Originally Posted By: Vikas
I looked at the owner's manual. It has friction disk. I see no chain in the picture. The thing is when the wheels stop spinning, they lock up i.e. I can't manually move the snow thrower either. So it is not slipping at that time. Can something get frozen there?
It sounds like something is getting stuck internally. Either the chain is catching on something or a linkage is seizing up. I've never seen drive parts freeze on a snow blower while its operating. I've seen them slip from water getting in, but never just randomly freeze during use.
I'd pop the bottom cover off and have a look. You might see something obviously wrong. I popped the cover off my Toro 826 and found the drive was full of mouse nests. The nest material was bound up so tightly in the gears I'm surprised everything still moved.
If everything looks ok, pop off the drive belt and spin the pulley by hand (with the engine off) with the drive engaged. You will start to feel it bind up and see what is causing it.