When was the last time you checked or replaced your rear diff fluid?

 

I have not checked it and I am uncertain if the fella before me did or not. I can certainly check it.

 

My guess is the clutch belt is bad. I had a similar shakin goin on. After I buried the unit in about four feet of snow. Then winched and high rpms in awd got us out then the noise and shaking started. It got me home though. New belt. solved. Note: get the tougher thicker belt when you replace it. It should be around 125 bucks ( for the part) Mine is a rzr 800 ( not a 4 or an xp just a base model rzr 2011) Your kid must have rodded the thing without you knowing. Usually you can smell the belt breaking up and see a bit of rubber smoke. Or you didnt notice. Its really obvious when the belt is bad. It does ride rough. I only had 1000 miles on it when we smoked the belt.
For future belt saving keep the transmission in low when stuck and using high rpm. This is what they told me at the dealer. I had it in high 4x when this part failed.

 

Could it be motor mounts ?

 

I've also seen bowed or bent axles, that can cause the shaking feeling, and you would begin to feel it about 15-20mph.

 

Thought about something like this but wouldn't it shake all the time if an axle was bent? My unit might shake and well it might not. Hardest problems to diagnose are the ones that are hard to duplicate consistently. thanks again everyone

 

Keep the ideas coming each and everyone is helpful . I will check each of the ideas once I go pick it up from the shop in the next few days.

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Any other ideas?

 

Because of all the catcus in az I put slime in my tires, at around 40 mine starts shaking.

 

my steeringwheel shakes i think it needs realigned

 

Ye I have experienced this type of shake but what I am talking about is more like all the lug nuts simultaneously come out thus all the tires are soon to no longer be attached to the machine....serious shaking....

 

I would take a look at the drive shaft from the transfer-case to the front diff. There is a carrier bearing that could very well be bad. If the driveshaft is out of balance then you would get a vibration like that too. Most likely its that carrier bearing gone bad.

 

Still sounds like the Clutch belt to me

 

I am going to read up on BlackBarts post on the belt replacement and such today and see if I discover anything.

 

Put the rear of the machine on jack stands and run it to see if you can get a similar vibration.

 

When I blow a wheel bearing it shakes pretty bad. Try putting it up on jackstands and see if anything in the front or rear end moves at all.

 

I am beginning to think that I need to jack it up as you suggest. I tried moving it while on the ground but I am now thinking the weight of the machine might have made it hard to move will on all fours.

 

if it only shakes in 2wd and not in awd then it may very well be a u joint on the drive shafts. In awd it puts pressure on all ujoints so shaking will stop or the shaking may calm down. Im not at home right now to see if there are or where there are ujoints,but this is my experience when shaking has occurred on my atv.

 

I should have tried this but as I thought about it I thought since the drive shaft was not engaged unless in awd then it would not be moving thus no shaking. I will also give this a try.

 

I would definitely check the belt first - had one go in my RZR. Will definitely shake and thump. I had a wheel bearing go in my Sportsman 800 and of course it shook - but It was obvious I blew a wheel bearing when up on the stand checking the wheels for play. If it was shaking that hard and was a wheel bearing you should have saw some play when you jacked it up. If its not the belt check your fluids. My local dealer has sold a few with no trans fluid or rear differential fluid. So much for their $200 prep charge. My Sportsman 800 came from the dealer blowing smoke with an extra quart of oil from the factory. I checked all my RZR fluids as soon as it came off the trailer.....

 

Good call on the carrier bearing Familyman...I've replaced 2 of those and the concern was "shaking." Keep us posted, I wonder who will be right in this "Think Tank."

 

My vote goes to the carrier bearing. A buddy had a 4 and went through 2 or 3 of them. It shook when it went bad.

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My rzr-s started shaking around 10 mph and go away at 15 after i put a set of paddles on it. I haven't put the stock bighorns back on to check to see if it was only the paddles that did it. It felt like the whole machine was coming apart.

 

i had the same thing happen on the same model. it was the carrier bearing and the dealership i deal with in houston had to order the part, luckily i was able to over night the part the week prior to mud nationals.

 

well whatever it ends up being hopefully you'll get it figured out soon so you can get back to riding without worries.

 

Well took it back yesterday. Belt looks good. Now on to the other suggestions. More ideas?

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Back from the dealer that is

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BTW. Did the same thing in awd. No sought its happening more now.

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I to have A 2011 rzr 4 and had the same exact problem as you described. It was the carrier bearing. I replaced it with a greasable pillow block bearing and that took all the shaking out. My rzr only had 180 miles and the stock Polaris bearing was completley froze up and the rubber around the bearing was chewed up. Basically the bearing was flopping around in the metal housing. I think the new parts from Polaris were going to be like 50 dollars. And I paid 12 dollars for the new pillow block style housing and bearing that is about 5 times as heavy duty and it's greasable. I would pull your center console and check the bearing.I am going to put some pics up later of the new pillow style bearing installed.

 

Bent axle, belt slipping, one cylinder misfiring, bad sparkplug, coil or wiring. Motor mont crack, rear diff. mount crack (check to see if the rear diff. is rubbing against the frame just under it).

 

Okay, it's time for my two cents. Since you said it's intermittent, I betcha its carrier bearing. Check out this link for symptoms and even a video. Does that fit yours?

http://www.redneckridgeriders.com/forum/viewtopic.php?f=14&t=1556&view=previous