Precise guide mechanism for ball bushing of hydraulic machine

The utility model discloses a precise guide mechanism for a ball bushing of a hydraulic machine, which comprises a fixed cross beam, a working table and a movable cross beam, the fixed cross beam and the working table are oppositely arranged up and down, the movable cross beam is connected between the fixed cross beam and the working table in a sliding manner, and precise guide structures for guiding are arranged among the fixed cross beam, the working table and the movable cross beam. According to the utility model, the two groups of side plates which are opposite left and right are respectively arranged between the fixed cross beam and the workbench, and the fixed cross beam is supported by the side plates, so that the four groups of upright posts do not need to bear the effect of supporting the fixed cross beam, and the risk of deformation is reduced; an inner fixing sleeve is arranged on the inner side wall of the outer fixing sleeve, a plurality of groups of steel balls protected by sheaths are arranged