Maintenance of The Hydraulic System of Second-hand Rotary Drilling RIGS: Oil Change Cycle And Oil Selection

The hydraulic system is the "power heart" of a second-hand rotary drilling rig, and its performance directly affects the drilling efficiency and operation safety of the equipment. The hydraulic system of second-hand equipment is prone to malfunction due to wear and tear from previous use and aging of the oil. Scientifically controlling the oil change cycle and oil selection is the key to extending the service life of the hydraulic system.

1. Determine the basic cycle based on the usage duration: If the equipment operates continuously for more than 200 hours per month, it is recommended to replace the hydraulic oil every six months. The operation duration is relatively short (less than 100 hours per month), which can be extended to 8 to 10 months, but should not exceed one year at most to prevent the oil from deteriorating and affecting the system operation.

2. Adjust the cycle in combination with the oil condition: Regularly draw a small amount of hydraulic oil for observation. If the oil color is dark brown, there are flocculent impurities, or the viscosity exceeds the standard range, even if the basic cycle has not been reached, it should be replaced immediately to prevent wear of the hydraulic pump and cylinder.

3. Prioritize matching with the original factory standards of the equipment: When purchasing hydraulic oil, refer to the viscosity grade marked in the drilling rig manual (such as 46 #, 68 # anti-wear hydraulic oil) to avoid insufficient lubrication of hydraulic components or pressure loss due to viscosity mismatch. The original factory-recommended model is the most reliable choice.

4. Pay attention to the key performance indicators of the oil: Select hydraulic oil with anti-wear, anti-emulsification and anti-oxidation properties. Especially for second-hand equipment, the sealing performance of the hydraulic system may decline. Oil with good anti-emulsification properties can reduce component rusting caused by water mixing in.

5. Thoroughly clean the system before oil change: After draining the old oil, flush the hydraulic oil tank and pipelines with new oil of the same model to remove residual impurities. When replacing the hydraulic oil filter element, it is necessary to check whether the filter element is damaged to ensure the normal operation of the filtration system and prevent impurities from entering the new oil.

6. Exhaust and liquid level check after oil change: After adding new oil, start the equipment and let it run idle for 5 to 10 minutes. Operate the hydraulic handle to expel the air in the system to prevent cavitation. At the same time, replenish the oil to the middle position of the oil tank scale line. If the liquid level is too high, it will easily cause the oil temperature to rise; if it is too low, it will cause the hydraulic pump to be sucked empty.

In conclusion, the maintenance of the hydraulic system of second-hand rotary drilling RIGS requires precise control of the oil change cycle (combining duration and oil condition), scientific selection of oil (matching standards and performance), and standardized oil change operations. Paying attention to these details can effectively reduce the risk of hydraulic system failure and ensure the long-term stable operation of the equipment.