PURPOSE: To facilitate decision of the position of a drive device by a method wherein an angle detecting device is located to a slewing device part, a drive device position display device is located in a driver's seat, and an upper slewing body is rotatably based on a lower running body.
CONSTITUTION: An angle detecting device 5 to detect a relative angle between an upper slewing body 1 and a lower running body 2 is located to a slewing device part 4. A drive device position display device 7 with a built-in LED is arranged to a driver's seat 9, and a detecting signal is transmitted to a position display device 7 in the driver's seat 9 by means of an electric signal. This constitution enables immediate decision of a relation between the operation direction of a running lever 3 and an advancing direction.
TAKIMOTO KYOZO
MIYAUCHI YOSHIAKI
