This ball joint connects the steering linkage to the axle assembly, allowing the wheel hub to pivot as the steering system moves. It is installed on both the front and rear axles of the host tractor. A worn ball joint introduces play in the steering, leading to imprecise directional control and uneven tire wear. The manufacturer produces this component to match the original assembly's taper and thread geometry, so the joint seats correctly in the knuckle without requiring additional shims or adapters. On installation, tighten the retaining nut to the specified torque and secure it with a new cotter pin.