Replacement of hydraulic oil and maintenance of oil filter

Changing the hydraulic oil is a work requiring patience. Before starting the engine, make sure that the oil tank, hydraulic pump, motor and other small parts are filled with hydraulic oil.

1. The lubricating oil is dark black (indicating that there is no cleaning dispersant in the lubricating oil).
2. There are many foam and emulsification occurs.
3. Rubbing with your fingers will cause sticky, astringent or peculiar smell.
4. It is dark brown when dropped on white paper, without yellow impregnated lubrication area or many black spots.

Let's analyze the quality indexes of lubricating oil:

1. Viscosity: a very important point. In fact, this problem is generally not considered. The viscosity of the oil replaced by the injection molding manufacturer is almost qualified and will not change in 5-8 years.
2. There are many impurities, especially ultrafine particles, suspended in the lubricating oil, making the lubricating oil feel too dirty. This is a big problem, but it can be solved.
3. Additives: nothing more than anti-wear additives, antioxidants, defoamers, anti emulsifiers, etc. Generally speaking, additives will continue to wear, but generally speaking, they can be used for at least 5-8 years

The others seem to be nothing. Based on the above viewpoint, it is not difficult for us to analyze that as long as the ultra-fine impurities, emulsions, moisture and oil can be removed, it can be used for 5-8 years.

Changing the hydraulic oil is a work requiring patience. Before starting the engine, make sure that the oil tank, hydraulic pump, motor and other small parts are filled with hydraulic oil.

Once the engine is started without injecting hydraulic oil into the relevant parts, it is very likely to cause double injury to the excavator and the surrounding personnel. hurt. If the hydraulic oil is to be completely replaced, the corresponding oil pipe connector must be disassembled. When operating, first make sure that there is no pressure in the pipeline. In addition, pay attention to avoid the direction of oil discharge, and take protective equipment. In addition, we must pay attention to be as careful as possible during operation, and do not rough operate and damage the thread or joint surface of each pipe joint of the hydraulic system.