Komatsu excavator hydraulic oil blackening cause one, impurities:
Metal impurities such as iron filings are the main factors affecting, and the most likely one is the grinding debris generated by the high-speed rotation of the pump. It is currently known that all components that are rotated with the pump are possible, such as wear of bearings, volume chambers, and the like. At the same time, the hydraulic valve spool runs back and forth, and the grinding debris generated by the cylinder running back and forth. But this will not happen in a short time.
Of course, if your excavator is just newly purchased, it will produce a lot of metal impurities during running-in. It is recommended to empty the hydraulic oil in the fuel tank when changing oil. Wipe all the oil tank with cotton cloth and add new oil. . If it is not emptied, there may be a large amount of iron filings left in the fuel tank, which will also cause the new oil to become contaminated and black.
2. Komatsu excavator hydraulic oil becomes black. Second, it is affected by the external environment.
1 Excavator caused the pipeline to be tightly sealed due to mechanical failure, oil seal aging and other reasons;
2 Excavator working environment is too bad, causing the filter element to block;
3 Dust-proof measures are not well done during cleaning, oil change, and maintenance. Impurities are brought into the hydraulic system during operation.
Here, it is recommended that you check if your hydraulic system is closed, the breathing hole is intact, check the exposed parts of the hydraulic part of the equipment, and see if the seal is intact, such as the dust ring of the cylinder.
If your excavator often uses a breaker, the cause of the blackening of the hydraulic fluid is not only impurities, but also because of the irregularity of the butter.
When adding butter, you need to lift the breaker and press the steel into the piston. You only need to add half of the standard grease gun for each filling. Because if the steel is not pressed when the butter is added, the butter will be placed at the upper limit of the steel groove. When the steel is working, the butter will directly hit the main oil seal of the breaker, along with the piston. The reciprocating motion brings the butter into the cylinder of the breaker, and then the hydraulic oil in the cylinder of the breaker is mixed into the hydraulic system of the excavator, and the hydraulic oil is deteriorated and blackened.