COMBINED STEERING GEAR OIL TANK

A complex steering gear oil tank is provided to reduce the cost for installing a platform, a ladder, and various support structures by integrating a first tank and a second tank. A complex steering gear oil tank includes a first tank(101), a lever detector(103), a second tank(151), a first pipe line(111), a second pipe line(121), and a pump(113). The first tank is disposed above an oil suction point of a steering gear by a predetermined distance to keep a working fluid. The level detector is installed in the first tank to detect lack of the residual working fluid in the first tank and warn a user of lack of the working fluid. The second tank is coupled to a lower surface of the first tank to keep the working fluid to be supplemented when the working fluid in the first tank is not sufficient. The first pipe line is installed between the first tank and the second tank to supply the working fluid in the second tank to the first tank. The second pipe line is installed between the first tank and the second tank to supply the surplus working fluid in the first tank to the second tank. The pump is installed on the first pipe line to feed the working fluid to be supplemented to the first tank from the second tank. The first tank is connected to a supply pipe and a recovering pipe. The first tank and the second tank are integrated to form a multi-layer.