Excessive clamp force caused by too much hydraulic pressure is a common causes of damage. Mechanical 3-position relief valves are under-utilized or primarily left on the high setting. HFC (Hydraulic Force Control) solves these issues by automatically adjusting clamp force. HFC is a hydraulically controlled automatic clamp force system that senses the hydraulic pressure necessary to lift the load and adjusts clamping pressure proportional to the load weight. The system operates without any special actions on the part of the driver.