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720 flywheel

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arnie1968

03-17-2003 10:23:37




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Hi I have a 720d with a taper lock flywheel on it.
My problem is that I have a considerable amount of side to side movement oy the crankshaft. How would I get rid of this movement? It is probably a 1/21 to 3/4 of and inch.

Thanks




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Clooney

03-17-2003 15:00:38




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 Re: 720 flywheel in reply to arnie1968, 03-17-2003 10:23:37  
Arnie, what is the S/N on your 720D. On the early ones or at least the 720D's with the early crank & flywheel spacer the crankshaft end play is controlled by the outer thrust washer stack height & setting the crankshaft end play on those is a pain & involves measuring the end play then removing the flywheel & spacer then varying the thrust washer stack height. ~On the later 720D's or the early tractors that have been upgraded to the later thrust set up, the flywheel position on the crankshaft controls the crankshaft end play & as stated below all you have to do is move the flywheel on the crank splines [ain't that easy with a taper-lock flywheel though].
~The thrust washers MUST be there & in good condition & any time on a 2-cylinder diesel the crankshaft end play becomes excessive it is in your best interest to pull it apart & make sure the inner & outer thrust washers are there & not worn or broken. It's a big job to inspect that inner thrust washer but becomes VERY EXPENSIVE if you don't & it's missing or broken.....

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arnie1968

03-18-2003 10:08:16




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 Re: Re: 720 flywheel in reply to Clooney , 03-17-2003 15:00:38  
sn#7216077
How do you support the flywheel when removing? There are no holes in this one
How much do they weigh? any idea
It looks as the flywheel is in as far as it can go without rubbing on side of housing.

Thanks



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Clooney

03-18-2003 12:47:52




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 Re: Re: Re: 720 flywheel in reply to arnie1968, 03-18-2003 10:08:16  
Arnie, while I haven't ever weighed one it has to be every bit of 150# & possibly even more. In my younger days I have lifted those diesel flywheels off by hand but even if the weight doesn't get you those sharp ring gear teeth will. ~If you have any holes at all you can bolt on a piece of steel & lift it off with that. If no holes at all you can use a floor jack [use 2 people for safety sake] to hold it up then pull it away from the crankshaft. You might even want to drill & tap a hole in it to have as a lifting point...

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F-I-T

03-18-2003 10:35:22




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 Re: Re: Re: 720 flywheel in reply to arnie1968, 03-18-2003 10:08:16  
third party image

Arnie:

There should be two - 1 1/2" or so "holes" in the flywheel that you can loop an old v-belt through.

I like to use an engine hoist for flywheels on 70's and the like. I used to pick those up on "A"'s and such, but a 70 flywheel is well over 150 lbs I'd think. Plus, my back got weaker as my mind got stronger (though there are those that would debate that)....

I keep an old timing belt around for such tasks. Nice and flat and easy to push through those holes.

The JD manual shows a device that looks like ice tongs. They would work if you could find a set.

Frank-in-Tallahassee
70D // 855

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arnie1968

03-18-2003 10:57:37




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 Re: Re: Re: Re: 720 flywheel in reply to F-I-T, 03-18-2003 10:35:22  
On my other 720's, the stock flywheel does have the holes you talk about, but this one is different. It is an aftermarket. No holes at all.



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F-I-T

03-18-2003 12:54:36




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 Re: Re: Re: Re: Re: 720 flywheel in reply to arnie1968, 03-18-2003 10:57:37  
Well, Arnie, I guess that might be one of those complete aftermarket flywheels that are poured steel ? I've heard about them, just never saw one. An ice tong grabber would be one way to go, or use a floor jack with help as Clooney suggested.

Frank



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Ted K

03-17-2003 11:10:57




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 Re: 720 flywheel in reply to arnie1968, 03-17-2003 10:23:37  
Could just be that you need to drive the flywheel onto the crankshaft farther, OR the thrust washer has gone bye-bye and needs to be replaced. (SN-7214900 and up) On earlier tractors there are shims between the thrust cover and the timing gear housing.



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G-MAN

03-17-2003 11:01:57




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 Re: 720 flywheel in reply to arnie1968, 03-17-2003 10:23:37  
I'm not familiar with the taper-lock flywheels, but the crank endplay on a two-cylinder is controlled by the position of the flywheel on the crankshaft. You need to get the flywheel slid on farther. Endplay should probably be .005" to .010". Excessive endplay will damage the main bearings.



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