I picked up a Scat Trak 530 mini excavator with pilot controls. The machine runs great but has hydraulic control problems. The problem is the boom, bucket, and crowd operations are slow or barely work, unless you operate a function on the opposite joystick at the same time. The left side drive track is stuck but the right seems to move as long as you are operating another function. It appears the control block is divided into three segments. One being, turntable, blade, and offset boom (This group works fine). Second being Right track, bucket, and aux, and a third being boom, left track and crowd.
When you try one function all by it self it sounds like a relief valve is opening, not sure which one, port or main relief. I have checked the three main reliefs to see if they are stuck and they appear to be in working order. I have also moved the relief from the working circuit (Blade and offset boom, and turret control) but that did not have any effect on anything. The guy I bought it from had the pumps tested and they are within spec. All of the electrical solenoids are getting power and seem to be working.
Any ideas on where to go next?
When you try one function all by it self it sounds like a relief valve is opening, not sure which one, port or main relief. I have checked the three main reliefs to see if they are stuck and they appear to be in working order. I have also moved the relief from the working circuit (Blade and offset boom, and turret control) but that did not have any effect on anything. The guy I bought it from had the pumps tested and they are within spec. All of the electrical solenoids are getting power and seem to be working.
Any ideas on where to go next?