Compared with new machines, the high cost performance of second-hand excavators is the main reason for buyers to choose. There are many second-hand excavators in the market, so we must understand the purchase methods of second-hand excavators in order to choose a suitable second-hand excavator. This article will explain the start-up operation inspection and check which parts of the engine cover should be checked when purchasing a second-hand excavator, which is for reference only.
1. Startup operation inspection
One detection method is to tilt the excavator to stand on only one track after the engine is preheated and started, and then rotate the tracks on both sides to stand in turn. Note how many such actions can be completed in 30s or 60s, and then compare with other tracks. If the track walking device of the excavator completes the action differently on both sides during the inspection, there may be a problem with the excavator.
Another detection method is to drive the excavator on the flat ground for 10m. If it runs in a straight line, it can be proved that the running conditions of the walking devices on both sides of the excavator are the same. Also check the swing ring gear and the swing bearing. Under normal circumstances, the upper part can start the rotation smoothly and stop accurately, with only a small amount or no deviation. For small excavators, the slewing gear ring and slewing bearing should have the same long service life as the excavator.
2. Check the engine hood
For startup operation inspection, open the engine hood and check whether there is smoke in the exhaust pipe. Pull out the dipstick and check whether there is smoke. Too much smoke usually indicates that the piston ring needs to be replaced, and the engine may need to be fully inspected and repaired.
Check the air filter and all pipes and clamps. If there is dust, the engine is very easy to damage, so pay attention to the dust or dirt accumulated at the terminal. Also check the fan to ensure that the belt is tensioned. Check the radiator to make sure it is clean. Ignoring the cooling system and air intake system may cause the engine to overheat and shorten the service life of the excavator.
The basic inspection also includes checking the radiator fluid and engine oil, checking the corrosion degree of the battery, and checking whether there is obvious leakage around the engine.
