1, excavator-sized arm, observe excavator’s arm and small arm there are no cracks, welded marks, if there are cracks, prove that the machine previously dry working conditions are relatively bad, the machine is seriously damaged. such a machine is not easy to take care of even if it is bought back.
2, observe the cylinders have no traces of bumps, if there is a bump, prove that the machine has been seriously damaged, the cylinder will continue to leak oil, even if the new oil seal will continue to leak oil in a short period of time, so in the purchase of two mobile phones, check the cylinder is also very important.
3, check the four-wheel area, first observe the drive wheel, guide wheel, support wheel, lifting wheel, and track wear are serious. secondly, check whether the chain is original, there is a sign on the chain, if this logo and machine information corresponding, indicating that the chain is original, if not consistent, prove that the chain has been replaced, the machine may wear more serious, so to buy carefully.
4, the engine is commonly known as excavator “heart”, so in the purchase of two mobile phones must carefully check the engine, test drive when listening to the engine has no noise, power is strong, work whether there is a drop in speed phenomenon, but also can enter the system to watch, see if the exhaust volume is large, if the exhaust volume is too large to prove that the engine working time is long, need to be overhauled.
5, Used excavato,you have to check the rotating motor, observe whether the rotation is powerful, whether the rotation is a lot of noise, if the noise needs to observe which part of the noise, and then carefully observe whether there is a gap in the rotating chassis, and secondly to carefully observe the excavator dispenser, because the function of the distributor is mainly to control the action of the work, so driver must see whether the excavator work action is coherent, whether there is a pause.
6, the hydraulic pump is the power element of the hydraulic system, its role is to convert the mechanical energy of the original motive into liquid pressure energy, the hydraulic system of the oil pump, it provides power to the entire hydraulic system. therefore, the hydraulic pump inspection is also very important, to buy two mobile phones to touch the hydraulic pump by hand, to observe whether there is a shock feel, and then check whether the hydraulic pump has cracks, whether there is a serious oil leakage situation, test drive, to observe whether the hydraulic pump is strong, no noise.
7, check the electrical system, whether all circuits can work properly, and then enter the computer system to check the motherboard, if you can see the work after entering the system, such as the number of revolutions, pressure, maintenance mode, etc., then prove that the computer board is normal.