How to identify a used excavator, analyse a few points:

1, observe the second-hand excavator size arm there is no crack, if there is a crack, it means that the machine was previously used more frequently and strongly, the machine is seriously damaged. Such a machine, even if you buy back, the life is not long.

2, observe the second-hand excavator cylinder there are no traces of bumping, if there is a bump, indicating that the machine is seriously damaged, and the cylinder will keep leaking oil, even if the new oil seal will continue to leak oil in a short period of time, so in the purchase of a second-hand machine, we must pay attention to the problem of the oil cylinder.

3, check the drive wheel, guide wheel, supporting wheel, carrier wheel and track is seriously worn, but also check the chain is not the original, the chain above will generally have a sign, if this sign and the machine information corresponds to the chain is the original, and vice versa, the machine should not be purchased.

4, carefully check the engine, the engine is the heart of the excavator, if the purchase must first listen to the engine there is no noise, whether the power is strong, whether the work of the phenomenon of falling speed, but also into the system to watch, see whether the exhaust is exhaust volume is large, start the engine whether the blue smoke, if everything is normal, you can choose to buy, on the other hand, we must be careful.

5, check the second-hand excavator rotary motor, distributor, to see whether the rotation is strong, whether the rotation of the noise, whether it can better the action of the work. These are very critical in the purchase of a used excavator, be sure to check.

6, buy a used excavator to touch the hydraulic pump, observe whether there is no shock feeling, and then check the hydraulic pump has no cracks, whether there is a serious situation of oil leakage, test drive, observe whether the hydraulic pump is powerful, no noise.

7, check the electrical system, whether the circuits can work normally, and then enter the computer system to check the motherboard, if you enter the system can see the work of the situation, such as the number of revolutions, pressure, maintenance mode, etc., it proves that the computer board is normal.

If you are buying a used excavator, you can not grasp the quality of the used excavator, must pay attention to the above seven points, carefully choose to buy a used excavator.

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How to identify a used excavator, analyse a few points:

1, observe the second-hand excavator size arm there is no crack, if there is a crack, it means that the machine was previously used more frequently and strongly, the machine is seriously damaged. Such a machine, even if you buy back, the life is not long.

2, observe the second-hand excavator cylinder there are no traces of bumping, if there is a bump, indicating that the machine is seriously damaged, and the cylinder will keep leaking oil, even if the new oil seal will continue to leak oil in a short period of time, so in the purchase of a second-hand machine, we must pay attention to the problem of the oil cylinder.

3, check the drive wheel, guide wheel, supporting wheel, carrier wheel and track is seriously worn, but also check the chain is not the original, the chain above will generally have a sign, if this sign and the machine information corresponds to the chain is the original, and vice versa, the machine should not be purchased.

4, carefully check the engine, the engine is the heart of the excavator, if the purchase must first listen to the engine there is no noise, whether the power is strong, whether the work of the phenomenon of falling speed, but also into the system to watch, see whether the exhaust is exhaust volume is large, start the engine whether the blue smoke, if everything is normal, you can choose to buy, on the other hand, we must be careful.

5, check the second-hand excavator rotary motor, distributor, to see whether the rotation is strong, whether the rotation of the noise, whether it can better the action of the work. These are very critical in the purchase of a used excavator, be sure to check.

6, buy a used excavator to touch the hydraulic pump, observe whether there is no shock feeling, and then check the hydraulic pump has no cracks, whether there is a serious situation of oil leakage, test drive, observe whether the hydraulic pump is powerful, no noise.

7, check the electrical system, whether the circuits can work normally, and then enter the computer system to check the motherboard, if you enter the system can see the work of the situation, such as the number of revolutions, pressure, maintenance mode, etc., it proves that the computer board is normal.

If you are buying a used excavator, you can not grasp the quality of the used excavator, must pay attention to the above seven points, carefully choose to buy a used excavator.

Gearbox maintenance

　　The gearbox should be cleaned at least once a season, when cleaning, firstly, in hot condition, stop the car and unscrew the oil discharge screw plug on the side end of the gearbox, release the lubricant in the box, then screw the oil plug on, fill paraffin in the box, start the diesel engine, make the gearbox run at low speed for 2-3 minutes, stop the car and release paraffin, clean the oil plug and screw it to the gearbox (Note: the paraffin must be cleaned and released cleanly so as not to lose the lubricating effect of lubricating oil mixed with residual paraffin), then add new lubricating oil to the oil level to the marking line of the oil level. (Note: the kerosene must be cleanly discharged so that the lubricating oil will not mix with the residual kerosene and lose its lubricating effect), then add new lubricating oil until the oil level reaches the mark of the dipstick.

　　Use No.20 gear oil for the gearbox.

　　It is necessary to check and adjust the positioning devices of the gearshift manipulating mechanism and the reversing mechanism frequently to keep the gears in the proper position so as not to cause the accident of out-of-gear.

　　Frequent attention should be paid to checking the leakage of the seals of the gearbox, and if the seals are damaged, they should be replaced in time.

　　Frequently check the gearbox and frame coupling bolts, tighten when necessary, do not make loose off.

　　Second, the hydraulic system maintenance

　　Check whether the mounting bolts of the filter, valve, motor, oil pump, cylinder, etc. are loose, and whether there is oil leakage at each joint.

　　Observe the oil level gauge on the side of the tank, when the hydraulic oil is too little should add the same grade of filtered hydraulic oil.

　　Hydraulic oil tank half a year to clean and change the oil, add or change the oil, be careful not to mix impurities and dirt into the oil tank, add or change the new oil must be filtered beforehand.

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Gearbox maintenance

　　The gearbox should be cleaned at least once a season, when cleaning, firstly, in hot condition, stop the car and unscrew the oil discharge screw plug on the side end of the gearbox, release the lubricant in the box, then screw the oil plug on, fill paraffin in the box, start the diesel engine, make the gearbox run at low speed for 2-3 minutes, stop the car and release paraffin, clean the oil plug and screw it to the gearbox (Note: the paraffin must be cleaned and released cleanly so as not to lose the lubricating effect of lubricating oil mixed with residual paraffin), then add new lubricating oil to the oil level to the marking line of the oil level. (Note: the kerosene must be cleanly discharged so that the lubricating oil will not mix with the residual kerosene and lose its lubricating effect), then add new lubricating oil until the oil level reaches the mark of the dipstick.

　　Use No.20 gear oil for the gearbox.

　　It is necessary to check and adjust the positioning devices of the gearshift manipulating mechanism and the reversing mechanism frequently to keep the gears in the proper position so as not to cause the accident of out-of-gear.

　　Frequent attention should be paid to checking the leakage of the seals of the gearbox, and if the seals are damaged, they should be replaced in time.

　　Frequently check the gearbox and frame coupling bolts, tighten when necessary, do not make loose off.

　　Second, the hydraulic system maintenance

　　Check whether the mounting bolts of the filter, valve, motor, oil pump, cylinder, etc. are loose, and whether there is oil leakage at each joint.

　　Observe the oil level gauge on the side of the tank, when the hydraulic oil is too little should add the same grade of filtered hydraulic oil.

　　Hydraulic oil tank half a year to clean and change the oil, add or change the oil, be careful not to mix impurities and dirt into the oil tank, add or change the new oil must be filtered beforehand.