The problem of walking failure can be regarded as the most distressed public enemy of the old driver, because the excavator's "legs" have problems walking, no matter what the working conditions are! A Caterpillar excavator, the owner consulted me to have a Caterpillar cat324. The pressure of the whole vehicle is enough but it is slow. The new hydraulic pump of the engine has just been repaired, and the distributor has been repaired. The combined and split solenoid valve is pulled out, if it is plugged in, it will stop the vehicle when walking and can't walk. When the arm is retracted, the stall flow is large, but the car is not fast.
Basic information of Carter excavator
Equipment brand: Carter
Equipment model cat324
Working hours: 11000 hours
Year of delivery: 2010
Carter excavator is slow, while walking and walking, analysis and diagnosis of failure:
Adjust the data to see if the action is confluent, check whether the two solenoid valves on the pump are stuck, do not connect the plug first, and see if the speed is fast.
If the speed is extremely slow, there are two reasons.
1. One of the pumps is not working.
2. The LS valve is installed incorrectly.
Pull off the middle of the five solenoid valves, and measure the overflow pressure of the two pumps when the arm rises and walks. Insert it back, and then measure. The pilot pressure is also measured.
Test results: Unplugged, measured walking 390, the front and back pump pressure is 320, the boom overflow pressure is 320, the pilot is 30 kg. The whole vehicle walks fast, as if there is no turtle block, there is a edge when the high plug is inserted Walking will not go away.
The plug is unplugged fast, and the plug is connected slowly, which is the reason. You can adjust the PC valve to make the car movement speed normal and fast, and not hold back the car.
Carter 200-6, PC valve adjustment must be careful, the number of threads should not be less than 6 at least, otherwise it is easy to cause vicious accidents.
Is the new solenoid valve made in China or imported? Domestic performance is not guaranteed, and sometimes repair fails and fails on domestic accessories.
But the repairman must be sober, whether it is domestic or imported accessories, as long as it is replaced, it is necessary to connect the meter to check the pressure output value, whether it is correct, and determine whether it can be used.
The adjustment speed is not fast and the vehicle is held back for two reasons:
1. The adjustment is incorrect.
2. The engine power is seriously insufficient.
Correct adjustment:
1. Adjust the LS valve, the idling and no-load pressure is not less than 35 kg, and the high speed is not more than 45 kg. It must be accurate, which affects the performance of the car. Too low speed adjustment is not fast, too high is not good to start the car, oil temperature and water temperature are high, waste energy.
2. Adjust the PC valve and adjust it according to the engine power. If the vehicle is not fast enough after adjustment, the engine must be repaired.
