What is the fault when the excavator safety lock is opened but there is no action?
4 Answers
Excavator safety lock opened but no action fault diagnosis. Check hydraulic oil level: Blocked hydraulic circuit suction filter, oil circuit suction vacuum (including excessively low hydraulic tank oil level) can cause insufficient oil suction or even failure to draw oil in the hydraulic pump. These will directly lead to insufficient oil pressure in the hydraulic circuit, resulting in no movement of the excavator. This type of fault can be diagnosed by checking the hydraulic tank liquid level and the contamination degree of the hydraulic oil. Check if the hydraulic pump has malfunction: Hydraulic excavators generally use 2 or more main pumps to supply pressurized oil to the system.
I've encountered the issue of the excavator not moving after the safety lock is opened several times. As an experienced operator, the most common cause is a faulty safety lock itself, such as worn internal switch contacts preventing current flow; it could also be a blown fuse—try finding a replacement in the fuse box. Next, check the relay, which controls the main circuit—if the contacts are burnt out, it won't function. Or there might be poor circuit contact due to loose plugs that need reseating. Sometimes, the control system module fails or sensors malfunction. My advice is to start troubleshooting the simpler components first, and don't forget to use a multimeter to test voltage. If unsure, promptly call a professional technician—safety comes first to avoid accidents from improper handling.
Having operated excavators for over a decade, let me share some insights on this malfunction: Safety lock failures often originate from electrical system issues. For instance, oxidized or jammed safety switch contacts require cleaning or replacement; check the corresponding position on the dashboard for blown fuses due to overheating; inspect and test aged relay coils by removing them; use a multimeter to trace short circuits or open circuits in wiring; diagnose abnormal control units by reading fault codes. Through numerous similar repair cases, I've found carrying diagnostic tools saves time—tackle minor issues yourself, but don't delay seeking professional technicians for complex problems, as this could otherwise impact the machinery's overall lifespan.
From a safety perspective: If the excavator safety lock is engaged and the machine does not move, it is usually caused by switch failure or circuit interruption. The equipment must be stopped to identify potential risks; check the fuse status to prevent overload; test the relay function to ensure accurate control; make sure all plugs are securely connected. Ignoring repairs may lead to more severe damage or even safety incidents. It is recommended to conduct quarterly maintenance checks on the electrical system and make it a habit. Report any faults promptly to professional institutions for handling—safe operation should always be the top priority.
