Pusher vibration

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Hubie
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Pusher vibration

Post by Hubie » Thu Jul 09, 2020 11:57 am

Hi all,
Hoping to solve a mystery today. While riding at about 80kph there is a vibration coming from the rear in the form of a regular pulse. Doesn't happen at slower speeds.

Any help on where to start would be great.

Cheers,
Hubie.
The early bird gets the worm, but the second mouse gets the cheese!

2012 Ural Retro LH chair
1992 Kawasaki ZZR60
1985 Kawasaki GPR600r
1956 Royal Enfield Super Meteor
1954 Royal Enfield Bullet 500

Melbourne, Australia.

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Lmo
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Re: Pusher vibration

Post by Lmo » Thu Jul 09, 2020 12:22 pm

Might be wheel bearings loose or lacking lubricant. Remove wheel and inspect.
See > http://myural.com/adjustment_and_service_of_wheel.htm

Final drive issue comes to mind.

Might be any, or a combination of:

U-Joint(s) failing/failed

Pinion bearing(s) failing/failed; item 20 & 12

Ring gear bearing(s) failing/failed; one is a tapered roller bearing (item 35); other is needle bearing (item 29)

Missing gear teeth from any of the above.(items 21 & 28)

Only way to determine (other than U-joint problem) is to remove final drive and break it down. And as scary as that sounds
it's not really that bad...

Removal: http://myural.com/final_drive_removal__installati.htm
Repair: http://myural.com/Final%20Drive%20Repai ... %202wd.htm (note, this is for 2WD, but essentially the same process).

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Hubie
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Re: Pusher vibration

Post by Hubie » Thu Jul 09, 2020 12:55 pm

Thanks mate. Is there a rebuild kit I can buy?
The early bird gets the worm, but the second mouse gets the cheese!

2012 Ural Retro LH chair
1992 Kawasaki ZZR60
1985 Kawasaki GPR600r
1956 Royal Enfield Super Meteor
1954 Royal Enfield Bullet 500

Melbourne, Australia.

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chaos2
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Re: Pusher vibration

Post by chaos2 » Thu Jul 09, 2020 12:58 pm

Might also be a good idea to check the wheel for lateral & radial runout, spoke tightness and balance the tire.
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Lmo
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Re: Pusher vibration

Post by Lmo » Thu Jul 09, 2020 7:28 pm

Hey Hubie... I don't know what your situation is down there parts-wise, where they come from, etc. I'm not familiar with a final drive parts 'kit' per se; it's just a matter of getting in there and seeing what's going on, and ordering individual parts as needed.

Lots of write-ups on the subject. What's your situation 'mechanical skills-wise' ?

Try this search method... on the URL line type site:sovietsteeds.c_m final drive repair; add the 'o' in com, and leave a space after 'com'. This search method works better than most 'site search engines', and it works on virtually every other website as well.

here's some results > https://www.google.com/search?client=fi ... ive+repair
Lew Morris
Dnepr w/ '06 Ural Drive Train
C5 Power Arc
125/42 jets
Drilled slides/
.030" shims

1973 BMW R75/5 (original owner)
1947 HD FL (long gone, forever regretful)

Hubie
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Re: Pusher vibration

Post by Hubie » Fri Jul 10, 2020 1:05 am

Thanks fellas. Mechanical skills aren't a problem. I've been restoring classic british iron for the past dozen years and three of the bikes on in my list were built by me. I'm sure I'll get my head around it.

Cheers.
Hubie.
The early bird gets the worm, but the second mouse gets the cheese!

2012 Ural Retro LH chair
1992 Kawasaki ZZR60
1985 Kawasaki GPR600r
1956 Royal Enfield Super Meteor
1954 Royal Enfield Bullet 500

Melbourne, Australia.

Hubie
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Re: Pusher vibration

Post by Hubie » Fri Jul 10, 2020 3:50 am

Hi all, I got the back wheel up off the ground today, there is no detectable play, balance issues or bearing noise.
When I rotated the wheel and watched the drive shaft I did notice that there's a tiny bend in it which I can see when the back wheel is spun. Also the coupling makes a fairly squeaky rubbery noise at the same time.
Could a slight bend in the shaft be the source of my vibration?
The early bird gets the worm, but the second mouse gets the cheese!

2012 Ural Retro LH chair
1992 Kawasaki ZZR60
1985 Kawasaki GPR600r
1956 Royal Enfield Super Meteor
1954 Royal Enfield Bullet 500

Melbourne, Australia.

