The present disclosure refers to a boom mounting assembly for attachment to an agricultural machine, comprising a primary frame (12) and a boom support frame (1) configured to support a boom (10) and suspended from the primary frame (12) such that the boom support frame (1) can pivot at least in a transverse plane around a longitudinal axis of rotation provided in a pivot point. At least one bearing assembly (20) is provided on the primary frame (12) or the boom support frame (1) configured for guiding a movement of the boom support frame (1) relative to the primary frame (12). The at least one bearing assembly (20) comprises a bearing member (21) which defines a bearing surface (22) which is configured to rest detachably against at least one of the primary frame (12), the boom support frame (1), and a boom section of the boom (10), wherein the bearing surface (22) is convexly curved in any direction in the transverse plane. The bearing member (21) may be a ball member. (Fig. 2)