Abstract: A tilt-up mechanism for tilting up an upper column of a steering column from a drive position to a tilt-up position is configured independently from a tilt angle adjusting mechanism and a column length adjusting mechanism. When an operator who is to get on/off an operator's seat steps on and operates a pedal of the tilt-up mechanism, an engaged state of a lock pin with respect to a tilt-up member is disengaged. The tilt-up member is rotated around a support shaft, by a spring force of a tilt-up spring, whereby the upper column is tilted up together with a steering wheel in a direction (A) away from the operator's seat. At this time, the tilt angle and the column length can be held at positions adjusted in advance.

Abstract: A work vehicle control device includes: a rotation speed control unit that controls an engine rotation speed in correspondence to an accelerator pedal operation quantity indicating an operating extent of an accelerator pedal; a speed ratio detection unit that detects a ratio of speed at an input shaft and at an output shaft of a torque converter, which is disposed between the engine and wheels; a decision-making unit that makes a decision that a fuel efficiency deteriorating condition exists if the torque converter speed ratio is less than a predetermined value or if the torque converter speed ratio is equal to or greater than the predetermined value and a target engine rotation speed corresponding to an operation of the accelerator pedal is greater than a preset value; and an informing unit that informs results of the decision made by the decision-making unit.

Abstract: A tilt-up mechanism for tilting up an upper column of a steering column from a drive position to a tilt-up position is configured independently from a tilt angle adjusting mechanism and a column length adjusting mechanism. When an operator who is to get on/off an operator's seat steps on and operates a pedal of the tilt-up mechanism, an engaged state of a lock pin with respect to a tilt-up member is disengaged. The tilt-up member is rotated around a support shaft, by a spring force of a tilt-up spring, whereby the upper column is tilted up together with a steering wheel in a direction (A) away from the operator's seat. At this time, the tilt angle and the column length can be held at positions adjusted in advance.

Abstract: A wheel loader includes a vehicle body having wheels a work implement including an arm, a bucket, and an arm cylinder and a bucket cylinder that drive the arm and the bucket, respectively, and a work implement control device that directs an operation of the work implement. The work implement control device includes an arm control lever disposed on the right of a driver's seat, the arm control lever controlling operations of the arm, and two kickdown switches disposed at an upper surface and a left side surface, respectively, of a grip of the arm control lever. Operability can thereby be improved even further.

Abstract: A work vehicle control device includes: a rotation speed control unit that controls an engine rotation speed in correspondence to an accelerator pedal operation quantity indicating an operating extent of an accelerator pedal; a speed ratio detection unit that detects a ratio of speed at an input shaft and at an output shaft of a torque converter, which is disposed between the engine and wheels; a decision-making unit that makes a decision that a fuel efficiency deteriorating condition exists if the torque converter speed ratio is less than a predetermined value or if the torque converter speed ratio is equal to or greater than the predetermined value and a target engine rotation speed corresponding to an operation of the accelerator pedal is greater than a preset value; and an informing unit that informs results of the decision made by the decision-making unit.

Abstract: A joint pin lock system or mechanism for a pivotal pin joint which connects one mechanical structural member between a pair of bracket portions of another mechanical structural member pivotally relative to each other by means of a joint pin passed through a connecting end portion of one mechanical structural member and the bracket portions of the other mechanical structural member.

Abstract: When an arm end exceeds a boundary line K2 and enters a slowdown area R1, a proportional solenoid pressure reducing valve 13 is operated to reduce a pilot pressure for slowing down a first boom cylinder 1A, thereby slowing down an arm end speed. When the arm end exceeds a boundary line K1 and enters a restoration area R2, a restoration gain is calculated in control gain block 200 depending on an intrusion amount by which the arm end enters the restoration area, while a feedback gain is calculated depending on an arm end speed at that time on the basis of functions 204, 205, 206, 207, 208 and 209. In accordance with these gains, a second boom 2 is automatically dumped depending on the intrusion amount of the arm end into the restoration area and the arm end speed at that time so that the arm end is moved for return to the slowdown area. As a result, such work as requiring a work front to be moved toward the operator is continuously smoothly performed and working efficiency is improved.

Abstract: Arranged on a side of a first pump are a flow control valve for controlling a first boom cylinder, a flow control valve for an arm, said flow control valve being connected in tandem with said flow control valve and being adapted to control an arm cylinder, and a flow control valve for a second boom, said flow control valve being connected to a downstream side of the flow control valve and being adapted to control a second boom cylinder.

Abstract: A pump controller (40) calculates a pump maximum absorbing horsepower and a pump required horsepower based on an accelerator signal, a pump delivery pressure and an operation signal, determines an engine required horsepower (PN) by selecting minimum one of both horsepower values, and calculates a pump required revolution speed based on the accelerator signal, the operation signal and an engine revolution speed signal to determine an engine required revolution speed (NN). The engine controller (40) determines, from the engine required horsepower (PN), a required-horsepower-referenced target engine revolution speed (NK) at which a fuel consumption rate is minimized, and selects larger one of the engine required revolution speed (NN) and the target engine revolution speed (NK) as an engine target revolution speed (NZ) to control an injected fuel amount and fuel injection timing, thereby controlling an engine torque and an engine output revolution speed.