The present invention partly relates to an arrangement and partly a bearing arrangement (10) that can be turned by an assigned hydraulic pressure and flow, which bearing arrangement is related to a chain saw arrangement (101:1), which is supported by a harvesting unit (100) for crosscutting of timber (103) and the like, wherein the bearing arrangement (10) is arranged for said chain saw and is oriented between a guide bar housing (2') for the chain saw and the chain saw's drive motor unit (3), wherewith an oscillatory (or swinging) motion ("S") can be activated by a hydraulic control valve (36), through which the hydraulic flow is alternatively controlled via feed or connection lines (13a, 13b) to said bearing arrangement (10), for a first or second function or operating mode ("R1"； "R2"). The invention provides, more specifically, that said arrangement (10) is activated via hydrostatic pressure and coordinated on the one hand with the guide bar housing (2'), and on the other hand with a drive motor unit (3) or similar device, via surrounding perforated discs (11, 12, 13, 14) that are oriented in parallel and aligned around an axis of rotation (15') for a drive shaft. The hydrostatic pressure is able to affect the arrangement's oscillatory motion ("S") for a reciprocal motion pattern, while, at the same time, the spent hydraulic oil will serve as a lubricating film between the opposing sliding or bearing surfaces (110-116).La présente invention concerne en partie un agencement et en partie un agencement de palier (10) qui peut être mis en rotation grâce à une pression et un écoulement hydrauliques attribués, l'agencement de palier étant associé à un agencement de scie à chaîne (101:1), qui est supporté par une unité de récolte (100) pour le tronçonnage de bois (103) et analogue. Selon l'invention, l'agencement de palier (10) est conçu pour ladite scie à chaîne et est orienté entre un logement de barre de guidage (2') pour la scie à chaîne et l'unité motorisée d'entr
