Compared with new machines, the high cost performance of second-hand excavators is the main reason for buyers to choose. There are many second-hand excavators in the market, so we must understand the purchase methods of second-hand excavators in order to choose a suitable second-hand excavator. This article will explain how to buy second-hand excavators by checking bucket and boom, hydraulic cylinder and oil pipe, rubber track and undercarriages. It is for reference only.
1. Check the bucket and boom
The bucket of excavator is not only used for excavation, but also sometimes used for piling or laying pipelines. Therefore, when purchasing second-hand excavators, we need to pay attention to the situation of the bucket to ensure that there are no problems with the piling, breaking and walking devices. Be sure to check the tightness of the connecting pin and bushing of the bucket oil cylinder. Many problems are caused by neglect of maintenance and inspection. And carefully check the connection between the rear arm and the excavator. If the connection under the rear arm is excessively worn, it may cause the loss of the value of the excavator.
2. Check the hydraulic cylinder and oil pipe
If the excavator leaks oil, the whole oil circuit may be polluted. Therefore, it is very important to check the hydraulic cylinder and oil pipe. In the best case, the chrome plated surface of the hydraulic cylinder has no scratch, dent or oil leakage. If hydraulic oil seeps out, dust may have polluted the hydraulic system. Also make sure that the cylinder wall is not damaged or dented. The gap between the oil cylinder and the cylinder wall is very small. If there are sundries in the pipeline, a large number of metal chips will be produced due to wear during the operation of the oil cylinder and remain in the hydraulic system.
3. Check the rubber track and undercarriages
The rubber track of small excavator is different from the steel track of large excavator. It is suitable for grass and driveway. It is necessary to check not only the wear of rubber track, but also the wear degree of track roller and carrier roller. The service condition of the rubber track can be estimated by checking the cracks on the rubber track and the wear of the edges.
Due to the different use methods and soil conditions, the working life of rubber track is also very different. The average service life of general rubber track is about 2000 hours. However, if you work in an environment with rocks or easy to wear, the service life will be halved. On the contrary, if you work in a better environment, the service life will be doubled accordingly.
When checking the track and undercarriages, you need to drive to check the oil level and cleanliness. If the amount of oil is very low and water or other things enter, it will cause more trouble.
