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flywheel 4020

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Clay

12-21-2003 21:56:14

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I am going to be replacing a flywheel on a 4020...Is there any special tools or precautions I may need to know..... .I have been an auto mechanic for 22yrs. This will be my first tractor

Thanks for any info..... ..

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Brokenwrench

12-22-2003 15:48:15

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Re: flywheel 4020 in reply to Clay , 12-21-2003 21:56:14

Why are you replacing the flywheel? Unless it is cracked or the bolt holes elongated,the flywheel can be machined(both the friction face and mounting flange for the pressure plate). If you have never done one before,at least buy an I&T manual.All 6 clutch fingers have to be set before installation,and you have 2 clutch discs to get lined up. You have to drain the coolant,unhook some hydraulic lines,unhook the wiring harnesses,tachometer cable,ether aid etc. Make sure you have suitable support devices at hand,both for the front end and trans. Its not a bad job if you are familiar with heavy equipment,but its not like putting a clutch in a car or pickup.

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Heat Houser

12-22-2003 14:51:21

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Re: flywheel 4020 in reply to Clay , 12-21-2003 21:56:14

I would recommend new flywheel bolts. New bolts have a patch of loctite on them to prevent them from backing out. At the very least, I would install the old bolts using Loctite. If you don't have the special tool to set up the clutch fingers, take the whole assembly (both flywheel and clutch) to a JD dealer and have them set them up. You can then install the stuff back onto your tractor and it will already be ajusted.

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Jailkeeper

12-22-2003 12:51:20

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Re: flywheel 4020 in reply to Clay , 12-21-2003 21:56:14

Check the trans. input shaft for a burr on the front of it. They have been known to get longer and the shaft will actually fit up against the crankshaft causing the trans. to turn even when the clutch is disengaged. You can grind off the end of the input shaft if needed. If you install a new clutch assy., there is usually a small wooden disc - it goes between the crank and input shaft.

A service manual would be a big help in getting the clutches adjusted correctly during assembly.

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Fred OH

12-22-2003 10:39:04

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Re: flywheel 4020 in reply to Clay , 12-21-2003 21:56:14

I once was called to a John Deere repair shop and they had split a big JD (don't remember the model) but they were kinda nervous about the fact that all the bolts in the crankshaft holding the flywheel were sheared off (flush) and stated that a new crank cost $1800...and their other tractor was down too and right in the middle of crops. Wanted to know if I (as a machinist) could do anything with it...as the owner looked on...I found a prick punch and small hammer and within 30 minutes had them all removed. Big relief to owner...only had to buy new flywheel and 6 or 8 bolts...a great big smile and a fifty dollar bill took care of the rest of the deal. He was a friend...so I took the money...you make money off of your friends cause your enemies don't come around...right? You know, if I'd thought about it at the time...I wonder what their reaction would have been if I'd offered them the loan of a 53 year old TO-20 Ferguson or a MF-35...they had all John Deere equipment. They'd probably said bring them out tonight...after dark. Fred OH

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Dale in IN

12-22-2003 08:51:29

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Re: flywheel 4020 in reply to Clay , 12-21-2003 21:56:14

Be very carful those clutches and fly wheel weigh 75 Lbs. Your alignment tool needs 2 steps on it to line up both clutch plates. I made one of a 2*4 in the lathe. If you are going to replace the throw out bearing. you may have to cut a notch in the boss inside of the clutch housing To get it out. This saves splitting it twice. If you are in need of a new clutch disk I have a brand new 5 Pad high tork that I would sell.

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Bob

12-22-2003 08:21:34

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Re: flywheel 4020 in reply to Clay , 12-21-2003 21:56:14

Synchro Range tranny, I suppose?

You'll need a gauge to set up the clutch fingers.

There are 6 of them, if the tractor has a PTO... 3 for the foot clutch and 3 for the PTO clutch.

The gauge is a flat metal plate with various ledges on it to match up with the appropriate clutch finger.

I believe some of the older I&T manuals had a drawing of the gauge, otherwise, you'll have to borrow one to do an accurate job.

You'll need a clutch alignment tool, or old tranny input shaft to align the foot clutch splines.

If it is a PTO tractor there are 2 ways to align the PTO plate.

1. Use an alignment tool to align the PTO plate, as you would on a car, then tap wooden wedges under the PTO clutch fingers, in such a way as to hold the PTO fingers depressed, which holds the plate in position as you've aligned it. After the tractor has been CAREFULLY rolled back together, you knock the wooden wedges out, working from the bottom, through the access hole.

2. It also works to just VERY CAREFULLY roll the tractor back together, and have a helper rotate the back PTO shaft until it aligns the plate.

(As you may realize, the PTO clutch works opposite of automotive clutches, in that the clutch is ENGAGED by the continuous force of the throwout bearing aginst the clutch fingers.)

Just curious... what happened to the old flywheel?

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jd boy

12-23-2003 21:17:12

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Re: Re: flywheel 4020 in reply to Bob, 12-22-2003 08:21:34

brother and i put a new clutch in his 4010 diesel. had both surfaces of flywheel resurfaced and then had a friend(old jd mechanic) rebuild and adjust clutch on the flywheel. we marked everything before removing new clutch..beware of the flywhel...looks like the came out of a caterpillar!!

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