CIRCUIT FOR TAKING OUT HYDRAULIC PRESSURE FOR IMPLEMENT FROM TRACTOR

摘要

PROBLEM TO BE SOLVED: To replace a second direction changeover valve for changing over a driving state of an implement driving actuator for driving the implement for a tractor with a simple and inexpensive valve and to reduce the cost of a circuit for taking out the hydraulic pressure for the implement in which the second direction changeover valve is integrated in the circuit for taking out the hydraulic pressure for the implement for driving the implement for the tractor. SOLUTION: First supply and exhaust passages 34 and 35 for connecting a first direction changeover valve 18 to a horizontal control cylinder 3 for a three-point supporting apparatus are arranged in series relatively to the first direction changeover valve 18 with the second direction changeover valve 32. Furthermore, the second direction changeover valve 32 is connected through second supply and exhaust passages 36 and 37 to a lifting arm driving cylinder 8 and the changeover operation of forward and return movements of the lifting arm driving cylinder 8 is performed with the first direction changeover valve 18. COPYRIGHT: (C)2006,JPO&NCIPI