Working machine

A working machine comprising:

• a prime mover;
• a first traveling pump driven by power of the prime mover to supply operation fluid through a first connector fluid tube;
• a first traveling motor including first and second ports connected to the first connector fluid tube, the first traveling motor configured to provide the power to a first traveling device by the operation fluid supplied from the first traveling pump, and 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 of the operation fluid in the first connector fluid tube near the first port;
• a second pressure detector to detect second traveling-pump pressure of the operation fluid in the first connector fluid tube near the second port;
• and
• a controller configured, with the first traveling motor switched in the second speed, to automatically shift down the first traveling motor from the second speed to the first speed, when a first absolute value of a first differential pressure between the first traveling-pump pressure and the second traveling-pump pressure is equal to or more than a deceleration threshold, wherein
• the controller is configured, after the first traveling motor is shifted down from the second speed to the first speed, to automatically shift up the first traveling motor from the first speed to the second speed, when the first absolute value is equal to or less than a return threshold which is less than the deceleration threshold.

A working machine comprising:

• a prime mover;
• a first traveling pump driven by power of the prime mover to supply operation fluid through a first connector fluid tube;
• a first traveling motor including first and second ports connected to the first connector fluid tube, the first traveling motor configured to provide the power to a first traveling device by the operation fluid supplied from the first traveling pump, and 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 of the operation fluid in the first connector fluid tube near the first port;
• a second pressure detector to detect second traveling-pump pressure of the operation fluid in the first connector fluid tube near the second port;
• and
• a controller configured, with the first traveling motor switched in the second speed, to automatically shift down the first traveling motor from the second speed to the first speed, when a first differential pressure between the first traveling-pump pressure and the second traveling-pump pressure and/or a second differential pressure between the second traveling-pump pressure and the first traveling-pump pressure is equal to or more than a deceleration threshold;
• and
• a display connected to the controller and configured to display that the first traveling motor is automatically shifted down from the second speed to the first speed.