If you want to buy a second-hand excavator, look at the time of the excavator. Liugong's excavator parts manufacturer thinks that you must ask a qualified old machine operator to help, and then carry out a test run. When buying a second-hand machine, don't be greedy for cheapness. The price of the machine is much lower than what you expected, so there must be some tricks in it, so you should be cautious when buying a car.

　　 When you buy anything, what you see at the top of the list is the appearance, and the excavator is the same. Experienced users can estimate the use of the car, how many hours of work, and the degree of wear and tear. So what does the appearance look like, and how do you look? This is also a problem that many users worry about. Next, Liugong excavator parts manufacturers will introduce to us what parts of the appearance look.

　　 The top of the list is the large and small arms of the excavator. Investigate whether there are cracks on the boom and forearms of the excavator, and welding marks. If there are cracks, it proves that the machine was in a bad working condition and the machine was severely damaged. Even if such a machine is bought back, it is not easy to take care of.

Second, investigate whether each cylinder has any signs of bumps. If bumps appear, it proves that the machine has been severely damaged in the past. The cylinders will keep leaking oil. Even if a new oil seal is replaced, the oil will continue to leak in a short time. It is also important to check the cylinder when buying a used machine.

　　 Third, look at the four-wheel area, first investigate the driving wheels and guide wheels.

Fourth, the launcher is commonly known as the "heart" of the excavator, so you must carefully check the launcher when buying a second-hand machine, and listen to whether the launcher is noisy, whether the power is strong, and whether there is a speed drop during work. At the same time, you can enter the system to watch to see if the exhaust volume is large. If the exhaust volume is too large, it proves that the initiator has a long working time and needs to be overhauled. In addition, investigate whether blue smoke is emitted when the initiator is initiated. In the future, if the initiator presents the illusion of smoking before starting to work, it proves that the initiator has the problem of burning oil.

Fifth, when buying a second-hand machine, check the rotating motor, investigate whether it is rotating powerfully, and whether it announces a lot of noise during rotation. If the noise is required, investigate which part of the noise is announced, then carefully investigate whether there is a gap in the rotating chassis. The distributor of the excavator must be carefully investigated. The function of the distributor is mainly to control the actions of various tasks. Therefore, when you buy a second mobile phone for a test run, you must see whether the various work actions of the excavator are connected and whether there is a suspension. The test method is to dig up a bucket of soil and raise the highest point to investigate whether each cylinder is leaking. These precautions are very important when buying a used car, so you must choose the car carefully.

　　 Sixth, the hydraulic pump is the power element of the hydraulic system. Its function is to convert the mechanical energy of the prime mover into liquid pressure energy. The oil pump in the hydraulic system supplies power to the entire hydraulic system. Therefore, the inspection of the hydraulic pump is also very important. When buying a second mobile phone, it is necessary to touch the hydraulic pump with your hands to investigate whether there is any sensation of shaking hands, and then check whether the hydraulic pump has cracks and whether there is a serious oil leakage condition. Perform a test run and investigate the hydraulic pump. Whether it is powerful and no noise.

Seventh, check the electrical system, whether all circuits are working properly, and then enter the computer system to check the motherboard. If you can see various working conditions after entering the system, such as speed, pressure, maintenance mode, etc., it proves that the computer board is normal .