A robot includes a base, an arm provided on the base, and a reducer having a sliding part and decelerating driving of the arm, wherein a lubricating oil can be supplied to the sliding part from an opposite side to the arm with respect to the sliding part.

An industrial robot having a plurality of joints; a plurality of links arranged to be driven in motion by the joints; a housing including the links, an opening and a cover for selectably closing the opening, the housing defining an interior region and an exterior region of the industrial robot; and for at least one joint, a kinematic device associated with the joint and positioned in the interior region, and at least one fluid connection in fluid communication with the kinematic device, each fluid connection being arranged to supply lubricant to, or to receive lubricant from, the kinematic device and being accessible from the exterior region through the opening when the cover is removed for connecting a service tool to the fluid connection. A system having an industrial robot and a service tool is also provided.