<P>PROBLEM TO BE SOLVED: To provide a hydraulic pressure-controlling circuit of a general-purpose combine harvester, enabling a stem culm-raking device for the combine harvester to be used in either of a raking reel or a row crop device by being readily recomposed. ??<P>SOLUTION: A hydraulic circuit 64 of the front part of a machine body is constituted by integrating hydraulic equipments for controlling the operations of a reel-lifting and lowering cylinder 14 for lifting and lowering the raking reel 12 installed in the front side of the machine body, and a second mower-lifting and lowering cylinder 66 for lifting and lowering a second mower for cutting unreaped stem culms. The hydraulic circuit 64 of the front part of the machine body is constituted so as to be properly exchangeable with the row crop hydraulic circuit 83 obtained by integrating the hydraulic equipments for controlling the operations of a left gauge wheel-lifting and lowering cylinder 81 and a right gauge wheel-lifting and lowering cylinder 82, for regulating the height of the row crop device 20. ??<P>COPYRIGHT: (C)2010,JPO&INPIT ??
