| 摘要 |
<p>PURPOSE:To improve the operation performance of a PTO clutch by installing a boost controlling mechanism with which semiclutch state and clutch connection state can be switched, into the hydraulic circuit for the PTO clutch and permitting the clutch connection state to be indicated. CONSTITUTION:In a discharged-oil passage of a hydraulic pump 1, a flow device 2 in which a pressure adjusting valve 9 is installed in an oil passage 6 which communicates to a lift cylinder 5 and a shunt valve 10 and a clutch valve 11 are installed in an oil passage 8 which communicates to a PTO-clutch cylinder 7 is installed. In semiclutch connection, a PTO switch S3 which constitutes a boost controlling mechanism 25 with the flow device 2 is turned ON, and an operation lever 14 is turned gradually to a clutch connection position H. Therefore, an arm 16c is gradually turned through a spring 18, in order to press a spool 10a, and the pressurized oil gradually boosted is supplied into the cylinder 7. Further, when a clutch 24 is connected at a time, the connecting lever 14 is set at connection position H, and the switch S3 is operated to be turned ON.</p> |
