| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve efficiency of maintenance by making a hydraulic control block separable into small blocks. Ž<P>SOLUTION: The hydraulic control circuit is configured so that driving and braking of a left-side travel device are controlled by a left steering clutch cylinder 15L and a left travelling brake cylinder 18L and so that driving and braking of a right-side travel device are controlled by a right steering clutch cylinder 15R and a right travelling brake cylinder 18R. A left hydraulic control block 35L integrally incorporates the left steering clutch cylinder 15L, a left clutch switching solenoid valve 14L for controlling the left travelling brake cylinder 18L, a left pilot pressure switching solenoid valve 16L and a left electromagnetic proportional valve 17L. A right hydraulic control block 35R integrally incorporates the right steering clutch cylinder 15R, a right clutch switching solenoid valve 14R for controlling the right travelling brake cylinder 18R, a right pilot pressure switching solenoid valve 16R, and a right electromagnetic proportional valve 17R. The left hydraulic pressure control block 35L and the right hydraulic control block 35R are provided to be separated from each other. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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