In the present arrangement, a forest machine is controlled, which forest machine includes a body (2), a boom (3) in connection with the body (2) and a tool (4) at the end of the boom (3). A sensor (9) arrangement determines in advance the size of utilisable free space (11A, 11B) starting from the end of the boom (3). This determination consists of determining a direction and a length of the free space (11B). The operation of the tool (4) is allowed into the direction and for the length of the utilisable free space (11A, 11B) determined in advance.

A feed roller assembly of a harvester head of a forestry machine includes a pivoted arm operated by a hydraulic cylinder and a feed roller and one operating device attached to the pivoted arm having an attachment hub driving the feed roller, the feed roller includes at least one attachment flange, at least two toothed discs, spacer pieces between at least the attachment flange and the toothed discs, attachment bolts connecting the attachment flange, the toothed discs, and the spacer pieces to form the feed roller as a bolted construction, and a cleaning comb attached to the arm for cleaning gaps formed between each pair of components when the feed roller is rotating.

An excavator attachment apparatus includes a first fork configured to be removably attached to the distal end of a dipper arm of an excavator, wherein the first fork has an inner side and an outer side. The excavator attachment apparatus further includes a power saw, wherein the proximal end of the power saw is rotatably coupled to the outer side of the first fork. The excavator attachment apparatus further includes a hydraulic cylinder configured to rotate the power saw when the hydraulic cylinder is actuated. The excavator attachment apparatus further includes a second fork configured to be removably attached to the bucket link and distal end of the dipper arm of the excavator and actuated by the hydraulic bucket cylinder of an excavator to alternate between an open position and a closed position relative to the first fork.

A modular crawler-track unit for a forest machine has an engine, a chassis with a pivot bearing and a crawler-track frame. A sleeve shaft is attached to the crawler-track frame to support the crawler-track frame on the pivot bearing. A drive wheel is mounted in bearings in the crawler-track frame inside a circulation of a crawler mat. A support is arranged in the crawler-track frame inside the circulation to support a part of the crawler mat against the ground. A drive shaft is mounted in bearings in the crawler-track frame coaxially with the sleeve shaft to transmit power to the crawler-track unit. A shaft mounted in bearings on the crawler-track frame pivots the drive wheel to the crawler-track frame at a distance from the drive shaft. A power-transmission is fitted between the shaft and the drive shaft to transmit power from the drive shaft to the drive wheel.

A hoisting apparatus includes a rotation device with connectors for connecting pressure-medium lines to a rotation device, a boom, from which the pressure-medium lines are arranged to lead to the rotation device, and a pivoted joint for suspending the rotation device on the boom. The pivoted joint includes two consecutive pivots in a longitudinal direction of the rotation device. The rotational axes of the pivots are at right-angles to each other. The pressure-medium lines are routed between lugs of the pivot on a boom side of the pivoted joint, past the connectors of the rotation device in the longitudinal direction of the rotation device, to turn towards the connectors to form a hose loop and then routed to the connectors of the rotation device. The pressure-medium lines are arranged on both sides of the rotation device related to a plane defined in the longitudinal direction of the boom and the longitudinal direction of the rotation device.

A hydraulic assembly including a pivot connection defining a pivot axis, a hydraulic element linked to the pivot connection, and a connector for connecting a hydraulic conduit to the hydraulic element. The connector defines a connection axis and the connector is configured such that the connection axis approximately intersects the pivot axis. The hydraulic assembly may be used in various applications, including in forestry equipment, for example, with a rotator link assembly.

This invention relates to a vehicle sawhorse adjustable assembly that comprising of an adjustable wing structure operably adapted to provide a support to a plurality of logs in a longitudinally extended direction on a rear end of a cargo bed extension of a vehicle, a plurality of legs to provide an adjustable height using a plurality of holes in a vertically upward direction to the adjustable wing structure, a removable hitching unit to provide a base support to the adjustable wing structure in an adjustable horizontal direction and a hinge mechanism to connect the hitching unit with the plurality of legs and the adjustable wing structure. Further, the user can mount the assembly as an extension of a cargo-bed of a vehicle and insert structural material into the receptacles of the assembly.

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 winching apparatus adapted for horizontal rotational mounting behind the chipping feed rollers on a chipping machine. It has a rotatable vertical stanchion, that is pivotally coupled to first end of a horizontal boom arm that may be vertically adjusted between its ends so as to raise or lower its second end. At the second end of the boom arm is a swivel mounted plate that houses a high speed continual line uptake winch that is thus adjustable for simultaneous alignment of the rope puller with the line in both the horizontal and vertical planes. The device is capable of compensating for a constantly changing directional pull as well as feeding the downed foliage directly into the chipper.

A hydraulic control system for a work implement is provided. The hydraulic control system includes first hydraulic circuit and second hydraulic circuit. The first hydraulic circuit includes a selector valve and a pair of hydraulic cylinder assembly. Each hydraulic cylinder assembly includes a head end, a rod end, a cylinder, and a rod. The selector valve is configured to operate in neutral position and at least one operating position to selectively connect either the head end or the rod end to a fluid source, and the other of the head end or the rod end to fluid tank. The second hydraulic circuit includes a counterbalance valve and a shuttle valve. The counterbalance valve selectively connects the head end to the fluid tank. The shuttle valve is configured to maintain predefined pressure at relief side pressure port of the counterbalance valve to maintain a threshold pressure at the head end.