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Re: Re: Re: 4020 hydraulic problem?
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Posted by Mark on March 13, 2004 at 06:54:35 from (209.151.113.248):
In Reply to: Re: Re: 4020 hydraulic problem? posted by Ray on March 13, 2004 at 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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