Arrangement for stabilizing at least one frame part of a forestry work unit (1), wherein the forestry work unit has at least two frame parts (2, 3, 4) which are rotatable relative to each other substantially about a longitudinal axis of rotation of the forestry work unit, characterized in that the arrangement comprises at least one device ( 71, 81a-81d, 72, 82) for determining a component of a moment exerted by a payload of the forestry work unit (1) on a frame part (2, 3, 4) to be supported, wherein the component is at least substantially around the longitudinal axis of rotation (C) works; andmeans (72,82) for determining, based on at least the moment exerted by the payload on the frame member to be supported, a magnitude and direction of at least one support torque required to stabilize at least the frame member, and means for generating the required one Supporting torque and setting it to a predetermined size and direction with at least one actuator (6, 73, 83) for generating a total supporting torque having a magnitude and direction corresponding to the determined required supporting moment (T), a first one of the frame parts (2, 3, 4) of the forestry work unit (1) includes the frame part to be supported, on which the moment caused by the payload is mainly directed, and a second of the frame parts (2, 3, 4) includes a supporting frame part, to which the Payload induced moment is distributed and / or transmitted by a stabilization by produc ng of the required supporting torque (T) by the at least one actuator (6, 73, 83),
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