all right update time.
have sorted my issues with the 4200.
I had a leaking pump seal, new pump sorted that.
I played with the radio settings and made a complete hash of it.
read the manual, did some more playing and fixed it. slowed the slue and speed the main boom drops
had a small problem bleeding the system, worked out one of the problems was I put the tank back in the wrong way around and the suction line was fitted to the return of the tank, so the rams would move , fill the tank enough to force oil into the pump then it would run dry again!!! MUPPET!!!
still , im learning and wont do that again.
radio is pretty easy do use now, so will play around a little more with the settings.
had to test it all out so dragged the screening plant outside and had a play.
http://youtu.be/71ClQVuDoD0