lawn tractor 
Small motorized vehicle upon which a mower deck is fixed, for cutting large expanses of grass.
steering wheel 
Circular instrument used by the operator for steering the front wheels.
ignition key 
Part that is inserted into the ignition switch to start or stop the motor.
brake pedal 
Lever that the operator presses with the foot to activate the brake system.
rear wheel 
Circular part rotating around an axle upon which a device rests; in this case, the rear of the vehicle. Its rear wheels are the driving force.
forward travel pedal 
Lever that is held down to let the vehicle go forward.
mower deck 
Mobile structure supporting and covering one or more rotating blades that cut the grass.
front wheel 
Circular part rotating around an axle upon which a device rests; in this case, the front of the vehicle. Its front wheels guide the lawn tractor.
gauge wheel 
Small adjustable wheel following the contours of the terrain to give a uniform cut over uneven surfaces.