Steering system for working truck

Abstract

One of the mode lampsandof the mode indicatorcorresponding to the current steering mode is turned on yellow and the other mode lamps are turned on green or turned off, thereby indicating whether front wheelsand rear wheelsare at neutral. A controllerdoes not operate a mode changing valveeven with an instruction outputted from a mode change switchwhen the front and rear wheels are not at neutral, and operates, in response to an instruction outputted from the mode change switch, the mode changing valveto establish a steering mode corresponding to the instruction when the front and rear wheels are at neutral. Also, the mode indicatoris controlled to always indicate, as the current steering mode, one corresponding to the steering mode actually established by the mode changing valve. With those features, in a working vehicle in which the mode of steering front and rear wheels can be changed over between two-wheel steering and four-wheel steering, a steering system having superior operability and high reliability can be provided.