excavator aux hydraulics

[cbailey1956]

Hello, I have a JD 70D excavator that I use for small clearing and lot cleanup. Have a lot of jobs that consist of 4 - 8 inch trees that can be pushed over. Anyway I recently acquired a rotobec rotating grapple assembly that I want to install on the bucket linkage. I want the grapple to move like the bucket and also rotate and open/close. So that is 3 hyd functions from one circuit. My thoughts are to assembly two stackable selector valves on the arms and power from the bucket circuit. This would give me the 3 circuits I need but only one at a time would work. Unsure if a DO3 subplate with solenoids would allow me to run maybe two at a time depending on the flow overall. The unit has two 29GPM load sensing pumps (open center). Best I can tell from the factory schematic is that the bucket pulls from one of these pumps. I plan on installing a handle with appropriate switch's on the bucket joystick. (pilot system). Open to ideas. I also have a cat hyd auger I would like to use when the grapple or bucket is not installed. Thanks for reading, Craig

 

[oldnslo]

Using D03s or diverter valves fed by your existing valves will work. Like you stated you will be limited to one function at a time