A tracked vehicle, controller for the tracked vehicle, and a method performed thereon are provided that enable the pilot to steer the tracked vehicle using an existing joystick of the tracked vehicle.

Each of left and right direction switching valves includes: a pump port connected to a pump; a first compensation port connected to an upstream side of a corresponding pressure compensation valve; a second compensation port connected to a downstream side of the corresponding pressure compensation valve; a pair of supply/discharge ports connected to a corresponding travel motor; and a communication port. The communication ports of the left and right direction switching valves are connected by a communication line. When a spool shifts from a neutral position by the travel operation device, the pump port communicates with the first compensation port and the second compensation port communicates with one of the supply/discharge ports and the communication port. Each direction switching valve is configured wherein a degree of communication between the second compensation port and communication port increases in a shifting amount of the spool from the neutral position.

A riding lawn care vehicle may include a frame, an engine, a steering assembly, a support platform and a front platform. At least a pair of drive wheels may be operably coupled to the frame. The engine is operably coupled to the frame via an engine platform. The engine is disposed between the drive wheels to selectively provide drive power to the drive wheels via respective hydraulic pumps. The steering assembly includes control levers operably coupled to respective drive wheels via the respective hydraulic pumps. The steering assembly enables steering of the lawn care vehicle based on drive speed control of the drive wheels responsive to positioning of the control levers. The support platform is operably coupled to the frame at a rear portion of the lawn care vehicle. The front platform is operably coupled to the frame forward of the engine platform. The front platform supports the hydraulic pumps.

A working machine includes a controller configured to determine a first deceleration threshold corresponding to each of a first traveling pressure, a second traveling pressure, a third traveling pressure, and a fourth traveling pressure, to perform automatic deceleration to reduce rotation speeds of a left traveling motor and a right traveling motor, and to judge whether to perform the automatic deceleration based on the determined first deceleration threshold, the first traveling pressure, the second traveling pressure, the third traveling pressure, and the fourth traveling pressure.

A tracked vehicle includes a pilot control module which enables the pilot to steer the tracked vehicle using an existing joystick of the tracked vehicle. The tracked vehicle also includes a dual track drive pedal which drives the tracks of the vehicle simultaneously. The joystick is used to make steering corrections when utilizing the dual track drive pedal.

A vehicle includes a rear steering system and a front differential hydraulic drive system. A first front drive control valve is operable to output a defined fluid flow in response to a steering command input. A second front drive control valve is operable to selectively divert a portion of the defined fluid flow output from the first front drive control valve. When the vehicle is operating in a pre-defined condition, a steering controller may control the second front drive control valve to divert a portion of the defined fluid flow from the first front drive control valve to define a reduced fluid flow, which is communicated to the front differential hydraulic drive system, to reduce a steering ratio of the front differential hydraulic drive system relative to the rear steering system, to desensitize steering provided by the front differential hydraulic drive system.

A work vehicle includes an engine mounted on a traveling body, a straight-traveling system transmission path including a first stepless transmission device, and a turning system transmission path including a second stepless transmission device, the work vehicle being configured to combine outputs of the straight-traveling system transmission path and an output of the turning system transmission paths to drive left and right traveling units. The work vehicle also includes control sections that control the outputs of the straight-traveling system transmission path and the output of the turning system transmission paths in cooperation with each other, a transmission operation tool that specifies the output of the straight-traveling system transmission path, and a detector that detects the output of the straight-traveling system transmission path. The control sections select one of an instruction value from the transmission operation tool and an actually measured value from the detector and set the output of the turning system transmission path.

A progressive brake steering system that includes a steering shaft, a steering arm attached to the steering shaft and a spring mechanism that couples the steering arm to a first actuation pushrod of a first brake master cylinder and a second actuation pushrod of a second brake master cylinder. Rotating the steering shaft in a first direction rotates a first side of the steering shaft towards a first spring of the spring mechanism to compress the first spring against the first actuation pushrod of the first brake master cylinder to generate a first brake fluid pressure. Rotating the steering shaft in a second direction rotates a second side of the steering shaft towards a second spring of the spring mechanism to compress the second spring against the second actuation pushrod of the second brake master cylinder to generate a second brake fluid pressure.

A working machine includes a hydraulic pump, a first traveling device to be driven by a first traveling hydraulic actuator, a second traveling device to be driven by a second traveling hydraulic actuator, a first output tube to connect a first output port of the hydraulic pump to the first traveling hydraulic actuator, a second output tube to connect a second output port of the hydraulic pump to the second traveling hydraulic actuator, a first operation device to operate the first traveling device, a second operation device to operate the second traveling device and a correction mechanism to equalize a driving force of the first traveling hydraulic actuator and another driving force of the second traveling hydraulic actuator when the first operation device and the second operation device are operated each at same operation extents to perform a straight-traveling operation.

An oscillation limited driven steering track assembly includes a track mechanism coupled to and driven by a hydraulic motor. The motor is pivotally secured about a steering axis to a stub axle which partially supports a land vehicle. A longitudinally extensible and retractable apparatus extends between the track mechanism and the stub axle. One end of the apparatus is pivotally secured to a post secured to and extending from the track mechanism parallel with the motor shaft axis of rotation. A yoke is provided between the apparatus other end and pivotally secures the apparatus to the stub axle about the steering axis and, also, about a pivot axis perpendicular to the steering axis. Oscillation of the track mechanism about the motor shaft is limited by the apparatus. Simultaneously, the apparatus does not interfere with the track mechanism while the mechanism is rotated about the steering axis for steering the vehicle.