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JD720

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Dennis Ferrell

04-10-2000 17:36:49




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Help!!!will a 820 crank fit into a 720 case with clearence? #2-will a 820 case bolt to a 720 rearend? #3-will a powertrol 3 point lift system from a 720 fit a 820 or 830? #4-what is the differences between 720 engine and 830 engine other than the stroke? #5-what would be the results of turning the engine speed up to 1400 rpm-what would be the prolonged damage?

Thanks in advance
Dennis Ferrell

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Jeff H

04-11-2000 10:17:48




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 Re: JD720 in reply to Dennis Ferrell, 04-10-2000 17:36:49  
Don't think the two will interchange but never bee around a 820. It is a much bigger machine. Can tell you that turning up RPM will break the bottoms of the pistons off from the last ring back, and they will wind up in the bottom of the crankcase. Have been a witness second hand to that.



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Jeff H

04-12-2000 17:55:16




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 Re: Re: JD720 in reply to Jeff H, 04-11-2000 10:17:48  
Thanks for the info-I forgot to say that it is a diesel. Trying to find info to if the crank will rotate in the 720 case. If not can it be machined clearned in the case? So you had the opportunity to see it first hand? Did you see $$$$$$$ flying away?

Dennis Ferrell



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Jeff H

04-15-2000 18:47:50




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 Re: Re: Re: JD720 in reply to Jeff H, 04-12-2000 17:55:16  
No actually it was a friend of mine's tractor. Tore it down for a rebuild and the back of the No. 1 piston was gone. Talked to an old JD mechanic about why this happened and he told the story about "racing" his brother thru the field plowing by opening up governor and took the bottoms off both of his piston. My buddy said his had over revved some but it had been several years in the past. The tractor had actually ran that way for about eight years!!! Didn't hurt the cylinder wall at all. Never figured out how he kept from doing that either. Later.

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Jeff H

04-15-2000 18:49:44




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 Re: Re: Re: Re: JD720 in reply to Jeff H , 04-15-2000 18:47:50  
By the way we found all of the broken piston in the bottom of the crank but never did find all of the ring that was with it.



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