The turning radius on a forklift is also known as the turning circle. This piece of information is vital for a machine operator to have. It gives the driver the information of how much space is needed to turn the lift truck around. For example, a tighter turning radius enables the equipment to successfully work in restricted places and crowded areas, therefore improving the maneuverability of the forklift. Operators who do not know this measurement may cause damage to the property or to the equipment.
Prior to checking the turning radius, check the steering geometry alignment and correct it if it requires adjustment. Start the test with having the trained driver inside the cab to control the equipment's functions. A second person on the ground uses a hose or a spray bottle to wet the outside and inside of the unit's wheels. Then, drive the machine in a complete circle with the wheels turned to the maximum angle. Repeat the procedure once and if necessary, continue to wet the wheels.
After this measurement test has been accomplished, measure the watermarks left by the tires using 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 opposite side of the circle. The inside turning diameter can be determined by stretching the tape measure across the circle left by the interior tires. Next, divide these numbers in 2 in order to establish the turning radius. Be certain 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. When this is accomplished, next locate the point on the pavement directly underneath. This point to the turning center indicates the machine clearance radius. As a rule, wall-to-wall turning diameter is two times the equipment clearance radius.