I've got 2500' of dirt road that I use a 3PH snow blower on. It's a 54" unit on a Kubota B2910. Here's what I've found.
- Be sure your snow blower has skid shoes of some sort, and set them to hold the cutting edge an inch or so up. Maybe higher if your road surface is rough. The skids are a must-have.
- The first few times you run the blower, you may find that the skids dig/sink into the road surface and don't really hold up the blower. Once the ground freezes, this won't be a problem at all until spring thaw.
- If you happen to have a hydraulic top link, it can be very useful in angling the blower and skid to ride up over the road surface (leaving more snow behind), versus angling down to clear closer to the road surface. When the ground is softer, I tilt the blower up, and when the ground is frozen I tilt down. You can do this with a manual link as well, it's just less flexible.
- Small stones are not a problem, where small is anything under 2" or so. If your road surface is like mine, there are much bigger surprises to be uncovered. I blow out a sheer bolt almost evey time I plow due to a fallen chunk of a branch, or a grapefruit size rock that get's kicked up. My road is in rough shape, and runs thru dense woods with no shoulder at all, so it can't get much worse than what I've got. Doing a road patrol in the fall to clear out the stones helps a lot.
- Keep spare sheer bolts and nuts and appropriate wrenches with you on the tractor. It sure beats hauling **** back to the house for a repair.
- Enjoy the results! Snow blowers do a great job clearing and getting the snow out of the way. With a dirt road you'll need to pay attention to a few things that you can otherwise ignore, but all in all it's not a big deal.