There are abnormal reasons and solutions to the excavator slewing bearing

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In construction construction, excavators often appear, not only its crawlers are not afraid of some potholes, but also because excavators can rotate left and right, it is very convenient to dig pits and fill soil. There will be a variety of problems with the reckless support of the excavator, and there are more abnormal noises. Then let’s take a look at the reasons and solutions why the excavator rotation support has abnormal noise!
Slewing ring
The reasons and solutions of the excavator’s rotation support

1. Inlerance of installation, loose screws installed

When there is abnormal noise, it is necessary to determine whether it is not installed enough to meet the requirements of the machine’s use, which causes a gap in the rolling road, which leads to abnormal noise. In addition, when the small gear bite process is not tight enough, it is not tight enough There is also the possibility of generating abnormal noise. In severe cases, the gear breaks; in addition, when the bolt of the fixed reckless support is loose, it will also cause the gap between the elastic deformation of the rotation support. At this time Essence

2. There are foreign bodies inside the internal inheritance

When the inside of the rotation support enters the foreign objects such as sand and gravel, iron Mozi, at this time, not only will there be a strange vibration sound, but also the problem of stuttering in the west of the rotation direction. Therefore, if we want to avoid this situation, we must not only clean up the bearings and matching parts before installation, but also remember to clear the foreign objects in the lubricant in time; The shelf, so that we can remove the corresponding abnormal noise.

3. The abnormal noise caused by the lubrication problem

The rotation support of the excavator needs to be lubricated with lubrication, so the abnormal noise may also be caused by the problem of lubrication. The more common reasons are problems such as lack of grease, uneven lubricating fat, poor lubricating fat quality and aging and lubricant selection errors. Therefore, as long as we use the right lubricant, add and replace the new lubricant in time, we can avoid such abnormal sounds.

4. The abnormal noise caused by the damage of the seal bar

The structure of the turnaround support sealing strip plays a key effect on the sealing nature. Therefore, it is necessary to regularly check whether there is wear around the sealing strip, because when the sealing strip and the rotary support are not closely fitted, it will cause lubricating fat to lubricate fat Leaks a certificate outward, and there will be abnormal noise. In addition, the aging and butter resistance of the sealing bar is also a problem that we need to consider.

5, cracks, indentation or rust of abnormal noise

The rolling surface of the rotation support, if cracks, indentation or rust appear, will cause vibration of the rotary support, which will cause noise. However, this noise will cause uncertain changes with the difference in installation and grease. Therefore, we must not tap bearing or use the grease with high viscosity during installation.

6. Severe wear of rolling roads and rolling bodies

The reasons for abnormal noise of the excavator’s rotation support may also be due to the long -term use of the rotation support. The rolling road and the rolling body have reached the life of the use. Repair.

The above content is integrated by the editor. There is an abnormal reasons for the rejuvenation of the excavator and the relevant information of the solution. In addition to these, it is more important to pay attention to the daily use. Maintenance and maintenance. This is the end of today’s sharing. If you still have questions, please consult us at any time!

Which is good for domestic high -quality anticorrosive anti -rust, anti -rust, corrosion, rotation bearing?

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Recently, Luoyang Hengguan Bearing Technology Co., Ltd. (hereinafter referred to as Hengguan Bearing), the anti -corrosion -proof rotation support for the production of production has been smoothly offline, and passed the finished product acceptance to the customer’s hands. The rotary support bearing requires high requirements and belongs to high precision -grade bearing. The constant crown bearing is strictly produced in accordance with the customer’s confirmation drawings, and the quality and quantity are shipped on schedule.

This product is a high-precision grade, accuracy level P5, and requires: 1. Tooth accuracy 6 national standard; 2. Entering tooth surface, 3. High-frequency quenching of the tooth surface, hardness HRC45-55, 4. Anti-corrosion prevention and prevention prevention surface Correction treatment. 5. The finished product clearance is 0-0.06; the end-faced jump is within 0.05, 6. This product belongs to a single-row four-point ball tooth-type reckless support structure with an outer diameter of 1100mm, the inner and outer circle is 40, very thin and easy to deform, processing processing, processing processing, processing processing, processing processing, processing processing, processing process Not easy.

