Emergency response methods for excavators

During the operation of the excavator, if there is a "gear shift" in the transmission, the machine should be stopped (or continued to operate) in a timely manner, and the cause should be identified and the fault eliminated. The specific method is:
(1) When driving on a flat road, if there is a "gear jump", you can stop the machine according to the normal stopping method, carefully investigate the cause, and eliminate the fault.
(2) When driving uphill, if there is a "gear jump", you can set the gear to the low speed position or the first gear position, and stop the machine when it reaches the top of the slope to troubleshoot the problem; If the downshift is unsuccessful or there is another "gear jump", the machine should be stopped according to the instructions and requirements for stopping on a slope, and then the fault should be eliminated.
(3) When driving on a downhill slope, if there is a "gear jump", the gear should be shifted to the high speed position or "emergency downshifting" measures should be taken according to the instructions for upshifting. After the machine reaches the bottom of the slope, it should be stopped for inspection and troubleshooting; If the "upshift" or "gear grab" is unsuccessful, or if there is another "gear jump" (in neutral), the driver can control the engine speed at medium speed (to prevent the engine from stalling), use the "spot brake" method to slide the machine to the bottom of the slope, and then troubleshoot. If the "gear up" or "gear grab" is unsuccessful, or if there is another "gear jump" (in neutral), and the machine is on a downhill slope (at which point the machine will quickly "dive" towards the bottom of the slope), it should be stopped quickly according to the instructions and requirements for downhill shutdown, and then the fault should be deducted.
1： Is the pilot pressure of the rotary operation within the normal range (normal pilot pressure above 35KG);
2： Is the rotary overflow valve damaged? Is the rotary overflow pressure within the normal range (overflow pressure: 280KG);
3： Whether the main rotary valve core is switched in place and whether the return spring of the rotary valve core is broken;
4： Wear and damage of the distribution valve, causing internal leakage of the rotary motor;
5： The rotary motor pump body and plunger are worn and damaged, causing internal leakage of the motor;
6： Only if the rotation is slow and the other movements are normal, can the hydraulic main pump and main relief valve be ruled out as faulty.