LEGO Technic 8271 Wheel Loader

Most of the times, the arm of the shovel of my wheel loader got stucked when lowered, and didn't get the shovel down to the ground level.
The problem was that a lift arm bumped on a chasis beam, and so I solved the problem making the distance between the front weels 1 stud apart.
I used some extra parts, and repositioned others. In particular the picture LEGO8271_04C.jpg might get you the idea how it was done.

Later I found myself several times searching for parts that get loose from the rear bumper, wile my children play with the Wheel Loader.
So I built a new bumper that, though not as good looking as the original, has a much more solid construction (and more Technic look, I think).
The images for the new bumper are named has 8271_mod_0x.jpg