What components are in the wire feed drive assembly?

The wire feed drive assembly contains a wire drive motor, machined drive housing, pressure roll lever, drive roll carriers, tension adjustment knob, clevis pins, spring pins, and various screws and washers. It also includes the wire inlet guide and drive rolls for feeding wire at the correct speed. (Page 8-9)

From the official Miller Matic 255 MIG Welder manual, page 8

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