The forklift's turning radius is also called the turning circle, which is vital information for the operator to have. It gives the operator the information of how much space is required to turn the forklift around. Like for instance, a tighter turning radius allows the machine to successfully function in congested areas and tight places, thus enhancing the lift truck's maneuverability. Drivers who are not aware of this measurement may cause damage to the property or to the machine.

Make the necessary steering geometry alignment corrections prior to checking the turning radius. The test should begin with an operator trainer helping inside the cab where they could assist to control the machine's functions. Another individual on the ground utilizes a hose or a spray bottle to wet the inside and outside 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 if necessary, continue to wet the wheels.

Once this measurement test has been completed, 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 could establish the inside turning radius 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 diameter of the circle.

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 done, next find the point on the pavement directly below. This point to the turning center indicates the machine clearance radius. As a rule, wall-to-wall turning diameter is two times the vehicle clearance radius.