Due to the limited transverse bearing capacity of the suspension cylinder, a lower arm is introduced between the hub and the gearbox to distribute the transverse load on the suspension cylinder. To analyze the forces acting on this component and its impact on the suspension cylinder, force equations for the hinge points of the lower swing arm and suspension cylinder are derived based on the equilibrium of spatial forces and moments. These equations are validated by indirectly comparing them with the forces on the left and right tires obtained through FEA. The derived theoretical formula is further validated by calculating the stresses on the lower swing arm and comparing them with the simulation results. The comparison shows a good correlation between the theoretical and simulation results, demonstrating the applicability of the formula in engineering calculations.