Introduction:
The DoosanDH220LC-V excavator is a powerful machine used in various construction and excavation projects. However, encountering issues such as whole machine shaking during rotations and bucket arm operations can hinder its performance and efficiency. In this article, we will discuss how to identify and resolve the problem by utilizing the Doosan Diagnostic Tool UVIM and proper maintenance procedures.
V2023.07 Doosan Excavator Inspection Diagnostic Tool DDT SCR DPF G2 Scan DCU ECU DMS-5
1. Inspection Method:
To address the issue of machine shaking, it is essential to determine whether it is caused by mechanical or hydraulic factors. By following these steps, you can diagnose the cause of the jitter:
A. Analyze Mechanical or Hydraulic Jitter:
Check for any internal breakage in the rotary reducer or oil cylinder, as these can cause mechanical jitter. Ensure that all parts are intact and undamaged. Measure the negative control pressure during rotation and stick action—normal readings should be 6 BAR and 40 BAR for wide-center action.
B. Verify Overflow Pressure:
During the inspection, confirm that the overflow pressure during rotation is 285 BAR, and the bucket arm overflow pressure is 332 BAR.
C. Identify the Problem:
If both the rotation and bucket arm actions are vibrating simultaneously, it indicates an issue with the main pump. Damages to the pump’s plunger or sliding shoe can cause associated actions to vibrate, resulting in an abnormal feeling.
2. Reason:
After dismantling and inspecting the main pump, it was discovered that a crack in the sliding shoe was causing excessive leakage of the plunger. This leakage was the primary cause of the machine’s shaking during operation.
3. Processing Method:
To address the issue effectively, follow these steps:
A. Clean the Main Pump:
Thoroughly clean the main pump to remove any debris or contaminants that might affect its performance. Ensure the pump is free from any blockages or obstructions.
B. Replace Damaged Accessories:
Replace the damaged sliding shoe with a new one to prevent excessive leakage of the plunger. It is crucial to use high-quality, official Doosan replacement parts for optimal performance and longevity.
C. Professional Assistance:
Consider seeking assistance from a certified Doosan technician for complex repairs or if you are unsure about the process. They will have the expertise and experience to handle the issue effectively.
Conclusion:
By utilizing the Doosan Diagnostic Tool UVIM, conducting thorough inspections, and following the appropriate maintenance procedures, you can effectively resolve the problem of whole machine shaking in the DoosanDH220LC-V excavator. Regular maintenance and timely repairs will ensure the smooth operation of the excavator, maximizing its efficiency and productivity on construction sites.