Brush life will depend on current density, duty cycle, and environmental conditions. The absolute best estimate of brush life comes from data obtained while operating in the application. The brush inspection interval and process (if needed) may be included in the operating manual for the equipment which has the Bodine product installed. However, if such guidance is not available from the OEM, then we recommend that brush inspection be carried out at regular intervals of 4-6 months, or 1000 hours, depending on how many hours a day the motor operates. Assuming that all variables (i.e., current density, duty cycle, environmental conditions) are reasonably consistent, brush life should be fairly linear. It’s important to remember that one brush will wear more than the other if the motor only operates in one direction (i.e., CW or CCW), so both brushes should be checked for wear. Once you establish a brush wear rate for your unique application, you can adjust your inspection intervals accordingly.