A lot of interesting things going on here...almost too busy with the reflections and changes in depth across the image. I start out looking at your subject but very quickly wander to the background. Looking at it a few more minutes I find myself looking through your subject and around it bypassing your subject altogether. The wheel seems a bit dark. The rust can handle this. But perhaps if the wheel was a little brighter to get more detail of the surface as well as making that yellow stand out a bit more may have helped to keep the subject the point of focus.
The perspective here is just odd. The weighting is disconcerting. The wheels should be anchored to the bottom of the picture. Remember that the bottom of a picture is almost always perceived to be the ground, the front, closer, etc. Anything that looms large in the top of the frame looks like it's flying and that just doesn't work in this photo's favor. I'd also like to see more of the object you're shooting and less of its rock stage.
The deep red, yellow, and black colors are pretty. The content of the image frustrates me a bit though, because I can't quite figure out why the 'earth mover' is sitting on the edge of a ledge. I'd love to see a picture of this whole tractor or whatever it is. Good luck - hope you get a lot of constructive comments!