My dad recently bought a M-F 285 with an aftermarket Bush Hog loader. It had steering problems so he took it to a local M-F dealer. They pulled the front axle; rebuilt the steering cylinder; replaced bushings, berings, gaskets and seals; then later on the steering hydraulic pump. It will not turn more than 10-15 degrees if sitting stationary. steering wheel will turn but wheels do not. The dealer tells us that this is all they can do. This steering system cannot handle the extra weight of the loader. IS THIS A POOR DESIGN BY MASSEY; OR; IS THE DEALER EXCUSE FOR BEING UNABLE TO DIAGNOSE AND REPAIR. (steers okay if moving) What is your experience???