Komatsu excavation oil cylinder discoloration problem, what is the reason? -- Oil cylinder

Many excavator users may have experienced the problem of cylinder color change, mistakenly thinking that this is a problem of cylinder quality, and thus feel anxious. But in fact, digging oil cylinder discoloration is a common phenomenon. Next, let's explore the reasons for cylinder discoloration, hoping to provide you with useful help. -- Oil cylinder

The color change of the excavator hydraulic cylinder is not the change of the material of the cylinder itself, but the surface of the cylinder is covered with a layer of colored film, which is not a quality problem. Usually, the cylinder will first appear blue, and then gradually darken to purple and finally black.

First, there are many reasons for the discoloration of the oil cylinder

1. The temperature in the hydraulic system is too high, and the piston rod frequently contacts the low temperature environment at high temperature (especially in the cold season), resulting in a sharp change in temperature.

2. During maintenance, a hydraulic oil not special for this brand of excavator is used, which usually causes the piston rod to discolor within a few days after the oil is replaced.

3. The temperature control during the electroplating process of the piston rod is not uniform, resulting in cracking free phenomenon on the surface of the electroplating layer during the working process, and irregular small cracks on the surface of the piston rod can be observed using a high-magnifying glass. -- Oil cylinder

4. The blue is caused by the additives in the oil seal and hydraulic oil adhering to the cylinder rod at high temperature, while the black is caused by the lead containing additives in the spray material in the wear sleeve adhering to the cylinder rod at high temperature.

Usually, the cylinder discoloration is caused by the high temperature of the hydraulic oil, and this phenomenon occurs in the front half of the bucket cylinder that is frequently used. It is recommended to clean the dust of the radiator regularly to ensure good heat dissipation.

Second, the method to solve the problem of cylinder discoloration,

If the small parts of the cylinder appear blue, usually no special treatment, over time will disappear naturally.

If the discoloration is serious, it is necessary to replace the oil seal and wear sleeve, and take measures to reduce the hydraulic oil temperature, and the problem will usually be solved after a period of time. -- Oil cylinder