Hey all, thanks for the info on slip clutches! Especially slip clutches vs. override clutches--I think I was about to spring for an override clutch and try to use it like a slip clutch which I think would totally not work. My thought was that having a slip clutch on the tractor end (on the six-spline pto stub) would let me use all my old implements with slip clutch protection for the drive train. But from what I've been hearing, I think slip clutches are pretty much only for the implement end and you need one for each implement. Am I right? Or does anyone know of a "tractor-end" slip clutch?
Also, I busted a PTO shaft when my flail mower got a fresh walnut branch wound around in it, and I've heard that belt-drive implements shouldn't need a slip clutch or shear bolt since the belt should slip if the implement is bound. Well, this happened on my flail mower and the belt sure didn't slip, it sheared off the square tubing of the pto on the implement end and I am wondering what's the deal? All I can think of is 1) I really do need a slip clutch or shear bolt on the flail mower, or 2) that pto shaft was already cracked and ready to bust, and thus weaker than the belt. The break line on the tubing was bright new metal on one side, but a little rusty on the other side of the break, this makes me think it already had a crack. What do you all think?
Also, does anyone know where to buy just the plastic pto guard (this one didn't have a guard and I'm just lucky that spinning pto didn't throw shrapnel into me!) I could put in this pto if I get it welded with new square tubing?