A method of monitoring a condition of a working drum of a construction machine or a mining machine movable in a working direction, or of tools of the working drum arranged on a circumference of the working drum, the machine including a drum housing having a housing shell at least partially enclosing a circumference of the working drum, the housing shell including at least one inspection opening, the method comprising:
- (a) keeping the at least one inspection opening free from deposits of milled material during a working operation of the working drum by allowing a partial flow of the milled material worked off by the working drum to pass through the at least one inspection opening;
- (b) conducting the partial flow of milled material radially outward of the housing shell and in front of or behind the working drum as seen in the working direction;
- and
- (c) during an interruption of the working operation in which the working drum is not engaged with a surface to be worked, monitoring the condition of the working drum or of the tools through the at least one inspection opening with at least one monitoring device, the at least one inspection opening having been kept free from deposits of milled material in step (a).