2008 M8 diamond drive gear question

Hey guys, I was just doing my preseason DD removal/open up and oil change when the I found the bearing on the end of the splined transfer gear in pieces. It didn't even stay pressed on the shaft. This has happened once before. I use SKF 6203-2RSJ bearing.

So my question and concern is this bearing was only in the sled approx 320 miles. Not that long and it's destroyed. I also notice that it seems like the bearing is spinning on the shaft and then the washer that's next to it, heats up and penetrates the seal on the bearing and the rest is scrap metal.

Am I using the wrong bearing and this is causing the spinning on the shaft or is the shaft a little smaller now from all the spinning (worn down) and there is not enough of a pressed fit. I can easily press on pretty much by hand and every year when I change it, I can pull it off by hand if its even attached to the shaft. This particular failed bearing is not one bit snug on the shaft. This is the second bearing failure I have had. First was the original cat bearing to my knowledge. It also was totally wrecked and off the shaft.

Also, there is now some marks on the shaft of this transfer gear. Even up close looks like the weld is cracked. If anyone has a transfer gear near by or know what they look like can you see if mine looks normal.

I am leaning toward buying a new transfer gear and hope for the best. What do you guys think



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TheOnlyBFC said:

Do you have a picture of the bearing that you are talking about? If it's the one I'm thinking of I believe I put a sks in there without the seals. USE some loctite retaining compound to the shaft and bearing to help "glue" the two together and hopefully stop the bearing from spinning on the shaft. It's hard to tell in the pictures on my phone, but if you are concerned about the welds you could have them re-welded at a machine shop, even have them go all the way around to add xtra strength. I have spun 2 sets of those gears on the shafts. Sub par stuff in my opinion.

Click to expand...

Thx for the reply. The welds. That's what I was wondering. Is that normal to be welded only in 2 places? I am a little concerned about it all the same.


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DAKOTAKIDD said:

Thx for the reply. The welds. That's what I was wondering. Is that normal to be welded only in 2 places? I am a little concerned about it all the same.


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Click to expand...

Here are some pics of the bearing and shaft



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Thx for your reply. I did some real close looking at it today and found what looks like 3 hair line cracks in the welding. I don't feel comfortable reusing it again

Then I talked to BDX today and he was a wealth of knowledge. He suggested a couple ways to reuse the gear but also suggested replacement after I told him there are cracks in the welds.

I bought it and he is going to machine it down to take the double row 5203 bearing. Hopefully this will be the last of this problem

Cheers,