Is your excavator hydraulic cylinder leaking oil?

The oil cylinder is a very important object in the hydraulic system. Once the hydraulic oil cylinder of the excavator leaks oil, it will cause the machine to lift slowly and dig weakly, which will seriously affect the work efficiency! What should we pay attention to when using excavators to avoid oil leakage from hydraulic cylinders?

1. External leakage

1. The damage of the seal between the extension end of the piston rod and the piston rod is mostly caused by the pulling of the piston cylinder, and it is also caused by aging.

2. The cracking of the oil cylinder inlet and outlet pipe joints will also lead to the leakage of the hydraulic cylinder.

3. Oil leakage caused by defects on the excavator cylinder block or cylinder end cover.

4. The piston rod is pulled and has grooves, pits, etc.

5. The deterioration of the lubricating oil causes the temperature of the oil cylinder to rise abnormally, which promotes the aging of the sealing ring.

6. Oil leakage caused by frequent use beyond the pressure range of the excavator cylinder.

2. Internal leakage

1. The wear ring on the piston is severely worn, causing friction between the piston and the cylinder liner, and finally straining the cylinder liner, piston and seal.

2. Long-term use of the seal fails, and the piston seal (mostly U, V, Y-rings, etc.) ages.

3. The hydraulic oil is dirty, and a large amount of impurities enter the oil cylinder and wear the piston seal to the worst, usually iron filings or other foreign objects.

Precautions for the use of hydraulic cylinders

1. During normal use, we should pay attention to protecting the outer surface of the piston rod to prevent damage to the seal from bumps and scratches. It is necessary to clean the dust on the oil cylinder dynamic seal dust ring and the exposed piston rod frequently to prevent the difficult-to-clean dirt sticking on the piston rod surface from entering the oil cylinder, thereby causing damage to the piston, cylinder barrel or seal.

2. In normal use, pay attention to frequently check the connection parts such as threads and bolts, and tighten them immediately if they are loose. Looseness in these places will also cause oil leakage from the hydraulic cylinder.

3. Lubricate the connection parts frequently to prevent corrosion or abnormal wear in the oil-free state. Especially for some parts with rust phenomenon, it should be dealt with in time to avoid oil leakage of hydraulic cylinder due to rust.

4. During normal maintenance, the hydraulic oil should be replaced regularly, and the system filter should be cleaned in time to ensure the cleanliness of the hydraulic oil, which also plays a very important role in prolonging the service life of the hydraulic cylinder.

5. Every time we use the excavator, we need to carry out a test run of full extension and full retraction for 3-5 strokes before starting work. The purpose of this is to exhaust the air in the system and preheat each system, so as to effectively avoid the existence of air or water in the system and cause gas explosion in the cylinder block, which will damage the seals and cause leakage in the cylinder, etc. Fault.