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Combines & Harvesters Discussion Forum

Re: early jd 4400 cylinder tach

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Mike Aylward

06-27-2013 06:38:27

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JD, you mentioned the o-ring having a half twist in it. I used to have a 4400 and a 7720. One of them had a half twist in it and the other didn't. For some reason I'm thinking the 4400 went on straight and the 7720 had the twist. I'm relying on memory here. Refresh it, please..:) Mike

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JD Seller

06-27-2013 10:47:34

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 Re: early jd 4400 cylinder tach in reply to Mike Aylward, 06-27-2013 06:38:27  
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Mike your are correct that some do not have the twist in them. I do not remember 100% either. He can find out real easy as long as he knows some have the twist.

The cylinder tach is handy to have working but in Wheat your run a JD cylinder speed as fast as it will go. They do not have a very fast "HIGH" speed.
Then clean the rock trap out and close the concave down as close as you can get it without it hitting the cylinder bars.
IF he does that the cylinder is set. Then it is just the sieve, chaffer, and air to set.
Wheat is easy to get set for most of the time.

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