This detailed engineering drawing depicts a complete 200mm diameter crane wheel assembly system with both driving and trailing wheel configurations. The assembly incorporates phosphor bronze coated C55Mn75 IS:1570 wheels (200mm diameter) mounted on EN9 steel axles with a heat-treated tread and flange hardened to 200 BHN minimum. The system features 22210 bearings housed in MS axle boxes with appropriate bearing covers. Key dimensions include 230mm outer diameter wheel flanges, 55mm diameter axle journals, and 110mm PCD for the bearing cover mounting holes. The design specifies two driving wheel assemblies per crane (one as assembled, one opposite hand) and two non-driving wheel assemblies, indicating a four-wheel crane configuration. The drawing includes multiple detailed sections showing critical interfaces, bearings, spacers, and axle bars with precise tolerances. Material specifications for components include MS (mild steel) for bearing covers, axle boxes and spacers, while driving and trailing axles are manufactured from EN9 steel. The comprehensive assembly incorporates greasing points via 1/8″ BSP ports for maintenance accessibility.