The lift truck's turning radius is also known as the turning circle, that is vital information for the operator to have. It gives the operator the information of how much space is needed to turn the forklift around. For example, a tighter turning radius allows the machine to operate successfully in restricted places and crowded areas, thus improving the maneuverability of the forklift. Operators who are not aware of this measurement may cause damage to the machine or to the property.
Before testing the turning radius, check the steering geometry alignment and correct it if it needs adjustment. Start the test with having the trained operator in the cab to control the equipment's functions. A second individual on the ground utilizes a spray bottle or a hose to wet the outside and inside of the unit's wheels. Then, drive the equipment in a whole circle with the wheels turned to the maximum angle. Repeat the process once and continue if necessary to wet the wheels.
When this measurement test has been accomplished, measure the watermarks left by the tires using a tape measure, from the midpoint of the tire mark to a similar point across the diameter of the circle. For the outside turning diameter, measure the watermark left by the exterior tires from one side of the circle to the circle's opposite side. You can establish the inside turning radius by stretching the tape measure across the circle left by the inner tires. Next, divide these numbers in 2 in order to determine 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 machine in order to establish the wall-to-wall turning diameter. Once this is completed, next locate the point on the pavement directly beneath. This point to the turning center indicates the machine clearance radius. As a rule, wall-to-wall turning diameter is twice the vehicle clearance radius.