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John Deere Tractors Discussion Forum

70 Flywheel

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Andrus

05-29-2005 16:05:23

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Guys, I've gotten myself into a mess. The flywheel on my 70 was cracked,...someone had over tightened it, probably because it was "chucking" on the crankshaft. So I bought a new taper-lock flywheel and in my eagerness to put it on I didn't do much to the splines on the crankshaft...just hit them quickly with a file to take off a few obvious burs. Then I did as instructed, put the hub on first,...it went hard and I had to tap it to get it all the way on. Then I put the flywheel on and did as they suggest,...block the pulley side of the crank and bump the flywheel with a sledge hammer, tighten the nut and bump again. I did this for about half an hour until it would go no further,...but it still needs to go about 3/8",...the cover won't even fit over it. And now it's really on there. I tried taking it off in the way suggested,...back the nut off and bump it with the sledge and the flywheel's supposed to "jump off" the hub. Yeah right. Has anybody else had this problem and what can I do? Thanks.

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720Deere

05-29-2005 18:31:30

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Re: 70 Flywheel in reply to Andrus, 05-29-2005 16:05:23

Andrus,

That is not uncommon with a taperlock flywheel. 3/8" is exactly what dad's 720 was off. We took off the hub and had 1/4" machined off the inside of it. You will have to shorten the oil slinger pin as well.

If the flywheel has not jumped loose yet, you haven't applied enough force. I put a piece of 1/2" plate over the nut and gave it a good what for with a 10 lb sledge. I tried to go easy but it wouldn't budge until I got aggressive. You will see it literally jump out to meet the nut and at that point it will slide right off. You will need a puller to remove the hub, but that's not bad either.

Once we got the hub machined we reinstalled it and set the endplay. Then we lubed the hub taper and the inside of the flywheel and reinstalled the flywheel. We tried with no lube first and after the 1/4" machining we still gained nothing. Dad was skeptical about the lube, but that flywheel is keyed and as long as the big nut stays tight it can't go anywhere. Once lubed we were able to get it on far enough to clear the flywheel cover without shimming it.

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Andrus

05-30-2005 14:36:28

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Re: 70 Flywheel...sucess in reply to 720Deere, 05-29-2005 18:31:30

Hey 720 Deere you were right! I put a steel plate on the end of the crank and gave it a good whack and it did indeed jump off. So now I'll get that inner hub milled back 1/4" and I'm expecting sucess. Thanks.

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Earl -IL

05-29-2005 17:29:54

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Re: 70 Flywheel in reply to Andrus, 05-29-2005 16:05:23

Did you have the flywheel all the way on and was the crankshaft endplay right .010-.015 If that is Ok .They fail to tell you the square nut will hit the cover most of the time. If you will look back in the past post you will find the cure. Earl

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