Abstract: The invention relates to an arrangement in a forestry machine (100), in which arrangement there is —a chassis (12), —a single-axle set of wheels (13) pivoted to the chassis (12), and —at least one auxiliary wheel (18) fitted the outside the set of wheels (13), in order to increase the load-bearing capacity of the rear part (19) of the chassis (12). —The arrangement further includes —at least one support arm (20) arranged to carry the said auxiliary wheel (18) at its first end (22) and pivoted at its second end (24) to the said chassis (12) with the aid of a transverse shaft (23), —a support surface (36) attached to the chassis (12) and a counter surface (38) attached to the said support arm (20), for limiting the transverse movement of the support arm (20). —The invention also relates to a corresponding forestry machine.

Abstract: The invention relates to an arrangement in a forestry machine (100), in which arrangement there is—a chassis (12), —a single-axle set of wheels (13) pivoted to the chassis (12), and —at least one auxiliary wheel (18) fitted the outside the set of wheels (13), in order to increase the load-bearing capacity of the rear part (19) of the chassis (12). —The arrangement further includes —at least one support arm (20) arranged to carry the said auxiliary wheel (18) at its first end (22) and pivoted at its second end (24) to the said chassis (12) with the aid of a transverse shaft (23), —a support surface (36) attached to the chassis (12) and a counter surface (38) attached to the said support arm (20), for limiting the transverse movement of the support arm (20). —The invention also relates to a corresponding forestry machine.

Abstract: The invention relates to an arrangement in a forestry machine (1), in which there are front and rear units (2, 3) and bogie wheels (14, 15) mounted on a set of swing axles (12), as well as a crawler mat (20) running around the bogie wheels (14, 15) and an auxiliary wheel (16) outside the set of swing axles (12), and in which the auxiliary wheel (16) is essentially permanently mounted in bearings in the front and/or rear unit (2, 3), so that, when the set of swing axles (12) turns, the tension of the crawler mat (20) is maintained by means of flexible elements connected to its perimeter, which are principally formed of the flexibility of the auxiliary wheel (16).