2000 ZRT, runs great but betweeen 23 and 30 mph (most prominetn at 25 mps) there is a loud groan and a vibration. It goes away any slower or faster. I rode it a few hundred milkes this weekend and noticed no chnage, so I do really know what to looke at. The jack shafy and drive shaft bearing s are brand new. ANy suggestions as to what to check? Thanks.

has the track loosened or out of alinement

Originally posted by newfiebyblood@Jan 17 2005, 08:04 PM
has the track loosened or out of alinement
390319


I will check it because I had it off while I changed the bearings. Would that casue these symptoms?

Yes a miss aligned track would cause those symptoms.

Originally posted by BrokeButLovinIt@Jan 17 2005, 10:43 PM
Yes a miss aligned track would cause those symptoms.
390404


To check it I raise the track in the air and then spin it, then measure the distance from the edge to each rear idler wheel correct? Then just adjust teh screws out to make the distances the same correct? WHat is the general way to check track tension, without a faish scale? Thanks

Originally posted by fast426@Jan 17 2005, 06:24 PM
2000 ZRT, runs great but betweeen 23 and 30 mph (most prominetn at 25 mps) there is a loud groan and a vibration.* It goes away any slower or faster.* I rode it a few hundred milkes this weekend and noticed no chnage, so I do really know what to looke at.* The jack shafy and drive shaft bearing s are brand new.* ANy suggestions as to what to check?* Thanks.
390280


Had an 01 ZRT 600 with that problem. In my case, it turned out to be the crankshaft that slipped out of phase. If this is the case, you will probably notice that your primary clutch is vibrating at idle. if the clutch is not running true, you'll need to remove it and measure the crankshaft run-off with a dial indicator. Anything over .002" is considered out of spec.

Hope it's not the case for you cause it's a big job.

Green

Originally posted by green@Jan 18 2005, 11:06 AM
Had an 01 ZRT 600 with that problem. In my case, it turned out to be the crankshaft that slipped out of phase. If this is the case, you will probably notice that your primary clutch is vibrating at idle. if the clutch is not running true, you'll need to remove it and measure the crankshaft run-off with a dial indicator. Anything over .002" is considered out of spec.*

Hope it's not the case for you cause it's a big job.

Green
390586


WOw I don;t think that is the issue, it is fine at idel and over, it is a rolling thing. I think drive train for sure.

not necessarily--engines act much differently on a stand vs. loaded running down the road

Wouldn;t that be a problem that would progressivly get worse, if the clutch was wobbling? Plus on a stand you should still see that wouldn;t you?

Originally posted by performancex@Jan 18 2005, 10:26 PM
not necessarily--engines act much differently on a stand vs. loaded running down the road
390869

Originally posted by fast426@Jan 19 2005, 10:51 AM
Wouldn;t that be a problem that would progressivly get worse, if the clutch was wobbling?* Plus on a stand you should still see that wouldn;t you?
391002


If your sled is on a stand and the sled is idling 1200rpm or so, you should see the clutch wobble. if you give it some gas, you won't see the wobble anymore because the clutch is spinning to fast for your eyes to see the wobble.

If your clutch is not wobbling at idle then it's probably not the problem.

Originally posted by green@Jan 19 2005, 11:27 AM
If your sled is on a stand and the sled is idling 1200rpm or so, you should see the clutch wobble. if you give it some gas, you won't see the wobble anymore because the clutch is spinning to fast for your eyes to see the wobble.

If your clutch is not wobbling at idle then it's probably not the problem.
391025


It looks like the clutch is not even spinning at idle. I hate to be so optomistic, but track alignment sounds more feasible since I just had it off. I will chekc it out. Thanks

Originally posted by fast426@Jan 19 2005, 12:32 PM
It looks like the clutch is not even spinning at idle.* I hate to be so optomistic, but track alignment sounds more feasible since I just had it off.* I will chekc it out.* Thanks
391051


Well I jacked up the rear and spun the track, then measured from each side to each outer wheel. Did I do it right? It is almost identical on each side.

Yep. You did it right. You can also measure the gap between your slide/hyfax, and a track clip guide. (the side of the guide, not the bottom) Either way. As long as they are close. Just remember not to hit the brake. Let it coast to a stop.

Maybe, if it's not that bad of a groan, it's just the natural frequency of the drivetrain. Everything has a natural frequency. Yours may be getting a tad bit of a vibration from natural frequency at 25 mph. Just a thought.
Oh, to check track tension with out a scale or anything. I can usually tell if mine is fine by seeing if there is a 1/2 to 3/4 in. of sag in the track when on the stand. Then sometimes I will just push in the middle with what I think is roughly 20 pounds by hand. But that's me and for my sled.

Did you secure the locking collar on the LH driveshaft bearing properly? Does greasing it make a difference? Have you inspected the drive belt? Have you rotated the track and inspected it for damage? How about a damaged wheel or bad bearing?
If your riding in low snow / hard pack your track is prone to sounding a little on the loud side as compared to better conditions.

Good luck
Rick

Originally posted by ZR Sled Head@Jan 27 2005, 04:42 PM
Did you secure the locking collar on the LH driveshaft bearing properly? Does greasing it make a difference? Have you inspected the drive belt? Have you rotated the track and inspected it for damage? How about a damaged wheel or bad bearing?
If your riding in low snow / hard pack your track is prone to sounding a little on the loud side as compared to better conditions.

Good luck
Rick
394904


As far as the locking collar, I got it in place, put in the skid, then locked it. I then adjusted the rear, should I have locked the collar totally last? As far as everything else it is all fine, I just had it all apart and checked it all out. The bearings have always had grease, and I did regrease after teh seocnd time. It is only at around 25 mph, I am wondering if it isn;t just a natural vibration?

Sure sounds like it........does it go away in deeper snow?

Originally posted by ZR Sled Head@Jan 27 2005, 06:34 PM
Sure sounds like it........does it go away in deeper snow?
394955



Well I stand corrected, I looked at the collar and it was not tight agaisnt the bearing. The bearings still seems to spin fine, so I am just going to lock it again (iit has some dirt and ice in there, so I have to work it). It does get better in deeper snow. Do you think I could have done damage by not have the collar locked in place? I onely went about 200 miles.