The present disclosure refers to a boom mounting assembly for attachment to an agricultural machine, comprising: a primary frame； a boom support frame (1) configured to support a boom and suspended from the primary frame such that the boom support frame (1) can pivot in a transverse plane around a longitudinal axis of rotation provided in a pivot point； a first sub-frame member (22； 23； 24) provided on the primary frame or the boom support frame (1)； and a first roller member (25； 26； 27), the first roller member (25； 26； 27) rotatable around a first roller axis of rotation (25b； 26b； 27b) provided on the first sub-frame member (22； 23； 24), and a running surface of the first roller member (25； 26； 27) configured to rest detachably against at least one of the primary frame, the boom support frame (1), and a boom section of the boom. The first sub-frame member (22； 23； 24) is rotatable jointly with the first roller axis of rotation (25b； 26b； 27b) and the first roller member (25； 26； 27) around a first sub-frame axis of rotation (22a； 23a； 24a) which is extending transversely to the first roller axis of rotation (25b； 26b； 27b).
