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Tractor Talk Discussion Forum

Installing Clutch in 4020 JD

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Grail

04-15-2005 22:01:02




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The tractor is 1966 or 67 model. I know you have to seperate the tractor in the middle. What do you use to balance each half while working on the clutch? It has a front end loader on it. Can this be used to help balance the front section?




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jdemaris

04-16-2005 20:43:40




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 Re: Installing Clutch in 4020 JD in reply to Grail, 04-15-2005 22:01:02  
I carried splitting stands with me when I was a field mechanic for Deere - but rarely used them. You can stick a good foor jack under the front half of the tractor and hammer some wood shims on both sides of the front axle pivot - just as Bob mentioned in his post. So,the front half with engine is the part you wheel way when splitting. The rear half can be held up by bottle jacks and some wood blocks for insurance. One jack in front, and one in back under the drawbar. When you're putting it back together, and if you're by yourself, put two come-alongs on the two halfs - one on each side. Pull them back together that way - but do not force anything. When shafts come in contact with the clutch disks - rock things back and forth, rotate the engine, rock the PTO shaft, etc. until with slight tension from the come-alongs - it almost falls together. If you have a SynchroRange style PTO clutch - put some wood shims to hold the pressure-plate fingers in to the PTO clutch disk will stay in place.

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Mike M

04-16-2005 14:29:59




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 Re: Installing Clutch in 4020 JD in reply to Grail, 04-15-2005 22:01:02  
Everybody covered most bases,but I have a 158 JD loader on our 4020 and I split it with the loader on. I didn't find it that much in the way. I don't know what loader you have you may or may not have to remove it.



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mecanik69

04-16-2005 08:55:21




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 Re: Installing Clutch in 4020 JD in reply to Grail, 04-15-2005 22:01:02  
Not too bad of a job. Take off loader. As far as holding up front end, just take channel iron and bolt it with two bolts on each side of frame rails and have aflat welded to bottom of channel at the floor. Also crib under engine so you can put a bottle jack between cribbing and oil pan to raise and lower for reassembly. For the back a floor jack under the hitch in center of rear end,and pull the back end away. I have done this many times,splitting stands are nice but notnecessary for this relatively simple task.As far as clutch gauge you can buy one from deere or borrow one from dealer. Service manual will aid in setting clutch. As far as the flywheel do not have it surfaced unless there are major heat cracks or gouges. Remember every time you cut flywheel you lose clutch life.Have fun.

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Bob

04-16-2005 12:00:20




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 Re: Installing Clutch in 4020 JD in reply to mecanik69, 04-16-2005 08:55:21  
I find the statement that "you will loose clutch life by resurfacing the flywheel" a bit strange, to say the least!



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mecanik69

04-16-2005 23:58:15




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 Re: Installing Clutch in 4020 JD in reply to Bob, 04-16-2005 12:00:20  
To Bob on 4020 clutch life. If you take away the surface of the flywheel the clutch and pressure plate are that much farther away from throwout! If you do not like my theory I suggest you talk to Spicer or Eaton as I have attended seminars on this topic many times. As I was also informed you want to install a new clutch verses a rebuilt because new is new and rebuilt is just inspected for bad parts and put back together with what it needs.I have installed many rebuilts but found better life with new, and not cutting flwwheel.Just what I have learned from many years of trial & error and a little listening from peers.

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the tractor vet

04-16-2005 07:02:45




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 Re: Installing Clutch in 4020 JD in reply to Grail, 04-15-2005 22:01:02  
Splitting stand , jack stand floor jack. And also the clutch set up tool , And have fun.



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TomTX

04-16-2005 05:40:10




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 Re: Installing Clutch in 4020 JD in reply to Grail, 04-15-2005 22:01:02  
Suggest you post on John Deere forum.
Suggest you get real JD Repair Manual.
Suggest you search the JD fourm archives.



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SC Bob

04-15-2005 23:15:24




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 Re: Installing Clutch in 4020 JD in reply to Grail, 04-15-2005 22:01:02  
Also don't force the halves of the tractor back together as it can brake the pump in the rear end that furnishes oil to the main hydraulic pump in the front of the tractor.I saw it done once by another dealer when I was working for a JD dealer in New York back in the early 70S



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big jt

04-15-2005 22:34:50




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 Re: Installing Clutch in 4020 JD in reply to Grail, 04-15-2005 22:01:02  
You will need a set of splitting stands. I know OTC used to sell a set specifically for that tractor. Most guys adapted them in future years to fit other tractors as the need arose.

Alternitively if you intend to do much work on tractors I would suggest maybe making a set. I did this a couple of years ago used them once so far but know I will use them again. Main thing is to have the front half so the wheels that support the stand are of wide enough stance that all is stable. Also you will need a fine adjustment for height on both halves so you can get everything lined up when going back together.

Forget about the loader more to the point take it off before doing this job. There are some hydraulic lines at the frame level that are probably under the loader brackets and typically the front half is what is moved away from the back.

Setting up the clutch on a New Generation and Next Gen Deere takes a special jig. I think something could maybe be jury rigged but not sure. Maybe somebody with more experience here will shed more light.

Most Important get a shop manual!!!! Don't know whether I&T will give you what you need. I have a Deere so I know mine shows the procedure.

If this is the only major tractor work you intend to do hire the job done. To much equipment to buy/build for just a one time deal.

HTH

jt

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Bob

04-15-2005 22:51:46




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 Re: Installing Clutch in 4020 JD in reply to big jt, 04-15-2005 22:34:50  
You can borrow a jig to set up the clutch, or take the complete flywheel and clutch assembly to a Deere shop to have the fingers set, and then reinstall it on the tractor.



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Bob

04-15-2005 22:24:47




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 Re: Installing Clutch in 4020 JD in reply to Grail, 04-15-2005 22:01:02  
Leaving the loader on will make it MISERABLE to work on.

Wedge between both sides of the front axle and the frame rails, so the front assembly can't rock from side to side on the axle pivot. Securely crib up a support under the back of the engine. Then you can use a heavy-duty floor jack to roll the rear half back away from the engine.

Be carefull, and support everything at least twice as well as it looks like you'd need to!

Of course, having a set of splitting stands from a defunct Deere dealer makes the job a bit easier!

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