Modern excavator repair
Modern Excavator Lifts Boom Slowly for Repair
Recently, I received a phone call from the main excavator of Yunnan Dig Hyundai.The phone said that one of his modern R265LC-9 excavators (excavator) had a slow boom lifting speed during operation, and other malfunctions that were normal. You don't know how to start the inspection, nor do you know what caused it.
Describe the common inspection methods for the slow movement of the boom of the excavator:
1.Check that the Rotational Speed of the excavator engine and the speed of other working devices are normal.
2.Check that the excavator monitoring panel has no fault records.
3.Interchange the PPC tubing of the digging motor arm and the PPC tubing of the bucket, the fault remains, and the pilot fault is eliminated.
3.Remove the boom lift pressure compensation valve, and found that there is a small hexagon socket bolt (composition: head and screw) in the pressure compensation valve to fix the cylinder piston.
4.Measure the lifting overflow pressure and PLS pressure of the digging manipulator.
5.The fault may be caused by excessive pressure or excessive flow caused by the back pressure valve, unloading valve, LS valve, servo piston, swash plate, etc. of the hydraulic systems.
6, check the unloading valve for abnormality-make sure that the failure point is on the hydraulic pump. Adjust the LS valve failure phenomenon without change. Remove the servo piston and install it after cleaning. The engine starts normally and the hydraulic pressure is normal.
7 .: The pressure compensation valve is stuck and the foreign matter is removed. The fault disappears
Warm reminder: This case is because the servo piston is stuck for a long time without changing the hydraulic oil, and the swashplate angle is too large to start the machine. Cleaning hydraulic systems (Hydraulic systems) The machine is normal after replacing the hydraulic oil. After handling any failure ( fault), you should not start blindly. You should combine the actual situation of the fault according to related theories, first lock the cause of the fault to the smallest possible range, and then gradually check and eliminate from the outside to the inside. Do more with less. You must perform maintenance as required, and replace the hydraulic oil and filter on time. Check it again and you can quickly find the fault
Various brands and models of excavator big and small arm faults can call for detailed reasons, modern excavator repair (wéi xiu) professional (specialty) processing, please contact us for consultation.