First prepare a hard striker and hit the hollow shaft between the wheel plate and the axle, then knock out the small wheel shaft and replace the coupling wheel and the bearing. In this way, the replacement steps of the big wheel are equivalent to a little simpler. The snap ring can be directly knocked out and replaced by disassembling the snap ring with snap ring pliers. If the machine is rusted because it has not been replaced for a long time, it will take a little effort to slightly rust, but if it is seriously rusted, it will be broken by grinding machine.
The replacement and installation steps of the wheel are not so complicated. As long as the model of the wheel is found, the machine will be disassembled, and then the installation will be completed according to the original steps.