The majority of Thomson industrial linear actuators are maintenance free. Thomson does offer some replacement parts for the Electrak 2, 10, 5, 100, 205 and PPA actuators.  The smaller Electrak 1, E050 and E150 are not user serviceable. We do recommend lubricating the Electrak 205 every 25,000 cycles to ensure long life.  The manual for each specific actuator provides further details about installation and general care of the actuator.
VIDEO: Actuator Maintenance Requirements