PTO vibration and lift question

araw0727 · Dec 1, 2017

Hi all! I'm just finishing the PTO hookup for a SB60 snowblower. To make sure the "angles" were gonna be OK, I raised the 3PH and manually rotated the auger to inspect for binding. It seemed OK, so I ran the PTO at the lowest speed I could...and it's very unstable at the "highest" 3PH lift. Am I supposed to be disengaging the PTO before lifting the implement to avoid this scenario?

If it matters, the PTO is a cheap chinese inclusion of the SB60, not the USA made one.

Thanks,
Avi

Oldpath05 · Dec 1, 2017

Maybe this can give some clues>>>>>> Driveshaft Angle and Phasing - YouTube

Propeller Shaft U-Joint Phasing - YouTube

zzvyb6 · Dec 1, 2017

Try to keep the tractor pto shaft aligned with the blower's input shaft. Top view angle is ok but the shafts need to be parallel as much as possible. In the side view, adjust the top link to keep the blower input shaft also parallel with the tractor pto shaft as much as possible. Compromise as necessary to keep the up and down angle differences as small as possible.

Reb954 · Dec 2, 2017

A picture may help but one thing to make sure of, are the yokes lined up on the drive shaft? If the drive shaft has been taken apart, then put back together with the yokes out of alignment to each other you will get a lot of binding in the U-joints.

araw0727 · Dec 7, 2017

I'll take a pic, at max lift. When they're in line with each other, no problems at all. It seems like a combination of a short distance from input<->PTO and high lift, but once again, I don't know tractors too well..

Reb954 · Dec 8, 2017

From what I think you are saying, it sounds like the yokes aren't lined up on the drive shaft but a picture of the full drive shaft will confirm that.

If that is the case, pull apart the drive shaft at the spline, rotate one end until the yokes are lined up and reassemble the drive line. If you can't reassemble the drive line while keeping the yokes lined up then rotate one end of the drive line 180 degrees and try reassembling again. This assumes your drive line has splines instead of the triangle shaped slip joint that some drive lines now have.