I'm beating my head against the wall trying to figure this out. Intermittently, specifically when I am pushing a load, when I try to angle the blade to the right it goes left. Also it will angle left for no apparent reason, no input from the controller. I have recently pulled out, cleaned, and inspected the "A", "B", "C", and Pilot Check valves... They all appeared to be in good shape, I'm wondering if it might be the Crossover Relief Valve. Anybody have any ideas?