My cat 312c keeps losring power when it is facing up hill wen you run it it will just bog down and stall soon as it level it has all power. Lift the front up a foot or more and it will die soon as you load up hydrolics cleaned out fuel tank filters and tested fuel presher all good must be a hydrolic thing? It's pretty odd how it changes soon as front is up hill.
Inspect the fuel supply line for a pin hole to draw air through at that angle. Later Bob