Shanmeng: A Professional Manufacturer of Excavators and Loaders
Emergency Handling Methods for Excavators
Date:
2025-07-21
When the excavator experiences "shifting out of gear" during operation, promptly stop the machine (or continue driving) and then identify the cause to eliminate the fault. The specific method is:
(1) If "shifting issues" occur while driving on flat roads, stop the vehicle according to standard shutdown procedures, carefully identify the cause, and eliminate the fault.
(2) When "shifting surge" occurs while driving uphill, shift the gear lever to a lower-speed position or into 1st gear. Once the machine reaches the top of the slope, stop the engine and troubleshoot the issue. If downshifting fails or "shifting surge" happens again, follow the proper procedures and requirements for stopping on an incline, then address the underlying fault.
(3) When "shifting surge" occurs while driving downhill, shift the gear lever to a higher-speed position following the proper shifting technique, or immediately perform an "emergency downshift" maneuver. After the machine safely reaches the bottom of the slope, stop and inspect it to identify and resolve the issue. If attempting to "upshift" or "emergency downshift" fails, and "shifting surge" reoccurs—this time resulting in neutral—immediately reduce engine RPM to a moderate speed (to prevent stalling), then gently apply intermittent braking to allow the machine to coast smoothly down the hill. Once at the bottom, thoroughly troubleshoot and fix the problem. However, if "upshifting," "emergency downshifting," or "shifting surge" still fails despite these efforts—and if the machine is once again descending a steep slope (at which point it could rapidly "plummet" toward the bottom)—promptly execute the proper downhill-stopping procedure as outlined, carefully bringing the machine to a halt before addressing the underlying fault.
1: Check whether the pilot pressure for the slewing operation is within the normal range (normal pilot pressure should be above 35 kg);
2: The rotary overflow valve is damaged—check whether the rotary overflow pressure is within the normal range (overflow pressure: 280 kg).
3: Check whether the rotary spool has fully switched into position, and whether the return spring of the rotary spool is broken.
Four: The flow control valve is worn and damaged, leading to internal leakage in the rotary motor;
5. The rotary motor pump housing and pistons are worn and damaged, leading to internal leakage within the motor.
Six: If only the turning motion is slow while other actions remain normal, hydraulic main pump and main relief valve failures can be ruled out.
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Shanmeng: A Professional Manufacturer of Excavators and Loaders
Shanmon Engineering Machinery Co., Ltd.
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No. 13777, Nanhuan Road, Qingzhou City, Shandong Province, China
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