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jackshaft broke in half

A

aksnopro

Well-known member
wow!!! first i have read or heard about this, but my buddy on his 2012 M8 sno pro broke his jack shaft in half last weekend. he thought it was the chain case but on inspection the gears and chain were there and fine.


he has zero mods to the sled except skis.

it broke right behind the chain case clean in two.

it was an awesomely deep day! he bought a 2011 m8 for his wife so he didnt miss out on any riding the next day hahaha.

-Aksnopro
 
That is a strange one, for sure. Possibly just a flaw in the stock that was used to make that one shaft. I'm interested to hear the conclusion on this. Very rare, no matter the brand.
 
Would like to see some reasonably close up pictures of the broken ends if you could. I'm wondering if it isn't a fatigue fracture.......

Did he have issues with the nut in the chaincase previously or anything else of note like the chatter?
 
Right around 400 miles never tightened the nut and was on belt 3. I never seen it we thought it was in the chain case so we didn't even look at the jshaft. Dealer called him and told him!

-Aksnopro
 
FrostBite2010 said:
If only there was some way to get rid of that silly jack shaft and put some planetary gears in a gearbox that could drive the track without jack shaft or a chaincase....it would revolutionize the snowmobile industry!!! :face-icon-small-hap
Click to expand...
Oh boy... here we go. LOL.

And everyone thought getting ride of the DD was the best thing since sliced bread. Too bad the breads gone stale EH.
 
F_ast said:
Oh boy... here we go. LOL.

And everyone thought getting ride of the DD was the best thing since sliced bread. Too bad the breads gone stale EH.
Click to expand...

I have had very good luck with the diamond drives themselves although I can't say the same for the horrible secondary clutches that go along with them.

I was excited about going back to a chain case so we had more options in the clutching department. Whatever happened to the floating secondary anyways! There are far more clutching issues with these newer sleds than with the old ones! Why mess with something thats already tried and true? Torque link control??? Just give us some good motor mounts, team tied clutches, and proper alignment and I would be happy!!!
 
Any time you try to ( float ) a shaft like that with as much speed as they turn the problems are as follows,, obvious bearing failure I don't care what any body says.. Next cracking in the areas of bearing mounts.. Third self destruction of any related parts... I know all about this type of bearing and IMO they don't work. When you plan to have a shaft move as the jack shaft does the bearing of choice is a double row tapered roller bearing.. They are tough as they get and can take some movement but,, with this floating shaft idea in this situation bearing failure is unavoidable.... Man,, I wonder what kind of degree you have to have to be an arctic cat engineer. This type of failure is embarrassing.. Took me about 6 months of trial and error to figure out that this style of bearing didn't work on a shaft type brush cutter and I didn't go to college.. Gotta love these new age colleges........
 
hahahhahaha


oh man thats funny right there...

it took me a little while to like the diamond drive (08 m8 bought in 07 had 2 updates) i blew up 3 of them.


but with that i figured it out, and on my 10 i replaced the bearings at 150 miles with a quality bearings and some good lube, now i have almost 2k trouble free miles! :)

i think i read somewhere someones trying to put a DD in a proclimb?

-Aksnopro
 
KMMAC said:
Any time you try to ( float ) a shaft like that with as much speed as they turn the problems are as follows,, obvious bearing failure I don't care what any body says.. Next cracking in the areas of bearing mounts.. Third self destruction of any related parts... I know all about this type of bearing and IMO they don't work. When you plan to have a shaft move as the jack shaft does the bearing of choice is a double row tapered roller bearing.. They are tough as they get and can take some movement but,, with this floating shaft idea in this situation bearing failure is unavoidable.... Man,, I wonder what kind of degree you have to have to be an arctic cat engineer. This type of failure is embarrassing.. Took me about 6 months of trial and error to figure out that this style of bearing didn't work on a shaft type brush cutter and I didn't go to college.. Gotta love these new age colleges........
Click to expand...

The secondary clutches have been floated for years and they work just fine. Same bearings that are in the non floated setup they have right now. Even if the floating secondary causes premature wear on bearings its not a big deal. You can replace every bearing seasonally for the cost of one of these belts. All I am trying to say is stop trying to re-invent the wheel.
 
Sometimes stuff just has defects there's nothing you can do to stop it from happening unless you spend a a$$ load of money. Which would make are sleds $25,000 plus. Sucks yours was the one with the defect but it is what it is. Get it fixed and go ride the chit out of it!!! :)
 
wanna trade? haha j/k, yeah. i been dealing with it, was pretty content with it till this last dealer expierence. but im back to normal now that i vented.. :) haha


i gotta know whats fixing it before i invest in the fix. i want to buy a team tied but if i buy one and it still blows belts i wont be able to efford anymore fixes!
 
float

FrostBite2010 said:
The secondary clutches have been floated for years and they work just fine. Same bearings that are in the non floated setup they have right now. Even if the floating secondary causes premature wear on bearings its not a big deal. You can replace every bearing seasonally for the cost of one of these belts. All I am trying to say is stop trying to re-invent the wheel.
Click to expand...


I didn't say anything about secondary clutch float I was referring to the floating jack shaft which the thread post is about..
 
KMMAC said:
Any time you try to ( float ) a shaft like that with as much speed as they turn the problems are as follows,, obvious bearing failure I don't care what any body says.. Next cracking in the areas of bearing mounts.. Third self destruction of any related parts... I know all about this type of bearing and IMO they don't work. When you plan to have a shaft move as the jack shaft does the bearing of choice is a double row tapered roller bearing.. They are tough as they get and can take some movement but,, with this floating shaft idea in this situation bearing failure is unavoidable.... Man,, I wonder what kind of degree you have to have to be an arctic cat engineer. This type of failure is embarrassing.. Took me about 6 months of trial and error to figure out that this style of bearing didn't work on a shaft type brush cutter and I didn't go to college.. Gotta love these new age colleges........
Click to expand...

Six months of trial and error with a weed whacker?! I'd say you're ready to graduate!:face-icon-small-ton
 
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