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Combines & Harvesters Discussion Forum

Jd 4400 combine hydraulic problems

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Dale6

06-02-2014 16:11:50
162.72.219.59



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I recently purchased a JD 4400 combine and am having trouble with lowering the feederhouse. It will raise real easy and fast but it will not lower. I took the valve off from under the cab and took it apart cleaned it and put in new seals. I noticed yesterday when I had a head on it that when I was raising and lowering it it would raise it fine and when I would lower it, it would go down but it done a lot of jerking. I am new to the combine buisness so any help you guys could give would be greatly appreciated.

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andy r

06-03-2014 19:48:02
75.91.149.15



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 Re: Jd 4400 combine hydraulic problems in reply to Dale6, 06-02-2014 16:11:50  
My JD 4420 will raise the head at idle, but will not let the head lower until the engine rpm is increased. I think it is a safety procedure so the head doesn't drop on someone working on the combine when it is idling. At a certain point when the engine rpm has been increased, but the rpm still isn't as high as it should be the head will sort of jerk going down. I am not sure as to how it works.

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LonM

06-02-2014 16:44:16
69.165.30.148



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 Re: Jd 4400 combine hydraulic problems in reply to Dale6, 06-02-2014 16:11:50  
With our 4400 we always had to rev up the engine to get it to lower a head or the feeder house at a decent rate. I am not sure why it was like that. Our 4420 seems to be a little better, but not great.
Lon



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