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I noticed they said snowcat here, but other images I've seen of the plow he has had wheels. Timestamped here
Washoe County Sheriff Darin Balaam said on Tuesday during a press conference that Renner was run over by his snowcat, a device to remove snow, after the machinery started to roll away when he was not in the driver’s seat. He was injured during an attempt to get back into the snowcat, Balaam said. >

It was being reported initially as a safety system failure by at least two news outlets. I am not seeing that dialog now. >

That could still be true - sounds like it started moving without a driver.  Maybe a break failure. >

Or he didn't engage it fully. We just don't know. >

Did he curb his wheels properly?
I joke, but that's why you're supposed to turn your wheels - in case the car "pops" out of gear. Not that a snowcat has wheels... But the point is that we curb our wheels (and it's the law) because the machines are mechanical devices (even well maintained ones) that are susceptible to failure. >

I don't think you can curb a vehicle with treads. It maneuvers by rotating one side of treads more or less than the other. They always remain in the same orientation relative to the vehicle's body/cab. I think it's more likely that someone ran him over, or he did something like the guy in this video (@44s mark), but maybe stuck his leg out without being attached to a kill-switch. >

Fuck, I'm just glad to see him conscious. Snow cats are no joke and the fact that he's not in a freaking coma or something is great news. By all accounts he loves it there and tries to help his neighbors and this is poor recompense for being a great neighbor. Hopefully he recovers well. >

I had been imagining a snowmobile with some kind of plow attachment (I don't see much snow or related equipment where I am), but now that I've seen a picture, that is a massive piece of machinery.  
He's lucky to be alive. >

Being run over by a snow plow isn't as bad as it might seem, because it distributes its weight over a large surface area, but it could still have easily been a fatal accident. >

It weighs 7 tons. I don't care how that's distributed. >

I’m relieved that he’s conscious and talking so now I can finally relax a little hoping to a full recovery. >

Now I only have Damar Hamlin to worry about. >

Fingers crossed. That was a rough thing to watch. >

Being from the UK i had no clue what a snowcat was.. holy shit! If that thing was moving and I fell into it I’d just accept my fate lol, hope he recovers soon! >

Still has killer hair. Rest up my dude. >

Ha, I thought the same thing! Man, I would look like shit right now in his situation. Hes lookin good, but man I'm sure he's hurting. Best wishes. >

Likely, he had it combed and styled. That it was safe enough for him to have his neck moved around for something not medically necessary is a good sign of no spinal cord involvement. >

This is a GREAT picture to see. I really, truly thought he wasn't going to survive and to see him taking a selfie is beautiful thing to behold. >

I'm so damn relieved.  
I don't know him, never met him, etc, etc, but just seeing someone make it through something that, by all rights, likely should have killed them just feels... good, I guess. >

I looked up snowcat on youtube and CNN did a commercial for the things 5 years ago.  So you have an idea how Renner got so hurt just trying to climb back in and getting knocked off. >

Basically a giant meat mangler. Those tracks are serious business! >

Man the news of his accident really hit me hard. Glad he’s doing well enough to share this with us. Hope he has a speedy recovery >

If I had to guess, he tried to get back in, fell under the front driver-side wheel, and it rolled over him, along with the plow chewing up his leg(s).
Good to see things are on the up and up. >

Snowcat has a track on each side, not wheels, so the fact it was moving without him in it probably means he lost footing trying to stand on the moving track while re-entering.  I guess whether it's just being run over by the track or both the track and the plow would depend on which direction the snowcat had started moving, as to whether the motion of the track would have carried him forward or back.