摘要:
A work vehicle is provided with an engine, a traveling device, driven by driving force from the engine, that causes the vehicle to travel, a first hydraulic pump driven by the driving force from the engine, that discharges hydraulic oil, and a cooling device driven by the hydraulic oil supplied by the first hydraulic pump, that cools the engine, and a control unit. The control unit performs normal cooling control and cooling suppression control for suppressing operation of the cooling device to be less than the normal cooling control. The control unit performs the cooling suppression control when one of a first mode to fourth mode required to increase the engine speed is performed.
摘要:
A tank 16 and a main hydraulic pump 17 are connected to head side actuator chambers 13 and rod side actuator chambers 14 of hydraulic actuators 12 via conduits 21, 22. A direction control valve 18 and a quick drop valve 36 are connected to the conduits 21, 22. A hydraulic circuit is provided with an electromagnetic switch valve 42, which switches the quick drop valve 36 from a non-quick drop position 37 to a quick drop position 38. When switching the direction control valve 18 from a neutral position 23 to a lowering operation position 25, if the manipulation speed of a manipulation lever 33 exceeds a criteria speed, an excitation signal is output from a control device 32 to an electromagnetic switch valve 42 to quickly drop a blade 11, and the quick drop valve 36 is switched from the non-quick drop position 37 to the quick drop position 38.