Excavators are machines that are used mostly for construction activities. An excavator usually consists of an undercarriage, boom stick, bucket and house. A motor is located near the undercarriage with gears that aid in the movement of this particular piece of equipment.
The house is where the engine, fuel cylinders and oil reside. It is the house that connects the under carriage via the cylindrical casket enabling it to move at a 360 degree circular angle. A boom attached to the stick is used to mainly lift up the bucket. In the old days excavators had a counter weight that was situated at the rear of the machine that assisted with lifting and dragging.