Chaincase gear wear

[FernieHawk]

This is the wear on my 3500 km 2017 M8000 lower chain case gear. Any opinions on if this is normal and what the replacement schedule should be? My understanding is this is an aluminum gear.

I bought the sled just over a year ago and this is my first look at it. I haven't had a sled with a chain-case since 2008 and I've gone through 4 earlier M series chassis that had the Diamond drive gear cases...I always used the BDX gear and bearing upgrades.

 

[Jorg Jorgenson]

View attachment 231418

This is the wear on my 3500 km 2017 M8000 lower chain case gear. Any opinions on if this is normal and what the replacement schedule should be? My understanding is this is an aluminum gear.

I bought the sled just over a year ago and this is my first look at it. I haven't had a sled with a chain-case since 2008 and I've gone through 4 earlier M series chassis that had the Diamond drive gear cases...I always used the BDX gear and bearing upgrades.

This is what my gear looks like after only 800ish miles, and you are correct it’s an aluminum gear from factory. Many upgrade to steel so it doesn’t wear down. 3500km seems like a lot, of you’re opened up might not be a bad time to replace components as preventative maintenance

my tensioner was in a different position to accommodate for the worn down gear. I guess if you still got room to take up the slack, you could keep running it? Not recommended perhaps?

 

[catrutt]

What year did cat stop using steel gears?

 

[papajake]

Do you have to take the cover off to adjust the chain tension seems like a lot of wasted oil if that’s the case

 

[rsmorin1]

Do you have to take the cover off to adjust the chain tension seems like a lot of wasted oil if that’s the case

It's an auto tensioner.

I'm going to replace my gears and chain soon with the HYVO set - I'm about 2200KMs on mine. I changed the oil at about 1000 kms. I did a nice clean, wiped out as much aluminum & brake clean to get it as clean as possible. Put new oil in, ran it on the sled stand for a minute and looked like an aluminum milkshake in the sight glass. I will replace after this season - just need to confirm gearing.

https://venomproducts.com/index.php/parts-catalog/2-stroke-procross--proclimb-kits

 

[mountianguy]

Do you have to take the cover off to adjust the chain tension seems like a lot of wasted oil if that’s the case

If your worried about 12 ounces of oil lay the sled on its side.

 

[Clode]

replace everything, that's a crazy amount of aluminum contamination, bottom gear is toast

 

[1200]

Just junk who the smart guy thought it was a good idea to put alum gear in chain case

 

[Lund]

We have been installing Yamaha gears and chains in all our Cats. The OP has nothing usable, gears, chain and bearing and seals, all pooched. Upper gear might be usable if your on stock power.

 

[FernieHawk]

Well this certainly did not look good to me when I opened it up, but I wasn't sure what was the norm for an aluminum geared chain-case. Is aluminum considered a lubricant...LOL.

 

[Lund]

Here is the Yamaha part # for the lower gear, with that you will be able to match the chain and top gear if you wish. Or if your dealer isn't smart enough let me know and i'll post the other #'s

50T Lower gear #8JP-G7587-00-00.

 

[popeye]

What year did cat stop using steel gears?

Not sure but my 2013 has a steel one. just opened it up today after seeing the picture of the damaged aluminum one. My steel one is still good with 1950 miles on it.

 

[378Cat]

[FONT=&quot]3602-024 is the Cat part number for the 50 tooth light weight steel gear used in the newer High Country and some of the international Alphas. Put one in my 21 Alpha before it hit the snow. Can’t stand seeing the aluminum in the oil with in the first ride. [/FONT]

 

[dragonweld28]

I have lots of these in stock.