How To Inspect The Hydraulic System of A Second-hand Rotary Drilling Rig? Just Look at These Three Details And It's Enough

The hydraulic system is the "blood vessel" of a second-hand rotary drilling rig, and its condition directly affects the performance and lifespan of the equipment. When inspecting the machine, grasping the key details can help quickly determine the true condition of the hydraulic system and avoid making mistakes.

1. Observe the state of the hydraulic oil. If the oil is cloudy and contains metal debris, it indicates that the internal components are severely worn. If the oil level is abnormally low and there is no leakage point, there may be a hidden fault.

2. Inspect the oil pipes and joints. Aged and cracked oil pipes are prone to burst. If there are multiple disassembly and assembly marks at the joint, it may be due to repeated maintenance because of seal failure.

3. Pay attention to the sound of the hydraulic pump. After startup, if the pump body makes sharp abnormal noises, it is mostly due to wear of internal parts. The sound is sometimes loud and sometimes soft, which may indicate a cavitation problem.

4. Check the appearance of the oil cylinder. Scratches or depressions on the surface of the cylinder barrel can easily lead to damage of the sealing parts. Rust on the piston rod may be due to long-term idleness without maintenance.

5. Test the action response. If the actuator responds slowly during operation, it might be due to the valve group being stuck. The movement is sometimes fast and sometimes slow, suggesting unstable pressure in the system.

6. Check the hydraulic oil tank. Excessive impurities accumulated at the bottom of the fuel tank indicate that the oil has not been replaced for a long time. There is rust on the inner wall, which may cause emulsification due to water ingress.

In conclusion, when inspecting the hydraulic system of a second-hand rotary drilling rig, one should start from multiple aspects such as oil, components, sound, and performance. Accurately capturing details can effectively assess the degree of system wear and tear, providing a reliable basis for equipment selection.