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4020 hydraulic problem?

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Ray

03-13-2004 03:49:42

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I just purchased a 69 4020D with a Farm Hand loader. When I test drove it I noticed that the two levers on the loader valve were backwards (to me anyway) Pushed the lever forward and the loader came up pulled the other one back and it dumped the bucket. I thought I would switch it around on the remote on the tractor when I got it home. When I did the loader wouldn't work at all. Is this a problem in the loader valve or the tractor hydraulics? Any help would be greatly appreciated. Thanks
Ray

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John K

03-13-2004 07:25:23

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Re: 4020 hydraulic problem? in reply to Ray, 03-13-2004 03:49:42

It sounds to me when you switched your hoses to the loader that you mixed one hose from the bucket cyclinder with one from the cyclinder that raises the loader. If so you have no way for the oil to go as it is cross connected. Check that the hoses to the bucket are on the same remote if backward, switch them around. Then do the same with the loader lift cycinders. Had a simulare problem when I installed a mid mount remote formy loader on a TN75S.

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david val

03-13-2004 06:45:31

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Re: 4020 hydraulic problem? in reply to Ray, 03-13-2004 03:49:42

if you use the tractor remotes, they should work exactly the same in both direction. follow the hoses and make sure the plumbing is right, check carefully the male tips, make sure they are not under pressure when connected (you can push the ball against its spring). make sure the coupler is in all the way in when connecting and that the lever is locked at right angle to the coupler. make also sure that the float position is locked up at the scv levers. when everything works fine you can enable the float in the lift scv. in float the bucket stays on the ground under it's own wheight and follow ground contours.
david

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Ray

03-13-2004 04:31:08

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Re: 4020 hydraulic problem? in reply to Ray, 03-13-2004 03:49:42

Van,
Why didn't I think of that? Ha Ha
Thanks alot,
Ray

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Ray

03-13-2004 05:15:55

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Re: Re: 4020 hydraulic problem? in reply to Ray, 03-13-2004 04:31:08

Van,
All kidding aside shouldn't it have worked when I switched the hoses around on the tractor remote or is a loader with a valve different from say a straight plug in like a haybaler or disk cylinder?
Thanks for the help.
Ray

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Mark

03-13-2004 06:54:35

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Re: Re: Re: 4020 hydraulic problem? in reply to Ray, 03-13-2004 05:15:55

The 4020 uses a demand type system for remotes. The system pressurizes to 2500# and sits there. When a drop in pressure is detected (you opened a valve to raise the arms) the pressurization system responds until pressure is reestablished....at something like 24 gpm...that's a lot of fluid flow. There isn't any continuous fluid movement (like Ford) unless you tell the system to do some work. That is why you use a CLOSED CENTER on green and OPEN CENTER on blue.

You should have a closed center dual 2 way valve to control your loader (2 supply lines and 4 load lines). Each side has a center position (spring loaded) and a forward and reverse. The system is set up for 2 way cylinders so that you can force the hyd. cylinder in either direction...you can lift a bucket full of dung or push down, raising your front tires off the ground and fix a flat. When you pull the control piston out of the valve body toward you the front hose is activated and pushing is the converse. This is where you want to do the swapping as it is the easiest spot. Each line should have a swivel on at least one end. The other is usually just a male 1/2 pipe plug.

The main valve body has two side ports (Cross does), one inlet marked IN and the other return (to the tractor sump). This fluid flows the same way all the time only when a valve is activated. While one port of your 2 way valve is letting pressurized fluid into the cylinders you want to operate, the other half of it is letting fluid out of the hyd. cylinder so that it's position can be changed.

If you get any air in the sytem, just work the controls back and forth a half dozen times and it will purge it'self.

Mark

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Mark

03-13-2004 06:59:56

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Re: Re: Re: Re: 4020 hydraulic problem? in reply to Mark, 03-13-2004 06:54:35

I did not discuss "float" as I bought a valve body without it. Val explained that function for you as I know how it works, but I do not what you have to do with the controls to activate it. Sometimes you may want the bucket to float, like scraping dung off concrete, but other times you don't want it to float like when spreading rock on your driveway and attempting to get it level....back up when doing this, dragging the bucket flat on the rock. The distance from the bucket to the rear tires is huge and makes for a very smooth job.

Mark

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Van in AR

03-13-2004 04:26:10

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Re: 4020 hydraulic problem? in reply to Ray, 03-13-2004 03:49:42

You need to switch the hoses around on the valves.
Van

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