I'm still tracking down the exact year. The machine was a United Rentals machine that was purchased from that non profit I have been dealing with. They used it some for debris removal and brush cutting. It has the buttons on the handle grips if that tells anyone anything about it as far the the model. I think the sticker said e or f series. It appears to me that the machine is less than 10 years old. The machine has 1900 hours on it. The kids at the non profit painted grafitti art onthe damn thing which I'm really not concerned with. I operated the machine and it starts up without hesitating no smoke at all. All around mechanically good it seems. The hydraulic system is another story. When I let off the handles to stop the machine would continue to creep forward and twice it crept backwards where you could hear the hydraulics engaged it was clearly not just the machine creeping along. I assume it may be the control valaves. as that what makes sense to me. What do you all think it is? How hard and expensive is it to do yourself? Where is it located as in what has to be removed to get to it to change? With all this said what would be the average price this machine is worth?