Abstract: A walk aerator comprises a frame supported by a plurality of ground engaging wheels, the frame carrying a coring head having a plurality of side-by-side tine assemblies. The wheels define a wheelbase which is substantially equal to or less than the width of a coring swath and the wheels are located in advance of the coring head to keep the wheels from passing over the holes or soil cores left in any preceding coring swathes formed by the aerator. The vertical position of the coring head is adjustable up and down as the ground contour changes to keep hole depth substantially constant. The tine assemblies are reciprocated by a single crankshaft driven by a single pulley, the crankshaft being assembled from multiple crank arms that are splined and bolted together. Sealed bearings connect drive arms that drive the tine assemblies to the crankshaft. The crankshaft can be disassembled to allow the sealed drive arm bearings to be replaced. Integral core deflectors are used on the drive arms.

Abstract: The present invention provides a method and apparatus for controlling a work implement in order to enable an earth moving machine to move to a service area after a failure within an implement control system occurs. The method includes the steps of detecting the failure of the implement control system, enabling a limp home mode in response to the failure, and controlling the implement into a limp home position through operator interaction using a display and either an associated keypad or a touch screen.

Abstract: Paired, side by side sets of upper and lower wheels are connected together and driven by jack shafts pivotally mounted at respective ends to the upper and lower wheels of each set. One common shaft rotatably mounts the upper wheels, and a second shaft mounts the lower wheels for rotation about common axes to effect driving of the upper wheels and lower wheels in unison. The jack shafts joining the upper and lower wheels, respectively, of each set, are angularly offset to achieve desired timing and rotation of the wheels in unison and the sequence in projection and retraction of tines mounted through the jack shafts to the lower wheels of each set. The arrangement insures tine entry and retraction from the ground perpendicular to the ground. It also permits doubling the RPM of the wheels to increase the force driving the tines into the turf. Machine propulsion is effected automatically as a result of driving the tines in the ground and retraction of same.

Abstract: The rocking lever for a cam mechanism presents a hollow box-type structure and consists of a modular base piece provided with the trunnions and with the cam follower rollers adapted to cooperate with the cams. The modular base piece presents two connection surfaces, arranged at 90.degree. with respect to each other, and adapted for the fastening of modular appendix pieces. The said modular appendix pieces can be secured in a removable and changeable manner to the modular base piece.