Hydraulic apparatus for agricultural vehicle

A hydraulic apparatus for an agricultural work vehicle, the hydraulic apparatus comprising:

• a hydraulic passage;
• an oil tank configured to store hydraulic oil supplied to the hydraulic passage;
• a hydraulic pump configured to supply the hydraulic oil to the hydraulic passage by pressing the hydraulic oil;
• an oil supply conduit disposed on the hydraulic passage, and configured to connect the oil tank and the hydraulic pump to each other;
• an oil return conduit disposed on the hydraulic passage, connected to the oil tank at one end thereof, and configured to guide the hydraulic oil, circulated through the oil supply conduit, to the oil tank;
• and
• an air drain conduit formed such that a first end of the air drain conduit is connected to the oil supply conduit and a second end of the air drain conduit, opposite to the first end, is connected to the oil return conduit, and configured to guide air, contained in the hydraulic oil flowing through the oil supply conduit, to the oil return conduit, wherein the air drain conduit is connected to an upper portion of the oil supply conduit based on a direction of gravity.