(57) The present disclosure relates to a hydraulic system for construction machinery.
According to the hydraulic system for construction machinery according to the exemplary
embodiment of the present disclosure, during a traveling mode, hydraulic oil discharged
from a first main pump (11) merges with hydraulic oil discharged from a second main
pump (12), and the merged hydraulic oil is provided to a traveling motor (80), thereby
improving traveling performance. In addition, according to the hydraulic system for
construction machinery according to the exemplary embodiment of the present disclosure,
even in a situation in which the first and third control valve units (51, 53) cannot
be normally controlled for an unknown reason, the overspeed traveling may be prevented
by restricting a maximum discharge flow rate of the first main pump (11) in the traveling
mode, thereby ensuring traveling performance and preventing durability of a traveling
system from deteriorating.
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