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Farmall Tractors Discussion Board |
Re: What is an overrunning clutch?
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Posted by ro on August 03, 1999 at 08:19:28 from (129.237.241.16):
In Reply to: What is an overrunning clutch? posted by Ryan on August 03, 1999 at 07:27:44:
It is normally a device which installs on the tractor PTO shaft. The implement PTO then connects to the overrunning clutch. The purpose of the overrunning clutch is to prevent the momentum of the implement from acting like a flywheel, through the PTO to the tractor. For example, on older tractors without independent PTO, the PTO is driven through the transmission. Without the overunning clutch, if the operator engages the normal tractor clutch to stop forward speed, the 'flywheel' action of the implement will continue to power the transmission and the tractor will continue to move until the implement stops rotating or the PTO is disengaged. This was a major safety improvement for older tractors used with rotary mowers. The overrunning clutch enables power to be transmitted in only direction from the tractor PTO. When the tractor PTO stops, the implement PTO simply continues to rotate until it loses its energy. A series of spring racheting 'dogs' inside the overrunning clutch enable it to rotate without imparting power to the tractor PTO.
Think of the overrunning clutch like your ratchet you use with socket wrenches. You choose which way
you exert power to the socket. On the overrunning clutch, you don't have a choice, its only directional.
An overrunning clutch for a rotary mower is probably the wisest $50 one can spend on the machine.
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