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Oil leakage of breaker must be a headache for many excavator owners, so what are the reasons for oil leakage of hydraulic breaker? Analyze the oil leakage problem of the hydraulic breaker from different parts and break them one by one.
1. Oil leakage at the piston:
⑴ Ask how to maintain the hydraulic breaker? The body was disassembled and inspected, and it was found that a large amount of hydraulic oil leaked and the hydraulic oil was very turbid. There was a large amount of butter and hydraulic oil mixture between the tail bushing and the piston.
Reason: The method of filling the butter is incorrect. Replace the sealing components in time to tell the customer the correct way of filling the butter. When adding butter, the hydraulic breaker should be placed vertically and the drill rod should be pressed tightly. Don't hang it in the air, that is, fill when the drill rod is close to the piston, and fill it appropriately until there is moist butter on the drill rod.
⑵ It is found that the hydraulic oil leaks and the hydraulic breaker shell is corroded seriously. After inquiring, it was found that the customer did not use the hydraulic breaker for a long time, but did not store the hydraulic breaker correctly, which caused water erosion. The rust directly corroded the piston seal, damaged the seal assembly, and caused oil leakage.
Inform the customer about the correct storage method when the hydraulic breaker is not in use for a long time: the nitrogen in the nitrogen chamber must be discharged, the piston is returned to the cylinder, and the steel is pressed in. The upper cylinder should be higher than the lower end. See the instruction manual for details.
⑶ Observe the operation video of the hydraulic breaker. If there is a large amount of excavation, a lot of small debris will be brought into the shell, which will cause the wear of the piston seal and cause oil leakage.
Inform the customer to explain the correct operation method to prevent small debris from entering the inside of the shell.
2. Oil leakage at the joint between the nitrogen chamber and the middle cylinder body:
means that the sealing ring at the joint between the nitrogen chamber and the middle cylinder body is worn out, and it should be dealt with in time.
3. Oil leakage at the base of the reversing valve and the middle cylinder body
It shows that the O-ring of the directional valve base is damaged, and it should be replaced in time.
4. The connecting surface of the middle cylinder body and the oil pipe interface
Note: The O-ring seal is worn or the tubing body interface is loose.
Conclusion: Replace the O-ring and tighten it according to the specified torque.
5. Oil leakage at the interface between the middle cylinder and the upper cylinder
It shows that the O-ring and the seal ring reinforcement ring are worn and strained, and the screws of the breaker body are loose.
Replace O-ring seal ring and reinforcement ring in time, and set the tightening torque.
6. Oil leakage at the connection between the control valve box and the control valve cover:
indicates that the O-ring is worn and the control valve cover screw is loose.
Replace the O-ring and tighten it with torque.
Of course, in addition to the above reasons, the oil seal is aging, the hydraulic oil is too dirty, causing strains, the bushing gap is too large, the oblique hitting, and the damage to the oil film can also easily cause oil leakage.
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