Precautions for the most popular purchase of secon

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Precautions for purchasing second-hand construction machinery

precautions for purchasing second-hand construction machinery:

(I) second hand construction machinery is generally cheaper, but it should be paid attention to when purchasing

1. Many do not have San Bao services. For example, the hydraulic servo control lever of excavator is better than the old-fashioned control lever, and the bulldozer is sometimes not equipped as standard

2. Of course, you also want to find a device with an articulated boom, which is convenient for working close to buildings and auxiliary pipelines

3. Zero tail rotation is particularly important for constructors who need to work in a compact environment to keep clean; Yes

(II) about bucket and boom:

1. Excavators are not always used as a kind of excavation machinery. The constructors will soon make in-depth changes in the industry pattern. When they enter clinical use, they will be used to pile or lay pipelines. Therefore, you need to pay attention to the condition of the bucket to ensure that there are no problems in the piling, crushing and walking devices

2. Another important part is the connecting pin and bushing of the bucket cylinder. Be sure to check the tightness of these places. Many problems are caused by neglect of maintenance and inspection. When you start the machine to move the bucket, stick and rear arm, you may see the movement of the pin shaft or cylinder, but the stick and bucket do not move. This is caused by the looseness of the pin shaft and bushing

3 adopt new composite materials. Another key point is to carefully observe the connection between the rear arm and the excavator. If the connection under your rear arm is excessively worn, it may cause the loss of the value of the whole equipment

(III) it is very important to check the hydraulic cylinder and oil pipe:

1. Oil leakage means that the whole oil circuit may be polluted. The best case is that the chrome plated surface of the hydraulic cylinder has no scratch, dent or oil leakage. If hydraulic oil leaks out, it means that dust may have polluted the hydraulic system

2. Also make sure that the cylinder wall is not damaged or dented. The gap between the oil cylinder and the cylinder wall is very small. As long as there is a sundry in the pipeline, it will cause a large number of metal chips to be generated due to wear during the operation of the oil cylinder and remain in the hydraulic system

(IV) be alert to the welding on the body:

1. Carefully check whether there are cracks on the excavator and welding traces left during non original manufacturing, which indicate that the machine has been overused

2. Another good method is to put a straight plate on the position of the rear arm and the stick to see if there is any dislocation or distortion. Special attention should be paid to the repair of excess steel plates

3. There may be some scratches and dents on the second, but if there are too many patches on the machine, it may mean that the device has been used for a long time

(V) rubber track and chassis:

1. The rubber track on small excavators is different from the steel track on large machines. It is suitable for grass and driveways. Most of the time, you don't check the wear of rubber tracks closely like checking steel tracks. As a result, you only see the wear of the rubber track, but do not see a lot of wear on the sprocket and idler

2. The service condition of the rubber track can be estimated by checking the cracks on the rubber track and the wear of the edges. At the same time, pay attention to the height of the ribs, just like paying attention to the tire lines when looking at the tire wear. Due to the different ways of use and soil conditions, the working life of rubber track is also very different. Generally speaking, its average life span is about 2000 hours. However, if you work in a rock or easily worn environment, the service life will be halved at this time

3. On the contrary, the working life will be doubled in a better environment. When you check the tracks and chassis, don't forget to drive and check the oil level and cleanliness. This part is easily ignored, and usually there is little oil left. If the oil volume is already very low, and water or other things enter, it will cause greater trouble

(VI) it is best to have people in the industry participate in the evaluation

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