Ignition switch, for cranking your mower. Parking brake, usually has to be engaged to start the engine. Mower clutch, to engage the mowing blades. Deck height adjustment, to raise or lower the blade, depending on how high you want to cut your grass. Steering arms. These are the devices that replace your steering wheel to make your mower go forward, reverse, and turn. Check your machine before starting it. Here is a brief checklist to go over every time you use your machine. Check the fuel. Check the oil. Check the belts, pulleys, and blades to make sure they are free of debris and in good condition. Check the tires. This is critical with a ZTR mower, since the turning dynamics of this machine place a great deal of stress on the tires.