In response to the above requirements, the constant crown bearing began to control from the source, and the quality of the finished product was fully reached. The constant coronary bearing uses 42CRMO to adjust the material to ensure that the hardness of the raw material is within the range of HB229-269, and the performance of the product material is stable and reliable from the source. In the process of conventional production technology, technicians, in response to the high accuracy of the product, high accuracy, very thin and easy to deform, and other characteristics, innovative improvements on conventional production processes are made. Entry, orderly, innovative technology, scientific production, and finished product quality are also expected: complete standards.
And for the special operating conditions and environmental requirements of the customer’s anticorrosive corrosion and corrosion, the anti -corrosion hair black treatment of the rotary support support (so -called hacking is a commonly used method for chemical surface treatment. The principle is to cause a metal surface to produce a layer of oxide film, in order Isolation of the air to achieve the purpose of rust -proof. When the appearance requirements are not high, you can use black treatment. The surface of the steel parts is black, which is also known as the blue). The commonly used anti -corrosion -proof methods include painting, rust -proof wax, galvanized nickel plating, sandblasting, etc. These methods have been done, and the appropriate appearance treatment methods are selected for different working conditions.

There is always no better, only more appropriate, the constant crown bearing, guided by customer needs, and conducting flexible customized production to innovate and improve the real needs of customers. The constant crown bearing, the future of intelligence, and only work hard for the high -quality rotation support!

Five common methods of how to deal with slewing bearing damage

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Slewing bearing, also known as slewing bearing, is a new type of mechanical part composed of inner and outer rings and rolling elements. In various construction machinery such as automobiles, cranes, excavators, etc., slewing bearing is to transmit the axial working load of a turntable and chassis , radial horizontal load and overturning torque key element, it can withstand various loads, and can withstand a large axial, radial, overturning moment, has been well used in the industry, but there will also be some question. Today, the editor will share with you how to deal with the damage of the slewing bearing?​

Slewing ring
How to deal with slewing bearing damage
1. Inflexible rotation
If the rotation is inflexible, you can check the production time of the slewing bearing first. If the time is longer (such as more than half a year) or the weather is cold, the viscosity of the grease in the raceway of the slewing bearing is likely to increase, resulting in If the work is not working, you need to increase the power, and then restart it. If it still does not work, you must consult the after-sales service in time.

2, does not work after installation
If it does not work normally after installation, there is a high probability that the matching of the host mounting surface and the rotating support surface is not in place, and the mounting surface of the host needs to be processed to meet the requirements, or the gasket filling method can be used, and the size can also be adjusted as needed. The meshing position of the gear, in particular, pay attention to the beating of the gear, and confirm whether there is any debris in the meshing part of the large gear. If there is a problem that cannot be solved, you can replace a rotating bearing with a larger clearance.

3. Does not work during use
If it does not work normally during use, add grease in an appropriate amount, inject lubricating oil according to regulations, and check whether any impurities enter the raceway, and also check the meshing condition of the large and small gears to see if there are any impurities or Broken tooth.

4. Abnormal sound
If there is abnormal sound, you should first check whether the installation surface is flat, or stop the rotation of the slewing bearing first, and then confirm whether there is grease in the raceway. This noise can be eliminated after refueling in time. In addition, pay attention to whether the sealing ring is damaged, whether it is the elastic deformation of the slewing bearing caused by the loosening of the installation bolts, or whether there is a negative gap in the deformed part, etc., you can check whether the above conditions are the first.

5. Swing occurs
If rocking occurs, the mounting bolts of the inner and outer rings should be checked immediately and tightened as specified. Or increase the strength of the steel frame of the support, check whether there is overload work, and operate in strict accordance with the regulations.

The above is about how to deal with the damage of the slewing bearing. In fact, the common problems are inflexible operation, abnormal noise, shaking and breaking. When there is a problem, don’t panic, and carefully find the problem. Once solved, you can continue to use it. Today’s editor’s sharing is here. If you have any questions about the slewing bearing, you can leave a message or call for consultation. Your consultation and message are welcome!

Which company ball pelletizer slewing bearing is doing well?

