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The piston rod is a connecting piece that supports the piston for work, and is often used for moving parts such as oil cylinders and cylinders. It is a frequently moving and technically demanding moving component. Taking hydraulic oil cylinder as an example, it is composed of cylinder barrel, piston rod (cylinder rod), piston, and end cover. The processing quality directly affects the lifespan and stability of the entire product.
The reason for the automatic extension of the piston rod is that the valve core is stuck, which should be related to the automatic extension of the piston rod. The seal inside the stuck cylinder is likely to be severely damaged. Therefore, the internal leakage test of the stick cylinder is carried out as follows: restore the main control valve of the stick cylinder to normal; When the stick cylinder extends to the end of the stroke, remove the oil inlet hose with the rod chamber; After the engine starts, operate the pilot control valve handle to continuously supply oil to the stick cylinder without entering the rod chamber. Observe whether the rod chamber is leaking oil. The test results indicate that a large amount of hydraulic oil flows out from the oil port of the stick chamber, indicating that the seal inside the stick cylinder has been severely damaged.
When inspecting the hydraulic oil tank, it was found that there were also a large amount of iron filings at the bottom of the tank. After the bucket rod oil cylinder is damaged, a large amount of iron filings generated by scraping on the inner wall are adsorbed on the oil inlet filter element, causing insufficient oil supply during the main pump suction and generating a whistling sound. Replaced a new stick cylinder, carefully cleaned the hydraulic oil tank, and replaced the hydraulic oil and inlet and return filter elements. After installation and debugging, the excavator returned to normal performance after 100 hours of trial operation.