JBMac

Member
Guys,
Posted this on the Massey forum, but I know some of you might not check it but still be able to help. I posted earlier that I bought a new 583 for a mowing contract. Very soon into it's operation, I smelled something under heavy load. I know what clutch smells like as well as what burning paint smells like. The smell was somewhere in between. There was no slipage. When I brought the tractor back home, the PTO was grinding, and most of the gears, with the clutch fully depressed. It was pulling a 7' Bushog, with a properly set slip clutch. Here's my qualm: the technician's notes say the clutch is not disengaging properly. Tractor has 99 hours on it. They want me to front $600 to split the tractor, to determine if it's a warranty issue. They say that all too often, somebody rode the clutch and its a wearable item, not covered under warranty.. There is a clearly worn area on the platform, under the pedal, where my boots wore the paint off. I guess the big question is: Even if I wore the clutch plates, would that prevent the clutch from disengaging? As a side note, I asked the technician to verify the clutch adjustment. His notes on the ticket say "Adjusted clutch to Massey specs. PTO will not disengage, returned to previous setting. It's a new tractor, first clutch adjustment is not for several hundred hours. David P., Masseynut, 135 fan, what do you think? This is a later model, but not completely unlike previous designs. The service manager is an idiot with no mechanical background. The technician is calling me in the morning to discuss, and I'd like to be armed. The big question is, what are the likely cuases of the 2-stage clutch to not disengage? Thanks for all the help, still owe lots of payments on this tractor.
 
If it will not disengage after slipping you have damaged the clutch disk or pressure plate. The clutch disk maybe warped or the facings have stacked up. The pressure plate can have broken a spring or diaphragm and is not fully releasing. There is no way to tell without splitting the tractor.

When clutch plates wear it reduces the free travel clearance. When the free travel is gone then the clutch slips even without you having your foot on it. Your PTO clutch may have needed adjusted sooner than you think because of your heavy usage. The ground drive half may have been fine but the PTO half needed adjusted. I am not sure on MF583 if you can adjust the PTO clutch on a live PTO setup from the outside. Many two stage or live PTOs are set by setting the pressure plate fingers during assembly and can"t be adjusted independent of each other after that. A 7 foot BUSH hog on a 73 PTO hp tractor in heavy right away mowing is at the low end of the range.

This issue shows the weakness of a two stage dry PTO clutch. For real heavy duty continuous use a independent oil bathed clutch will have many fewer issues.
 
Thank you so much for your insight. Lets hope it"s still covered under warranty, like I said, the slip-clutch on the bushhog was working and I did not ride the clutch. I agree, I wish I had IPTO!
 
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