Excavator hydraulic oil temperature is high (hydraulic oil temperature is related to ambient temperature, standard value < 90 ℃).
main cause:
(1) Low or deteriorated hydraulic oil
(2) Insufficient air volume or poor ventilation of radiator
(3) Poor oil inlet and return
(4) Diagnostic process of internal blockage of hydraulic oil radiator: Step 1: check whether the hydraulic oil is in the specified position or deteriorated. If it is not in the specified position, add it, and replace it if deteriorated.
Step 2: if the hydraulic oil is normal, please check whether the fan belt slips. If it is loose, adjust it. If there is oil stain, clean it. If necessary, replace the new belt; Check whether the fan blade is deformed or damaged. If it is deformed or damaged, replace it; Check whether the air guide cover is damaged or improperly positioned. If it is improper, adjust it or replace it if it is damaged; Check whether there is dirt on the radiator rib, resulting in poor ventilation. If so, clean it.
Step 3: check whether the oil inlet and return circuits are unobstructed (remove the oil suction filter element or oil return filter element, check whether there is dirt outside the filter element or the check valve at the lower part of the oil return filter element is not opened, resulting in untimely oil return and high temperature. If it is blocked, clean it in time and replace it if necessary; the oil return back pressure valve is stuck or the oil return pressure is too high to open, resulting in poor oil return. Check the oil return back pressure valve, clean the valve core and replace the oil return back pressure valve if necessary).
Step 4: check the hydraulic oil dispersion and check whether the internal oil passage of the oil dispersion is blocked. If it is blocked, remove the dirt inside the oil dispersion in time. If it cannot be cleaned, replace the hydraulic oil dispersion.
The hydraulic system produces abnormal noise.
main cause:
(1) Insufficient hydraulic oil
(2) Oil suction pipe leaks
(3) The oil suction and return pipeline or filter element is blocked, and the oil suction and return pipeline is not smooth
(4) Fault diagnosis process of hydraulic components:
Step 1: check the oil level of the hydraulic oil. Too little oil can cause different sound when the hydraulic pump sucks air. If the hydraulic oil deteriorates, replace the hydraulic oil. Step 2: check whether there is air leakage in the oil suction pipeline.
Step 3: check the oil suction filter element, oil return filter element and oil return back pressure valve, and clean and replace them if necessary.
Step 4: check whether the abnormal sound hydraulic element is damaged. If it is damaged, repair it and replace it if necessary.
