I’ve heard plenty of other ideas here that equal getting nothing done. If I couldn’t till any rocks I might as well scrap the thing.
On my tiller To first slip the clutch to make sure it wasn't stuck, just loosen the adjuster bolts, turn on the tiller and stick it in the ground till I see the clutch slip.
Then I snugged the adjuster bolts some and tilled.
If the clutch slipped to easy I tightened them a little more. Kept doing that till I had it set where I like it.
Once set, each year I loosen the slip clutch adjusting bolts (counting the number of turns). I stick the tiller in the ground to force the clutch to slip (making sure it isn't stuck).
Then I retighten the bolts the same number of turns I originally had them set at and go.
This wasn't about tilling small rocks. This is about a tractor stall due to a stump that has a shallow grave that was supposed to be ground down (all in all my fault) and finding a large chunk of concrete that also had a shallow grave. Hence the previous suggestion of walking the ground and poking.
What would you suggest for those instances? I'll take all the good advice I can get.
Once I loosen my slip clutch adjusters, turn the tiller on and stick it in the dirt to slip it. Its easy to see it slipping.Once loosened, (if clutch isn't rusted), one can turn the tractor's pto on, with the tractor OFF (locking pto shaft in place) then turn the tiller by hand (or bar) and watching that the pto shaft doesn't turn. This might be easier than trying to figure if disk slipped by using marks or running the tiller into the dirt.