Abstract: An engine control system for a construction machine is disclosed, which can compulsorily stop engine driving when an attachment or the like malfunctions against an operator's intention during the operation of an excavator or the like. The engine control system includes a first step of determining whether pilot signal pressure, which is detected when at least one of an operation lever and a traveling pedal for respectively operating an attachment, a swing device, and a traveling device is operated, exceeds a first set pressure, and a second step of determining whether the pressure on the outlet side of a main hydraulic pump exceeds a second set pressure, wherein if the pilot signal pressure detected in the first step does not exceed the first pressure and the pressure of the main hydraulic pump detected in the second step exceeds the second pressure, engine driving is compulsorily stopped by means of a control signal from the controller.

Abstract: The present invention relates to an improved pipe fixing device for a construction machine, wherein a hydraulic hose that is connected to a side of a hydraulic cylinder of a work apparatus that has a boom of an upper swivel body of the construction machine, is plumbed and assembled to be detachable in phases from an upper and a lower part of a clamp, thereby fixing the movement of the hydraulic hose so to be structurally sound and thereby reducing the required manpower.

Abstract: A hydraulic circuit for a construction machine is disclosed, which increases the temperature of hydraulic fluid up to an appropriate level for equipment operation even in a state where an operator does not sit on an operator's seat before starting working during the winter season or the like.

Abstract: An engine control system for a construction machine is disclosed, which can compulsorily stop engine driving when an attachment or the like malfunctions against an operator's intention during the operation of an excavator or the like. The engine control system includes a first step of determining whether pilot signal pressure, which is detected when at least one of an operation lever and a traveling pedal for respectively operating an attachment, a swing device, and a traveling device is operated, exceeds a first set pressure, and a second step of determining whether the pressure on the outlet side of a main hydraulic pump exceeds a second set pressure, wherein if the pilot signal pressure detected in the first step does not exceed the first pressure and the pressure of the main hydraulic pump detected in the second step exceeds the second pressure, engine driving is compulsorily stopped by means of a control signal from the controller.