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Tractor Talk Discussion Forum

JD 850 Clutch

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Thomas J. Niema

05-21-2008 08:57:04




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I had my JD dealer replace the clutch on my 850 (3 cyl Yanmar diesel). When you let the clutch out it grabs. You can not ease it out. They say that this is normal because it is a ceramic disc plate. It is dangerous to drive as it is either stop or go, and it really jumps. Any suggestions?




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Mark - IN.

05-21-2008 21:44:01




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 Re: JD 850 Clutch in reply to Thomas J. Nieman, 05-21-2008 08:57:04  
That could be I suppose, but that don't sound right for that tractor. I do have a 950 that I use occasionally, and have never had that problem. Basically, the 850, 950, and 1050 are the same tractors, like 23HP, 25HP, and 27HP. The 1050 having a turbo. And there's a 900 series commercial tractor in there somewhere. My 950's a 1980 model, and I had it split out a couple or few years ago rebuilding the trans, which involved replacing the shifter fork, flywheel, pressure plate and disc. I don't recall if used a ceramic or not. I know that there were changes at a certain serial number, and mine I believe was one of the first series. I have the maintenance manual at home in Indiana, but won't be home until Friday night. From the serial number, I could look it up and see what was used, even part numbers. That does you no good now though. I've seen several 850's in use in several different prisons, and I don't recall them being dump the clutch and go. Could be, but one of the prisons is a women's prison with females operating them. I recall seeing a grounds maintenance guy having one of the female inmates easing the tractor forward and backward so he could slip a belly mower under it. Now...being that inmates don't want to be there in the first place, and this was a maximum security prison where they had females that murdered people, I'm not seeing that maintenance guy trusting her enough to do that given that if she ran him over, she'd have the excuse that the ceramic clutch is a dump and go, so he got run over. See what I mean? I guess it could be, but... Heck, I use my 950 for augering holes for fence posts because its small and manuverable, and then using the front end loader to set railroad ties as fence posts, inching forward, backward, sideways to do that. Heck, if my clutch was a dump and go trying to use it for those manuvers, I'd have set that thing on fire out in a field years ago. I didn't have that problem before I split it, haven't had that problem since splitting it. I don't use my 950 a lot because its too small for many jobs, but there are some things I can and do use it for, under the right conditions. The biggest problem I have with my 950 is has turf tires on it and they're useless. But, once I replace them, and I will, will be able to use it more often than not. There are far more times I don't need to be using a 100+ HP tractor to be doing what a 25HP tractor can and should handle, especially since I've got the dang thing.

Mark

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Thomas J. Nieman

05-22-2008 05:24:02




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 Re: JD 850 Clutch in reply to Mark - IN., 05-21-2008 21:44:01  
The 850 is a 1989 model. The original clutch operated as any other clutch, fairly smooth. When I had it replaced the JD dealer said all replacement clutches are ceramic because the original clutches did not hold up. Point taken. But a 25hp tractor doesn't have much power and if you have to idle down in order to take off smoothly the tractor stalls out. It has to be at about half throttle to take off and the front end, even with a bucket, will jump off the ground. So you can see it is a death trap. Is there any way to adjust the clutch to get some relief, even at the risk of wearing out the clutch? Thanks.

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Mark - IN.

05-22-2008 14:52:27




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 Re: JD 850 Clutch in reply to Thomas J. Nieman, 05-22-2008 05:24:02  
I'm out of town until tomorrow night. I'll crack the manual on it and post back, but not today. Manual's at home. Nope, I'd say something aint right with what you describe. Did it do what you're saying while was at the dealer? I mean, did they actually see it doing that? I'm sure they don't want to eat the cost of splitting it again, but... Did they replace or machine the flywheel and pressure plate so aren't chewed up on their faces?

I'll look at the manual and see what it says you can or can't do, and if is something and it works, great. If not, I'd invite the Deere guy over and tell him to give it a whirl, then ask how supposed to use that without wrecking or killing something or someone.

Mark

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Mark - IN.

05-22-2008 15:05:07




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 Re: JD 850 Clutch in reply to Mark - IN., 05-22-2008 14:52:27  
And by the way, the only time I could even imagine lifting the front off the ground would be if the splitter was in the upper range and I had it wound up and was in the equivelent of 7th or 8th gear and I dumped the clutch, but even then would be driving around like trying to break the land speed record in road gear.

Your '89 does have a upper and lower range splitter with the handle located on the right side of trans under the seat doesn't it? OK, so it grabs hard, but once it grabs, what's your speed like after that?

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Haywood

05-21-2008 09:50:04




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 Re: JD 850 Clutch in reply to Thomas J. Nieman, 05-21-2008 08:57:04  
Ceramic Clutches are not designed to be feathered. They hook up quickly with no slippage.
It takes a little getting used to.

For that matter Rag Clutches really weren't really designed to be Feathered but can easily.
That is why they wear out quicker than ceramic.

The Flywheels need to be Turned prior to installing a new ceramic clutch or there will be problems.



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Mike M

05-21-2008 09:21:13




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 Re: JD 850 Clutch in reply to Thomas J. Nieman, 05-21-2008 08:57:04  
You may want to ask this over at the JD board as a fellow there just put a new one in his 850. some ceramics can be grabby I'm told ? Ask your dealer if that is the same type of clutch that came new in a model 750. If it is then you got problems because dads 750 always worked smooth from day 1 and has 2200 hours on it now.



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