Details: after the Hitachi zx240-3 small nose is hot, it often appears that the middle arm of the excavation is weak, and the action can only be done continuously. In addition, the hot engine is frequent, and sometimes the card is weak, and there will be a pause. What's the problem? Let's analyze it together!
Cause analysis:
1. Whether the jib cylinder has internal leakage Check the boom pressure compensation valve and holding valve.
2. Check the unloading valve. The valve block may be dirty due to jamming Check whether the hydraulic pump has confluence.
3. There may also be a problem with the distribution valve.
Related reading:
When the Hitachi zx240-3 excavator is on, sometimes the bucket handle becomes heavy, and it will be OK after a while. What's the matter? If the handle Zidan is newly replaced, it will be OK to add some butter It's time to change the hydraulic oil or the hydraulic oil may have been mixed with other brands of hydraulic oil or fake oil.
Hitachi zx240-3 excavator is slow, unable to excavate, but the engine does not hold the truck. The engine of the boom and middle boom is held up, and there is no speed drop There is a speed drop phenomenon in the bucket digging and steering. The main pressure valve is not adjusted effectively. When working, the action slows down without the feeling of stuffy driving. The pressure is 28300kpa. What is the problem with the weak middle arm?
Analysis: if it is confirmed that the machine has little speed reduction at full load, generally speaking, the variable system works abnormally; Internal leakage of hydraulic system will cause high hydraulic oil temperature; If the engine speed is high, there is no need to adjust the throttle motor; It is recommended to check whether the pilot pressure is normal first, then check the working condition of the proportional reducing valve, and do PRV scanning -- this should be implemented by the knowledgeable maintenance workers; If the cold engine moves quickly, the hot engine slows down and all the actions are taken, it is troublesome, which means that the hydraulic pump is worn; In addition, your hydraulic system pressure is too low to meet the standard.
