Kubota L4760 with Sbp1684 snowblower??

[BleedingOrange]

Try lowering the snowblower so it is resting on the ground, and then spin it up to operating rpm. You aren,t going to be using the blower while it is lifted in the air. Like others have mentioned, tighten up the chains on your lift arms while the lift is at its highest point to prevent so much side to side motion. The blower will track much better when it is full of snow at ground level.

 

[leonz]

We disagree,

the 540 rpm rotation speed through the PTO shaft should
not create the radial loading that is indicated here in the
videos.

AT a minimum a new power take off shaft with dual constant
velocity joints is in order here to stop the radial loading and
the shaking.

The new PTO shaft with the dual constant velocity joint
connections is the first thing that should be installed to
solve this as the constant velocity joints would do this
for him.

A Eurocardan AJP or AJK constant velocity power take off
shaft is what is needed here to eliminate the side to side shaking.

The Eurocardan Homokinetic AJP or AJK constant velocity power take off shafts
allow up to an 80 degree angle of power transmission from the tractors
stub shaft to the gearbox of the implement.

 

[Tommyid1]

Just watched your video, with the blower almost on the ground it seemed to have minimal bouncing around.
As you lifted it, it seemed to increase which would point towards u joint angles. Have you tried shortening and/or lengthening the toplink?

I have and it didn’t seem to make a difference at all.

 

[pmsmechanic]

I would mention it to the dealer. He will probably nod his head with a polite smile. You have your videos if there are any warranty issues.

My prediction is that it will operate perfectly fine under load. It will probably get quieter too as parts wear in.

It might pay to disconnect the pto shaft and turn the blower assembly slowly and see it there are any parts that are touching that shouldn't. Also while turning it over by hand see that the impeller isn't warped or welded on off center.

Also as previously mentioned check to make sure the pto shaft is phased correctly.

 

[leonz]

Please remove the rear access panel behind the impeller and ask
your spouse to video tape the impeller closely as it is running at 540 rpm.
If you have a white paint stick all the better as you can paint a single curved
line on the Rear plate of the impeller and video tape the impeller paddle if
as I suspect there is problem with the impeller or its bearings you will see
a wobble in the curved paint lines you applied.

If your serious about purchasing Eurocardan Continuous Velocity PTO Shaft
you can purchase them from Tractor Supply or any large tractor parts dealer
including a MASCHIO implement dealer or any Eurocardan dealer.

 

[airbiscuit]

You need this

 

[Tommyid1]

I would mention it to the dealer. He will probably nod his head with a polite smile. You have your videos if there are any warranty issues.

My prediction is that it will operate perfectly fine under load. It will probably get quieter too as parts wear in.

It might pay to disconnect the pto shaft and turn the blower assembly slowly and see it there are any parts that are touching that shouldn't. Also while turning it over by hand see that the impeller isn't warped or welded on off center.

Also as previously mentioned check to make sure the pto shaft is phased correctly.

The pto shaft appeared to only go on one way. There was a flat male part and a flat female part and I lined them up. I’ll pull it off to verify its correct placement though. I’ll check the mechanism and see if I can feel any play or feel anything touching or anything like that.

 

[Tommyid1]

I’ll take the cover off and slow motion video the impeller with white paint pen

 

[jonsstihl]

are you sure the pto shaft isn't too long and bottoming out as you raise the blower?

 

[leonz]

I would mention it to the dealer. He will probably nod his head with a polite smile. You have your videos if there are any warranty issues.

My prediction is that it will operate perfectly fine under load. It will probably get quieter too as parts wear in.

It might pay to disconnect the pto shaft and turn the blower assembly slowly and see it there are any parts that are touching that shouldn't. Also while turning it over by hand see that the impeller isn't warped or welded on off center.

Also as previously mentioned check to make sure the pto shaft is phased correctly.

It is not out of phase, the out of phase momentum/knock
would have shown up as the propeller shaft began spooling
up to speed.

 

[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.

I wish I could be of more assistance to you as I doubt your dealer will be willing to
bolt two large thick pieces of plate steel to the snow blower frame to cancel the
resonance vibration.

One must think of this like a large speaker with the horn in the speaker vibrating from
the electricity used to deliver the sound to one's ears so to speak but simple resonance
vibration is easier to see in many instances.

 

[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.