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John Deere Tractors Discussion Forum
Show Parts for Model:

Re: 4020 hydraulic problem with loader

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Tx Jim

03-15-2013 04:06:59
67.142.163.25



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Without being there to diagnose the hyd's my first thought is faulty hyd 3 spool valve. Is the new hyd 3 spool valve one of the convertible types(open to closed/vice-verse)?? 4020 hyd psi should remain relatively the same whether raising or lowering the boom. With return hose disconnected from tractor(aimed in hyd oil filler hole) all levers on 3 spool valve in neutral and engine running does any oil flow out hose?? Hyd pump "if getting good flow from trans pump" has either some faulty inlet/outlet valves or stroke control valve to only attain 1900 psi stand-by pressure.

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belaw

03-15-2013 18:56:46
166.137.156.21



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 Re: 4020 hydraulic problem with loader in reply to Tx Jim, 03-15-2013 04:06:59  
Quoting Removed, click Modern View to see

Minor hijack, but does flow from the return line indicate an open center valve?



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Roger in Iowa

03-15-2013 19:02:19
166.181.81.102



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 Re: 4020 hydraulic problem with loader in reply to belaw, 03-15-2013 18:56:46  
No problem on the high jack. A true closed center valve will not have any flow in the return to sump line when no functions are being used.

An open center system has flow all the time and is interrupted during use, except for oil returning from the other side of a cylinder/or motor.



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Roger in Iowa

03-15-2013 07:04:21
166.181.81.120



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 Re: 4020 hydraulic problem with loader in reply to Tx Jim, 03-15-2013 04:06:59  
Both the original three spool valve and the new one are/were convertible. Problem occurred with the old valve too.

I am thinking there is something wrong with the tractor side of things.

Would a clogged or partially clogged filter or screen do something like this. Why would you have to feather the valve it it work okay, except for down. When moved to full stroke of valve the hydraulics DIE. Like something is telling the front pump not to pump at all.

When at 1900 standby the front pump does go quiet.

Thanks for any input/help. Will remove return hose and check for flow, but do not believe there is any as front pump goes quiet.

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Tx Jim

03-15-2013 09:15:40
67.142.163.22



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 Re: 4020 hydraulic problem with loader in reply to Roger in Iowa, 03-15-2013 07:04:21  
Quoting Removed, click Modern View to see

Removing the return hose as I previously outlined will establish if valve has closed center plug installed correctly. Have you thought about plumbing loader valve into another tractor with closed center hyd's to determine if hyd problem persists??



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Roger in Iowa

03-15-2013 10:32:26
166.181.81.120



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 Re: 4020 hydraulic problem with loader in reply to Tx Jim, 03-15-2013 09:15:40  
No. Unfortunately hind site is 20/20. Harder to do now since plumbing is hard wired so to speak.

Thanks.



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