Never remove any screw unless you are instructed to do so.
Handles and levers
Purple handles and levers are for pulling or lifting parts when you move or remove them. Purple labels on parts indicate exactly where to hold the parts when pulling or lifting them.
Screws
Replaceable components are secured with black screws. Never remove screws that are not black.
The hex screwdriver is used to clench the heads of screws, so that they do not drop into the machine during removal.