A method assists during felling of a tree. The method includes the steps of: providing a property of the tree and/or a property of an environment of the tree; obtaining felling information related to an ideal felling direction of the tree based on the provided property; and outputting the obtained felling information.

Fully rotating rotary actuator of a multi-purpose machine in which an axle supports the frame of a felling head by a bearing mount, there being a rotary mechanism driven by a rotary motor between the axle and the frame, and in which the connection of the axle includes rotatable joints, the axle includes conduits for electrical cables and a processing fluid line, and in which an additive fluid line tube is arranged in the conduit in the axle and connected to its lower end is a rotatable connector, which is connected to a second tube fastened in the frame for the application of the additive fluid.

Fully rotating rotary actuator of a multi-purpose machine in which an axle supports the frame of a felling head by a bearing mount, there being a rotary mechanism driven by a rotary motor between the axle and the frame, and in which the connection of the axle includes rotatable joints, the axle includes conduits for electrical cables and a processing fluid line, and in which an additive fluid line tube is arranged in the conduit in the axle and connected to its lower end is a rotatable connector, which is connected to a second tube fastened in the frame for the application of the additive fluid.

A positioning system for attachment to a vehicle for operation of a power tool by a ground-based operator sitting in the vehicle provides a telescoping mast attached to the vehicle, a pivot bracket connecting an upper arm to the upper portion of the telescoping mast, mounting means for mounting the power tool on the upper arm; and power means for operating the power tool from the operator's position in the vehicle.

A cutting tool for clearing plant growth. The clearing tool includes a power transmission apparatus. An elongated part is coupled to the transmission to rotate around a longitudinal axis of the elongated part and having at least one thread that rises toward the transmission and the diameter of which decreases from an end of the elongated part coupled to the transmission to the end of the elongated part that is at a distance from the transmission. Guide parts are arranged around the elongated part to extend in the direction of the longitudinal axis of the elongated part. A blade part is arranged at the end of the elongated part coupled to the transmission. The elongated part, which, while targeted in a longitudinal direction toward the plant growth, is arranged to cut the plant growth when being rotated, wherein the threads transport the plant growth toward the blade part guided by the guide parts and cut the plant growth with the blade part.

A cutting tool for clearing plant growth. The clearing tool includes a power transmission apparatus. An elongated part is coupled to the transmission to rotate around a longitudinal axis of the elongated part and having at least one thread that rises toward the transmission and the diameter of which decreases from an end of the elongated part coupled to the transmission to the end of the elongated part that is at a distance from the transmission. Guide parts are arranged around the elongated part to extend in the direction of the longitudinal axis of the elongated part. A blade part is arranged at the end of the elongated part coupled to the transmission. The elongated part, which, while targeted in a longitudinal direction toward the plant growth, is arranged to cut the plant growth when being rotated, wherein the threads transport the plant growth toward the blade part guided by the guide parts and cut the plant growth with the blade part.

An implement system for a machine. The implement system includes a boom, an implement, a roller assembly and a carriage. The boom has a telescopic structure and a first end. The implement is coupled to the first end of the boom. The roller assembly is configured to be coupled to the machine. The carriage is engaged with the roller assembly and is coupled to the boom. The carriage is configured to move linearly along a longitudinal axis of the machine between a first position and a second position.

A hydraulic drive for feed rollers of a head of a complete timber harvester includes two radial piston motors coupled for conjoint rotation to the feed rollers. One radial piston motor has only one displacement volume and the other radial piston motor has two displacement volumes, between which it is possible to switch. A tree trunk clamped between the feed rollers can thus be moved at two speeds. At the higher speed, pressure medium circulates under a control pressure in the second displacement volume of the switchable radial piston motor.

A harvester that includes a harvester aggregate for felling, trimming and preparing tree trunks, a first measuring device provided in connection with the harvester aggregate for measuring of at least one dimension of a tree trunk. The harvester includes a second measuring device for measuring a feature of the first measuring device, whereby the feature is an attribute reflecting the capability of the first measuring device to measure the dimension correctly, and a control unit configured to make a comparison between an actual value of the measured feature and a target value of the feature, whereby the target value is indicative of a state of the first measuring device, where its measurement of the dimension is considered to be correct.

A harvester that includes a harvester aggregate for felling, trimming and preparing tree trunks, a first measuring device provided in connection with the harvester aggregate for measuring of at least one dimension of a tree trunk. The harvester includes a second measuring device for measuring a feature of the first measuring device, whereby the feature is an attribute reflecting the capability of the first measuring device to measure the dimension correctly, and a control unit configured to make a comparison between an actual value of the measured feature and a target value of the feature, whereby the target value is indicative of a state of the first measuring device, where its measurement of the dimension is considered to be correct.