the scope of the maintenance contract signed with Siemens Turkey 5 MW Siemens steam turbine major maintenance was completed in Siemens and Izaydaş supervisor. Our operations are summarized below: Disassembly, maintenance and installation of steam turbine control and regulating valves, 4th and 5th stage rotor blade spacing sandblasting, replacement of pinion and big gear bearings, disassembly of insulation bearings, replacement with new ones, maintenance of rotor, disassembly and replacement of required axial bearings with new ones