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4020 clutch set-up questions.
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mschultz
Posted 6/4/2018 13:53 (#6794731)
Subject: 4020 clutch set-up questions.


Oregon
A friend of mine picked up a well-worn 4020 last spring. It needed a clutch so he split it, resurfaced the flywheel, and had his local Deere dealer set up the new clutch in their shop.

After assembly, he could not release the clutch with the clutch pedal travel. It seems that the old flywheel was now too thin, and so the Dealer says that he needs a new flywheel.

I have not found a flywheel specification. He has ordered a new one from A&I. Now he is planning on returning to the dealer to have the same shop set up the clutch on the new flywheel.

Can a 4020 flywheel be too thin to properly actuate the clutch?

Could the dealer set up the new clutch in a way that causes the same problem, no matter how thick the flywheel?


Thanks,

-Mike
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MiradaAcres
Posted 6/4/2018 14:29 (#6794761 - in reply to #6794731)
Subject: RE: 4020 clutch set-up questions.



scmn
When the resurfacing the flywheel there is a spec for depth from flywheel surface to clutch mounting surface (2.909 max). Most places will machine the face and the lip the same to keep the original depth. The clutch should be adjusted with JDE-61 before installing. Did he replace the throw out bearing?

I would suspect that either the clutch fingers are not adjusted properly or the throw out bearing is shot.

Edited by MiradaAcres 6/4/2018 14:32




(clutch (full).JPG)



(clutch tool (full).JPG)



Attachments
----------------
Attachments clutch (full).JPG (128KB - 99 downloads)
Attachments clutch tool (full).JPG (201KB - 117 downloads)
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Turbo 8820
Posted 6/4/2018 14:36 (#6794769 - in reply to #6794731)
Subject: RE: 4020 clutch set-up questions.


S.E. Washington
Also, there is an adjustment on the clutch pedal itself.
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mschultz
Posted 6/4/2018 14:36 (#6794771 - in reply to #6794761)
Subject: RE: 4020 clutch set-up questions.


Oregon
Yep, he replaced the throwout bearing.

I think what happened, based upon your input, is that the lip was not machined to keep the flywheel surface to clutch surface depth.

The dealer said that there is no specification for that and just set the clutch up on whatever flywheel showed up.

Kinda surprised that no one, in the whole precess, caught it. I asked about the lip depth and see what he says.

-Mike
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mschultz
Posted 6/4/2018 14:38 (#6794775 - in reply to #6794761)
Subject: RE: 4020 clutch set-up questions.


Oregon
Thanks for the attachment. Just what he needed. I appreciate it.

-Mike
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MiradaAcres
Posted 6/4/2018 14:42 (#6794780 - in reply to #6794769)
Subject: RE: 4020 clutch set-up questions.



scmn
+1. As the clutch wears, the pedal is moved forward on the adjustment, effectively moving the contact of the throw out bearing rearward on the machine since the fingers protrude out furthest from the clutch when the clutch disc is worn out. If the clutch pedal is not adjusted, the throw out bearing might not contact the fingers.
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mschultz
Posted 6/4/2018 14:45 (#6794783 - in reply to #6794780)
Subject: RE: 4020 clutch set-up questions.


Oregon
Yeah, he has been through that. The problem is that there is not enough range in that adjustment. And you nailed the reason why- the step is the wrong specification and no one caught it.

Thanks,

-Mike
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ronm
Posted 6/4/2018 15:07 (#6794794 - in reply to #6794731)
Subject: RE: 4020 clutch set-up questions.


Fruita CO
Some shops will machine an equal amount off the back surface of the flywheel where the clutch cover mounts, to avoid losing spring tension. On a JD flywheel, this is wrong...it moves the whole clutch farther away from the throwout bearing, & you lose adjustment on the pedal, if it's adjusted with the gauge. It's OK on a truck or other application where you have a boatload of adjustment, but not on these tractors. I have argued this point with machine shops for 40 years. DON'T let them face the back surface. Compensate for the loss of spring tension with shims under the springs. 1/2" flat washers will do...The only way to get all the adjustment with the back face cut off is by manually adjusting each finger to the throwout bearing after the tractor is back together, & that is a PITA...
Even though the page posted is from a 3020 book, (helps to post the right manual if you're going to put it on the Internet), the .060 & 2.909 max. dimension holds true on the 4020. What happens if you face too much off is the rivets on the disk hub will drag on the flywheel bolts. a 4320 is worse about this than any other, but they will all do it.
Also, the clutch needs to be set up on the flywheel it's going to be run with, especially if it has been faced.

Edited by ronm 6/4/2018 15:19
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KTA
Posted 6/4/2018 15:45 (#6794838 - in reply to #6794731)
Subject: RE: 4020 clutch set-up questions.


To answer the original question there are plenty of worn out flywheels that will NOT stand resurfacing. Once you been through the wringer on two splits and clutch setups you learn to measure.
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ronm
Posted 6/4/2018 16:30 (#6794886 - in reply to #6794838)
Subject: RE: 4020 clutch set-up questions.


Fruita CO
+1 on that-they are basically a simple clutch, but they do have to be done right...
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MiradaAcres
Posted 6/4/2018 16:40 (#6794898 - in reply to #6794794)
Subject: RE: 4020 clutch set-up questions.



scmn
I should have noted that image was from a 3020 manual and since the 4020 and 3020 use the same flywheels the specs are the same.
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mschultz
Posted 6/4/2018 17:13 (#6794934 - in reply to #6794886)
Subject: RE: 4020 clutch set-up questions.


Oregon
I think he is learning the lesson about the value of reading the service manual specifications.

-Mike
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2577
Posted 6/4/2018 17:22 (#6794945 - in reply to #6794934)
Subject: RE: 4020 clutch set-up questions.


western NY
It sounds like the jd dealer service tech needs to read repair manual and specs. They should be doing the labor for free.
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ronm
Posted 6/4/2018 17:34 (#6794963 - in reply to #6794945)
Subject: RE: 4020 clutch set-up questions.


Fruita CO
Yep, I suspect the tractor is about the same age as the tech's Grandpa.
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RickB
Posted 6/4/2018 18:44 (#6795043 - in reply to #6794771)
Subject: RE: 4020 clutch set-up questions.



Lincoln County. NC
mschultz - 6/4/2018 15:36

Yep, he replaced the throwout bearing.

I think what happened, based upon your input, is that the lip was not machined to keep the flywheel surface to clutch surface depth.

The dealer said that there is no specification for that and just set the clutch up on whatever flywheel showed up.

Kinda surprised that no one, in the whole precess, caught it. I asked about the lip depth and see what he says.

-Mike


The dealership employee that said that isn’t qualified to advise anyone on clutches. HyCapacity has flywheel step dimensions right with their clutch listings. I have never found them to be wrong. Doesn’t matter what you think of their clutches, the info is there.
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