Abstract: A cement mixer is provided for use with a pick-up truck, generally as a retrofit to an existing truck. The cement mixer can sit on the truck bed, having pivot mounts that engage the tailgate brackets, to facilitate dumping of a mix from the mixer. The system utilizes a hydraulic circuit connected in parallel with the truck power steering circuit. A shut-off valve redirects the hydraulic fluid to the auxiliary circuit, in driving relation with a hydraulic motor that powers the mixer paddles of the mixer.