Roller bearing rated life depends on operating conditions such as load, working temperature, enviroment conditions. Increased working temperature may lead to a premature bearing failure. Causes for the increased working temperature may be load of the bearing, mounting type, grease quality, room temperature etc. In this thesis test rig is presented with strain gauges for measuring load on the bearing and resistance temperature sensor for measuring working temperature of the bearing. It was found out that stationary working temperature of the bearing increases with a load increase at 600 rpm bearings rotation speed and room temperature between 20 and 23 °C. In this conditions the bearing load should not exceed 25 % of bearing dynamic radial load. Otherwise, stationary working temperature of the bearing would surpass 70 °C, which would lead to bearings grease failure and consequently premature bearing failure.
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