We all know that Komatsu's oil cylinders are divided into boom cylinders, ARM cylinders, and bucket cylinders.
But why does the oil cylinder change color and does it have any impact?
Firstly, the color change of the hydraulic cylinder to blue, black, or purple is not the color change of the cylinder block.
In fact, the surface of the cylinder is covered with a film. Generally speaking, the cylinder will first turn blue, then deepen to purple,
and finally turn black。
There are various reasons for the discoloration of excavator oil cylinders
1. There is a phenomenon of high temperature in the hydraulic system, and the piston rod frequently comes into contact with low temperature environments (sudden temperature drop) at high temperatures (especially during cold seasons);
2. During the maintenance cycle, replacing hydraulic oil that is not specifically used for excavators of this brand usually results in discoloration of the piston rod within a few days after changing the oil.
3. During the electroplating process of the piston rod, due to uneven temperature control, cracks appeared on the surface of the electroplating layer during later work. Irregular small cracks can be seen when observing the surface of the piston rod with a high-power magnifying glass.
4. Bluing is caused by additives in oil seals and hydraulic oil adhering to the cylinder rod at high temperatures, while blackening is caused by lead containing additives in the spray inside the wear sleeve adhering to the cylinder rod at high temperatures.
