Abstract: A receptacle dumping mechanism having a frame (29,37,38) mounted on the drive shaft (26) of a rotary actuator (24) mounted on the side of a collector vehicle (18), a face plate (34) pivoted to the lower end of said frame and adapted to engage a shoulder (17) on receptacle (10) to lift the receptacle as the frame is rotated, link means (40) interconnecting said face plate with the mounting plate (25 or 27) for the actuator, at a point (40') eccentric of the drive shaft (26), hook levers (53) pivoted on the face plate (34) adapted to engage an abutment (52) on the receptacle (10) to lock it in inverted position, and bell crank links (56) operatively connecting the hook levers (53) to a cross bar (38) on the frame.