Excavators

The two main sections of an excavator are the undercarriage and the house. The undercarriage includes the blade (if fitted), tracks, track frame, and final drives, which have a hydraulic motor and gearing providing the drive to the individual tracks, and the house includes the operator cab, counterweight, engine, fuel and hydraulic oil tanks. The house attaches to the undercarriage by way of a center pin, allowing the machine to slew 360° unhindered.
The main boom attaches to the house, and can be one of 3 different configurations:
• Most are mono booms: these have no movement apart from straight up and down.
• Some others have a knuckle boom which can also move left and right in line with the machine.