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John Deere Tractors Discussion Forum
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1966 4020 synchro clutch slipping

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Pg1967

03-07-2018 15:29:40




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Had the transmission rebuilt last year and had a new clutch installed. Noticed clutch is beginning to slip especially in 8th gear. It's only been a year on the new clutch. Shop has always done a good job in the past. Any ideas.




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D-

03-08-2018 06:05:52




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 Re: 1966 4020 synchro clutch slipping in reply to Pg1967, 03-07-2018 15:29:40  
Like Tim I replace worn flywheels with new. Old ones are usually cracked anyway. Grinding was too expensive, surfaces ended up being too rough and local shops have gone out of business.



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fdt860

03-08-2018 00:07:22




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 Re: 1966 4020 synchro clutch slipping in reply to Pg1967, 03-07-2018 15:29:40  
Quoting Removed, click Modern View to see

Any decent shop remove same amount from bottom and top of flywheel, should not they?



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Tim S

03-08-2018 05:03:06




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 Re: 1966 4020 synchro clutch slipping in reply to fdt860, 03-08-2018 00:07:22  
Yes,that is a standard procedure,,but as the the depth of the curvature at the inner base of the fly wheel stays the same, and as it gets cut a few times over the life of the tractor this curvature will allow the pressure plate to bottom out in that area and not put full pressure on the clutch plate,, I have been getting new flywheels for $350,,,and the machine shop has been charging $125 to mill an old one,,so I have been using more new ones lately ..If you still have slippage with ample free travel I would go back to your repair shop and have him take a look at it...If it was one of my jobs here I would split it and inspect it free even after a years use...

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tomstractorsandtoys

03-07-2018 17:28:37




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 Re: 1966 4020 synchro clutch slipping in reply to Pg1967, 03-07-2018 15:29:40  
Is the rear engine seal or front trans seal leaking some oil on to it? That would be my second thought after adjustment. Did it just have a new clutch disc or did it have a clutch job which includes replacing plates,springs,fingers ect? Tom



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Tim S

03-07-2018 17:26:47




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 Re: 1966 4020 synchro clutch slipping in reply to Pg1967, 03-07-2018 15:29:40  
If the flywheel has been turn too many times the pressure plate can bottom out on the outer base of the inside of the flywheel, and after a little wear it shows up...but check the adjustment first should have about 1 1/2" free play at the pedal..



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coonie minnie

03-07-2018 15:59:04




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 Re: 1966 4020 synchro clutch slipping in reply to Pg1967, 03-07-2018 15:29:40  
Have you adjusted it???



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