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John Deere Tractors Discussion Forum
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4620 hydraulics

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as

03-30-2005 10:45:52




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Question about my hydraulics. The number 1 remote either does not raise my implement at all or sometimes it raises very slow. The number 2 works just fine. I just changed the filter, but it did not make any difference. The oil level is OK. I am trying to use a field cultivator. I need one remote to unfold and the other to raise and lower. Anyone have any ideas as to where the problem is?




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G/MAN

03-30-2005 11:00:47




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 Re: 4620 hydraulics in reply to as, 03-30-2005 10:45:52  
If your #2 remote works well and #1 doesn't, that pretty much isolates exactly where the problem lies, but you already knew that. More than likely, it's an internal problem in the valve. I'd check the linkage adjustment, and make sure that the hand-lever and linkage are moving the arm on the SCV correctly. There are three cams located in the valve that operate 4 spool valves to control the pressure and return oil flow. The other cam keeps the lever in the detent position for continuous operation. You could have a faulty spool or internal leak. And although I've never seen it happen personally, the roll-pin that secures the cam carrier to the arm might be sheared. You could have the unit flow-tested to determine what's happening inside, but it's probably easier just to remove the box and take it to your JD dealer or someone familiar with them. If you have to rebuild the top of the box, the spool seats will need to be ground, etc. Nothing terribly difficult with the right tools, but much easier once you've done a few.

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JDBert

03-30-2005 10:56:37




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 Re: 4620 hydraulics in reply to as, 03-30-2005 10:45:52  
check to see were your flow valve is at, I would also check to see if your linkages are operating the valve correctly.



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