Patent ID: 7493978

Claim:
A traveling hydraulic working machine comprising at least one prime mover, a machine body for mounting said prime mover thereon, traveling means mounted on said machine body and including a torque converter coupled to said prime mover, a hydraulic pump driven by said prime mover, at least one working actuator operated by a hydraulic fluid supplied from said hydraulic pump, and an operating device for generating an operation signal to control said working actuator, said traveling hydraulic working machine further comprising: input means for commanding a target revolution speed of said prime mover; first detection means for detecting an operating situation of said working actuator; second detection means for detecting an operating situation of said traveling means; and prime-mover revolution speed control means for modifying the target revolution speed of said prime mover based on the operating situation of said working actuator detected by said first detection means and the operating situation of said traveling means detected by said second detection means, and controlling the revolution speed of said prime mover, wherein said first detection means includes means for detecting at least one of a delivery pressure of said hydraulic pump and a driving pressure of said working actuator, and said first detecting means further includes means for detecting the operation signal generated from said operating device.