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Tractor Talk Discussion Forum

JD guys arent answering question...

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Joe in OKC

12-06-2006 09:41:54




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Hi, I posted this on the JohnDeere board, but only 2 people replied and they didnt answer the questions - maybe posing here can help... I've got a JD 520 that doesnt run (havent had time to play wih it)- every few months, I turn the flywheel to keep the tractor loose. standin looking at the flywheel, I can turn it counterclockwise by hand and go round and round real esay. But I cant turn it clockwise exept for maybe 1/10th of revolution, then it gets stuck. ALways thought a person could turn them both ways? Is something tied up?
thanks for yer help, Joe

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Jon Hagen

12-06-2006 17:16:26




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 Re: JD guys arent answering question... in reply to Joe in OKC, 12-06-2006 09:41:54  
Is the 520 an updated 50 ? and when you say it did not start ? Did it crank with the starter but not run ?
If not maybe the starter armature is stuck. With the flywheel cover removed,the starter drive rod would have the starter drive in mesh with the flywheel,and if the starter was jammed,you could rotate the engine in the normal direction because the starter drive overrun clutch would allow it to turn in that direction. If you tried to turn it in the opposite direction with a jammed starter engaged,the starter drive overunning clutch would prevent rotation in that direction. A locked up starter may be the only thing wrong. Try tieing the starter rod up so it is disengaged from the flywheel and see if the engine will turn both directions.

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Glen in TX

12-06-2006 13:14:36




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 Re: JD guys arent answering question... in reply to Joe in OKC, 12-06-2006 09:41:54  
I agree with the others about checking the starter driver first. If it's not that pull the valve cover off and see if valves move or pull a plug and see if it has compression or pull engine cover and see what else you can see wrong inside engine? You never answered me if it was for sale either? A copy of a I&T JD-16 shop manual that covers the 520-730 might help you also.

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Jerry Cent. Mi.

12-06-2006 13:14:12




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 Re: JD guys arent answering question... in reply to Joe in OKC, 12-06-2006 09:41:54  
It might have spun a rod insert.



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las vegas

12-06-2006 12:24:23




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 Re: JD guys arent answering question... in reply to Joe in OKC, 12-06-2006 09:41:54  
mr. mjbrown here has posted the most obvious answer.. i had difficulty seeing which way the flywheel went from which side of the tractor!! So, according to his post and your post, it is working the correct way but not the opposite way. I"ve personally never bothered rolling a 2cyl BACKWARDS, so i do not know if they can go backwards or not.



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NEsota

12-06-2006 11:04:22




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 Re: JD guys arent answering question... in reply to Joe in OKC, 12-06-2006 09:41:54  
When I was 15, I bought a Model A Ford for $10. It had not run for a while and to loosen up the engine we pulled it with a tractor, not to start it but to loosen engine up. First I had it in hi gear, then second, then low and on into reverse. I was really going to loosen it up, it was then that it started sounding different. Problem was, teeth had sheared off the non metallic cam shaft gear. This, I attributed to the fact that the cam has a steeper angle on the back side than the front side and it required more torque to rotate it backwards. This may be what you are looking at. NEVER, try to turn an overhead cam engine backwards with the timing belt connected.

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Harlan Kruger

12-06-2006 10:23:16




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 Re: JD guys arent answering question... in reply to Joe in OKC, 12-06-2006 09:41:54  
My first thought that came to mind was the oil pump not turning correctly, I have parted out tractors and as I got them apart I could turn it over one way, and not the other, and it was because the oil pump shaft wasnt turning properly. Also, Perhaps there is a broken or damaged gear on the camshaft or governor gear that isnt allowing something to move correctly. These are just a few thoughts, When you have a tractor stipped down to just the crankcase, crank, flywheel and pulley, you can turn it either way easily forwards and backwards. Just a few thoughts. My 2c

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Mike M

12-06-2006 10:18:51




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 Re: JD guys arent answering question... in reply to Joe in OKC, 12-06-2006 09:41:54  
Your question WAS answered by me over at the JD board !

I said somethings not right. That means yours has something wrong. I'm sorry I don't have my crystal ball up and running to tell you exactly what is wrong. Your going to have to tear it apart to find it out.



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mjbrown

12-06-2006 10:13:51




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 Re: JD guys arent answering question... in reply to Joe in OKC, 12-06-2006 09:41:54  
Counter clock wise facing the flywheel is the correct direction, the direction it runs. Turning it that way is a good thing. Why you want it to go backwards is a mystery to me. It wasn't designed to go that way and there is probably a reason why it doesn't want to. I don't know what it is either. If it was mine I wouldn't try too hard to make it turn over backwards (clockwise) for fear I would screw something up.

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55 50

12-06-2006 11:44:26




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 Re: JD guys arent answering question... in reply to mjbrown, 12-06-2006 10:13:51  
Yours is the best (and the only correct) answer and I agree completely!!



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las vegas

12-06-2006 09:52:25




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 Re: JD guys arent answering question... in reply to Joe in OKC, 12-06-2006 09:41:54  
Take the plugs out. are you sure it isn"t compression? I honestly don"t see why it shouldn"t roll forwards with ease. Does it do it with clutch engaged or disengaged? is the starter interfereing with flywheel movement? Are you sure that the tractor hasn"t thrown a rod? Perhaps the oil pump is preventing it from rolling forward. Maybe the rings are broken in the piston. There is a lot of possibilities, but I would start with the simple outside stuff first and then dig in to find out whats wrong

ive honestly never heard of a 2 cylinder rolling backwards but not forward...indicates something broken to me

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Mike M

12-06-2006 10:48:49




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 Re: JD guys arent answering question... in reply to las vegas, 12-06-2006 09:52:25  
I think your on to something with that starter interferance ! If you have the fylwheel cover off and don't tie up the rod/lever for the starter the drive will catch and this may be all it is ?



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Glen in TX

12-06-2006 13:33:50




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 Re: JD guys arent answering question... in reply to Mike M, 12-06-2006 10:48:49  
Yeah I think that could be it and I thought of it before but figured he would have found it by now. I just wanted a 520 parts tractor close lol.



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