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Combines & Harvesters Discussion Forum

Re: early jd 4400 cylinder tach

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JD Seller

06-26-2013 22:52:57
208.126.196.144



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Check and see if the cylinder tack drive oring (# 9, part # H83078,in the picture, List $13.60)is still there. I would bet that it is broken. They only last a year or so.

They are driven off of the over beater on the right side of the combine. The over beater is driven by a small belt that is behind the main cylinder drive belt. The over beater has a small plastic pulley on it. Then above it is the cylinder tack drive. It has a smaller pulley on it. The belt/oring gets just stretched on with a half twist in it.

You can check to see if the tack/cable is good by spinning it with your finger. Some one watching in the cab will be able to see the cylinder tach bounce when you turn it by hand. This pulley goes the opposite rotation than the cylinder.

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Mike Aylward

06-27-2013 06:38:27
209.152.135.126



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 Re: early jd 4400 cylinder tach in reply to JD Seller, 06-26-2013 22:52:57  
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
208.126.196.144



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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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