Another type is the hydraulic system, which saves a lot of energy and goes a long way. In the case of mitsubish 8M21 with hydraulic system, it saves a lot of energy and is used in normalized heavy vehicles. For instance, the pressure of the piston is advised by advisedement and the use of the all-terrain vehicle.
They are also easier to maintain, and have more maintenance. Another type is Mitsubish 8M21 which is a type of heavy-duty excavator.