FIRST THING TO DO....UNPLUG THE MACHINE.
After that, remove the top 2 screws from the cover from between the washing machine and the dryer and remove cover. Then remove the 2 screws from the top of the front dryer cabinet, pull front cover out slightly and gently let it lay forward. From this point, you can look in and see the drum rollers. behind the rollers on the roller shaft is a 1/2" nut. Use a 1/2" gearwrench to remove the nut, and pull the shaft with roller attached out forward. use snap ring pliers to remove snap ring, take off old roller with bushings, and replace with new. To re-install shaft with new roller, you will have to lift the drum slightly to give yourself enough room.Re-assemble the front of machine (NOTE: Be careful of the wiring on the control panel, as some connectors may have pulled loose. Make sure they are all connected before replacing front of machine). Plug machine in and test it out. While you have the machine open, use a good vacuum cleaner and remove the lint that you will find inside the machine.Depending on how old the machine is, you should find quite a bit.