Country Angler
Member
Hello everyone, love this site.
I have a 2000ish Daewoo Solar 035 serial number 0035. I know the serial number thing is confusing being the same as the model. Been a little annoying.
The problem I am having is similar to a couple of others I have found on here, but I am not able to parts swap as easy as other guys with more brand name machines to know for sure. Basically my controls, boom especially as you pull or push forward on the joystick ever so slightly, nothing, nothing, nothing, a little bit of movement, Full Speed! So when you try to operate the machine normally, the boom function moving the most weight, jerks so bad the machine hops like a kangaroo. And when you hop, your hand moves the stick more, and it magnifies the problem.
I measured the pilot pressure to the lines that feed the joysticks, and its about 550psi, right where the service manual says it should be. I suspected it would be too high, causing the control valve spools to move too much on the associated cylinders, but the pilot system pressure is right at spec.
The next possibility I thought of is the joystick pilot valves themselves either having a seal problem allowing too much flow with very little movement of the joysticks, or weak springs causing the same issue, too much flow too fast to the associated control valves. They are leaking from the plungers on the tops.
But, the control valve assembly for my machine is about $700/ea from Korea, and that's a lot to risk if it's not the problem. The question is, could I just use another manufacturers joystick control valve such as a John Deere or Komatsu, which has your 6 connections on the bottom, readily available for $100-$200? Or would there be major hydraulic flow and pressure discrepancies that would prevent it from working? I can adapt the plumbing and fabricate the mounting readily enough so that nobody would ever know it wasn't stock. But, the pressures and flows actuating the cylinder control valves on the other end of the pilot lines are my concern.
Or, am I barking up the wrong tree? Sticky cylinder spool valves? Weak cylinder spool valve springs? Wrong hydraulic fluid, too thin, flowing too quickly?
Any thoughts or advice?
Thanks in advance guys.
Jack
I have a 2000ish Daewoo Solar 035 serial number 0035. I know the serial number thing is confusing being the same as the model. Been a little annoying.
The problem I am having is similar to a couple of others I have found on here, but I am not able to parts swap as easy as other guys with more brand name machines to know for sure. Basically my controls, boom especially as you pull or push forward on the joystick ever so slightly, nothing, nothing, nothing, a little bit of movement, Full Speed! So when you try to operate the machine normally, the boom function moving the most weight, jerks so bad the machine hops like a kangaroo. And when you hop, your hand moves the stick more, and it magnifies the problem.
I measured the pilot pressure to the lines that feed the joysticks, and its about 550psi, right where the service manual says it should be. I suspected it would be too high, causing the control valve spools to move too much on the associated cylinders, but the pilot system pressure is right at spec.
The next possibility I thought of is the joystick pilot valves themselves either having a seal problem allowing too much flow with very little movement of the joysticks, or weak springs causing the same issue, too much flow too fast to the associated control valves. They are leaking from the plungers on the tops.
But, the control valve assembly for my machine is about $700/ea from Korea, and that's a lot to risk if it's not the problem. The question is, could I just use another manufacturers joystick control valve such as a John Deere or Komatsu, which has your 6 connections on the bottom, readily available for $100-$200? Or would there be major hydraulic flow and pressure discrepancies that would prevent it from working? I can adapt the plumbing and fabricate the mounting readily enough so that nobody would ever know it wasn't stock. But, the pressures and flows actuating the cylinder control valves on the other end of the pilot lines are my concern.
Or, am I barking up the wrong tree? Sticky cylinder spool valves? Weak cylinder spool valve springs? Wrong hydraulic fluid, too thin, flowing too quickly?
Any thoughts or advice?
Thanks in advance guys.
Jack
