Most commonly used in the automotive industry Engine Cranes were designed to lift, transport and lower engines with a hydraulic boom while being supported by a set of sturdy legs that feature wheels fitted for ease of transport once the engine had been removed from the bay.
Firstly the engine should be freed from any securing bolts and screws, then it should be rigged up using an engine sling, the crane can then be brought in with the stand wheeled under the load (under the car) the crane boom can be lowered using the handle that operates the hydraulic ram.
Once lowered the chain sling should be connected to the crane hook, the engine can now be raised using the handle that operates the hydraulic ram, pumping the handle raises the load, once clear of the engine bay the load can be transported and worked on.
For safety reasons the crane boom can only operate in an vertical operation, this is why the sturdy legs are positioned under the load to prevent the Engine Crane from tipping over when lifting or transporting.