The forklift's turning radius is also called the turning circle, that is important information for the operator to have. It gives the operator the knowledge of how much space is required to turn the lift truck around. Like for instance, a tighter turning radius allows the equipment to function successfully in tight places and crowded areas, therefore enhancing the forklift's maneuverability. Operators who do not know this measurement can cause damage to the equipment or to the property.
Make the necessary steering geometry alignment corrections before checking the turning radius. The test should start with an operator trainer assisting in the cab where they can help to control the equipment's functions. Another person on the ground uses a spray bottle or a hose to wet the inside and outside of the unit's wheels. After that, drive the machine in a complete circle with the wheels turned to the maximum angle. Repeat the procedure once and continue if necessary to wet the wheels.
Once this measurement test has been done, measure the watermarks left by the tires with a tape measure, from the tire mark's midpoint to a similar point across the circle's diameter. For the outside turning diameter, measure the watermark left by the outside tires from one side of the circle to the circle's opposite side. The inside turning diameter can be determined by stretching the tape measure across the circle left by the inner tires. After that, divide these numbers in 2 to be able to establish the turning radius. Be sure to note that the turning center is the midpoint of the circle's diameter.
Drop a plumb line from the extreme outside radial extension on the vehicle in order to establish the wall-to-wall turning diameter. When this is accomplished, next locate the point on the pavement directly below. This point to the turning center indicates the vehicle clearance radius. As a rule, wall-to-wall turning diameter is two times the clearance radius of the equipment.