Abstract: A torque collar provided with adjustable stops to engage torque transmitting members disposed at angularly spaced locations around the stator of a motor. The collar is particularly suited for use with high torque low-speed hydraulic motors wherein some free play between the stator of the motor and the collar is desirable. One embodiment provides for adjustment of the stops through means of screw mountings for the stop surfaces. Another embodiment provides for adjustment of the stops by mounting the stop surfaces on supports which are hydraulically coupled to balance the forces on the angularly disposed torque transmitting members.

Abstract: A wiper for scraping debris from between the convolutions of an earth boring auger. The wiper comprises a "daisy-like" wheel having radially extending peripheral fingers successively engagable between the convolutions of the auger to scrape debris therefrom. The wheel is mounted adjacent the auger for rotation about an axis disposed in a plane generally normal to the longitudinal axis of the auger whereby, when the wheel is engaged with the auger, rotational and/or longitudinal movement of the auger functions to rotate the wheel to successively move its fingers into and out of engagement between the convolutions of the hanger. An hydraulic cylinder is provided to selectively move the wheel into or out of engagement with the auger.