Doosan Diagnostic Tool UVIM Support Doosan Excavators High Quality

  When the machine is walking in a straight line, the right joystick remains unchanged and the left side 

returns to the neutral position (ie, stops). At this time, the right crawler continues to walk, while the 

left crawler slides 800-1000mm before stopping.

 1. Checking essentials:

  1. After analyzing the hydraulic system, the fault Joints and motors, etc.  

 02. Measure the system pressure. When the boom is raised to the maximum limit so that the pressure 

reaches the maximum, the measured system pressure is 330 BAR, indicating that there is no problem 

with the pump. 

 Doosan Diagnostic Tool DDT G2 SCAN( ECU ,DCU)Software 2016

 3. Apply external braking to the walking system. It was also observed that the front pump pressure was

 10.5BAR, while the rear pump pressure was 270BAR. 

 4. After replacing the four main oil lines on the center joint, it was found that the left-hand drive fault 

still existed. 

 5. Based on the above detection, it is concluded that the fault is inside the balance valve, overload 

valve and motor. Even after replacing the left and right motor end caps (ie balance valve and overload 

valve), the fault was still not eliminated. 

 2023.07 Doosan DMS-5 Data Monitoring System Diagnostic Software

 6. It was concluded that the fault was inside the motor. When the motor was disassembled and 

inspected, it was found that there were signs of wear and grooves between the valve plate and the 

cylinder barrel.

   2. Reason: Internal wear of the motor causes internal leakage of the motor.