Basic structure/operating principle

There are two types of drive systems for these elevators: the direct type, where a plunger that extends or retracts through hydraulic pressure directly connects to a car to make it ascend or descend; and the indirect type, where the extending or retracting of the plunger pulls a rope that makes the car ascend or descend. The majority of the hydraulic elevators delivered in Japan are of the indirect type.
The equipment includes the hydraulic power unit, hydraulic jack and car. The installation of the hydraulic power unit can be performed in a relatively abundant form of layouts, and there is no need for a rooftop machine room.