Abstract: The invention relates to a forest machine camprising a base (1) and a cabin (7), power source (8), loader (9) as well as a loading space (23) arranged thereto. The loading space is preferably arranged to form at the front end of the base a part connected with an articulated joint. In order to diversify the use of the forest machine, the cabin (7), loader (9) and power source (8) of the machine are arranged to be movable in relation to the base (1). Thus, depending on the location of the cabin, loader and the power source, the loading space in the machine is at least partly covered or released completely. A forest machine is thus provided that according to need is able to select between the most appropriate location of the centre of gravity and the use of the loading space (23).

Abstract: The present invention relates to a turning device for providing a rotational movement in a work machine so as to turn the work machine (8) quickly and smoothly. The turning device comprises a frame (1) in which is arranged at least one control rim (4) turning about the axis of rotation (6). To the control rim is arranged a swiveling axle (5) that projects substantially perpendicularly from the control rim, two pressure-medium-operated actuators (9, 10) at an angle with respect to one another are in turn arranged in the swiveling axle for turning the control rim about the axis of rotation. The actuators are double-acting actuators, whereby independent shuttle valves (28, 29) in the pressure line pairs (24, 25, 26, 27) applied to the actuator are arranged to regulate the pressure medium flow controlling the operation of the actuators.

Abstract: A loader composed of: a turntable (2) for connecting said loader to a machine base; a mounting plate (2a) connected to the turntable; a main arm (3) having a first end connected to the turntable; a secondary arm (4) articulated to the main arm (3); a lift cylinder (5) and a maneuvering cylinder (6) for controlling the arms, each of the cylinders having first and second ends, with the first end of the lift cylinder (5) being connected to the mounting plate (2a) and the first end of the maneuvering cylinder (6) being connected to the main arm (3) at a location proximate to the first end of the main arm (3); and a common link plate (9) to which the second end of the lift cylinder (5) and the second end of the maneuvering cylinder are connected in order to control the loader, wherein: the main arm (3), the lift cylinder (5) and the maneuvering cylinder (6) are situated substantially in the same shear plane; and the main arm (3) is positioned between each of the lift cylinder (5) and the maneuvering cylinder (6) a