Introduction to locking piston rods, causes of piston rod discoloration, and some common problems


Using hydraulic oil from a different brand than the excavator's original brand during maintenance will cause discoloration within a few days of the oil change. This is because the anti-wear additives in the hydraulic oil have different qualities and performance.

The discoloration of the hydraulic cylinder piston rod is mainly due to the following points. Let's learn about it together with the mold locking piston rod!
1. High temperature phenomenon exists in the hydraulic system. During operation, it often comes into contact with low-temperature environments in a high-temperature state.
2. Non-Brand excavator hydraulic oil was replaced during the maintenance cycle. This phenomenon usually appears within a few days of the oil change. The reason is that the quality and performance of an anti-wear additive in the hydraulic oil are different.
3. Due to uneven temperature control during electroplating, cracks will appear on the surface of the electroplated layer in later work. Irregular small cracks can be found on the surface by observing with a magnifying glass. Usually, this is caused by excessively high hydraulic oil temperature, and this phenomenon mainly occurs in the front half of the bucket cylinder that uses more buckets.
If the piston rod of the pressure cylinder is damaged, if it is not dealt with in time, it will affect normal use to a small extent, but it will not work on the hydraulic cylinder. Our repair method is to repair shallow marks by local grinding and polishing. For heavier scratches, welding and manual grinding can be used for repair.
Repair requirements: The packing must be firmly and smoothly combined with the base material. The seasoning should be easy to process manually, and manual processing should ensure that the piston rod diameter error is less than 0.06mm. Because the acidic welding rod is not easy to produce hydrogenation pores due to rust, it has good processability, is easy to operate, has beautiful weld formation, moderate material hardness, is easy to manually process, has stable arc, large melting depth, and is firmly combined with the base material.
In summary, this is what the mold locking piston rod has to say about its discoloration. I hope it can help everyone.

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Zhanwang Machinery Co., Ltd., Dongguan

Dongguan Zhanwang Machinery Co., Ltd. is a manufacturer and supplier of various precision mechanical parts, including rubber and plastic machinery parts, pneumatic and hydraulic machinery parts, precision shafts, piston rods, standard chrome-plated bars, guide columns, uprights, guide pillars, rollers, etc. We provide surface treatments such as super mirror polishing, hard chrome plating for different specifications of precision mechanical parts and various molds. We also offer additional surface treatments such as tempering, medium and high-frequency quenching, nitriding, and blackening for mechanical parts. Our factory is equipped with large CNC lathes, ordinary lathes, external cylindrical grinders, centerless grinders, and milling machines, enabling us to process and manufacture various special mechanical parts. We offer free pick-up and delivery with competitive Price.


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