DEVICE OF CONTROLLING OPERATION OF JACK OF WORKING VEHICLE

PROBLEM TO BE SOLVED: To provide a device of controlling the operation of a jack of a working vehicle, capable of letting an operator place a plank underneath the jack without a shift in a short time and check the ground and an obstacle thereon.SOLUTION: The device 60 of controlling the operation of a jack attached to a vehicle 1 for a high lift work includes a plurality of outrigger jacks disposed on a car body to support the same by extending at least in the lower direction thereof, a jack-operating device 50 of operating the expansion/contraction of this jack, and a controller 61 that controls the expanding/contracting action of a plurality of jack cylinders 25 of the outrigger jacks according to the operation of the jack-operating device 50. The controller 61 suspends the extending operation of the jack cylinders 25 at a position thereof shortly before the ground is touched by each of the jack cylinders 25 if the operation of automatically extending the outrigger jacks is carried out by the automatic extension SW50a of the jack-operating device 50, and causes the jack cylinders 25 to extend by the subsequent operation of the automatic extension SW50a.