An image forming apparatus includes a fixing unit for fixing a toner image on a recording sheet. In one embodiment, a method of coating a surface of an object includes forming a plasma in a cavity by subjecting a gas to electromagnetic radiation in the presence of a plasma catalyst and adding at least one coating material to the plasma by energizing the material with, for example, a laser. Thereafter, when the starting clutch receiving a hydraulic pressure from the hydraulic pump starts its engagement, the power-transmission control system starts the operation of the engine. The gauge senses a selected gas pressure in an inlet corresponding to the selected gas storage container and visually indicates a pressure of that gas storage container. The locking devices engage the pair of expansion sleeves causing the expansion sleeves to expand to secure the axis member in a pair of mounting lugs.