Patent ID: 7584812

Claim:
An articulated dozer, comprising: a front chassis portion; an articulation joint; a rear chassis portion connected to the front chassis portion via the articulation joint; a first A-frame; a second A-frame, a length of the second A-frame frame being approximately equal to a length of the first A-frame frame, the front chassis portion and the rear chassis portion, respectively suspended above the first and second A-frames; a first ball joint; a second ball joint, a narrow portion of the first A-frame connected to the front chassis portion via the first ball joint, a narrow portion of the second A-frame connected to the rear chassis via the second ball joint, the first ball joint and the second ball joint in proximity to the articulation joint; at least one accumulator; a first suspension cylinder operatively attached to the front chassis portion and the first A-frame; a second suspension cylinder operatively attached to the front chassis portion and the first A-frame; and at least one valve, the at least one valve capable of stopping hydraulic flow from and to the at least one accumulator, the first and second suspension cylinders hydraulically connected to the at least one accumulator via the at least one valve.