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Discussion Starter · #1 ·
With my recent experience of toasting the spindle bearing at the speedo adapter I got to wondering . . . .

• Why did this one go after only 1500 miles from brand new? Was my track tension too tight?

• Since these are sealed bearings should they just be changed out at a certain number of miles or seasons?

• The bearing on the gearbox side seemed fine, should I have changed it while everything was apart?

• What about the bearings on the drive & driven shafts? Do I just wait for them to go or be proactive?

I only got into this sport 3 years ago and have learned a lot. But I hate surprises. :wacko:
 

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That bearing should be considered a maintenance item, just like Hyfax or carbides, but 1500 miles is low. It could have been a defective bearing, but have you been lubing it? There is grease zerk on the speedo housing, and adding a little grease on a regular basis there will greatly increase the life of your bearing on that side, even though it is a sealed bearing. Don't overdo it. When replacing that bearing, I always replace the gearbox side as well, even though I have never had a bearing failure on that side. I do not replace the jackshaft bearings on a schedule, but I do inspect them regularly. There should be no lateral movement.
 

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Discussion Starter · #3 ·
It could have been a defective bearing, but have you been lubing it? There is grease zerk on the speedo housing, and adding a little grease on a regular basis there will greatly increase the life of your bearing on that side, even though it is a sealed bearing.
When I pulled the housing there was just a hole where the zerk would have been.
I have since installed one. There was a fair amount of grease in the
housing, I thought it was just for the speedo mechanism.

But if it is a sealed bearing then how does that grease pumped into
the housing make it into the bearing? :huh:
 

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The speedo side should be sealed on the inside and open on the other to allow the grease to reach the bearing internals. If the sleds showed 1500 miles, had a bad bearing and also no zert, it sounds like maybe the sled had more than 1500 miles...
 

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Discussion Starter · #6 ·
The speedo side should be sealed on the inside and open on the other to allow the grease to reach the bearing internals. If the sleds showed 1500 miles, had a bad bearing and also no zert, it sounds like maybe the sled had more than 1500 miles...
No, I bought the sled from the original owner when it had just 250 miles on it.
 

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To me, they look like a Protected bearing. They have a metal protector. Not plastic a plastic "seal" like an alleged sealed bearing.

IMO, there is no such thing as a sealed bearing in reality. All "sealed bearings", like for the idler wheels, have little to no grease. Those I peal open and pack with grease.

The Protected Drive Shaft bearing needs to be greased & purged a couple times, depending upon mileage & conditions, per season. Then Really greased & purged when putting into storage.

The grease pushes through and makes a mess, under the tunnel, around the drive shaft. Just wipe off the excess and you're good to go.

I just did this, last night, in preparation for a 200+ mile ride on Saturday. I Do, however, like to change bearings at the 3000 mile mark, as previously mentioned.
 

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Have they ever been changed? How old is the sled? Depending on storage I would change them between 6-10 years regardless of mileage.

I change mine at 5000 miles, I usually do all 4 but when I did my 02 T-Cat a while ago I only did the clutch side driveshaft and jackshaft and sure enough I blew the bottom bearing in the chaincase for my first time ever. It has reverse though and I guess it is spinning more weight.

01 and up jackshaft sleds have a relubricative bearing on the jackshaft that works very well. It claims to have a relube bearing on the driveshaft also but does not work and the part number has been changed up.
 
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