Engine crane have been designed to lift and lower various kinds of heavy loads inclusive of car engines and transmissions. It would be pertinent to mention here that these large machines would help you lift various items along with a hook. The chains would be wrapped around the specific item to be lifted and would be connected to the lifting hook.
The hydraulic pump would raise the boom along with lowering it with ease. It would be pertinent to mention here that the hydraulic pump could have a single speed. It could also have dual speed. In the event of you using engine crane relatively more, your best bet would be dual speed crane, which is quicker of the two.