| 摘要 |
The structures of oil paths and switching control of a mechanical selector valve for controlling a hydraulic actuator and the cost of parts of the mechanical selector valve are respectively simplified and reduced to levels not achievable by an electromagnetic selector valve. However, simple and quick switching operation of the mechanical selector valve by the use of a nearby switch which requires small force to actuate is difficult, and this makes the mechanical selector valve less easy to operate than the electromagnetic selector valve. A selector valve operating mechanism (110) is provided with operating pistons (176, 179) which are hydraulic pistons connected through an operation link (161) to a spool (145) of a PTO selector valve (240), an solenoid valve (113) for hydraulically controlling reciprocation of the operating pistons (176, 179), and a controller (123) which is a control device for transmitting an operation signal to the solenoid valve (113). Control of operation of the solenoid valve (113) moves the spool (145) through the operating pistons (176, 179) and the operation link (161) to switch the PTO selector valve (240).
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