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Re: MF-50 PTO clutch won't disengage


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Posted by used red mn on July 07, 2020 at 10:26:22 from (172.58.83.142):

In Reply to: MF-50 PTO clutch won't disengage posted by marksingb on July 06, 2020 at 19:01:57:

Mark welcome to YT! It was a good thought to try and break the clutch loose by heavy use, however what you did turned out to simply be mind over matter or really in this case the opposite. Now I am pretty sure a 50 has a live PTO by way of a two stage clutch. I am thinking a Rotovator is a tiller type implement that is used moving forward in a gear. The trouble with that is when in gear and moving the PTO clutch is engaged because it engages in the first part of the travel. Or in other words as you are letting the clutch pedal up from being fully depressed. So as you were tilling the PTO clutch was staying engaged just as it should. To be at all successful at breaking the clutch free you need to be trying whatever method it is while the clutch pedal is down all the way. Here it what I will recommend you try. I am not sure how much spinning inertia a Rotovator has but you can try it. Raise it above the ground and shut the engine off and engage the PTO, start it up and bring it up to 3/4 throttle or 3/4 of full rpms. Hold the clutch all the way done as if you are disengaging the PTO. Then move the throttle quickly to wide open. Then in a second or so back to idle and in another second back up to full throttle. You are just trying to get the slack in the drive train to provide a physical shock to the center of the PTO clutch to break it loose. If the Rotovator won’t make it come loose try your brush mower, those usually have pretty good spinning inertia. If you get the right up and down rhythm going on the throttle the shock and jerking may seem pretty severe on the PTO but that is what it will take to get it to come free. To answer Eric’s question one reason a new clutch will stick easier is because the newly machine surfaces of the pressure plate and flywheel if it was machined can rust readily from small amounts of condensation. It seems like once they are burnish some by the clutch lining the surfaces are less susceptible to rusting and sticking. If you get it unstuck I would suggest storing your tractor with the clutch blocked down in some way. Good luck!


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