I read about changing hub fluid with mobile 1 but no results, then I took hub apart and cleaned and inspected all the parts, they all seem in good working condition. I noticed a small amout of scoring on the spindle shaft in about the area the amature plate rides, and one tab on the plate was very slightly bent, but it did not look serious enough to affect anything. I put it back togather and it does the same thing, 1 ft wheel engages at high rpm rear wheel spins(snow). So do you think that the hillard and plate could be bad?, or maybe the shaft spindle?, or both. But now the front prop shaft is twisted, from the tire engaging at high rpms I believe. I have a new prop shaft and u-joints, a cvt shaft that is almost new(dealer replaced in insurance work,shaft looks in good shape I think they need extra dough since ins. was paying bill). I considered putting these parts on but hate to bend another prop and damage shaft. The hillard assembly seemed in good shape when I inspected it, the spring was undamaged and rollers functioned well. Should I order a new hillard and plate or install the cvt and prop(maybe scoring on shaft fault). Has anyone ever had to repace there hillard assembly because of simular reasons. Any info would help, as you can imagine these parts are not cheap.

 

I have limited experience with this, but I could give you a guess. My guess would be one of two things. Either the magnet is too 'tight' and dragging on the mechanism (this gets worse as temps fall) or else the spring on the hilliard clutch (the one around the rollers) is weak. If the spring is weak, that can cause hub sticking at high speeds. As wheel spins faster & faster, there is more & more force against the spring as the rollers in the hilliard (spelling is not my strong point) If the spring is weak or stretched, it may allow one or more rollers to move outward far enough to 'grab', locking the hub. This is especially true if it was ever taken apart, as it is very easy to stretch the spring, sometimes without even being aware of it.
If you can do the work yourself, i would check the magnet first, as it is the 'free' fix. I doubt the spring is too high, though.
If I am wrong, remember this is just a 'best guess', I don't want any guys named Mugsy lookig for me LOL

 

I thought the same about the spring, because it only does it at high rpms, she does have alot of hard miles on her. Guess I will have to call the dealer and see about springs. Do you need special tools to replace one?

 

No special tools needed, but be very careful not to stretch the new spring any more than you absolutely have to to get it installed.

 

Thanks for the help, I will order me spring and see if that is the problem(trying to avoid taking to dealer)

 

Let us know how it turns out, sweetcorn. I've seen them do the same thing periodically, and always wondered what made it do that.

 

The same thing was happening to my friends 400 Scram. It would go in and out of 4x4 when you were at high speeds. It was a little scary, because it would jump to one side and make control an issue. He took it back to the dealer, and they replaced the whole hub unit.

 

Sweetcorn, have you tried unplugging the electric going to the bad hub? Then do your high-speed test.
Another thing to try is blocking all four corners up and put the wheeler in 2high, slightly rev the engine(rear wheels spinning) and see if the bad front hub\tire is wobbling while NOT rolling. My '99 SP was engaging in snow too. I had a bent outer shaft. Ride'em hard Polcat

 

it must be a common problem i have a 99 scram 500 its been fine until it got cold and snowy. now its doing the same thing. im afraid im going to break something so ive been riding around in 4-wheel drive.

 

I finnally got me a new spring and installed it and it still does the same thing. So now I was thinking that if I swapped the hillard assemblys and see if the other tire does it or not. I don't know much about the magnets, what do you mean by to tight?. I don't think it is an electical problem because it does it in 2wd and only 1 tire, But I'll check it out.
thanks for the help, I'll keep ya informed