The Eaton Capacity Limiting System (CLS) was developed for use on counterbalanced lift trucks to prevent abuse of these trucks as a result of overloading. The heart of the system is a hydraulic valve termed the “overload control valve”. This valve reacts to the magnitude of the load moment acting on the truck rather than merely the magnitude of the load. The load moment is defined as the mathematical product of the force exerted by the load and the horizontal distance between the front axle centerline and the vertical projection of the load center of gravity. When the load moment exceeds a predetermined allowable magnitude, the valve prevents further lifting or forward tilting of the mast.