Abstract: To enable maintenance of a control valve in a narrow space, on a slewing frame an engine is disposed at a rear portion, a swivel joint is disposed between a pair of vertical plates, a slewing motor is disposed diagonally behind the swivel joint between the paired vertical plates, and a control valve is disposed diagonally behind the swivel joint between the paired vertical plates and forward of the engine. A detachment direction A of a plurality of spools of the control valve extends obliquely in such a way as to get closer to a right vertical plate as it goes rearward.

Abstract: To enable maintenance of a control valve in a narrow space, on a slewing frame an engine is disposed at a rear portion, a swivel joint is disposed between a pair of vertical plates, a slewing motor is disposed diagonally behind the swivel joint between the paired vertical plates, and a control valve is disposed diagonally behind the swivel joint between the paired vertical plates and forward of the engine. A detachment direction A of a plurality of spools of the control valve extends obliquely in such a way as to get closer to a right vertical plate as it goes rearward.

Abstract: When obtaining a final result from a discriminator group arranged in a predetermined order, an evaluation value obtaining unit successively evaluates each discriminator from a first discriminator and if it is determined that a discrimination result represented by an overall evaluation value obtained by evaluating the first to Ith discriminators remains unchanged even if evaluation values of I+1th and subsequent discriminators are added to the overall evaluation value, a discrimination result determination unit instructs the evaluation value obtaining unit to terminate the evaluation of the I+1th and subsequent discriminators, and determines the discrimination result according to the overall evaluation value obtained by evaluating the first to Ith discriminators as a final result.

Abstract: When obtaining a final result from a discriminator group arranged in a predetermined order, an evaluation value obtaining unit successively evaluates each discriminator from a first discriminator and if it is determined that a discrimination result represented by an overall evaluation value obtained by evaluating the first to Ith discriminators remains unchanged even if evaluation values of I+1th and subsequent discriminators are added to the overall evaluation value, a discrimination result determination unit instructs the evaluation value obtaining unit to terminate the evaluation of the I+1th and subsequent discriminators, and determines the discrimination result according to the overall evaluation value obtained by evaluating the first to Ith discriminators as a final result.