a motor shifting valve which changes the motor internal oil flow pattern to the high torque slow speed configuration when the pressure in the pressure sensing valve 45 falls below a second preset level factory level set at approximately 150 psi the oil flowing through the pressure sensing valve 45 from port 1 to port 2 is shut off and port 2 is connected to port 3 this permits a return spring in the motor shifting valve to move the valve spool back to the low torque high speed position oil which is displaced when the valve spool returns passes through pressure sensing valve 45 from port 2 to port 3 and thereon and into case drain system of motor 20 port 3 on pressure sensing valve 45 is connected by a line 46 to the case drain system port 48 on motor 20 in operation the pressure sensor unit 30 may be set to actuate the motor speed change valve at a preset level such as 250 psi or any other selected pressure as long as the hydraulic pressure stays below such preset level the motor will operate in the high speed level if on a drilling condition where the hydraulic pressure rises such pressure sensor unit 30 will determine that a higher hydraulic pressure is being applied therefore a higher torque is needed to auger at such time pressure sensor unit 30 will switch motor 20 to drill in a higher torque low speed state system 10 thereby automatically determines whether or not high torque auguring is necessary in most applications hydraulic system 10 will attempt to maintain motor 20 in the high.