Loss of stability in harvesting equipment is usually preceded by a loss of traction. It is important to quantify the traction that a harvesting machine experiences in a variety of ground conditions in order to model the machine stability in steep terrain. A simple scale traction model was constructed and used for testing to determine a range of coefficients of friction for ground surfaces in coastal B.C. Preliminary results indicated the range of traction conditions found in BC forest stands. Large-scale testing with a full machine is planned in 2018 to validate and calibrate the small-scale tests.