Abstract: A control valve device (19) controls supply and discharge of pressurized oil to and from a hoist cylinder (12) which tilts a vessel (3). A throttle (24C) that limits a flow rate of hydraulic oil which is discharged from a hydraulic pump (13) and flows in a return line (16) through a pump line (15), a first directional control valve (24) and a center bypass oil passage (23) is provided in the floating position (F) of the first directional control valve (24). When the first directional control valve (24) is in the floating position (F), the upstream side of the throttle (24C) is connected to the pump line (15), and the downstream side of the throttle (24C) is connected to the return line (16). In addition, a rod-side actuator line (18) communicated with rod-side oil chambers (12E, 12F) in the hoist cylinder (12) is connected to the pump line (15).

Abstract: A cooling air supply device (22) for supplying cooling air to an alternator (19) and an electric motor (20) for traveling is provided with a cooling air inlet port (24B) for taking in outside air as cooling air; a cooling air supply line (23) for establishing connection between the cooling air inlet port (24B), and the alternator (19) and the electric motor (20), and an alternator side cooling fan (36) and an electric motor side cooling fan (37) for sucking cooling air from the cooling air inlet port (24B) into the cooling air supply line (23). A dust separator (28) is provided in the halfway section of the cooling air supply line (23) to spirally circulate the cooling air and centrifugally separate the dust from the cooling air, and the dust in the cooling air is separated by the dust separator (28).

Abstract: A control valve device (19) controls supply and discharge of pressurized oil to and from a hoist cylinder (12) which tilts a vessel (3). A throttle (24C) that limits a flow rate of hydraulic oil which is discharged from a hydraulic pump (13) and flows in a return line (16) through a pump line (15), a first directional control valve (24) and a center bypass oil passage (23) is provided in the floating position (F) of the first directional control valve (24). When the first directional control valve (24) is in the floating position (F), the upstream side of the throttle (24C) is connected to the pump line (15), and the downstream side of the throttle (24C) is connected to the return line (16). In addition, a rod-side actuator line (18) communicated with rod-side oil chambers (12E, 12F) in the hoist cylinder (12) is connected to the pump line (15).

Abstract: A cooling air supply device (22) for supplying cooling air to an alternator (19) and an electric motor (20) for traveling is provided with a cooling air inlet port (24B) for taking in outside air as cooling air; a cooling air supply line (23) for establishing connection between the cooling air inlet port (24B), and the alternator (19) and the electric motor (20), and an alternator side cooling fan (36) and an electric motor side cooling fan (37) for sucking cooling air from the cooling air inlet port (24B) into the cooling air supply line (23). A dust separator (28) is provided in the halfway section of the cooling air supply line (23) to spirally circulate the cooling air and centrifugally separate the dust from the cooling air, and the dust in the cooling air is separated by the dust separator (28).