Kubota L4760 with Sbp1684 snowblower??

[leonz]

We have come this far with examining the wobble vibration.

If the arc on the paint stripe curve is stationary when the PTO is
spinning at the 540 RPM engine speed and on the ground preferably
on solid ground.

Replacing the existing power take off shaft with a dual constant velocity
power take off shaft will cancel the transmission of vibration to the tractor.

The issue then becomes sympathetic resonance where the torque
delivered to the snow blower is vibrating through the gear box and
the impeller because there is not enough plate steel weight in total to
cancel the sympathetic vibration through the snowblower shroud/housing.

If this is the case having 2 thick steel plates bolted to both sides of the
snowblowers flat steel sections on the front of the shroud may be enough
to cancel out the vibration entirely.

You never see this kind of vibration on silage harvesters because the steel frame
for trailering tongue and the lower body of the harvester is very thick to support
the cutting head and its bearings, the gearbox, the silage blower and the hydraulicly
operated chute and spout.

I am sincerely sorry that you are dealing with this as a consumer as I suspect the
steel thickness on this "snowblower" is much, much too thin.

If the impeller and curved paint line shows no deviation in orbit the only solution is a
Eurocardan PTO shaft like the line master homokinetic 80-AJ-AK PTO shaft sized for
your tractors PTO horsepower as it will cancel the shake at your tractors PTO by
installing the constant velocity joint at the tractor PTO stub shaft.

 

[Fallon]

To me, that looks normal/typical.

Same. My standard 3pt LandPride wiggles a similar bit when running. Check the phasing of the U-joints. That phasing video above is old, but has been my go to for posting on the topic for years. Most modern PTO shafts should be keyed in some way so you can't mix things up, but it can happen.