tools for loosening the earth 
Motorized machine that uses its rotating tines to turn over and loosen the soil and mix fertilizer into it.
Device converting the combustion of fuel and air into mechanical energy.
Cutting blade connected to a rotating axle; it digs into the soil to loosen it.
Hand-activated device pulling a cable to start the motor.
Metal structure of the tiller.
Lever controlling the tiller’s motion and the tines’ rotation.
Mechanism for selecting the direction in which the tiller moves.
Arm for steering the tiller.