After using the pile driver for some time, you may notice that the color of the hydraulic cylinder changes. Initially, it appears blue, but over time, the color deepens to purple and may eventually turn black. This is actually due to a colored film forming on the surface of the cylinder, which is unrelated to the pile driver or the cylinder itself. Therefore, you can continue to use the machine with confidence. However, there are reasons for this discoloration. Let's analyze the causes of the hydraulic cylinder discoloration:

1. High Temperatures in the Hydraulic System: The hydraulic system of the pile driver can experience high temperatures, especially in winter. During operation, the piston rod works under high temperatures and frequently comes into contact with the low-temperature external environment.

2. Using Non-Specialized Hydraulic Oil: While everyone may follow daily maintenance routines, using hydraulic oil not specifically designed for pile drivers can cause discoloration within a few days. This is because different brands and types of hydraulic oil have varying qualities and performances in their extreme pressure and anti-wear additives.

3. Analyzing Discoloration Based on Color: The blue color is caused by the oil seals and additives in the hydraulic oil adhering to the cylinder rod at high temperatures. The black color results from additives containing lead in the wear-resistant coating adhering to the cylinder rod at high temperatures.