Anyone have a MechMaxx 3-pt stump grinder?

[rumwrks]

I went with a setting close to the 20-25 HP range to be safe…I have 32 PTO HP.

I set mine real close to 20HP and it didn't slip at all with a 45HP pto tractor. I'd suggest loosening it until it just slips and then tighten it back up a half turn or so.