I've been using my 416S for almost nothing but snow plowing lately, I'm running a set of filled 23-10.50x12 BKT AG tires with an additional 50lbs of wheel weight on each rear wheel.
About two years ago I replaced both belts, both belts were ordered online, from an OEM supplier.
I was pushing snow last week and started to loose forward motion.
The snow was drifted up over my head in one place, but it was wet and packed. I figured I'd make a cut through the middle and start working it off to each side of the drive. As I started pushing, the whole pile started to just slide on the loose pack underneath. By the time I hit the end of the driveway I had what looked like an iceberg ahead of the plow. By that time it was starting to really struggle, both rear tires were pawing at the asphalt below and I had the throttle bumped all the way up. At the very end of the drive I broke through the middle of the pile and shoved it down into the ditch on the other side of the road. I backed back down the drive to take another try at the huge pile, only this time it just slipped. I backed it back down to where I started and raised the seat to find that the outer casing of the belt had broken, only the rubber inner core of the belt was still intact.
The main belt was fine, but a bit glazed.
My question is, how long should a belt last? I got roughly 2 years, but only about 30 hours of use out of it. It was hard use though. The first season with it I plowed up a half acre garden, used it to spread driveway stone that same summer, and plowed about 20 smaller snow storms that year. This year it only had to plow once so far, and I broke the belt. I never felt it slip before, it just broke all at once.
I've actually been pretty impressed with what this thing will move, nothing seems to stop it. The first year I used it, with original belts still in place, I was breaking up new sod for a garden at a buddies place, it came to a sudden stop and started digging in, I backed up, gave it another shot and unearthed a badly rusted old 6 cylinder engine block.
I couldn't believe it pulled it up out of the ground. I've also used it to pull out about 15 bushes that made up a hedge row on one side of the yard last fall.