This disc spring from Carraro is a Belleville-type washer that applies a preload force to the axle assembly. It sits in the front axle housing, where it maintains tension on the bearing stack or differential assembly, compensating for thermal expansion and component wear. A disc spring that has lost its load height will allow axial play in the axle, leading to gear noise and premature bearing failure. The spring is manufactured to the original thickness and outer diameter so that it fits the housing pocket without shimming. When replacing, ensure the spring is oriented with the concave face against the bearing race as originally installed.