For new machines, the higher cost -effectiveness of second -hand excavators will undoubtedly become the first choice for consumers.The second -hand excavator on the market is mixed, so consumers must understand the purchase of second -hand excavators.We can buy second -hand excavators by checking the fighting and moving arm, checking the hydraulic oil cylinder and the oil pipe, pay attention to the body welding area, check the rubber track and chassis, driving operation inspection, driving operation inspection and other methods.Get up and learn about it.
Precautions for buying a second -hand excavator
1. Check the bucket and movement arm
The excavator is not always a excavation machine. Sometimes constructioners use them to pile or use them to lay pipes.Therefore, users need to pay attention to the situation of fighting to ensure that there are problems with piles, crushing and walking devices.Another important part is that the bucket oil cylinder is connected to the axis and band, which must be tightly checked in these places.Many problems are caused by negligence and inspection.Another key point is to carefully check the part of the rear arm and the excavator. If the connection wear under the rear arm is excessive, it may cause the value of the loss of the entire platform.
2. Check the hydraulic oil cylinder and oil pipe
Oil leakage means that it is possible to check the hydraulic oil cylinder and oil pipes by polluting the entire oil path.The best case is that the surface of the chrome chrome of the hydraulic oil cylinder has no traces of abrasion, deresses or oil leakage.If there is a hydraulic oil, the dust may have contaminated the hydraulic system.It is also necessary to confirm that the oil cylinder wall is not damaged or has a dental.The gap between the oil cylinder and the cylinder wall is very small. As long as there is a debris in the pipe, it will cause a large amount of metal dandruff due to wear during operation and remain in the hydraulic system.
3. Pay attention to the body welding place
Check out whether there are cracks on the excavator and welding traces left during non -original manufacturing. These things indicate that the machine has been excessively used.Another good method is to place a straight plate in the position of the back arm and the hip pole to see if there is any dislocation or distortion.Pay special attention to the repair of excess steel plates. There may be some scratches and deresses on the second -hand excavator, but if there are too many patch on the machine, it may mean that this device has been used for a long time.
Precautions for buying second -hand excavator purchase 2
1. Check the rubber track and chassis
The rubber tracks on a small excavator are different from the steel trackets on large machines. It is suitable for grass and lanes.Many times users do not check the wear of rubber tracks up close like checking the steel crawler.As a result, only the wear of the rubber track, without seeing a large amount of wear on the sprocket and the trap. It can be estimated by checking the cracks on the rubber track and the wear of the edges.The lines are the same.
Due to the different ways of use and soil conditions, the working life of rubber tracks is also very different.In general, its average life expectancy is about 2,000 hours.However, if you work in a rock or easy to wear, the service life will be halved at this time.Conversely, the life life of the better environment will double.
When the user checks the crawler and chassis, dont forget to drive the oil level and cleanliness.This part is easy to be ignored, and it usually leaves very little oil.If the amount of oil is already very low, and water or other things enter, it will cause greater trouble.
2. Driving operation inspection
After the engine preheats, the tilt machine makes it stand by the track on one side, and rotate the tracks on both sides to stand.Note how many such actions can be completed in 30 seconds or 60 seconds, and then compare with other tracks.The track walking device of the excavator is a built -in traffic table. If the two do not have the same traffic, there will be problems.
Another method of detecting is to run 10 meters on the flat ground. If it is running a straight line, you can know that the walking device on both sides is as good as it is.Also check the rotary gear and rotary bearings.Under normal circumstances, the upper part can be smoothly activated and can be stopped accurately, only a small amount or no deviation.For small excavators, its rotating gear and rotating bearings should have the same life as the machine, so you must pay attention to any issues about this part.
3. Check the engine cover
Driving operation inspection, you should open the engine cover and check whether there are signs of smoke in the exhaust pipe. You can pull out the oil ruler and check whether there are smoke.Too many smoke usually indicate that the piston ring needs to be replaced, and it may not be long before the engine will be repaired.
Check the air filter device and all the pipes and pipe clips.As long as a little dust is enough to destroy the entire engine.Pay attention to the dust or dirt accumulated by the terminal, and also check the fan to ensure that the belt is tightened. Check the heat sink to ensure that it is cleaned, and the cooling system and the air intake system are likely to cause the engine to overheat, thereby shortening the life of the machine.
Basic inspections also include checking the heat sink and engine oil, checking the corrosion of the battery, and checking whether there are obvious leakage around the engine.Small machines are used more in special environments, such as buried wire engineering, tube laying, ditch digging operations, etc. The time they use each year is relatively short.However, the small excavators rented by the rental company are used for a long time every year, and the life of the machine will be relatively short.
Precautions for buying for second -hand excavators
1. Dont look at the time to see the car condition
Most buyers pay more attention to the reading of the timetable when buying a second phone. They believe that the condition of mining motorcycles with a short time watch time is good. This habit often changes from the habit of watching mileage in the automotive industry, but the excavatorThe number of hours of the hourly table is not necessarily the real hours. If you buy a machine alone, you may often spend a lot of money to buy a master car.Therefore, buying a second -hand excavator cannot just look at time. Although time is indeed a consideration of buying second -hand excavators, it is definitely not an important factor.
2. Pay attention to the actual wear situation
The chain board, support wheel, and the inside of the small arms are close to the reinforcement of the bucket. The above three pieces can accurately tell you the vicissitudes of the vicissitudes experienced by the excavator. They can tell you that the excavator worked in a hard mine.Still work on the soft deep forest, or on the avenue of urban construction.
Generally, the three major pieces of excavators working in mines are much higher than the excavators of the earthwork in the same hour. Taking two cars with two work for more than 5,000 hours as an example, the difference is that in the chain board of the mineThe spines are not evenly worn enough, and there will be abrupt scars. On the surface of the metal surface, there will be traces of violent bumps by rocks during the excavation process, especially on the inside of the small arm.The reinforced tendons on the inside of the small arm and the inner arms are more delicate and smooth. It is difficult to see the traces of a large area of ??bumps with rock bumps. Such excavators often use the life of the mine to make a hard -working excavator.Buying a soil -based excavator will naturally reduce the cost of large amounts of maintenance and maintenance, thereby increasing income.
3. Pay attention to various indicators of the engine
First of all, check the appearance to see if there is a large area of ??water leakage, oil leakage, whether the freezing liquid is missing, whether the oil is missing, and whether the oil filter element uses the original filter element.Because during the maintenance period, if the master can carefully maintain and use the manufacturers pure accessories for the excavator on time, this will greatly reduce the wear of the excavators components and extend the life of the excavator.
After the oil and anti -freezing liquid inspection, we started the inspection. After the engine was started, first observed whether the engine was running smoothly and whether the downfall was too large.The last is to look at the smoke of the engine. If the blue smoke is rolled, it is the kind of smoke that you feel that the eyes are spicy in front of the exhaust tube.Caused by the failure oil.If the white smoke indicates that the water vapor may be the water vapor, this may be damaged by the cylinder pad.If the black smoke is likely to be damaged by the injector.

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