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John Deere Tractors Discussion Forum
Show Parts for Model:

3020 hydraulics

Author  [Modern View]
Dennis430

12-12-2013 15:20:58
70.197.213.52



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I have two issues which may be connected. Background: it"s 13 degrees here (MN). The hydraulic fluid is at the correct level.
1. 46A loader will keep going up even if lever is released to the neutral position. The bucket isn't affected. It usually happens if I lift the loader and want it to stop-it keeps going up. It has happened a few times when warm, but today it was constant.
2. The lever for the back blade was stuck (locked) in the down position and would not release. That is the first time this has happened. I pulled off the cowling and gave the pivot points a little WD40. Tapped it with a hammer and the bottom of the lever broke off. I really didn't hit it that hard.

Thanks in advance for your help.

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NY 986

12-13-2013 18:48:18
67.142.182.22



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 Re: 3020 hydraulics in reply to Dennis430, 12-12-2013 15:20:58  
In regards to your loader issue the remote it is plugged into has valve issues. Chances are the spool needs to be replaced. Going from cast to stainless from the 10 series to the 20 series in the forward or dash mount controls minimized pitting but did not eliminate it. If you have a dash type control and go for a used spool/ valve make sure it is out of a 20 series tractor.



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buickanddeere

12-13-2013 19:16:58
209.240.119.130



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 Re: 3020 hydraulics in reply to NY 986, 12-13-2013 18:48:18  
Instead of re-working/rebuilding/replacing the dash hydraulic valves on an early tractor? Could it be simpler and more cost effective to install a standard joystick loader control for the loader boom & bucket? There is no mention of a cab to complicate the installation.



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NY 986

12-14-2013 06:17:49
67.142.182.20



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 Re: 3020 hydraulics in reply to buickanddeere, 12-13-2013 19:16:58  
Yeah, but he may want to square that remote away for when it is used on other jobs where he does not want the cylinder to move once set.



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buickanddeere

12-14-2013 07:48:44
209.240.119.130



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 Re: 3020 hydraulics in reply to NY 986, 12-14-2013 06:17:49  
I'm not sure what you are getting at. Who would supply a joysticks from a worn out rear scv and tie it up? When a couple simple T's will connect the joystick. Which leaves the scv's open for other implements. And don't incur the cost or rebuilding old scv valves or worn scv couplers.
This post was edited by buickanddeere at 07:50:08 12/14/13.



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NY 986

12-14-2013 08:01:49
67.142.182.22



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 Re: 3020 hydraulics in reply to buickanddeere, 12-14-2013 07:48:44  
Quite simply if the tractor is used on other implements and uses that remote circuit there is the possibility of the cylinder creeping unintentionally. It happened on our 4010 running a 347 baler that had hydraulic hitch shift and positioning of the 30 ejector. It has nothing to do with the joystick you are talking about.



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buickanddeere

12-14-2013 08:54:01
209.240.119.130



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 Re: 3020 hydraulics in reply to NY 986, 12-14-2013 08:01:49  
What cylinder creeping unintentionally? The loader is controlled via the joystick. Implements on the scv's have nothing to do the the loader circuit.



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buickanddeere

12-12-2013 16:34:57
209.240.119.130



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 Re: 3020 hydraulics in reply to Dennis430, 12-12-2013 15:20:58  
Loader works better on it's own joystick. With the oil supply tapped into the line supplying the SCV's. The rear scv's are best left for lifting cultivators. The loader oil returned to the transmission filter via the rockshaft oil return line. Or a ported filter cover.



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Dennis430

12-12-2013 17:07:11
70.197.213.52



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 Re: 3020 hydraulics in reply to buickanddeere, 12-12-2013 16:34:57  
Over my head; is there a filter I should change? It sounds like need a new cable for the rear hydraulics,



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Tx Jim

12-13-2013 04:39:21
69.35.163.56



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 Re: 3020 hydraulics in reply to Dennis430, 12-12-2013 17:07:11  


If I'm understanding you correctly the loader is operated from the rear hyd breakaway couplers??

Hyd filter is on LH side under battery, Screen(parts key #8) is located between filter and rear axle trumpet. Trans needs to be drained to check/clean screen or put a running shop vacuum hose in hyd oil filler opening.

AR75603 Filter Element ADD 7.96 USD
This is the A&I part number for the rockshaft control cable that you can get some JD dealers to furnish.

A-AR26810 Rockshaft ADD 91.11 USD

OR the JD PN
AR26810 Push Pull Cable ADD 131.00 USD

This post was edited by Tx Jim at 09:09:08 12/13/13 2 times.

