When complex machinery configurations or location hinder easy access to activation, RO 111/211 Remote Over Center PTO can be engaged and disengaged remotely via control valve and/or electronic control. Hydraulic or pneumatic actuation is achieved through ports, making access to fittings straight-forward. PTO utilizes one 11 in. friction plate in 111 model and 2 plates in 211. Design allows for side load and inline applications, while eliminating external cooling, filtration, or rotary union.