Crawler traveling device, and working machine including crawler traveling device

A crawler traveling device comprising:

• a first wheel;
• a second wheel that is spaced from the first wheel;
• a support frame that supports the first wheel and the second wheel with respect to a machine body;
• a third wheel that is disposed above the support frame;
• an endless crawler that is wound around the first wheel, the second wheel, and the third wheel;
• a vehicle-height changing mechanism that changes a position of the support frame in a vertical direction with respect to the third wheel;
• and
• a distance changing mechanism that is provided at the support frame and that changes a distance between the first wheel and the second wheel, wherein
• the vehicle-height changing mechanism includes a pair of first actuators that are disposed at a front and a rear of a spindle of the third wheel, that contract in the vertical direction, and that change the position of the support frame in the vertical direction with respect to the third wheel;
• the pair of first actuators at the front and the rear of the spindle are offset in a width direction of the machine body;
• the support frame has a front support portion to support the first wheel and a rear support portion to support the second wheel;
• the distance changing mechanism includes a second actuator that couples the front support portion and the rear support portion and that contracts the support frame in a front-rear direction of the machine body;
• and
• one of the pair of first actuators that is at the front of the spindle is offset from the front support portion in the width direction, and overlaps the front support portion in a side view of the machine body when the second actuator is fully contracted.