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mitch d

12-12-2013 16:13:33
72.160.222.68



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 Re: 3020 hydraulics in reply to Dennis430, 12-12-2013 15:20:58  
Ours does that too untill u tap the lever the other way. Worn parts i figured. Ours is early by the way



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MSM

12-12-2013 15:32:59
70.192.219.170



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 Re: 3020 hydraulics in reply to Dennis430, 12-12-2013 15:20:58  
If the loader is plumbed into the remotes,one of your couplers may be worn out and not unseating the tips, or the coupler lock may have turned, and partially released the coupler. The 3 pt cable probably froze, it may free up when it warms up, but I would replace it. If it got water in it and froze once,it will do it again.



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Dennis430

12-12-2013 15:50:23
70.197.213.52



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 Re: 3020 hydraulics in reply to MSM, 12-12-2013 15:32:59  
So the issues are not connected. I'm not sure what to look for in the couplers. Should I disconnect them, reattach and see what happens? I didn't know the 3pt was a cable system. I guess I have more stuff to take apart. I've got a basic understanding of how things work; this is my first tractor. Thanks again, DC



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D-

12-13-2013 07:58:14
166.137.12.93



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 Re: 3020 hydraulics in reply to Dennis430, 12-12-2013 15:50:23  
Not the couplers. If console tractor you have bad valve/valves. If you can switch sides problem should change to bucket so you will know for sure.



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Dennis430

12-14-2013 16:01:21
70.197.201.248



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 Re: 3020 hydraulics in reply to D-, 12-13-2013 07:58:14  
The loader is plumbed from under the cowling. The bucket is hooked up to the remotes by the rear PTO. There are manifolds on both sides for the loader. I'm guessing the problem is under the cowling at a valve assembly controlled by the loader lever. I appreciate everyone's help, but some of the replies are over my head. Should I just replace the control lever valve? Probably expensive. I don't know what the term "spool" means. Thanks again, DC

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buickanddeere

12-14-2013 20:04:01
209.240.119.130



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 Re: 3020 hydraulics in reply to Dennis430, 12-14-2013 16:01:21  
I'm sorry but I'm not sure how that works.



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Tx Jim

12-14-2013 16:38:22
69.35.160.115



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 Re: 3020 hydraulics in reply to Dennis430, 12-14-2013 16:01:21  
Dennis430

If you could post some photos showing how loader hyd attach to tractor someone on this forum can help solve your tractor & loaders hyd problem. A spool is parts key #21

Jim


This post was edited by Tx Jim at 16:39:37 12/14/13.



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D-

12-15-2013 07:04:49
166.137.12.34



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 Re: 3020 hydraulics in reply to Tx Jim, 12-14-2013 16:38:22  
Possibly he has those couplers that are on each side under the cowling handles. Were on older tractors (I thought 10 series but possibly early 20 series also) for loader hookups.
In that case it could be the couplers since there was no lever to hold the balls open. Those valves were not as problematic as those on console tractors.



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buickanddeere

12-15-2013 10:52:29
209.240.119.130



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 Re: 3020 hydraulics in reply to D-, 12-15-2013 07:04:49  
Quoting Removed, click Modern View to see
If the loader was connected to a joystick and supplied direct with a T in the high pressure line. And implements plugged into the scv(s).What would make which hydraulic cylinders drift ?



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Tim S

12-15-2013 11:13:37
68.75.24.151



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 Re: 3020 hydraulics in reply to buickanddeere, 12-15-2013 10:52:29  
Exactly,,, This is a problem that is simple to sort out but it has been complicated by several different ideas as to what is going on....that being said,, "If" it has a joy stick or a double stick valve working the loader functions and the loader "drifts up", then the only possible thing it could be is the loader valve is leaking past the spool. and it don't matter "where" your getting the supply from...and as we have always stated the best way to hook a loader control up is plumbing into the main supply line for pressure,,and returning through a ported filter bowl and using a separate valve for loader control.

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Tx Jim

12-15-2013 11:31:12
69.35.160.188



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 Re: 3020 hydraulics in reply to Tim S, 12-15-2013 11:13:37  
I think the loader on this 3020 tractor is scv controlled not ind 2 spool valve controlled.



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buickanddeere

12-15-2013 16:34:10
209.240.119.130



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 Re: 3020 hydraulics in reply to Tx Jim, 12-15-2013 11:31:12  
Quoting Removed, click Modern View to see
I agree that the loader is currently controlled from dash operated SCV's. I was just wondering instead of the time and $$$ rebuilding the dash mounted SCV valves .And rebuilding the worn couplers at the back.
Maybe it would be time and cost effective to go with a joystick instead of repairs?



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Tx Jim

12-15-2013 07:20:55
69.35.163.57



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 Re: 3020 hydraulics in reply to D-, 12-15-2013 07:04:49  
D-

You're probably correct.I'd forgotten about those type of couplers.



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