System for measuring friction force of excavator swing device for supplying lubricating oil

An excavator comprising:

• at least one gyro configured to detect a slope of an excavator;
• a swing motor that rotates an upper body of the excavator;
• a first pressure sensor that detects an operational hydraulic pressure value applied to the swing motor;
• a swing joystick for driving the swing motor;
• a second pressure sensor that detects an operational value inputted to the swing joystick;
• and,
• a controller that receives an information detected by the gyro sensor, the first pressure sensor, and the second pressure sensor, and detects the operational hydraulic pressure value of the swing motor by the first pressure sensor when a maximum manipulation is applied to the joystick for more than a minimum measurement time at a swing measurement mode,
• wherein the minimum measurement time is set to be longer than a time taken for the swing motor to reach a maximum speed when the swing motor swings the upper body of the excavator, for which the upper body of the excavator maintains a posture having a minimum inertia moment of rotation in which a working device of the excavator is disposed proximate a rotation axis of the upper body of the excavator and the swing joystick is manipulated to a maximum extent.