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Restoration & Repair Tips Board

Over Running Coupler

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Tim Lerminiaux

01-20-2005 15:17:01

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Could someone please explain the purpose of the over running coupler PTO ? Is it used to enlarge the original pto shaft ?

Thanks

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txblu

01-22-2005 06:39:20

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Re: Over Running Coupler in reply to Tim Lerminiaux, 01-20-2005 15:17:01

Learning from experience.

Had a PTO shaft @ 1 1/8" dia on a really old piece of iron. Bought an overrun clutch that had that input and a 1 3/8 output which is standard today. You can also buy them 1 3/8 both in and out .

Didn't like to use it (for purposes mentioned below by others) as it was a loose link in the shaft and on a drag mower when you turned a corner, it made for just that much more vibration.

Was baling hay with a transmission driven pto one day and going down hill. Realized that I had to stop the machine as I couldn't execute a tight enough turn to get out of a situation. The implement was driving now (big flywheel revolving and had positive pressure on the pto shaft, which comes out of the transmission, driven by transmission gears and hence had the transmission "locked" in gear. Couldn't get the tranny into neutral; regardless of what I did.

Never did that again. Either used one or used a tractor with Live or Independent PTO.

Use it and keep it greased. Good luck.

Mark

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CNKS

01-20-2005 18:06:02

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Re: Over Running Coupler in reply to Tim Lerminiaux, 01-20-2005 15:17:01

Unless you have a really old tractor, pto shafts are pretty much standard, if not you can buy an adapter. The overrunning clutch disegages the pto shaft on the bushhog or what ever from the shaft in your transmission and keeps you from running into your neighbors fence when you intend to stop a couple of feet away from it.

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Dick L

01-20-2005 15:50:57

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Re: Over Running Coupler in reply to Tim Lerminiaux, 01-20-2005 15:17:01

Is also called an overrun clutch. The old tractors without a live power takeoff, when you push in the clutch the tractor will not stop quick without popping the tractor out of gear. What ever type of machine hooked to the tractor like a bush hog or combine that has inertia or parts that want to keep running will make the power takeoff continue to turn. The overrun clutch is free turning when this happen and takes the torque off the power takeoff and transmission gears. Back in the 1950"s we had never heard of an over run clutch so it was second nature to pop the tractor out of gear just as you pushed in the clutch. If you didn"t want to plug the combine you would forget you had a clutch untill you were ready to start running again. That was back when the dishwasher wore an apron and you didn"t want something you had never heard of.

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Jon H

01-23-2005 19:52:09

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Re: Over Running Coupler in reply to Dick L, 01-20-2005 15:50:57

One other point no one touched on is that the over running coupler will save wear on the pto brake of a live pto. I run a pto powered 1482 IH combine with my Steiger 4WD tractor. The rotation mass of that large rotary combine must be at least 1000 pounds,and even though I always shut the pto down at slow idle,17 years of stopping that much iron has killed the pto brake.

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