1. look at the number of tubing replaced by the car, the less it proves that the car is newer.
2. whether the engine is leaking oil, when the throttle is excavated, whether the machine works normally is black smoke, whether the voice is abnormal or not.
The strength of the 3. major pumps, the engine is idle, the fuselage, can not be jacked up for the pump is not strong or top engine sound is abnormal engine power shortage. Increase the throttle and extend all cylinders to see if the pump is changing.
4. chain chain plate testing. (this is relatively simple)
5. turn around, up and down clearance check, allowing a little clearance around, but up and down will not do.
6. check the working speed of the normal throttle.
7. all the oil cylinders were examined, and there was a scar.
8. walking inspection, lifting the single side, walking according to the high speed mode ears close to the driving wheel to hear whether the voice is abnormal.
The above inspection methods also need the working experience of the excavators who have the experience of the year to realize that it is not easy to operate a excavator now, I hope these skills can be useful to you.
