation ditch and the options are 540 RPM or 1,000 RPM I don't know how many RPM's my PTO runs at. can anyone help?

 

[JMOR]

(quoted from post at 16:15:12 12/14/10) I am looking at a gator pump for my tractor to pump from an irrigation ditch and the options are 540 RPM or 1,000 RPM I don't know how many RPM's my PTO runs at. can anyone help?

45 @ 1500 engine rpm

 

[Dell (WA)]

Matthew........use the 540-rpms specs. That is about 3/4-throttle. Caution: N's PTO's come in 2-sizes. 1-1/8" or 1-3/8" Just measure across the 6-spline flats; simple, eh?

1000-rpm ptos are fine-spline, I don't remember how many splines but more than 6. It should be intuitively obvious fine-spline and coarse-spline don't mate or match. ........Dell

 

[TheOldHokie]

(quoted from post at 16:26:23 12/14/10) Matthew........use the 540-rpms specs. That is about 3/4-throttle. Caution: N's PTO's come in 2-sizes. 1-1/8" or 1-3/8" Just measure across the 6-spline flats; simple, eh?

1000-rpm ptos are fine-spline, I don't remember how many splines but more than 6. It should be intuitively obvious fine-spline and coarse-spline don't mate or match. ........Dell

Don't count on that - plenty of tractors have operator selectable 540 and 1000 RPM speeds for the 1-3/8 x 6 spline rear PTO - my Kubby is one.

TOH

 

[Bruce (VA)]

Rule of thumb is 3/4 throttle gets you 540 PTO RPM. Or, you can do the math. PTO RPM = Engine RPM divided by 2.75. Max engine speed is supposed to be 2200 RPM. 3/4's of 2200 RPM is 1650 RPM. 1650 divided by 2.25 = 600 RPM. Close enough for government work.
50 Tips

 

[lha]

You can get a cheap tach with a magnetic pickup that sticks on any circular part[pto,driveshaft,etc].That way you can tell what speed it's turning.---lha