Looking for the Formula to rate the capacity on Forklifts

The capacity rating plate on the forklift truck must be corrected when attachments are installed. This is called derating the lifting capacity. This is a rules and regulations mandate.

Forklift lifting capacity

The calculation formula is provided below. It is the forklift owner’s responsibility to contact their forklift truck manufacturer/distributor with this information to obtain a new capacity rating on the forklift’s nameplate.

  • The FLSC forklift scale comes in an ITA Class II (16” high, 5,000 lb/2,500 kg) model.
  • The QTLTSC forklift truck scale comes in ITA Class II (16” high, 5,000 lb/2,500 kg) and
  • ITA Class III (20” high, 5,000 lb/2,500 kg and 10,000 lb/5,000 kg) and
  • Class IV (25” high, 10,000 lb and 16,000 lb) models.

Each class comes in several widths for cleat type carriages. Measure the height and width of the forklift truck carriage. Select from the tables in this document, the appropriate width that best meets the dimensions of the forklift truck carriage.

Use the weights, dimensions and the following formula to calculate the net lifting capacity of your forklift truck with a scale attached. Refer to the illustrations.

formula to rate the capacity on forklifts
formula to rate the capacity on forklifts
looking for the formula to rate the capacity on forklifts
formula to rate the capacity on forklifts

Forklift lifting capacity calculator

The calculator that is used to decide on forklift load capacity was designed with the average individual in mind. The reason for this is easy and this is because the addition of attachments to a forklift carriage creates an entirely new dynamic to the stability of the lift and will change the carrying capacity. There is actually a very complicated interrelationship going on with a multitude of forklift parameters which is often too detailed for the average person to comprehend.

Deciding on forklift load capacity is critical because there are several issues that can impact residual capacity. Included among these are forklift model, tires, mast, carriage, side-shift distance, rotational torque, horizontal load center, vertical load center, attachment specifications, fork specifications, many others, which the calculator takes into deliberation.

Rated capacity forklift

Specifications are affected by the condition of the vehicle and how it is equipped, as well as the nature and condition of the operating area. Inform your dealer of the nature and condition of the intended operating area when purchasing your Truck.

Care must be exercised when handling elevated loads. When the carriage and/or load is elevated, truck stability is reduced. It is
important that the mast tilt in either direction is kept to a minimum when loads are elevated.

Operators must be trained and must read, understand and follow the instructions contained in the Operating Manual. All values are nominal values and they are subject to tolerances. For further information, please contact the manufacturer.

  • Weights are based on the following specifications: Complete truck with cab, pneumatic tires, mast, carriage, and forks.
  • Unladen with new tires
  • Bottom of forks n +/- 3% tolerance depend on tire inflated pressure or tire brand.
  • Full suspension seat in the depressed position.
  • Add 50 mm with load backrest
  • Optional equipment
  • Stacking aisle width is based on the VDI standard calculation as shown on the illustration. The British Industrial Truck Association recommends the addition of 100 mm to the total clearance (dimension a) for extra operating margin at the rear of the truck.
  • Distance center truck to the centre of the internal turning radius.
  • Travel speed laden/unladen limited at 25 km/h as factory default.
  • Gradeability figures are provided for comparison of tractive performance but are not intended to endorse the operation of the vehicle on the stated inclines. Follow instructions in the operating manual regarding the operation on inclines.
  • Engine data based on low mount exhaust.
  • Data available on request, as values are dependent on application.

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