Patent ID: 8684649

Claim:
A grain cart for connection to a towing vehicle for movement therewith in a forward working direction, the grain cart comprising: a main frame; a pair of front wheel assemblies including respective front wheels supported at opposing sides of the main frame so as to be arranged for pivotal movement relative to the main frame about respective upright steering axes; a hopper supported on the main frame so as to be arranged to receive particulate material therein; a hitch arm having a front end arranged for connection to a towing vehicle and a rear end supported for pivotal movement relative to the main frame about a substantially horizontal hitch axis oriented perpendicularly to the forward working direction; a rear axle support member supporting a pair of rear wheel assemblies including respective rear wheels thereon such that the rear wheels are fixed in orientation; and a rear suspension mechanism coupling the rear axle support member to the main frame at a position spaced rearward from the front wheel assemblies such that the rear wheels are oriented for rolling movement in the forward working direction and such that the rear axle support member is generally arranged for rocking movement about a longitudinal axis oriented in the forward working direction relative to the main frame wherein: the rear suspension mechanism comprises a pair of hydraulic suspension members coupled between the main frame and the rear axle support member at opposing sides of the main frame such that each hydraulic suspension member is pivotally coupled at opposing ends to the axle support member and the main frame respectively for relative pivotal movement about respective axes oriented generally in the forward working direction; the hydraulic suspension members each comprise a piston received in a cylinder so as to be arranged for linear extension and retraction; the hydraulic suspension members are connected to one another such that extension of a first one of the hydraulic suspension members corresponds to retraction of a second one of the hydraulic suspension members and retraction of the first one of the hydraulic suspension members corresponds to extension of the second one of the hydraulic suspension members; and the rear suspension mechanism further comprises a linear damper member coupled between the rear axle support member and the main frame which extends in a generally lateral direction oriented to extend between opposing sides of the main frame.