Problems with my Vario Excavator

[cbazq271]

Hi, I just have a question about the Vario excavators. I just bought one a day ago, its a 850d version. It was already built and it came with no instructions. I was running it this morning and it was running great. I was using it and the hydro pump was running nice, smooth and quite. One of my scoops of dirt was wet dirt and when I spun to dump the dirt the machine tipped forward onto its bucket, not much maybe picked the back of the machine up 3 inches. As soon as it did this the pump started to sqeel real loud. I turned the pump off a second or two after the pump started sqweeling. Now when I turn the pump it sqweels and the pressure gauge needle jumps all over the place. If I slow the pump way down the sqweeling stops and the gauge works fine. I think it has air in the system somewhere. What do you think? Also how do you bleed the air out. I think when I first got the machine the gauge had some hydro fluid in it, It looks like there is not any in it now. This would explain the bouncing needle, how do I get the air out. Any help would be great thanks, Chad