How to Maintain Hydraulic System of Drilling Rig

The hydraulic fluid of drill rig should meet the following requirements: it must not contain steam, air and other vaporized impurities; it has good lubricating properties, high liquid film strength; high chemical stability; good viscosity performance.

Oil contamination is a major cause of hydraulic failure. Contaminants can accelerate the wear of hydraulic parts or cause valve malfunction or noise. Contaminants can block the orifice of the hydraulic component, changing the working performance of the hydraulic system, causing the malfunction or even complete failure. Dust particles in the hydraulic cylinder will accelerate the damage of the seal, it may also cause the filter to be clogged, the hydraulic pump is difficult to absorb oil, and the oil return is not smooth, resulting in cavitation, vibration and noise. When the blockage is serious, the filter will be broken due to excessive resistance, completely losing the filtering effect. 

Therefore, management must be strengthened to prevent oil contamination, ensure the hydraulic system can operate safely and reliably.
  1. The fuel tank should be kept clean and sealed with a cover.
  2. The oil in the fuel tank should be replaced regularly, and it should be changed after 1000 hours of work.
  3. When filling the oil, it should pass through the filter of 120 mesh or more.
  4. Check andclean filter.
  5. Regularly clean the hydraulic components with kerosene and dredge the pipeline.
  6. Regularly check the pipe joints and seals between the piping and components.
The possibility of air entering the hydraulic system is small, but the compressibility of the low-pressure air is very large. Even if the hydraulic system contains a small amount of air, its influence is large and will cause system malfunction. When the gasification in the oil is severely pressurized, a large amount of heat is released, causing local overheating and damaging the hydraulic components and hydraulic oil. A large amount of air bubbles will reduce the service life of the oil, and aggravate component wear. Therefore, checking the oil level is so important.

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