Seamless steel pipe made of the head with the shaft, an interference fit onto the head of the shaft ends of the shaft is made from ductile cast iron body hole, the first wall of the shaft is provided with a fixing pin shaft, a hub fitted with end cap, wheel junction ends and cover seal groove, trough equipped with O-ring seals, bearings fitted in the head end of the shaft seal holder, seal seat in the circle with two seals, seal seat with screws one after oil pan, oil pan and fitted with wheels joint seals, oil pan drain line toward the dust cover fitted inside, the shaft ends equipped with head gear oil rubber, has opened a screw on cap, screw hole fitted plug.