Caterpillar 31l DLRR excavator works on the site in the morning, and everything works normally, but in the afternoon, when the Caterpillar excavator was started, the phenomenon of "weak walking of the excavator" suddenly appeared, resulting in the excavator not working properly. What should I do? How to solve the problem of "weak walking of excavator?"
The following is the common cause analysis of the Caterpillar 311DLRR excavator's walking weakness failure based on years of Caterpillar excavator maintenance and repair experience:
1 Caused by failures other than the hydraulic system, including insufficient engine power and unstable speed; manual control mechanism is loose, stuck or stroke is not in place; voltage and current are abnormal.
2 The oil quantity and quality of the hydraulic oil tank of the excavator are caused by pollution of the oil filter.
Corresponding troubleshooting method:
1 Check whether there are mechanical failures in the connecting parts of the excavator engine and hydraulic pump, hydraulic motor and driving wheel.
2 Check whether the bypass valve installed on the front drive motor is in the passage state, if it is, the high and low pressure oil chambers will be connected.
3 Check the brake system. When the engine is working normally and the solenoid valve is energized, whether the brake can be disengaged. If it cannot be disengaged, check whether there is a mechanical failure. If not, use the drag method to release the brake ( Turn the hand pump handle counterclockwise), and then do the following check.
4 Check the high pressure and charge pressure of the main circuit of the walking hydraulic system.
Extended reading:
Check the high pressure and charge pressure of the main circuit of the walking hydraulic system if the following conditions occur:
1 If the charge pressure is lower than the specified value, put the walking joystick in the neutral position to adjust the charge pump relief valve.
2 If the pressure cannot reach the normal value or the pressure gauge reading does not change, it can be judged that the overflow valve or charge pump is faulty.
3 If the refueling pressure is normal when the machine is not running, the refueling pressure will drop a lot during the walking operation. If the pressure is low, it indicates that the shuttle valve and low-pressure relief valve of the motor are faulty; when the refueling pressure is higher than the specified value, it can be adjusted. If the pressure of the relief valve is low, the relief valve is faulty if it cannot be adjusted down.
4 If the high-pressure pressure is low, the failure may be caused by the hydraulic pump, hydraulic motor, multi-function valve block (including high-pressure relief valve), then the high-pressure relief valve is defective.
