Excavators

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.
• The other option is a hinge at the base of the boom allowing it to hydraulically pivot up to 180° independent to the house, however this is generally available only to compact excavators.