99 xc sp 700-lots of vibration in the footwells

[indy_500]

a dealer told us the clutch wasn't aligned right and it could be hurting the motor. we didn't get it fixed because the clutches looked fine and everything. but when you go over 60 mph, it vibrates a ton, it feels like it's coming from the chaincase, possibly it's too tight? or a bearing is bad? or the clutch is bad and could be hurting the crank? anyone have these problems? i have 3 sleds and now i don't wanna ride 1, and the other 2 are broke. i just sheared the bolt on my 500 in the suspension.

 

[uncle_ed]

I wouldnt think that clutch misalignemnt would cause a vibration but would rather eat belts. I would look more in the drive line and do a visual to the entire track for missing chunks, a bad bearing or gears and chain. After a visual inspect put it on a safe stand and run it and listen and see if you can hear/feel where the noise is coming from. Make sure you have someone assist you in this so you can better diagnos the problem safely. Look for clutches that wobble or something that doesnt look right in the track area. Is this the one that lost the coolant? If so then you may find the problem when you tear it down to weld or replace the exchanger. Also dont be afraid of welding the exchanger as I have had that done before with great success and much less work/expense.

 

[indy_500]

I wouldnt think that clutch misalignemnt would cause a vibration but would rather eat belts. I would look more in the drive line and do a visual to the entire track for missing chunks, a bad bearing or gears and chain. After a visual inspect put it on a safe stand and run it and listen and see if you can hear/feel where the noise is coming from. Make sure you have someone assist you in this so you can better diagnos the problem safely. Look for clutches that wobble or something that doesnt look right in the track area. Is this the one that lost the coolant? If so then you may find the problem when you tear it down to weld or replace the exchanger. Also dont be afraid of welding the exchanger as I have had that done before with great success and much less work/expense.

no this one is different

 

[dab102999]

I would think that vibration would be from track bearings and not clutch. If it is the clutch it will take the crank out though. If not now eventually. But as stated clutch problems will usually show up on the belt first. Have you looked at those motor mounts real good, put a pry bar in there and be carefull but see if u can move the motor. Relieve some tension on the track and see if you can move the shaft at all. How does the oil look in the chain case?? Did you check the tension on the chain??

 

[jimfsr]

Vibration at speed, could be a few studs are gone or chunks of track, it can cause the track to be out of balance, kind of like a tire on the truck, hits a harmonic at certain rpm's, and sets up a vibration. Also check the drive wheels in the front, the Polaris ones seem to have trouble with the teeth on the drive wheels wearing out or breaking off. I have seen it before. That would cause a vibration/ out of balance condition.

 

[indy_500]

Vibration at speed, could be a few studs are gone or chunks of track, it can cause the track to be out of balance, kind of like a tire on the truck, hits a harmonic at certain rpm's, and sets up a vibration. Also check the drive wheels in the front, the Polaris ones seem to have trouble with the teeth on the drive wheels wearing out or breaking off. I have seen it before. That would cause a vibration/ out of balance condition.

this is what i was leaning towards now, i've put on 500 miles on it like this and the person before me never touched the clutches since he got the sled so i don't think it's the clutch because the crank would've gone by now

 

[indy_500]

oh yea, i noticed one stud was like sheared, the backer, nut and part of the stud is there but the tip of the stud snapped off or something.

 

[skidude67]

Check you jackshaft bearing. Most Ski Doo's have a zerk fitting (hard to see) to grease this bearing....not sure about the Polaris'. Problem is most of the time when the bearing runs without grease it gets destroyed. Primary Clutch could be out of balance as well...either something mechanical or dirty. You might try blowing it out with compressed air or taking the belt off and dousing it with a can of clutch cleaner.

 

[indy_500]

Check you jackshaft bearing. Most Ski Doo's have a zerk fitting (hard to see) to grease this bearing....not sure about the Polaris'. Problem is most of the time when the bearing runs without grease it gets destroyed. Primary Clutch could be out of balance as well...either something mechanical or dirty. You might try blowing it out with compressed air or taking the belt off and dousing it with a can of clutch cleaner.

ok so i've narrowed it down to a couple possiblities. a bad belt, track drive lugs on the inside could be missing, bad driveshaft, jackshaft, or chaincase side bearings could be bad and posibly the clutch could be mis-aligned which i highly doubt because i'm pretty sure the crank would be seized by now

 

[polarisrider1]

Add to your list that your track alignment may be off and as you go faster your track starts running to one side and your drivers are hitting the drive lugs at an angle instead of ridng squarely. Are your hyfax to long? That usually makes a clicking sound more so than vibration. Hard to trouble shoot from my recliner.

 

[indy_500]

dealer said they checked track alignment, not too worried about getting it fixed until we get my 500 fixed and my 700 welded. tomorrow the plates for the tunnel mounting holes should be coming in and we'll try to get the bolt out of the shaft. should be easy but you never know. in 2 weeks we're gonna get the heat exchanger welded but we're still not 100% sure that that's the problem since we haven't taken it apart yet

 

[ubee]

Try something simple,try changing the belt!

 

[indy_500]

Try something simple,try changing the belt!

yes i thought of that too

i haven't been able to do much with it (the xc sp 700 is my dads sled) and my 700 had a stud poke a hole in the heat exchanger and my 500, a bolt sheared in the suspension. and, my dad's been working 2nd shift so i dont' talk to him and i've been loaded with schoolwork since nextweek is finals. this weekend when it's warm and the trails r closed we're fixing my 500 and going to try to fix my dad's 700. my 700 will be fixed not this weekend but the next since we dont' have a welder

 

[tomxc700]

check the track tension, it might be loose and be ratcheting.

 

[indy_500]

another thing to mention is the whining from the chaincase doesn't happen until you apply the brake. whereas my xc 700 (not the xc sp) whines a ton whenever u let off the the gas

 

[getsome]

Vibration

indy--- fellow Ditchbanger that you are.

I have actually gotten a small black rock stuck between the drive cogs on the inside of track. But it made the vibration all speeds. I would place my vote on a bad shaft bearing...good luck. get them sleds fixed !

 

[indy_500]

this sled hasn't been ditchbanged like my 500

i'm kind of leaning back towards either a track problem more or less on the right side or a chaincase problem or a chaincase bearing since most of the vibration is coming from that side. if it was a bad bearing though, wouldn't it have kicked out the speedo by now?

 

[indy_500]

indy--- fellow Ditchbanger that you are.

I have actually gotten a small black rock stuck between the drive cogs on the inside of track. But it made the vibration all speeds. I would place my vote on a bad shaft bearing...good luck. get them sleds fixed !

i do have some vibration at idle and up to 60 but when it hits 60 it really starts to vibrate. and o yeah, kens sports called, they have the parts in for my 500. i'll get her fixed tomorrow morning and when i'm done, i'll go get to ride it on the trail! NOT! lol

 

[hemi_newman]

the speedo gets it reading from the drive shaft not the bearing. As long as the drive shaft is moving your speedo will work at least on a skidoo,im sure polairs is the same.

 

[indy_500]

well if the bearing would be shot, it would make the driveshaft wiggle and snap the speedo key connecting the driveshaft to the speedo cable so that's why i asked