The problem of walking fault can be regarded as the most distressed public enemy of the old driver, because there is a problem with the "two legs" walking of the excavator, no matter what the working conditions are! A Caterpillar excavator has enough pressure but is slow. The new hydraulic pump of the engine has just been repaired, and the distributor has also been repaired, but it still can't Isn't there a row of solenoid valves under the distributor? The repairman unplugged the closing and shunting solenoid valves. If they were plugged in, one side would not walk. When the boom retracted vertically, it would stop. The flow was too large to hold the car, but the car was not fast.
Basic information of Caterpillar excavator
Equipment brand: Caterpillar
Equipment model cat324
Working hours: 11000 hours
Factory life: 2010
Analysis and diagnosis of the fault that Caterpillar excavator is slow and does not move at the same time:
Adjust the data to check whether the actions are converging. Check whether the two solenoid valves on the pump are stuck. Do not connect the plug first. Check whether the speed is fast.
If the speed is unusually slow, there are two reasons.
1. One of the pumps is not working.
2. 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, travels and moves Plug it back in and retest The pilot pressure is also measured
Test results: it is unplugged. It is measured that the travel is 390, the front and rear pump pressure is 320, the boom overflow pressure is 320, and the pilot is 30kg The whole car moves quickly. It seems that there is no tortoise block. When the high plug is plugged in, the car can't walk
The plug is pulled out quickly and connected slowly, which is the reason The PC valve can be adjusted to make the car move faster without holding the car
For Caterpillar 200-6 car, pay attention to the adjustment of PC valve. The number of threads shall not be less than 6, otherwise it is easy to cause fatal accidents.
Is the new solenoid valve made in China or imported? Domestic performance is not guaranteed. Sometimes repairs fail on domestic parts
However, the repairman should be clear headed. As long as the domestic or imported parts are replaced, the gauge should be connected to check whether the pressure output value is correct and whether it can be used.
There are two reasons why the adjustment speed is slow and the car is stuck:
1. Incorrect adjustment.
2. The engine power is seriously insufficient.
Correct adjustment:
1. adjust LS valve. The idle no-load pressure shall not be less than 35kg, and the high-speed pressure shall not be more than 45kg It must be accurate. It has a great impact on the car's performance It is too slow to adjust the speed. It is too high to start the car. The oil temperature and water temperature are high, which wastes energy.
2. adjust the PC valve according to the engine power. If the car is still stuck after adjustment, the engine should be repaired.
