A "Mobile Drawbar Test Unit - UMEB" was developed at FCA/UNESP, Botucatu -SP, Brazil, to evaluate tractor performance in agricultural soil. The UMEB was built from a road trailer adapted to serve as load car used in draw bar tractor test. Its total mass is 10,500 kg sustained by a group of six pneumatic wheels. Field test showed that the UMEB generated traction force up to 35 kN, keeping it constant in different soil surface conditions, even when the forward speed changes.
mechanization; performance; tractive assay; tires
