Avoiding the excavator's track derailment. On the one hand, the driver needs to pay more attention when driving the excavator to turn. If he finds signs of the initial derailment of the track, he should lift the track and idle it. On the other hand, the frequent derailment of the track also indicates that the chassis itself has a problem and needs to be repaired. There are many reasons for excavator derailment, but they can basically be classified into three categories.
First, because the four-wheel belts are not on the same plane, causing the track to derail.
The cause of the problem is mostly at the guide wheel, because only the guide wheel can move back and forth among the four wheels (guide wheel, roller, drive wheel, support chain wheel), and the wear of the moving parts and the center axis of the guide wheel will cause The guide wheel swings left and right, causing the track to deviate. This shows that the excavator needs to replace the guide wheel.
Second, the track is too loose, causing the track to deviate.
The elasticity of the crawler is adjusted by the tensioning cylinder pushing the guide wheel, and the tensioning cylinder is pushed by the grease gun to adjust the elasticity of the crawler, but in many cases the crawler cannot adjust the elasticity. For example, 1. Leakage of the oil seal of the tensioning cylinder will cause the track to be too loose and cannot be adjusted, which requires replacing the oil seal of the tension cylinder. 2. Oil leakage from the chain nozzle will also cause the crawler to be unable to be adjusted, and the chain nozzle needs to be replaced. 3. In addition, the spring break at the tensioning device will also cause the track to be too loose. It will be a little difficult to replace this large spring. Professional tools are required. 4. Excessive wear or wear of the pin bushings of the track chain causes the total length of the track to increase and also causes the track to become too loose. If the chain rail pin sleeve is not worn through, you can cut off a track. If the chain rail pin sleeve is worn out, the pin sleeve of each section must be replaced, but now it seems that few people now "press the chain rail" to replace the pin sleeve, more often directly replace the chain rail.
3. Due to the wear of the chain guard, it will not work and the track will deviate.
If you compare the chassis of an excavator with a bulldozer, you will find that some places are different. The bulldozer rarely falls off the chain even if the crawler is loose. That is because the chain guard of the bulldozer is a whole piece from the drive wheel to the guide wheel. , All the rollers are wrapped, and the excavator has only two and small chain guards, one in the middle of the roller position and one in the guide wheel position. Once the chain guard is worn, the chain rail can easily slide out of the chain guard, causing the track to derail. At this time, it is necessary to repair or replace the chain guard.
