Views: 0 Author: Site Editor Publish Time: 2024-10-17 Origin: Site
In the previous article we introduced the poor quality of the hydraulic oil may lead to excavator hydraulic pump damage, in fact, the hydraulic oil in the hydraulic system plays a role in lubricating the various components, if not replaced for a long time, the hydraulic oil becomes black, the viscosity of the hydraulic oil is reduced, will directly lead to the excavator hydraulic pump within the valves, multiplex valves, oil seals and so on the various components of the hydraulic system of non-normal wear and tear. Wear and tear, resulting in large gaps between the parts, thus the occurrence of internal leakage, which will seriously affect the excavator action coherence.
1. The reasons for the blackening of the hydraulic oil and treatment methods
Metal impurities as well as external pollutants can lead to hydraulic oil blackening, metal impurities may be excavator hydraulic pump's high-speed rotation and the abrasive debris generated, about and pump rotation of all components should be taken into account, such as bearings and other wear and tear; In addition, the new equipment break-in will also produce a large number of iron filings, the oil change should be all the hydraulic oil in the oil tank should be emptied, and with new oil After circulating the system, wipe the tank all clean with cotton cloth and then add new oil, so as to avoid the residue of iron filings. External pollutant pollution is mainly due to the sealing of the hydraulic system out of the problem, change the hydraulic oil is not clean, oil seal aging, excavator working environment is too poor to cause filter blockage, hydraulic pump into the air with a large number of bubbles and so on will lead to the problem of the hydraulic system sealing is not in place, you need to check one by one and pay more attention to it in the daily use.
When the hydraulic oil is black, you can take the addition of oil return filter device, add water spray device to reduce external dust, upper and lower bushings are too worn, replace the bushings in due course, intake check valve is bad or clogged, check the check valve on a regular basis, and replace the anti-dust seal in a timely manner.
If the hydraulic oil is seriously contaminated, it is necessary to replace the hydraulic oil in a timely manner, there are currently three ways to determine the oil change period:
(1) Visual oil change method. It is based on the experience of maintenance personnel, based on visual inspection of some of the oil routine state changes (such as oil black, odor, turn milky white, etc.), to decide whether to change the oil.
(2) Regular oil change method. According to the environmental conditions of the site where the equipment, working conditions and the oil used in the oil change cycle, due to be replaced. This method is very suitable for hydraulic equipment more enterprises.
(3) Sampling and testing method. Regular sampling and testing of oil, determination of the necessary items (such as viscosity, acid value, moisture, particle size and content, as well as corrosion, etc.) and indicators, according to the oil quality of the actual measured value of the oil deterioration standards for comparison, to determine the oil should not be changed.
2. Precautions for replacing hydraulic oil of excavator hydraulic pump
(1) before changing the original hydraulic oil, check the return filter element, suction filter element, pilot filter element, to see whether there are iron chips copper chips or other impurities, there may be hydraulic component failure, maintenance exclusion, cleaning system.
(2) change the hydraulic oil must be replaced at the same time all the hydraulic oil filter element (return filter element, suction filter element, pilot filter element), otherwise it is equivalent to not change the hydraulic oil.
(3) Identify the hydraulic oil labeling. Different grades, different brands of hydraulic oil do not mix, may react to the deterioration of flocculent. Recommended to use the excavator specified oil.
(4) Before refueling, install the suction filter element. Suction filter element covered by the mouth of the pipe leads directly to the main pump, into the impurities will accelerate the main pump wear, heavy pump.
(5) refueling to the standard position. Hydraulic oil tank generally have oil level meter, look at the table. Pay attention to the way the excavator is parked, generally all cylinders are all retracted, that is, the small arm, bucket completely out and land.
(6) After adding oil, pay attention to the main pump to exhaust air, otherwise the light is temporarily no movement of the vehicle, the main pump rattling (air sonic boom), heavy air pockets damage to the main pump. Exhaust air method is directly in the top of the main pump to loosen the pipe connector, direct filling can be.
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