Now the general people are buying second-hand excavators, but the risk of buying second-hand is still existence, then how to choose a second-hand excavator, pay attention to the following aspects to observe the second hand excavator:
The appearance of a secondhand excavator
Observe carefully whether the sealing strip of the door frame and machine window is painted. Any new paint marks underneath the defects that do not want to be known; check the rack welding points under the cover of the second hand excavator and see if the second-hand excavator has been out of the accident. When choosing a secondhand excavator. The original welding spot is smooth and small, and the welding points after adding are rough and irregular. If the latter welding point is presented, it is indicated that the second-hand excavator has had serious accidents. And there is no deformation in the cab from the side. If it is distorted, it means that the excavator had happened.
Used excavator caterpillar
The wear level of track can reflect the frequent use of a second-hand excavator. If the crawler is flat, observe the wear level of the crawler. There is no edge on the edge. It shows that the primary driving machine of the original excavator has a high frequency and is not very cherished, so it is not only poor in its own performance, but also reveals a lot of problems in the whole condition of the whole second hand excavator. If it's not the original track, it means the car has done so much work that the track has been changed. The chain also shows the working condition of the second-hand excavator.
Mechanical parts of second hand excavator
First of all, observe whether there is any trace of the start and hydraulic pump, and if necessary, we should pay attention to it. Observe the color of the exhaust gas. If the exhaust gas is translucent and pale gray, observe the appearance and operation of the engine. Check carefully whether there is any leakage of oil outside the engine. Ignite the engine. It indicates that the engine is in good working condition; if it is blue, it indicates that the engine is very tired; if it is red, it indicates that the cylinder gasket is going to be scrapped. The engine and the hydraulic system have no noise, the throttle to the minimum, the roof up, look at the car in the car, there is no force, if the car flameout, that the car has no power.
Second hand Komatsu PC200-8 excavator test machine explanation summary: Komatsu PC200-8 excavator single action slow weakness phenomenon: Komatsu 200-8 excavator to work a single action slow, weak or excavate the whole vehicle speed is too slow, what is the reason? The reason why the single action of the PC200-8 excavator is slow and slow: 1 if a single action is slow in the work of the excavator (slow walking, slow arm lifting, slow arm lifting, etc.) or the whole vehicle. If there is a slow phenomenon of a single action (slow walking, slow lifting, slow arm lifting, etc.) or too slow speed of the vehicle, it is likely that the overflow pressure of the excavator is too low in 1 digging machine.
2 Komatsu PC200-8 excavator overflow pressure should be adjusted? First adjust low overflow pressure, two level overflow pressure will be automatically set. Unlock the lock nut, adjust the pressure by rotating the holder. Turn right, pressure rise. Turn left, pressure drop. 69kg/cm2. small pine excavator maintenance master, "Komatsu PC200-8 dug" per circle adjustment quantity. The micro operation performance is poor when PC200-7 is working. The main overflow pressure of the oil pump is 320kg/cm2, the LS pressure difference joystick is 35kg/cm2, the speed HI walks empty, the full throttle, and the 26kg/cm2. should restore the machine to normal by adjusting the PC valve when the joystick is half stroke. What are the conditions for PC200-8 to meet the two level overflow condition? When the 1 slewing lock switch is ON 2 contact force, when the 4 moving arm drops in 5 L mode when 3 walks.
