The Rol-Vane Hydraulic Motor helps in applying changing speed rotary hydraulic power. It has a constant input pressure due to linear output torque. No need for lubrication because it is automatically provided by the driving fluid. Oil temperature may change every minute for about 7°F. The advisable operating temperature will range from 100°F to 130°F . Minimum speed may occur due to fluid control device. Identical flow paths within the motor will be obtained. This device has a maximum speed of 1200 rpm, a maximum pressure of 3000 psi and a flow rate of 3.3 gpm per 100 rpm.