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Clutch problem with JD Styled A

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Paul Buchert

08-18-2001 03:08:33




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My model A JD is snapping the 3/8 in bolts that hold the clutch adjustment plate to the fixed clutch drive. The problem started with the stripping the original bolts, finally one broke. I installed new bolts but the problem continues, I have now replaced two of the new bolts. The clutch appears to be working fine, but after three hours of work the new bolts snap. I can not imagine what is wrong, the local JD dealers around Knoxville are no help at all. I'd be grateful if anyone has any ideas I could try to find and fix the real problem. Thanks, Paul

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Paul Buchert

08-18-2001 08:36:33




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 Re: Clutch problem with JD Styled A in reply to Paul Buchert, 08-18-2001 03:08:33  
Thank you Clooney, rollo, Skip, Jim & zane for trying to help me with my clutch problem. My model A is a serial number 630xxx that does take a fine thread 8" fine thread bolt with a "T" head that cost 25.00 each. There must be an internal problem that first stripped the original bolts and is snapping the two new ones I have installed. The clutch face had been worked on at some time and not installed with the timing points lined up. The vibration was terrible but is gone now. There is a growling sound in the clutch when it is not engaged but it does not sound worse than last year. There is plenty of oil getting to the gears and there is not a build up of heat. I noticed that the clutch plate does not go all the way onto the tappered spline. It is about 1/2 " overhang, but the large bolt and washer appear to be holding it with no problem. It appears that the bolts only hold the adjustment disk and I can not imagine where all the tourque and pressure is coming form to do the damage. Thanks again.

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Clooney

08-18-2001 15:38:55




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 Re: Re: Clutch problem with JD Styled A in reply to Paul Buchert, 08-18-2001 08:36:33  
Paul, the distance that drive disk protrudes from the end of the crankshaft is controlled by the taper on the crank splines & internal taper of the splines in the drive disk & how tight the retaining bolt is tightened. Unless the drive disk was installed incorrectly in which case the drive disk would be tightened against the rivet & the rivet wouldn't be in the recess on the end of the crankshaft. If there was something behind the pulley keeping the pulley & drive disk from going all the way on the inner disk & pulley would be jammed together & the clutch wouldn't release with the hand lever. It does sound like the inner clutch disk isn't pulling it's end of the load though & making the outer disk carry the entire torque load. Half the outer torque load is carried by the operating bolts & if the outer disk is the only one working those bolts are carrying a big load.

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rollo

08-18-2001 14:46:23




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 Re: Re: Clutch problem with JD Styled A in reply to Paul Buchert, 08-18-2001 08:36:33  
Growling sounds bother me. I don't know how this can cause the bolts to break, but are you sure the clutch collar and fork are corectly assembled and inserted onto the pully properly. For the clutch disk to protrude 1/2" proud of the crankshaft, it seems that something in or behind the clutch pully isn't installed right. Maybe (?), that combined with a strong arm is how you create enough leverage to break these bolts.

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Paul Buchert

08-18-2001 19:10:32




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 Re: Re: Re: Clutch problem with JD Styled A in reply to rollo, 08-18-2001 14:46:23  
Rolo. Thanks for your interest. I will have to take the clutch out when I prepare to replace yet another bolt. I remember there being a smooth part on one of the components, that the "U" shaped part of the clutch assembly (I think that is what I removed off the front of the tractor that is attached to the clutch lever) so that I could take the assembly off to get to the head of the bolts to replace them. Maybe I am putting the thing together incorrectly. I am not over tightening the bolts, they appear to be at the right tention becasue the clutch makes a small pop sound when the clutch is dis engaged. I think I am doing something wrong somewhere, some how.

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Clooney

08-18-2001 10:40:56




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 Re: Re: Clutch problem with JD Styled A in reply to Paul Buchert, 08-18-2001 08:36:33  
Paul, is the one original broken or have just the 2 new ones broken? If all looks ok inside & the clutch is together corectly maybe there is a problem with the heat treatment on the new bolts. I think we all assumed you were using the incorrect bolts because you refered to 3/8" bolts. If the old bolt hasn't broken & the new ones have, call Shorty Dear (806-435-3968) or other used parts vendor & install used bolts, if they went long enough to become good used bolts they probably have a good heat treatment.

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Clooney

08-18-2001 07:12:54




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 Re: Clutch problem with JD Styled A in reply to Paul Buchert, 08-18-2001 03:08:33  
Paul, what year A are we talking about here? Well I'll give you both; the unstyled "A" & early styled through S/N 647999 used A 135R, 1/2" SPECIAL T headed drive bolts the later styled "A" 648000 up used A 4031R, 1/2" Special T headed drive bolts. (if you are talking an AR or AO these s/n breaks don't apply) There was a late revision to some drive bolts that reduced their o.d. in the center to help a step wear problem that caused a jerky clutch problem but I don't know if that applied to the "A" bolts or not (doesn't matter as it was for a smoothness problem & not a breakage problem anyway).

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rollo

08-18-2001 05:38:57




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 Re: Clutch problem with JD Styled A in reply to Paul Buchert, 08-18-2001 03:08:33  
I don't know what year model you have, but my '48 A has 1/2 inch bolts; not 3/8 inch. I could be wrong, but I thought the bolts (A135R or A4031R) were a special design that only came from JD.



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Skip

08-18-2001 04:41:56




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 Re: Clutch problem with JD Styled A in reply to Paul Buchert, 08-18-2001 03:08:33  
Those are most likely to be grade 8 bolts try that.



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JIM

08-18-2001 04:35:10




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 Re: Clutch problem with JD Styled A in reply to Paul Buchert, 08-18-2001 03:08:33  
Maybe you could use some harder bolts-like #5 or #8(blue colored) bolts. That may keep them from snapping. JIM



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zane

08-18-2001 05:35:00




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 Re: Re: Clutch problem with JD Styled A in reply to JIM, 08-18-2001 04:35:10  
I seem to remember that these are specialized "thru bolts", with T heads and fine threads. Did you ask your dealer for bolts, or PARTS?



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