Main shaft fixture

A main shaft fixture (10) for fixation of a main shaft (4) on a wind turbine during execution of installation and repair work on heavy parts of a wind turbine, where the fixture (10) is divided up into a number of sections for mounting on stable structural parts (2) in a nacelle in a wind turbine, including the bottom frame (2) of the nacelle, wherein the main shaft fixture (10) comprises at least three radially displaceable pressure mandrels (18), substantially symmetrical located around a centre axis (11) of the main shaft, first ends of said pressure mandrels (18) face the main shaft (4) and are furnished with a tap shoe (20), and wherein said pressure mandrels (18) are displaceable between a passive, withdrawn lockable position where the tap shoes (20) are configured to be located at a distance from the surface of the main shaft (4) and an advanced lockable position where the tap shoes (20) are configured to be engaged with the main shaft (4), further comprising a rotor lock (24) for fixation of the rotor (8) of the wind turbine, further comprising one of a multi-part needle bearing, roller bearing, or ball bearing (46) comprised of a multi-part inner ring (48) fastened to the main shaft (4), and a therewith cooperating multi-part outer ring (50) comprised of bowed sub-segments (52) corresponding to the number of tap shoes, mounted on the opposing side of the tap shoes (20) facing the inner ring (48), which in the advanced active position of the pressure mandrels form the outer ring (50) at a distance from the outer periphery of the multi-part inner ring (48), and where a plurality of needle rollers, rollers, or balls (54) are arranged between the inner ring (48) and the outer ring (50), and where means are present for retaining the needles, rollers, or balls (54) in position between the inner ring (48) and outer ring (50).