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JD A Shakes Bad
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Just Re-built

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Mike O

12-15-2002 15:04:29




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I'm in the process of shaking down a 48 A after a rebuild. The tractor seems to shake too much, especially at idle. It's bad enough that I have to hold onto the steering wheel so it doesn't shake itself off. Both the clutch drive disk and flywheel have been installed so the V's are in register. Any ideas on what might be causing this and how I can fix it.




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Dave K

12-16-2002 14:46:59




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 Re: JD A Shakes Bad - Just Re-built in reply to Mike O, 12-15-2002 15:04:29  
Not sure about the shakes except for either the flywheel or clutch assembly being off. On the fouling plugs I tried everything with my A and fouled plugs about as fast as I could clean them. Even had to change them out in the field every hour or so. Finally found the head gasket was burnt through between the two cyls, I guess allowing fuel in wrong and it was also running rough at the same time. New head gasket cured all.

Dave

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Ron Stephens

12-16-2002 05:05:17




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 Re: JD A Shakes Bad - Just Re-built in reply to Mike O, 12-15-2002 15:04:29  
My money is on the flywheel or clutch driver being out of time. I have run into two cases where the timing marks were off. One on the flywheel and the other was off on the end of the crank. The flywheel can be easily checked by lining up the left hand impluse timing mark. Number one piston should be at top dead center.



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Pappy

12-15-2002 20:53:42




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 Re: JD A Shakes Bad - Just Re-built in reply to Mike O, 12-15-2002 15:04:29  
We recently bought a "G" that shook badly, although it had been overhauled. Upon inspection, we found the flywheel properly installed, and the clutch driver was installed properly according to the register marks. Upon further checking, the clutch driver was about 90 degrees off. We ignored the marks and installed it with the weighted section opposite the #2 piston, and she sits and runs perfectly. Apparently, the clutch driver might have been replaced at some time. I don't know if all drivers and shafts are marked at the same spot or not when assembled as new.

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Gordon

12-15-2002 17:50:50




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 Re: JD A Shakes Bad - Just Re-built in reply to Mike O, 12-15-2002 15:04:29  
I would check the flywheel if it is on the right spline.



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Clooney

12-15-2002 15:24:36




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 Re: JD A Shakes Bad - Just Re-built in reply to Mike O, 12-15-2002 15:04:29  
Mike, give it a little break in time & see if it tames down a little after the initial stiffness goes away.
~Check the ignition timing & carb settings & if it still vibrates you probably have unbalanced pistons, or the flywheel or drive disk are incorrectly balanced. ~Does it get better or worse with the pulley engaged? Are both cylinders firing good? Did you replace the pistons? Usually an imbalance problem gets worse as the RPM's are increased, if it is just bad at idle & not so bad at higher RPM's it is probably a firing problem or stiff engine.

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Mike O - More info for you Clooney

12-15-2002 17:23:37




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 Re: Re: JD A Shakes Bad - Just Re-built in reply to Clooney, 12-15-2002 15:24:36  
The ignition timing should be right on as I just re-timed it per the book a few days ago. The carb was just rebuilt by Burrey Carb, and I've got the settings at 1-1/2 turn idle and 3/4 turn load. The rings are new but the pistons are not. Both cylinders are getting a good spark. The problem is a bit worse with the pulley engaged. I've only had the tractor running about 20 minutes so it's not even close to being broke in yet. What do you mean by unbalanced pistons and how is this corrected? Is there something else with the cylinder firing I should check besides the spark quality? Thanks for your help with this.

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Clooney

12-15-2002 17:49:01




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 Re: Re: Re: JD A Shakes Bad - Just Re-built in reply to Mike O - More info for you Clooney, 12-15-2002 17:23:37  
Mike, if you are using the same pistons you had before it shouldn't vibrate any more now than it did before the rebuild.
~If it's worse with the pulley spinning, make sure the pulley bushing & bearing aren't worn & allowing the pulley to spin off center.
~Give it some more break-in time then see where you are at.
~Probably wouldn't hurt to check the tire air pressure as low tires can contribute to shake. Make sure all the frame bolts are tight also. ~Maybe it is just a firing pulse shake & not a vibration. Does it get worse as the engine RPM is increased? Is it a shudder type vibration or a more pronounced hopping type of shake.

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Mike O

12-15-2002 18:11:34




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 Re: Re: Re: Re: JD A Shakes Bad - Just Re-built in reply to Clooney, 12-15-2002 17:49:01  
I can't tell you if the tractor vibrates the same now as it did before the rebuild as this is the first time it's ran in about 25 years. The shaking seems to be more side to side than hopping - a shaking back and forth type of movement. I think I'll just give it some more break-in time and see how it's running after a few more hours. I have noticed that the plugs are fouling real fast. Could this be pointing to a problem that is also causing the 'shakes'?

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firedog

12-15-2002 19:09:57




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 Re: Re: Re: Re: Re: JD A Shakes Bad - Just Re-built in reply to Mike O, 12-15-2002 18:11:34  
Did you replace or check the main bearings and crank during the rebuild? This is something that could cause the old girl to jump and dance. It shouldn't be doing this.



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