Alcoa Wheel Service Manual For trucks, trailers, and buses. The Alcoa manual for professionals explains wheel service, including mounting and demounting of ball seat and hub pilot mount wheels. The manual uses graphics, theme headings and subject labels to guide the reader through blocks of information. This structure allows wheel service personnel to quickly find the specific facts they need and skim over what they don't. Other important reference text in the manual includes the Alcoa five-year limited warranty and safety regulations on servicing wheels.