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Abstract. The dynamic model is significant for the analysis of the vibration control of the front axle hydraulic suspension for the wheeled tractor. In this work, the nonlinear stiffness and damping equations of front axle hydraulic suspension are derived. The dynamic model coupling relationship among hydraulic control system, hydraulic suspension structure, and front axle are pointed out. An active control strategy was applied to decrease the vibration acceleration. To validate the model, the simulation of the proposed model is proposed to realize. The dynamic response of the mechanism with clearance under operation condition is explored for the case of a mechanism with a front axle hydraulic suspension system. Results indicate that the front axle hydraulic suspension will deteriorate the ride comfort of the driver and improve the control accuracy.