Hi new to the skid loader ownership. I have a case 1816b and the left side will not drive forward or backward. If I try to drive the right stick forward or backward and left at same time motor seems to want to stall. I'm thinking maybe the pump is bad on the left side. Also I'm looking at a New Holland 455, does anyone know of any common problems with this model, and the total height of machine? Thanks in advance. Todd