Vibration at low speed and loud track droaning?

unchained

unchained

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Joined
Sep 16, 2003
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285
Age
47
Location
Fenton, Mi.
All of a sudden my sled has a low speed vibration in the footwells and my track droaning noise has doubled. Any clues on a sled with 4500 miles? Lower drive bearings, jackshaft bearings? The skid was just completely rebuilt and is tight and I had the chaincase cover off, inspected and fresh oil 400 miles ago. With the weather it looks like I'll have plenty of time but supposedly the sled had all drive bearings replaced at 3500 miles from the original owner. BTW, the vibration goes away after 40 but the track noise doesnt...
 
OK so I finally dug into it and yes the jackshaft bearing collar torx head screws were not locked down onto the jackshaft. The bearing appears to be securely trapped in there with the plate that draws it against the chassis. Although the screws were not tight, I don't see any evidence that the bearing has been spinning in the plates that sandwich it in there. I'm hoping this is it cuz I really don't want to remove the lower driveshaft but I guess I'm skeptical the vibration in my left foot was from what I just found...
 
Well I put a dab of blue loctite on each and locked them down and took it for a spin and I do think the vibration is gone...
 
That was most likely you're problem. If you think the bearing is the original I would probably change it anyway. You don't have to remove your driveshaft or rear suspension to change it. Loosen you're track off, remove the set screws that hold the bearing on the shaft. Then remove the 3 bolts that hold your bearing/spedo assembly in. The bearing might be a little tough to get off the shaft but it will come off through the tunnel. It is easier with a helper so you can tip the sled on its side rather then sitting flat so the driveshaft isn't fighting you. Just be careful you don't damage your hood.
 
SRXSRULE2 said:
That was most likely you're problem. If you think the bearing is the original I would probably change it anyway. You don't have to remove your driveshaft or rear suspension to change it. Loosen you're track off, remove the set screws that hold the bearing on the shaft. Then remove the 3 bolts that hold your bearing/spedo assembly in. The bearing might be a little tough to get off the shaft but it will come off through the tunnel. It is easier with a helper so you can tip the sled on its side rather then sitting flat so the driveshaft isn't fighting you. Just be careful you don't damage your hood.
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Cool thanks. I think I am going to go ahead and replace that left side lower drive shaft bearing like you said. You don't have any tips on replacing the left side Jack shaft bearing without tearing the chaincase apart do you?
 
Replace It I Bet Its Been Run Dry.and The Jack Shaft Bearing If The Set Screws Were Loose I Would Pull The Bearing And Make Sure I Did Not Wear Into The Shaft Like Mine Did Lol.
 
unchained said:
Cool thanks. I think I am going to go ahead and replace that left side lower drive shaft bearing like you said. You don't have any tips on replacing the left side Jack shaft bearing without tearing the chaincase apart do you?
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I'd have to check the manual as I can't remember without looking at it (sled is not home yet) But I'm pretty sure you can just pull the secondary off and get to it? I'll check my manual.
 
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