Excavator's crawler track deviates, which means that the track has deviated from the track composed of guide wheels, rollers, drive wheels and carrier sprockets, commonly known as "dropping the chain", which is unwilling to be seen by the excavator driver and the owner Scene. On the one hand, to avoid track derailment, the driver needs to pay more attention when driving an excavator to turn. If he finds signs of initial track derailment, he should lift the track to idle. 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 the track derailment, but they can basically be classified into three categories.
One, because the four-wheel belt is not on the same plane, which causes the track to deviate, the cause of the problem is mostly at the guide wheel, because only the guide wheel among the four wheels (guide wheel, roller, drive wheel, carrier chain wheel) It can move back and forth, wear of moving parts and wear of the central axis of the guide wheel will cause the guide wheel to swing left and right, causing the track to derail. 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. 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. This 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 adjust. Need to replace the chain nozzle. 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 needed. 4. Excessive wear or wear of the pin sleeves of the track chain tracks increases the total length of the track and also causes the track to be 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 directly replace the chain rail.
Third, due to the wear of the chain guard, it will not work, causing the track to derail. If you compare the chassis of an excavator and 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 only has two and small chain guards, one in the position of the middle roller and one in the position of the guide wheel. Once the chain guard is worn, the chain rails 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.