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John Deere Tractors Discussion Forum
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1940 B

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B Bob

09-16-2007 20:22:41




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When I CAN get it started, at higher RPM's the whole tractor vibrates and isn't running smooth but all is well at low idle. Could timing be an issue? Doesn't start as easy as it should but there is no backfiring. Has old plugs, needs new plug wires and will be replacing this week. Carb could use a good cleaning too but am just wondering if any of the above could cause the shaking. Flywheel is tight - could the pulley/clutch be a culprit?
Thanks,Bob

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B Bob

09-22-2007 20:24:54




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 Re: 1940 B Follow-up in reply to B Bob, 09-16-2007 20:22:41  
Have found the rivet on the drive disc is not aligned on the flat spot on the crank. Could that be causing the shaking?



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greenmech

09-25-2007 20:01:36




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 Re: 1940 B Follow-up in reply to B Bob, 09-22-2007 20:24:54  
Yes if your driver is of a spline or more it will shake. Move it to the right place and let us know if its better. Ron Mn.



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B Bob

09-28-2007 01:35:50




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 Re: 1940 B Follow-up in reply to greenmech, 09-25-2007 20:01:36  
It was off by 180 degrees. However, the disc is cracked - if anyone has one for sale, please let me know (B1304R). Thanks for all the input.



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greenmech

09-17-2007 20:06:23




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 Re: 1940 B in reply to B Bob, 09-16-2007 20:22:41  
I would also check the flywheel timing along with the clutch driver. Both would cause vibration. Ron Mn.



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James Borders

09-17-2007 04:12:43




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 Re: 1940 B in reply to B Bob, 09-16-2007 20:22:41  
Check the position of the clutch driver. It has to be on right because it balances the unit out .



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B Bob

09-17-2007 04:23:26




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 Re: 1940 B in reply to James Borders, 09-17-2007 04:12:43  
That would make sense as the worst shimmy appears to be on the right side. Am going to go into the pulley this week - hopefully it's that and not something in the engine. Thanks



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johns48jdb

09-17-2007 03:48:09




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 Re: 1940 B in reply to B Bob, 09-16-2007 20:22:41  
you need to start by draining the old gas out and giving the carb a good cleaning. don"t think that will help the vibration. be sure your air way is clear. remove the boot in front of the carb while its running and see if that helps any.



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wendell minnesota

09-17-2007 01:52:35




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 Re: 1940 B in reply to B Bob, 09-16-2007 20:22:41  
Did this problem just start out of the blue??? When I was young and knew everything, I replaced the clutch plates on my dads 530. When I put it back together, I put the drive disc in the clutch not on the timing marks. It idled OK, but when I sped up, it was like riding on a jack hammer. My Dad talks about the first time he ever saw a B JD. It was at the county fair, running, each wheel on top of a coke bottle. The theme was how smooth the B runs. Good Luck

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B Bob

09-17-2007 02:35:54




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 Re: 1940 B in reply to wendell minnesota, 09-17-2007 01:52:35  
Don't know how long it has been like this as I just acquired it. Hasn't been run much in the last year or two. Thanks



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RobMD

09-17-2007 08:08:29




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 Re: 1940 B in reply to B Bob, 09-17-2007 02:35:54  
Bob, i want you to see if you can pick the belt pulley up and down for any play in the bearing. You may need a new pulley bearing.

Check that driver too.



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B Bob

09-17-2007 08:15:56




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 Re: 1940 B in reply to RobMD, 09-17-2007 08:08:29  
Rob:
Yes there is some slop/play in the pulley which leads me to believe that could be part of the problem. I appreciate everyones input.....this could be a dangerous situation with any loose or worn parts in there.



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