The PTO one has that split tire type thing over the
chipper chute. I've never found it to hinder anything. I often run my hand past it (I know not to reach too far). Only time I've had trouble with any pieces giving trouble is green stuff leaving a sliver off to the side that somehow gets stuck in there. Always been able to pull them back out. Think I've only had one piece that I felt I needed to shut down to retrieve it. It didn't jam, just couldn't seem to push it through with another piece (usual fix), and it was too short to reach in there while running to pull it out.
Sounds as though the Brute is the what the Mac people call the commercial one. That's probably about the gauge metal that was in the TroyBilt. Heavy beast for its size.
I'd never be happy with a
chipper only rig, I don't think, but never had one to give it a try. Had a shredder-only Mac on the Gravely that I didn't care for. Mainly used it for leaves because it was just like the TPH except for lacking a
chipper blade (and that flywheel) and was much better than the TroyBilt for leaves.
Changing the
chipper blade is easy, as long as you have a proper allen wrench that fits onto a socket wrench, not one of those cheapo L-shapped ones, and as long as you're not so butterfingered as to drop either an allen screw or the blade. There's a little door on the back held on by a couple small screws. Open the door, rotate until blade comes into the window and then use allen wrench to remove. Clean out the allen screws well with an ice pick or tiny screwdriver, give the allen wrench a whack to seat it and then unscrew it, holding securely to the screw when it gets loose enough to come out. Put a tiny drop of blue Loctite onto the screw threads and bevel before putting them back in and let sit overnight.
If you drop a screw like I did, you'll need to drill a 5/8" hole in the bottom of the flywheel housing to retrieve it. If you drop the blade, you can probably remove the bolts holding in the outer bearing to let it drop out. Haven't done that yet.
Cliff can tell you all about how to rotate the hammers. Got a friend who has an engine-powered one who I passed Cliff's directions to for that. He said it was "a piece of cake". Said it didn't affect the performance of the machine. You really only need to rotate them when they get really rounded off. For mine, it's gonna be a long time.
Oh, Cliff, you need some good green paint for yours. Red. Ugh!
Ralph