Overturning moment measurement system

A lifting vehicle comprising:

• a vehicle frame;
• a turntable secured to the vehicle frame and supporting lifting components of the vehicle;
• a turntable bearing disposed between the vehicle frame and the turntable;
• and
• a stability measurement system comprising:
• a plurality of load sensors secured to the turntable bearing, the load sensors measuring vertical forces on the turntable bearing;
• and
• a controller communicating with the plurality of load sensors, the controller calculating a rotational moment applied to the vehicle frame from the turntable by processing the vertical forces on the turntable bearing measured by the plurality of load sensors.

A method of measuring stability in a lifting vehicle including a vehicle frame, a turntable secured to the vehicle frame and supporting lifting components of the lifting vehicle, and a turntable bearing disposed between the vehicle frame and the turntable, the method comprising:

• providing a plurality of load sensors secured to the turntable bearing;
• measuring vertical forces on the turntable bearing with the plurality of load sensors;
• and
• calculating a rotational moment applied to the vehicle frame from the turntable by processing the vertical forces on the turntable bearing measured by the plurality of load sensors.