Hydraulic feed cylinder repeatedly leaking oil change the oil seal doesn't help

Hydraulic feed cylinder repeatedly leaks oil

Hydraulic parts can be said to be the largest precision parts of an excavator except for the engine. The efficient operation of the entire hydraulic system can ensure the efficiency and stability of the excavator construction.

Therefore, no matter how many or small faults the hydraulic system encounters, the owner will quickly find an engineer to solve the problem, but the editor wants to know that everyone will spend a lot of money when they encounter such a simple problem as hydraulic feed cylinder oil leakage. Do you need a repairman for the repair fee? Take a look at what the owner of the machine did below.

Tault phenomenon

Compared with other hydraulic system failures, the problem encountered by the owner is relatively simple. The hydraulic feed cylinder of his excavator has oil leakage. Because the time to maintain the excavator is not short, the owner currently judges that it should be the end of the hydraulic cylinder. Seal failed.

Troubleshooting process

1. According to the observed phenomenon, combined with past experience, the owner first replaced the seal of the hydraulic cylinder, the problem was temporarily solved, but oil leakage occurred after a short period of use.

2. Only replacing the seals did not solve the fault, so the owner directly replaced the new repair kit, but the same fault phenomenon appeared again soon.

3. Analyze the root cause, the problem is not on the piston of the hydraulic cylinder, but on the seal at the end of the hydraulic cylinder.

4. During careful inspection, it was found that there were many pits and grooves formed by wear on the sealing surface of the guide sleeve, which increased the sealing gap between the guide sleeve and the piston rod, and could not achieve a decompression effect, thus making the high pressure inside the hydraulic cylinder. The oil directly impacts the primary and secondary seals.

It is conceivable that the sealing ring was washed away in a very short time under the action of high-pressure oil, so the oil leakage was not repaired repeatedly.

Summarize

Through the whole fault handling process, many old drivers can also understand why they have replaced new parts when they usually deal with the fault, but the problem has been repeatedly repaired.

Because the hydraulic system is full of precision parts, each part must be interlocked, so when you replace the hydraulic feed cylinder repair kit, you can not only replace the seals, but also pay attention to check the related components. This small detail is applicable to more than 90% of the failure problems of excavators, and I hope it can give you a reference.