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JD 40 Clutch Problem???

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Abe

04-12-2003 20:35:31




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Just finished a rebuild of JD 40T engine installed a new pressure plate and driven disk purchased from JD. Flywheel cut by local machine shop. Clutch won't release completely when pedal is depressed. I've tried everything. Adjusted the pressure plate per instructions and then a 1/16th of an inch from one direction to the other without success. Checked linkage OK. Reinstalled old clutch and it seems to work but is noisy (chatters)sometimes when pedal is depressed. Any thoughts would be greatly appreciated. Thanks in advance.

Abe

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Clooney

04-13-2003 04:55:56




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 Re: JD 40 Clutch Problem??? in reply to Abe, 04-12-2003 20:35:31  
Abe, that is a difficult problem to diagnose on the Dubuque tractor as you can't see the pressure plate at the disk area when it's assembled.
~About all I can do ask more questions & you can judge from there.
~You said "Flywheel cut by local machine shop"?... Did they cut both the disk surface & the pressure plate mounting area the same? If not the pressure plate is now sitting at a different height from the clutch disk than it was designed for.
~Was there ANY slop or elongation in the clutch operating rod, throw-out fork, clutch pedal cross shaft or pivot pins? If so you are probably losing motion & throw-out bearing movement. ~With the clutch disk & pressure plate bolted to the flywheel are the pressure plate fingers ALL at the same height? [if they aren't set to the same height the clutch won't release the same all the way around]. ~Here is a real possible cause..does the new disk slide smoothly on the drive shaft splines? If not it could be hanging up on the splines & not moving away from the flywheel completely.
~Seeing as the flywheel was cut is there any chance the new disk is now hitting the flywheel attaching bolt heads?
~A few years ago I had a 40 that had the same problem as you are seeing , after taking it apart & finding nothing wrong I put it back together & adjusted the clutch pedal free play to [1/32" lash] then used the tractor... It took about 3 weeks but the clutch finally broke in & started working. When it was first assembled it would only release with the trans in gear but not when in neutral. Within 2 weeks of use it would release enough to shift but not put in gear from neutral, about another week on the brush hog & it has worked fine ever since.....

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Abe

04-14-2003 18:46:03




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 Re: Re: JD 40 Clutch Problem??? in reply to Clooney , 04-13-2003 04:55:56  
Thanks for the advice. I'm relatively new to working with old tractors so experience is welcome. I talked with the machinist and he said he cut both surfaces same amount. The directions that came with the new plate had a measurement for the difference and the flywheel checked out good.

I'll check all the connections and linkage again when I get it separated. I didn't install a new throwout bearing because it seemed fine and I got in a hurry (oops). I've got a new one on the way. When it gets here I'll remove and check all the parts. It seems logical that maybe the the disk isn't sliding on the splines like it should. Maybe the shaft is bent? Burred? Wayne's thought about the bearing moving on the carrier or the bent rod could be as well. I only gave it a cursory look.

The directions that came with the new pressure plate indicates the driven disk is supposed to measure .320". The old one measures exactly .320". The new one from JD is nearly .20" thicker. Could that be enough to prevent the pressure plate from releaing far enough? Thanks again for your help. I'll let you know what I find.

Abe

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Wayne in Tn.

04-13-2003 09:05:09




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 Re: Re: JD 40 Clutch Problem??? in reply to Clooney , 04-13-2003 04:55:56  
Abe, to add to Clooney's advice: Sometimes the actuating rod (the long rod running from the pedal to the throw out carrier), will bend or flex. I have had this happen on a 430. Had to reinforce the rod by welding another alongside it. Also the tube, the throw out bearing slides on, can come loose in the housing, it is just pressed in there and is no more than a piece of exaust pipe. This will allow it to move with the bearing and come in contact with the pressure plate fingers. It can be tack welded to the housing. But as Clooney said, I suspect the surfacing of the flywheel, may be the problem. You may have to try to find another flywheel. If you have used up all the adjustment and it still will not release, this means it is not pressing the fingers deep enough. Also check the bearing carrier for wear where the linkages connect.

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Clooney

04-13-2003 09:47:45




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 Re: Re: Re: JD 40 Clutch Problem??? in reply to Wayne in Tn., 04-13-2003 09:05:09  
Wayne, that's a good point on that clutch rod bending. If that new pressure plate has heavy duty springs in it that rod could bend with the new clutch but not so bad with the original...



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Wayne in Tn.

04-13-2003 16:01:10




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 Re: Re: Re: Re: JD 40 Clutch Problem??? in reply to Clooney , 04-13-2003 09:47:45  
Clooney, I had that problem with a dual-clutch 430 once. The rod had bent and had rubbed the side of the housing until it was half way worn through..



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