Not long ago, we received a consultation call from the main Carter 320D excavator, and his excavator showed various slow movements of the whole machine. The phone said, "My machine is a 320D Carter excavator. I haven't bought it for a year, and the maintenance has been done in place, but I don't know how to do it. These days, the machine has been very slow to dry, even if it is It takes more than ten seconds to idle, and it is impossible to work.
We listened to the call for help, and then asked some related questions, and made a detailed failure analysis of the problem of "the Carter 320D excavator is slow to move":
1 Boss, when running at full load, is your 320D engine speed normal?
Answer: The engine speed is normal
2 Boss, is the smoke color of your excavator engine normal when operating at full load?
Answer: The smoke color of the engine is normal
3 Boss, what kind of job do you usually use for your digging machine? What are you working on recently?
Answer: My excavator is generally used on construction sites, and I'm helping people dig fish ponds recently.
4 Li Ban, do you know the three working modes of 320D? Did you use it yourself?
Answer: Not very familiar.
Caterpillar 320D excavator slow motion "failure analysis:
After roughly understanding the basic situation of boss Wang, we formulated a solution for the order from simple to complex:
1.320D hydraulic excavator is designed with three different power modes: fine mode, normal mode and heavy load mode. The engine power absorbed by the hydraulic system is 75%, 90% and 100%, if the power mode is set In the fine mode, it is possible to cause the machine to move slowly. [Boss Liu checked, and after setting his own excavator, he found that it is currently set to heavy load mode]
2. Judging from the normal engine speed and normal smoke color, the possibility of engine problems is ruled out, most likely from the hydraulic system.
Cause one: The pilot system controls the low oil pressure. [The pilot pump provides pressure oil for the pilot system, which is to control the main oil circuit to complete the corresponding action, which is one of its important functions.
If the pilot system fails, the pilot system pressure is too low, it will lead to the pilot oil can not control the main control valve or the main control valve spool stroke is too small, so that the main oil flow is insufficient, it may also cause machine action Too slow]
Cause two: main pump pressure is low
Cause 3: The hydraulic oil circuit is not smooth, and the hydraulic oil filter is blocked.
