| 摘要 |
<p>A pair of dozer control valves (V3,V6) concurrently operable; a pilot pressure valve (V14) switchable between an independent position (27) where, when only track devices (5) are operated, discharged fluid from one hydraulic-fluid discharge port (P1) is independently supplied to one track control valve and one dozer control valve, and discharged fluid from the other hydraulic-fluid discharge port (P2) is independently supplied to the other track control valve and the other dozer control valve, and a merging position (28) where, when the other control valves are operated, discharged fluid from the one hydraulic-fluid discharge port and from the other hydraulic-fluid discharge port are merged and supplied to the control valves (V1 to 10) ; and pressure compensation valves (V11) in the control valves and for distributing hydraulic fluid at flow rates based on extent of actuation of the other control valves operated, irrespective of the magnitude of the loads.</p> |
