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John Deere Tractors Discussion Forum
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4020 Clutch

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Mark Westphal

12-01-2004 06:56:21




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I have a 1968 JD 4020 that has a clutch that is out of adjustment and the clutch is just starting to slip under heavy load(starting uphill with a 17" field cultivator).

What other maintenence should I do when I change the clutch out on this young (3800 hr.) girl?

How difficult is it to change out the clutch?

Thanks,

Mark




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Earl G

12-01-2004 15:31:23




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 Re: 4020 Clutch in reply to Mark Westphal, 12-01-2004 06:56:21  
well before you go to all the trouble of trying to replace the clutch, make sure you have no more adjustment in the pedal, but a service manual will tell you how to adjust it before you go and split the tractor apart if it has any adjustment left



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Gpower

12-01-2004 08:57:40




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 Re: 4020 Clutch in reply to Mark Westphal, 12-01-2004 06:56:21  
Don't forget to have the flywheel resurfaced at this time. You will have to have the shoulders of the flywheel turned down the same amount as well, so that the clearances are the same for factory specs. You could get away (sometimes) without resurfacing, but if it has been sliping when you install the new clutch disk it will be riding on the tops of the scored surface rather than flat over the entire surface area. Good Luck

Gpower

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G/MAN

12-01-2004 07:32:03




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 Re: 4020 Clutch in reply to Mark Westphal, 12-01-2004 06:56:21  
Get yourself a service manual first and foremost. The clutches are pretty simple. The only special tools that are required besides splitting stands are the gauge for adjusting the fingers and a pilot tool to line up the traction clutch disk. You'd be well advised to replace the rear main seal while you're there, and inspect the flywheel ring gear, although at those low hours it should be okay. I'd also replace the seal on the trans input shaft. With any luck the rear seal retainer will come off without taking the pan gasket with it, but be forewarned that it could tear the pan gasket. At that point you can either piece in a new chunk using a new pan gasket, or remove the pan and replace the entire thing. I've done it both ways with good luck. Also inspect the traction clutch throwout bearing and the PTO engage bearings. And replace the pilot bearing in the crankshaft And normally we replace all the fingers, pins, operating bolts and nuts if they show any wear at all. The springs also aren't too expensive, so if you really want it back to factory specs, replace those too. It just depends on how far you want to go with it. And one more thing - set up and adjust the clutch with the flywheel on a a bench, then remove the clutch, install the flywheel on the crank and reinstall the clutch. It's a little easier that way than doing the adjustment with the clutch installed for good.

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Bob

12-01-2004 09:08:41




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 Re: 4020 Clutch in reply to G/MAN, 12-01-2004 07:32:03  
There are several unlined plate surfaces in there (including the flywheel face) that will likely be worn and grooved. Same for the PTO clutch, (if it has one, and you're fixing that while you're in there, too). Be sure to match-mark the clutch cover and flywheel before separating them.

The flywheel will likely need to be resurfaced and the "step" where the pressure plate sits gets machined also, to compensate for the amount worn off, and removed from the flywheel when it's ground "true". If this dimension is not maintained correctly, the spring tension on the pressure plate will not be as great as it should be, and the clutch will slip and fail again, if the tractor is used hard.

If the tractor has the optional ceri-metallic clutch disc, the flywheel WILL be badly worn, sometimes beyond re-use.

The springs can be tested if the dealer or machine shop has a spring tester, or just replaced, because if the clutch has ever been real hot, the springs will likely be weak.

The bottom line is that you can split the tractor yourself, and remove the clutch and flywheel, but you need to have a knowledgeable person (about DEERE clutches) look at it and measure it out and see what repairs are needed. Often, the Deere shops "farm out" their machine work to an automotive machine shop, and if you can find out which one in your area that does the Deere stuff for the dealers, you could take the flywheel and the clutch there for measuring and visual inspection, and grinding (if needed).

When the surfaces have been reground, and you have any new parts needed, you can assemble the clutch assembly yourself, and take the clutch and flywheel to the local Deere dealer, and pay them an hour or so's labor to reset the fingers, then you won't need the special tool, and HOPEFULLY, it will get done right! (When assembling the clutch to the flywheel for the dealer to set the fingers, align the match marks made before disassembly. Then, after the clutch fingers are set, it will have to come off of the flywheel for the flywheel to be installed on the engine, and then match the marks up AGAIN.)

I believe Deere also sells a complete re-man clutch assembly. It will not be cheap, but if your clutch is bad enough that a lot of parts are needed, that might be an option.

To reassemble the clutch you will need a clutch alignment tool for the traction clutch plate.

The PTO plate (if used) is loose (unlike the other plate), and can be aligned with the splines by turning the engine over by hand while carefully pushing the tractor together by hand.

DO NOT draw the tractor together will the bolts. You will destroy one or both of the clutch plates.

If the tractor has a PTO, there is an oddball seal between the end of the hollow PTO drive shaft and the pilot shaft. Replace that, too.

Also, be sure to note the orientation of the traction clutch plate. The splined center hub is offset, and the plate needs to go back in the right way.

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