| 摘要 |
A fluid-pressure transmitting apparatus is provided which is capable of securing the operationality of a working machine and braking and preventing against engine stall. Furthermore, a fluid-pressure transmitting apparatus is provided which makes it possible to switch over, in arrangement relationship, between a working-machine operating device and a traveling operating device. When a second operating unit is operated during operation of a first operating unit, the pilot pressurized oil outputted from each operating means through first and second pilot-pressure admission passages is admitted to a low-pressure selecting valve. At this time, when the pilot pressurized oil to be admitted to the second pilot pressure admission passage is lowered, it is automatically selected through the low-pressure selecting valve to control the delivery capacity of the traveling pump and braking and preventing engine stall and realizing travel at low speed. The low-pressure oil is admitted to a pump capacity control device of the traveling pump to control the delivery capacity of the traveling pump, realizing traveling at low speed. If operating a single operation-pattern switching valve, the input port of the pilot-pressure admission passage for an arm valve can be switched to connect with the output port of the first pilot-pressure admission passage for the low-pressure selecting valve, and the input port of the first pilot-pressure admission passage be switched to connect with the output port of the driving pilot-pressure admission passage. Thus, the both pressurized-oil passage of the operation lever can be simply switched in connection.
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