A vehicle having a long track or wheel-trail wheel combination on one side and a smaller ground engaging member, such as a short track or wheel on the other. The vehicle has a work attachment on one end of its frame, which is provided clearance on the side of the vehicle with the short track or wheel. A control system is provided to allow an operator to properly control a direction of the vehicle despite the fact that different forces may be required to operate the long track and the short track or wheel.

A working machine is provided, which includes a prime mover, a first traveling pump driven by power of the prime mover to supply operation fluid through a connector fluid tube, a traveling motor including first and second ports connected to the connector fluid tube, the traveling motor configured to be switched in a first speed and a second speed higher than the first speed, a first pressure detector to detect first traveling-pump pressure near the first port, a second pressure detector to detect second traveling-pump pressure near the second port, and a controller configured, with the traveling motor switched in the second speed, to automatically shift down the traveling motor from the second speed to the first speed, when a differential pressure between the first traveling-pump pressure and the second traveling-pump is equal to or more than a deceleration threshold.

A working machine is provided, which includes a prime mover, a first traveling pump driven by power of the prime mover to supply operation fluid through a connector fluid tube, a traveling motor including first and second ports connected to the connector fluid tube, the traveling motor configured to be switched in a first speed and a second speed higher than the first speed, a first pressure detector to detect first traveling-pump pressure near the first port, a second pressure detector to detect second traveling-pump pressure near the second port, and a controller configured, with the traveling motor switched in the second speed, to automatically shift down the traveling motor from the second speed to the first speed, when a differential pressure between the first traveling-pump pressure and the second traveling-pump is equal to or more than a deceleration threshold.

A travelling frame of a travelling device positioned between a center frame and a travelling motor attachment portion includes an upper plate extended toward the center side of the vehicle to form an extended portion. A long hole into which travelling motor hydraulic piping is inserted is formed in the upper plate along the extended portion. The travelling motor hydraulic piping extends from a lead-out hole opened in an end plate of the center frame, through the long hole of the upper plate and a long hole opened in an end plate, and inserted into the travelling motor attachment portion.

A travelling frame of a travelling device positioned between a center frame and a travelling motor attachment portion includes an upper plate extended toward the center side of the vehicle to form an extended portion. A long hole into which travelling motor hydraulic piping is inserted is formed in the upper plate along the extended portion. The travelling motor hydraulic piping extends from a lead-out hole opened in an end plate of the center frame, through the long hole of the upper plate and a long hole opened in an end plate, and inserted into the travelling motor attachment portion.

The power-transmission device has an input shaft, an output shaft, a gear mechanism, and a motor. The gear mechanism includes a plurality of planetary gear mechanisms and a mode-switching mechanism, and transmits the rotations of the input shaft to the output shaft. The mode-switching mechanism selectively switches the drive-power transmission path of the power-transmission device between a plurality of modes. The motor is connected to the rotating elements of the planetary gear mechanisms. A target-input-torque determination unit determines the target input torque, which is a target value for the torque to be inputted to the power-transmission device. The target-output-torque determination unit determines the target output torque, which is a target value for the torque to be outputted from the power-transmission device. The command-torque determination unit uses the torque balance information to determine torque commands to the motor from the target input torque and the target output torque.

Utility vehicle power machines with a frame, single left and right side tracks or tractive elements, a cab, a box supported toward the rear of the frame, and a lift arm supported toward the front of the frame. The utility vehicle power machines can have removable covers on a front of the frame, forward of the cab to provide access to various components.

Utility vehicle power machines with a frame, single left and right side tracks or tractive elements, a cab, a box supported toward the rear of the frame, and a lift arm supported toward the front of the frame. The utility vehicle power machines can have removable covers on a front of the frame, forward of the cab to provide access to various components.

A track roller includes a roller shell, a first retainer, a second retainer, a first holding ring, and a second holding ring. The first retainer is press-fitted to the outer periphery of a shaft and abuts on a first end face of the roller shell. The second retainer is press-fitted to the outer periphery of the shaft and abuts on a second end face of the roller shell. The first holding ring is attached to the outer periphery of the shaft on the outside of the first retainer and fixes the first retainer. The second holding ring is attached to the outer periphery of the shaft and fixes the second retainer.

A track roller includes a roller shell, a first retainer, a second retainer, a first holding ring, and a second holding ring. The first retainer is press-fitted to the outer periphery of a shaft and abuts on a first end face of the roller shell. The second retainer is press-fitted to the outer periphery of the shaft and abuts on a second end face of the roller shell. The first holding ring is attached to the outer periphery of the shaft on the outside of the first retainer and fixes the first retainer. The second holding ring is attached to the outer periphery of the shaft and fixes the second retainer.