Hydraulic Power Density
Hydraulic pumps, motors and cylinders are very power dense. This means that the amount of power they can absorb and transmit from a compact envelope give designers of machines the flexibility to locate the pumps and actuators in the most advantageous position.
As shown to the right, if you compare the size and weight of a diesel engine, electric motor and hydraulic motor each capable of delivering 100kW of power, the hydraulic motor is the most compact. It is also the most robust, suitable for hazardous environments and sealed against water and dust ingress.