The newly purchased excavator has not done much work, but why does it always fail? Some excavator failures are accumulated due to long-term improper operation.
- The working device is not fully recovered before walking.
If the working device is not fully retracted, the bucket will easily hit the rock, and the piston rod of the oil cylinder will generate a large load, resulting in damage to the inside of the oil cylinder and cracking around the pin shaft.
- Excavation with walking force.
After the hydraulic oil is mixed with water, it is easy to emulsification and deteriorate, and entering the hydraulic system will cause the parts to rust. The rust slag flows in the hydraulic system for a long time, the hydraulic pressure will be affected, and the action of the big arm and the bucket will become weak.
- The cylinder rod is extended to the limit for excavation.
The hydraulic cylinder is stretched to the end position. In this case, the working cylinder and the frame will generate a large load. The impact of the bucket teeth and the impact of each shaft pin will cause damage to the inside of the cylinder and affect other hydraulic components.
- The rear of the crawler floats up for excavation work.
The excavation work is carried out by utilizing the force of the rear of the excavator body floating. When the bucket is separated from the rock and the vehicle body falls, a large load is generated on the bucket, counterweight, frame, slewing bearing, etc., which is easy to cause damage.
- The excavator starts work before it stands firm.
On the gravel road with uneven road surface, the excavator starts to work under the condition that the excavator is not stopped steady, which will cause uneven stress on the lower frame for a long time, causing damage to the lower frame. It is best to pad some soil below to make the ground stable, and then work again.
Oil cylinder maintenance method.
- The hydraulic oil should be replaced regularly when using the cylinder, and the system filter should be cleaned to ensure the cleanliness and prolong the service life.
- It is necessary to conduct a test run of full extension and full retraction for 5 strokes and then run with load each time. This can exhaust the air in the system, preheat each system, and effectively avoid the existence of air or water in the system, which will cause gas explosion (or scorch) in the cylinder block, this will damage the seals and cause leakage in the cylinder.
- Control the temperature of the system well. If the oil temperature is too high, the service life of the seal will be reduced, and the long-term high oil temperature will cause the seal to be permanently deformed or even fail completely.
- Protect the outer surface of the piston rod to prevent damage to the seal from bumps and scratches. Always clean the dust ring of the oil cylinder dynamic seal and the sediment on the exposed piston rod to prevent the sticking dirt on the surface of the piston rod that is difficult to clean up entering the inside of the cylinder to damage the piston, cylinder barrel or seals.
- Check the connection parts such as threads and bolts regularly, and tighten them immediately if they are loose.
- Lubricate the joint parts to prevent corrosion or abnormal wear in the oil-free state.