Patent attributes
A hydraulic machine includes a tank; a working device including a boom; a boom cylinder which operates the boom and has a large chamber and a small chamber; a floating hydraulic circuit connected to the large chamber, the small chamber, and the tank so as to enable the large chamber, the small chamber, and the tank to communicate with each other; and an operator input device for receiving, from a driver, a request for turning on or turning off the floating hydraulic circuit. In the case of a boom down operation for lowering the boom, it is determined whether the working device floats in the air, and when it is determined that the working device floats in the air, the floating hydraulic circuit can be turned off, even if the request for turning on the floating hydraulic circuit is input to the operator input device.
