Three-Point Hitch Dynamometer Design and Calibration

A three-point hitch dynamometer was designed, constructed and calibrated. The dynamometer is suitable for use with tractors up to 90 kW using category II and III mounted implements, and also trailed implements. A hydraulic clamp was used to absorb shock loads while equipment was being transported and lifted. Calibration of the dynamometer shows that the instrument is accurate to within 5% for draft forces ranging from 5 kN to 45 kN in any direction.