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JD B Clutch Problem

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jeff

08-16-2000 14:18:15




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Have my B clutch apart. The brass collar that engages the clutch is out. It looks good but can't figure out how it works. The clutch is not disengaging so have to take it apart further. Does anyone know how this part engages the clutch and how it operates. We have the book on it but it does explain it too well. Thanks.




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clooney

08-16-2000 16:18:54




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 Re: JD B Clutch Problem in reply to jeff, 08-16-2000 14:18:15  
Jeff, you might as well ask me to explain the meaning of life. I know how a John Deere clutch works. The question is will you know how it works when I am done trying to explain it!.....That brass collar you removed fits in a groove in the sleeve ( the movable part with the reverse cut threads on the outside of it). When you move the clutch lever it in turn moves the brass collar & because the brass collar is in a groove in the sleeve it moves the sleeve in & out. On the outside of the sleeve down close to the pulley (on the other end from the collar groove) are 3 holes in the outside of the sleeve, these holes are about 1/2" deep, so when the sleeve moves in & out the holes move in & out also, in these holes are 3 toggles (they are little pins about 2" long) they stick out of the holes & have a half ball on each end, so when the sleeve moves in & out the holes in the sleeve with the toggles in them move in & out also. The outer end of the toggles go into holes in little "L" shaped pivots called "dogs", these dogs are allowed to pivot but are fixed to the pulley so they can not move in & out with the sleeve. When the sleeve is moved all the way in towards the tractor the holes & inner ends of the toggles are moved in also (the toggles are layed over at an angle), when the sleeve is moved away from the tractor the holes with the inner end of the toggles are moved out & since the dogs can't move in or out the holes in the sleeve & the holes in the dogs get closer to each other & this forces the toggles to stand straight up (they actually go a little past straight up & start to lay over the other way) when they go past straight up (over center) is when you feel that snap in the clutch when it is engaged (that also keeps it engaged until the toggles are pulled back to lay over in the original direction) Those toggles work like putting a stick at an angle under a table or object then taking a hammer & driving the bottom of the stick in the same direction as the top of the stick, the closer that stick gets to straight up & down the more it lifts the table, if you drive it too far then it will have to be driven back over center to let the table back down. Now that we have determined that the toggles lay down & stand up, we have also determined that the dogs are "L" shaped & the toggles move one leg of the "L" as they stand up or lay down. When one leg of the "L" shaped dog is moved the other leg moves with it & seeing as it is "L" shaped the other leg moves at a right angle to the to the one being moved by the toggle. Thaose legs of the dogs have a slots cut in them that the big bolts that move the clutch adjusting disk pass through, those bolts also pass through the pulley to get from the inside of the pulley to outside where the clutch is located. When the dogs are moved (rotated) by the toggles they pull on the head of the bolts (oblong heads) & when the bolts are pulled they pull the "clutch adjusting disk" (pressure plate)in towards the tractor & pull the clutch disks & drivers together & also pull the inner clutch facing tight between the pulley & clutch driver by sliding the pulley out away from the tractor. When you turn the adjusting nuts on those bolts you are changing the length of the bolts between the dogs & the clutch adjusting disk, the shorter those bolts are the tighter the clutch is applied. I don't know how clear this has been so if you or anybody else has questions please post a follow-up..... ..clooney

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Durbco

08-18-2000 07:20:36




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 Re: Re: JD B Clutch Problem in reply to clooney, 08-16-2000 16:18:54  
Clooney, the John Deere gods are smiling. Thank you for your sharing.



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Bayou Dave

08-16-2000 16:36:13




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 Re: Re: JD B Clutch Problem in reply to clooney, 08-16-2000 16:18:54  
Jeff, Clooney described it the best it can be described, best thing is to dive into it. Won't take 10 mins to pull it down, you will see how it works, they are pretty basic. The only problem you might have is if you have to move a rear wheel that hasn't been moved in 40 yrs. before you can pull the assembly off. Any JD dealer should be able to pull up an exploded view of the clutch assembly, just step behind the counter and point to the parts you need. It might just need a good cleaning, or adjusting. Good luck with it.

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