A construction equipment, comprising: first, second, and third variable displacement hydraulic pumps (50; 51; 69) connected to an engine; a first traveling control valve installed in a first center bypass path of a first hydraulic pump to control the start, stop, and direction change of a left traveling motor ; first control valves installed in the first center bypass path on a downstream side of the first traveling control valve and connected together through a first parallel line to control hydraulic fluid being supplied to a boom cylinder , a swing motor , and an arm cylinder ; a second traveling control valve installed in a second center bypass path of a second hydraulic pump to control the start, stop, and direction change of a right traveling motor ; and second control valves installed in the second center bypass path on a downstream side of the second traveling control valve and connected together through a second parallel line to control hydraulic fluid being supplied to the boom cylinder , a bucket cylinder , and the arm cylinder ; and characterized by a first path connected to a discharge flow path of the third hydraulic pump and connected to the first and second center bypass paths of the first and second hydraulic pumps (50; 51) on the downstream sides of the first and second traveling control valves (54; 62) through first and second check valves (82; 83), respectively; and a second path connected to the discharge flow path of the third hydraulic pump and connected to the first and second parallel lines of the first and second hydraulic pumps (50; 51) on the downstream sides of the first and second traveling control valves (54; 62) through third and fourth check valves (85; 86), respectively. first, second, and third variable displacement hydraulic pumps (50; 51; 69) connected to an engine; a first traveling control valve installed in a first center bypass path of a first hydraulic pump to control the start, stop, and direction change of a left traveling motor ; first control valves installed in the first center bypass path on a downstream side of the first traveling control valve and connected together through a first parallel line to control hydraulic fluid being supplied to a boom cylinder , a swing motor , and an arm cylinder ; a second traveling control valve installed in a second center bypass path of a second hydraulic pump to control the start, stop, and direction change of a right traveling motor ; and second control valves installed in the second center bypass path on a downstream side of the second traveling control valve and connected together through a second parallel line to control hydraulic fluid being supplied to the boom cylinder , a bucket cylinder , and the arm cylinder ; and characterized by a first path connected to a discharge flow path of the third hydraulic pump and connected to the first and second center bypass paths of the first and second hydraulic pumps (50; 51) on the downstream sides of the first and second traveling control valves (54; 62) through first and second check valves (82; 83), respectively; and a second path connected to the discharge flow path of the third hydraulic pump and connected to the first and second parallel lines of the first and second hydraulic pumps (50; 51) on the downstream sides of the first and second traveling control valves (54; 62) through third and fourth check valves (85; 86), respectively. <EOS>