This paper presents the systems enabling testing of pumps, motors and hydraulic transmissions with minimal loss of energy. The energy required to be produced during the load test of hydraulic machinery is recovered to a large extent. In energy recovery systems a pump and motor with pressure regulator have been used. The stands with hydraulic brake, designed for testing of machinery and transmissions, offer a possibility to perform accurate measurements. The whole energy required to load tested machinery is converted into heat on those stands. The new proposed stands, presented in the paper, do not have disadvantages occurring in the hitherto known systems. It was achieved due to application of self-adjustable units with built-in pressure regulators.