Construction machine

摘要

The present invention provides a construction machine with a speed switching function having retractable crawler frames (4,8) using crawler shoes (15), comprising: detection means (36a,36b) for detecting an extended state or a retracted state of the crawler frames (4,8); travel driving means for driving the crawler shoes; speed switching means (33) for switching speed of the travel driving means; and a controller (32) for controlling destination of switching of the speed switching means when the retracted state of the crawler frames is detected by the detection means. Adequate travel speed can be obtained according to the extended or retracted state of the crawler frames.