IMPLEMENT P.T.O. DRIVELINES

Travis_R · Sep 7, 2006

Howdy,

I need to know how much of each part of my driveshaft on my 6' LMC finish mower do I need to cut off to make it fit on my tractor's pto shaft?........I have a Yanmar YM2000 with an over-running clutch, or as some say, over-running "coupler".................Do I cut equal amounts off of both parts?........................I'm using it now without the over running clutch............NOT safe, and I think it pust stress on the transmission/pto.....

Thanks for the advice,

Travis R

Pooh_Bear · Sep 7, 2006

I can't tell you how much to cut off,
cause I don't know the length or the distance from the PTO to the gearbox.
But I can tell you that yes, you need to cut equal amounts off both halves.

Pooh Bear

Neophyte · Sep 8, 2006

Check page 7 & 8 of the following manual. It gives a good overview of how to cut your PTO shaft to fit.

http://www.bushhog.com/pdf-files/Squealer.pdf

You need a minimum of 6" of overlap at the longest path (from implement shaft to tractor PTO shaft) but you really want a little more than this. You just want to be sure the shaft does not "bottom out" at the shortest path. At the shortest path, you should have a couple of inches to spare to be safe. Obviously, you need to take into account the length of your over-running coupler.

Can someone explain an over-running coupler to me and why you would need one? Do you need one on a finish mower?

Farmwithjunk · Sep 8, 2006

Neophyte said:
Check page 7 & 8 of the following manual. It gives a good overview of how to cut your PTO shaft to fit.

http://www.bushhog.com/pdf-files/Squealer.pdf

You need a minimum of 6" of overlap at the longest path (from implement shaft to tractor PTO shaft) but you really want a little more than this. You just want to be sure the shaft does not "bottom out" at the shortest path. At the shortest path, you should have a couple of inches to spare to be safe. Obviously, you need to take into account the length of your over-running coupler.

Can someone explain an over-running coupler to me and why you would need one? Do you need one on a finish mower?

Over-running couplers are a band-aid fix to the problem of PTO equipment "pushing" a NON live power PTO equipped tractor. Take 8N Fords as an example. With a bush hog on the back, you could push in the clutch, and the "flywheel effect" of the mower would back feed the transmission, pushing the tractor on. The over-running clutch is a ratchet effect adaptor that goes on the tractors PTO stub, then connect the mowers PTO driveshaft to it. When you push in the clutch and stop powering the transmission, and push on the brakes, the over-running clutch would ratchet, allowing the mower to continue to spin WITHOUT pushing you and the tractor through the side of the barn.

Neophyte · Sep 8, 2006

Ahhh, good explanation. So it doesn't really apply to newer tractors?

Farmwithjunk · Sep 8, 2006

Neophyte said:
Ahhh, good explanation. So it doesn't really apply to newer tractors?

I'm not as up-to-date as some folks on all the newer compacts and subcompacts, but I understand there's a few produced WITHOUT live power. Not a direction I'd like to go myself, but if you happen to be in that situation, an over-running clutch could be the difference between going in the pond or not.

roxynoodle · Sep 8, 2006

Travis, cut the same amount off both sides. I had to do the same thing to use my rotary cutter on my Yanmar. Cut off the least amount you can get away with. Cheaper than buying a new, shorter PTO shaft.

mikim · Sep 8, 2006

I put an overrun clutch on my TC45 for one reason only -- it makes hooking up the shredder so much easier ...it's a BUNCH easier to turn that clutch to line up splines than the shredder shaft...