A hydraulic wood splitter is disposed which includes a mounting arrangement for effecting a fixed connection to a tractor or the like, and vertically positionable wood supporting frame adapted to be moved vertically with respect to the mounting arrangement. A four-bar linkage arrangement is provided to accommodate selective vertical positioning of the splitter's frame, with a locking arrangement provided for selectively locking the frame at any desired elevation. The splitter further includes a self-elevating mechanism which is adapted for operative association with the splitter's hydraulic actuator for effecting raising and lowering of the wood supporting frame. Notably, the mounting arrangement of the present splitter is adapted to permit the splitter to be mounted on different tractors having attachment points at differing heights, with the splitter still being mounted at the same relative elevation with respect to the ground.