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glebo
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Re: Pusher vibration

Post by glebo » Fri Jul 10, 2020 5:34 am

Hubie wrote:
Fri Jul 10, 2020 3:50 am
Hi all, I got the back wheel up off the ground today, there is no detectable play, balance issues or bearing noise.
When I rotated the wheel and watched the drive shaft I did notice that there's a tiny bend in it which I can see when the back wheel is spun. Also the coupling makes a fairly squeaky rubbery noise at the same time.
Could a slight bend in the shaft be the source of my vibration?
I would suspect a slight bend would cause the shaft to be out of balance. So, I think that would cause some sort of vibration. I'd start with the easy button stuff first. The shaft, spokes, wheel balance etc, then maybe go into final drive...

Good luck. Let us know when you find out the fix or how you "cured" it...
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Re: Pusher vibration

Post by Hubie » Mon Jul 13, 2020 1:42 am

Okay, spoke tension looks good, I detect no noticeable wheel balance or truing issues. I have removed the final drive and managed to separate the shaft from the uni joint coupling (it was rather rusted!) The shaft appears straight, although when I button everything back up, it doesn't seem centreed still.
I suspect the donut may be a a problem, and also the uni joint is rather bound up.
Perhaps replacing both of those will solve the problem. Thoughts appreciated and stay tuned!

Cheers,
Hubie.
The early bird gets the worm, but the second mouse gets the cheese!

2012 Ural Retro LH chair
1992 Kawasaki ZZR60
1985 Kawasaki GPR600r
1956 Royal Enfield Super Meteor
1954 Royal Enfield Bullet 500

Melbourne, Australia.

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Re: Pusher vibration

Post by treebone » Mon Jul 13, 2020 10:19 am

My 15 sportsman had a vibration, the donut had a pronounced wobble, the final drive pinion seal was leaking as well.
Ordered a donut and pinion seal.
I discovered the donut was bone dry and was stuck on the forks, the splines were bone dry as well.
Lubed the splines with 65% molybdenum grease, backed off the donut from the forks and sprayed silicone tire black on it for lube, replaced the pinion seal and reassembled all.
Vibration is back to a normal level and the leak is gone.

Hope your solution is as simple as that.
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Re: Pusher vibration

Post by CrankyTom » Thu Jul 16, 2020 8:13 am

Had that same pulsed vibration,only at certain speeds on my 2012 - turned out to be just slightly out of balance tires.
My theory is that the tires rotate at slightly different speeds due to wear and when they happen to sink up the vibes get noticeable,kind of a harmonic vibration thing.
And before anyone recommends Dyna Beads,forget it - that's what was in the tires when this happened.I know some people like them but IMO they just plain suck.and even with the filtered valve stems I'd still wind up with the valves leaking occasionally.
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Re: Pusher vibration

Post by Lokiboy » Thu Jul 16, 2020 8:16 am

agree with cranky Tom. Don’t know how you’ve balancing your tires, but “Ride On” has performed beautifully these past few years for me.

Unless the donut/coupler has wallowed out I wouldn’t mess with it. You can use a good lubricant such as bicycle chain oil that does a good job around the holes and forks to keep the rubber pliable.
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Re: Pusher vibration

Post by Hubie » Fri Jul 17, 2020 4:36 am

G'day all,
The universal joint was buggered, have installed a new one along with a new donut. Went for a short spin and it's 10 times better. There's still the tiniest but of vibration but I don't expect there to be none on and older bike. Next step is to swap the pusher wheel with the one on the chair, that should hint at any wheel balance issues I can't detect by eye.
I tried to remove it today however, it appears to be stuck on!

Cheers,
Hubie.
The early bird gets the worm, but the second mouse gets the cheese!

2012 Ural Retro LH chair
1992 Kawasaki ZZR60
1985 Kawasaki GPR600r
1956 Royal Enfield Super Meteor
1954 Royal Enfield Bullet 500

Melbourne, Australia.

Hubie
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Re: Pusher vibration

Post by Hubie » Sat Aug 01, 2020 1:04 am

Time for an update,
I managed to swap the wheels - no different, fitted a new driveshaft and universal joint and there's now no pulse as before. There's a few vibes, expected of a hard mounted flat twin. Very pleased. Now have to replace the o ring on the clutch pushrod. Tiny leak from that.

Cheers,
Hubie.
The early bird gets the worm, but the second mouse gets the cheese!

2012 Ural Retro LH chair
1992 Kawasaki ZZR60
1985 Kawasaki GPR600r
1956 Royal Enfield Super Meteor
1954 Royal Enfield Bullet 500

Melbourne, Australia.

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Re: Pusher vibration

Post by Snakeoil » Sat Aug 01, 2020 10:47 am

Since you solved your problem, allow me to go off on a slight tangent. I see you have a LH chair on your Retro. Are the mounts factory? Or did someone modify your Retro? Is the door for the tub also on the left? I've never seen a LH Ural rig and am just curious.
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Rob
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