Wheels are used to support the crane and the load, and back and forth on the track so that the crane operation with a device. The main damage is in the form of wheel wear, hardened layer crushing and pitting. Wheel material commonly used ZG430-640 steel. In order to improve the wear surface strength and durability of the wheel, the tread surface heat treatment should be carried out, the surface hardness of HB300-350, hardening depth of not less than 20mm crane wheels Group: Crane horizontal skew value of the wheel mechanism is important crane technology parameter, skew value will cause skew tolerance, increased running resistance, vibration and noise, increased rail and wheel wear and greatly reduce the life of the crane, so all kinds of crane manufacturing and technical conditions to be specified to allow the wheel horizontal deflection value.