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What will the clogging of the hydraulic filter element of the excavator affect?

Jul 06, 2023
1. If it is a pump suction filter, it will cause insufficient oil suction of the pump, loud noise, heat generation, and then burn out.

2. If it is a high-pressure circuit oil filter, it generally has an alarm and a bypass valve, otherwise the blockage will cause the downstream components to move slowly, or the oil cylinder will not work.

3. If it is an oil return filter, it will cause blockage of the oil return and increase the back pressure. The cylinder moves slowly. However, the general oil filter has a bypass valve, that is, if the filter element is blocked, the hydraulic oil will directly return to the downstream circuit without passing through the filter element. The advantage of this is that it will not affect the normal operation of the system, but the harm is also very clear. Since the filter element is blocked, it means that the oil is dirty;

4. If the hydraulic oil is bypassed back to the downstream system without the filter element, it is likely to cause the downstream spool to stick and contaminate the downstream hydraulic components.

The maintenance method of the hydraulic oil filter element is as follows:

1. Drain the original hydraulic oil before replacement, check the oil return filter element, oil suction filter element, and pilot filter element to see if there are iron filings, copper filings or other impurities attached. If so, there may be hydraulic component failures. After troubleshooting, clean the system .

2. When changing hydraulic oil, all hydraulic oil filter elements (return oil filter element, oil suction filter element, pilot filter element) must be replaced at the same time, otherwise it is equivalent to not changing.

3. Identify the grade of hydraulic oil. Hydraulic oils of different grades and brands should not be used together. They may react and deteriorate to produce flocs. It is recommended to use the specified oil for this excavator.

4. The oil suction filter element must be installed before refueling. The nozzle covered by the oil suction filter element leads directly to the main pump. Impurities entering the pump will speed up the wear of the main pump if it is light, and the pump will be pumped if it is serious.

5. Refuel to the standard position. Generally, there is an oil level gauge on the hydraulic oil tank, see the level gauge. Pay attention to the parking method. Generally, all cylinders are retracted, that is, the forearm and bucket are fully extended and landed.

6. After refueling, pay attention to the main pump to exhaust air, otherwise, the whole vehicle will not move temporarily, the main pump will make abnormal noise (air sonic boom), and the main pump will be damaged by cavitation in severe cases. The method of exhausting air is to loosen the pipe joint on the top of the main pump directly and fill it up directly.
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