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Problem with slipping clutch on '48 JD B

M

Mike Burgan

New User
I have a 1948 John Deere B with a slipping clutch. It have replaced the: inner and outer clutch facings, the sliding disk drive, the clutch disk and facings (as a unit), and even the fixed clutch disk drive. In order to get the tractor to move, I have had to tightened the three clutch adjusting nuts down until they are about 1/6th of a turn from being fully tightened. As you can see in the attached pictures the whole pulley assembly is sitting away from the tractor body (19/32" away with clutch engaged and 15/32" away when clutch is disengaged. It has been like that for several years, but always had clutch, and the gear was lined up with the first reduction gear, so I was not too worried (maybe I should have been). The tractor made it through the winter pushing snow (north Idaho) but just barely. Now it has trouble just getting up the hill in 2nd gear on its own. Any ideas on what is happening, and what I should check??
<image src="http://forums.yesterdaystractors.com/photos/mvphoto13102.jpg"/>

<image src="http://forums.yesterdaystractors.com/photos/mvphoto13103.jpg"/>
 
I would take the pulley off and check the operating sleeve if it can rotate on the pulley that is the problem there is a pin that makes it turn with the pulley it be may be ware out same with the hole in the sleeve
 
Is the drive disc set in far enough? Repros are sometimes shoddy as taper fit isn't easy to get exact...Another place to check is crank endplay, both will allow an out of adjustment clutch to be a problem. I'd start w crank endplay and work backward. If overspec, quick fix
 
The flywheel would need to let crankshaft move about 1/2 in to be the problem i would bet
its in the operating sleeve. i have seen this many times in my 50 some odd years of
working on JD tractors. IF you need parts i can help
 
The flywheel would need to let crankshaft move about 1/2 in to be the problem i would bet
its in the operating sleeve. i have seen this many times in my 50 some odd years of
working on JD tractors
 
Thanks Kent and streetrod00. I haven't had a chance to pull the tractor into the shop yet. Hoping to not have to work as late the next night or two. I'll pull the pulley out as soon as I can, and let you know. Thanks again, Mike
 
Had a heck of a time getting the wheel moved out so could take the pulley out, but finally got it moved out. The operating sleeve does rotate about 7/128" (0.0545"). Is that enough to cause a problem? I also noticed the dogs have lots of slop (17/128, 7/64 and 15/64"). The dogs also had a lot of slop on the stud they pivot on. Seems like that would also contribute to the clutch slipping. Is that correct? Streetrod, there is also some excess endplay in the crankshaft. I measured it Friday night, and can't remember what it is now, but I'm thinking it was somewhere around 7/64" or so. I'll correct that once I get the pulley back on the tractor.

mvphoto13554.jpg
 
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