Abstract: Provided is an arrangement that attaches a ground-engaging tool (GET) to an adapter on support structure of ground/earth engaging/conditioning apparatus. A retainer is in a recess of the adapter. A fastener is received through the GET aperture and into the adapter aperture. The head of the fastener can be within a recess of the GET. The recess can be multi lobed/shaped to receive the retainer and prevent rotation or other torsional/lateral deformation of the retainer when tightening/inserting the fastener. A fastener has a first threaded portion adjacent the head of the fastener and a second threaded portion along a shaft portion of the fastener extending distal from the head. The first threaded portion can be wider and/or of a more coarse thread pitch than the second threaded portion.

Abstract: Provided is an earth conditioning system/apparatus which removes/break-ups rock in the ground and has a front drawbar, a ground engaging tool arrangement and a rear rotary device (drum). A ground engaging tool arrangement includes a frame supporting ground engaging tools each mounted at a pivot. Actuators raise/lower the ground engaging tool(s) for desired depth control of the ground engaging tools. The rotary device slotted or ribbed drum acts as a crushing drum rolled over earth that has been broken up by the ground engaging tools. Actuators, provide height adjustment of the ground engaging tools relative to the ground engaging tool support frame and by adjusting the height from the ground of the ground engaging tool arrangement by operating the at least one adjuster acting between the rotary device and the ground engaging tool arrangement.