PTO shaft size

bones66 · Sep 28, 2020

If the tractor pto has 6 splines and it is a 1 3/8 can I assume the other end of the shaft which fastens to the Bushhog gearbox and has 6 splines is also 1 3/8?

Sawyer Rob · Sep 28, 2020

bones66 said:
If the tractor pto has 6 splines and it is a 1 3/8 can I assume the other end of the shaft which fastens to the Bushhog gearbox and has 6 splines is also 1 3/8?

Depends, IF the rotary cutter was made for a 1000 RPM tractor, then NO, also some really old import rotary cutters even turned the opposite direction. (by todays standards)

SR

workinonit · Sep 28, 2020

A lot of them have something like an 1 1/8" keyed shaft.

WranglerX · Sep 28, 2020

Never assume.... Always use ruler...

Dale

ericm979 · Sep 28, 2020

Easy way to find out: try connecting the tractor end to the implement. If it's proper 6 spline 1 3/8 the detent ball should lock on too.

bones66 · Sep 29, 2020

Sawyer Rob said:
Depends, IF the rotary cutter was made for a 1000 RPM tractor, then NO, also some really old import rotary cutters even turned the opposite direction. (by todays standards)
SR

I’m possibly wrong but I think 1000 RPM pto shafts have 20 splines (1 3/8) or 21 splines (1 3/4). Thus tractor equipped with both 540 & 1000 outputs cannot be mixed.

workinonit said:
A lot of them have something like an 1 1/8" keyed shaft.

..... but I have 6 spline on both ends. Both ends look identical in size but of course the tractor side has the push detent and the implement side although splined has a bolt pinning (Not a shear bolt) it to the Bush Hog. I want to put a slip clutch in-line and was double checking before I ordered. I couldn’t find dimensions on Bush Hogs website.

CoyPatton · Sep 29, 2020

bones66 said:
I’m possibly wrong but I think 1000 RPM pto shafts have 20 splines (1 3/8) or 21 splines (1 3/4). Thus tractor equipped with both 540 & 1000 outputs cannot be mixed.

..... but I have 6 spline on both ends. Both ends look identical in size but of course the tractor side has the push detent and the implement side although splined has a bolt pinning (Not a shear bolt) it to the Bush Hog. I want to put a slip clutch in-line and was double checking before I ordered. I couldn’t find dimensions on Bush Hogs website.

Pull the PTO shaft and see if the tractor end will fit on the gearbox end. You are trying to run it connected this way, just doing a dirty size check! If it does not fit as tightly as it does on the tractor PTO stub, go buy an inexpensive caliber and measure the gear box shaft diameter. Calibers can be bought most anywhere from harbor freight, Lowes, home depot and on and on.

WranglerX · Sep 29, 2020

Makes lift really easy for less the a cup of Starbucks....

6 In. Utility Caliper

Then there is the low end technology ...

6 in. Composite Digital Caliper

And the go up from there...

Dale