Details: The consultation phone of the owner of the excavator said, "My Hitachi ZX240-3 small head frequently appears to be weak after excavation, and the middle arm is weak, and the movement is coherent. What is the problem? Let's analyze it together!
Cause Analysis:
1. Check if the arm cylinder is leaking. Check the arm pressure compensation valve and holding valve.
2. Check the unloading valve, the valve may be dirty. Check whether the hydraulic pump has merged.
3. The distribution valve may also have problems.
Related Reading:
When the Hitachi ZX240-3 excavator is turned on, sometimes the bucket handle becomes heavy, and it will be better after a while. What is the matter? If the handle zidan is replaced soon, it will be fine to add some butter inside. Have passed other brands of hydraulic oil or fake oil.
Hitachi ZX240-3 excavator has a slow movement. If the digging is weak but the engine does not hold back the vehicle, the boom and the middle arm hold the engine and there is no speed drop. The bucket and steering have a speed drop phenomenon. The movement slows down when I work, there is no boring car feeling, the pressure is 28300kpa, what is the problem of the middle arm weakness?
Analysis: If it is confirmed that the speed of the machine at full load is very low, generally the variable system works abnormally; the internal leakage of the hydraulic system will cause the temperature of the hydraulic oil to be high; if the engine speed is high, it is not necessary to adjust the throttle motor; it is recommended to check the pilot pressure Whether it is normal: check the working condition of the proportional pressure reducing valve again, and do a PRV scan-this must be carried out by a knowledgeable maintenance worker; if the cold machine moves fast, the hot machine will slow down and all the actions will be troublesome, which means that The hydraulic pump is worn out; in addition, you have to pressure the hydraulic system too low to meet the standard.
