After a Caterpillar 336d excavator in Nanming District, Guizhou Province was heated up, it often appeared that the middle arm of the excavator was weak, and the action was continuous. There were also frequent heat engines, sometimes the card was weak, and there would be a pause. When the excavator was open, sometimes the bucket handle became heavy. What was the matter?
Maintenance analysis of the failure of the retractor arm of the excavator hot car:
Patrol the jib pressure compensation valve and holding valve Whether the jib cylinder has internal leakage There may also be a problem with the distribution valve If the handle is newly replaced, it will be ok if you add some butter to it 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.
Check whether the hydraulic pump has confluence Patrol the unloading valve. The valve block may be dirty if it is stuck The excavator is slow and unable to excavate but the engine does not hold the truck. The boom and middle boom hold the engine, 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?
If the engine speed is high, there is no need to adjust the throttle motor and engine; It is recommended to check whether the pilot pressure is normal first, then check the working condition of the proportional reducing valve, and do Google PRV scanning -- this should be implemented by knowledgeable maintenance workers; If it is confirmed that the descending speed of the machine at full load is very low, generally speaking, the variable system works abnormally; Internal leakage of the hydraulic system will cause high hydraulic oil temperature.
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.
Heavy load flameout analysis of excavator:
It should be a circuit problem Clean the oil circuit and the oil-water separator. The oil circuit may be blocked If you blow the oil pipe with your mouth, it's a problem with the circuit.
There is a filter element in the oil-water separator. Replace it Check whether the distribution valve discharge pin is stuck
