Hitachi Construction Machinery Co., Ltd.

Kensuke Satou

Tsukasa Toyooka

Makoto Sugaya

Tsuyoshi Nakamura

Tsutomu Udagawa

Eiji Egawa

Akira Nakayama

Makoto Matsushita

Kazuo Takiguchi

Yuuji Nagashima

Hideo Sorata

A travel control device for a work vehicle includes: a hydraulic pump; a plurality of hydraulic motors connected to the hydraulic pump in parallel through a closed-circuit connection, that drive different wheels with pressure oil delivered from the hydraulic pump; a slip detection device that detects a slip occurring at each of the wheels; and a flow control device that reduces, upon detection of a slip occurring at any of the wheels by the slip detection device, a quantity of pressure oil supplied to a hydraulic motor for driving the wheel at which the slip has been detected, among the plurality of hydraulic motors.

Travel control device for work vehicle and work vehicle

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.

Steering system for working truck

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Ushiku, Japan

Kensuke Satou