Engine aspect. The engine can start smoothly, run smoothly, idle steadily, no abnormal noise; the engine lubrication, cooling, exhaust system components should be intact, and run well; the hydraulic oil pressure is normal.
Braking performance. It should meet the requirements of GB/T9139.1, that is, parking brake on a slope not less than 40%, then turn the excavator around 180 degrees, parking brake for 5 minutes in two states respectively, to ensure that the equipment does not slip (the working device of the excavator should be in the transport position during the test).