Origins of Machine Stalling
When a machine is operating continuously for overtime, similar to people working in shifts while the machine runs continuously, it is prone to malfunctions such as stalling, or even more serious problems, severely impacting work efficiency.
Methods for Identifying Stalling
1. The bucket shaft manufacturer's repair technician, after understanding the owner's description and conducting a comprehensive on-site inspection, combined with past repair experience, first replaced the diesel fuel filter with a new one, then checked the diesel fuel system and air filter for proper operation. No abnormalities were found after the inspection.
2. The bucket shaft manufacturer, after the repair technician's inspection, found no abnormalities in maintenance parts. At this point, the manufacturer suggested the technician focus on the hydraulic components. First, the EPPR valve (electromagnetic proportional pressure reducing valve) voltage was checked and found to be 23.8V. Under secondary pressure, the reading was 0 kg, which initially indicated that the EPPR valve core was stuck.
3. Based on the above troubleshooting results, in order to more accurately and thoroughly identify the fault, the repairman connected the disassembled EPPR valve to a 24V voltage. After pressure testing, the EPPR valve could operate normally on its own. This shows that the problem of the valve core inside the EPPR valve being stuck does not exist. At this point, based on the advice of the bucket shaft manufacturer and his past experience, the repairman determined that the cause of the fault could be narrowed down to the circuit.
4. Based on the above results, the valve core is not the problem and can be ruled out. Next, check the circuit. The circuit diagram reveals that the EPPR valve wiring passes through the CN2 connector. The technician unplugged the CN2 connector and found severe corrosion inside the component, causing the EPPR valve to receive only intermittent voltage (23.8V).
Regarding the solution:
Based on the above, the conclusion is clear: the cause of the stalling problem is corrosion inside the connector. Simply repair the damaged connector and restart the machine; everything will return to normal.
Stalling is indeed a troublesome issue for machine owners, and getting the machine running intermittently is a significant challenge. Here, the bucket shaft manufacturer suggests: when a machine malfunctions, some fault points are quite simple to check, provided you have sufficient practical repair experience. Therefore, bucket shaft manufacturers urge all machine owners to regularly check for engine stalling or other malfunctions. Repairing an excavator is the simplest and most cost-effective way to deal with a problem. If you cannot quickly resolve the problem in the first instance, the result of the delay will not only be a waste of time but also a financial loss.
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