The paper describes experimental equipment for measurement of static characteristics of rotary
hydraulic motor. It is possible to measure flow, pressure, temperature, speed and torque by means of this
equipment. It deals with measurement of static characteristics of a gear rotary hydraulic motor. Mineral oil is
used as hydraulic liquid in this case. Flow, torque and speed characteristics are evaluated from measured
parameters. Measured mechanical-hydraulic, flow and total efficiencies of the rotary hydraulic motor are
adduced in the paper. It is possible to diagnose technical conditions of the hydraulic motor (eventually to
recommend its exchange) from the experimental measurements.