Vane motors consist of a slotted rotor (1) that is offset within the cam ring (2) and vanes (3) in the rotor slots which are free to move in and out. The vanes are held out against the cam ring by springs. As the slotted rotor is turned by the oil flow, the vanes move in and out of the slots in the rotor and seal on the outer tips against the cam ring, allowing the oil to flow from the inlet (4) to the outlet (5) ports, causing the motor to turn