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Recently, Luoyang Hengguan Bearing Technology Co., Ltd. (hereinafter referred to as Hengguan Bearing), designed and manufactured for a large group company in Northeast China, the special slewing bearing for the 6-meter disc ball machine (ball-forming disc) has been successfully completed and passed the finished product. It has been sent to a third-party construction site for installation and trial operation.

The disc pelletizer refers to the equipment used to manufacture green pellets in the pellet production process. Disc pelletizers are widely used in non-ferrous metallurgy, cement, steel, fertilizer and other industrial fields. In the process of application, the design of disc pelletizers has been continuously innovated and perfected, so that the disc pelletizers have reliable functions. , High-quality equipment with rigorous structure, excellent effect, less wear, low energy consumption and easy maintenance. The new disc pelletizing machine is mainly composed of disc body, transmission system, slewing bearing, rotary scraper device, disc body inclination adjustment device, lubrication system and other parts. This time, Hengguan Bearing mainly manufactures one component of the slewing ring bearing. Hengguan Bearing has produced 6-meter and 7.5-meter ball machine slewing ring bearings.
The 6-meter ball machine slewing ring bearing is designated by the owner of our company’s slewing ring bearing, and the ball machine manufacturer is entrusted to purchase it. Since the owner’s on-site ball machine has been shut down due to a problem with the slewing ring, a new set of slewing ring bearings is urgently needed for replacement, so as to resume normal operation as soon as possible. After receiving the order, our company immediately arranged the time to put materials into production; and made innovations and improvements according to the actual use of the old slewing ring bearings on site. Shipped smoothly within 25 days of the order taking effect.

For the on-site problem (1): the slewing bearing is prone to jam and standstill during the operation; this phenomenon occurs because the ball machine is not running horizontally when it is in working state, but during the operation. It is caused by a certain angle of inclination; in the normal slewing bearing raceway, it is composed of rolling elements and spacer blocks; when all rolling elements are tilted and transported, due to the action of gravity, it will cause extrusion, jamming, standstill, etc. Happening. Hengguan Bearing has innovatively improved the slewing bearing cage, so that each rolling element can keep rotating in place, so that this problem can be easily solved.
For the on-site problem (2): the oil leakage of the raceway is serious when the slewing bearing is running; due to the inclined operation of the slewing bearing of the ball machine, the ordinary rubber sealing strip is not tightly sealed, and the raceway leaks under the action of gravity. The oil phenomenon is serious, which is not good for bearing lubrication. In response to this phenomenon, the engineers of Hengguan Bearing proposed to use a double-layer special seal, the internal use of the secret palace type wool seal, and the outer ring to be sealed with a steel plate by direct pressure; the on-site oil leakage phenomenon was properly solved.
There are always more solutions than difficulties. Hengguan Bearing, aiming at the actual use of slewing bearing, solves the problem; constantly emancipates the mind, enhances the sense of innovation, the spirit of innovation and the ability of innovation. Achieve innovation in work ideas, innovation in goals and tasks, and innovation in work measures. By innovating the working mechanism, constantly adapting to new situations, studying new situations, summarizing new experiences, exploring new laws, expanding one’s own brain power, and improving work quality and efficiency, Hengguan people strives for each set of slewing ring bearings that leave the factory to allow customers satisfy. Our aim is: to solve problems for customers, to create value, to be a valuable enterprise! Hengguan Bearings, intelligently create the future, only work hard for high-quality slewing ring bearings!

Maintenance and daily maintenance methods of slewing ring bearings

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Slewing bearing is also known as slewing ring bearing. Due to the wide application of slewing bearing and the relatively low cost, proper repair and maintenance are very important to prolong the life of the bearing, and normal maintenance can ensure the normal operation of the bearing. Work, today Hengguan Xiaobian has sorted out the detailed maintenance and daily maintenance methods of slewing ring bearings to share with you, let’s learn together!
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1. Maintenance and daily maintenance methods of slewing ring bearings in use
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1. Before starting the bearing, refill with new grease according to the working conditions.
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2. Grease should be added to the slewing ring bearing regularly. According to the type of bearing and different bearings, the time for adding lubricating oil is as follows:
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a: Ball type: add grease every 100 hours of operation;
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b: Roller type: add grease every 50 hours of operation;
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For example, under high temperature, dusty, high temperature, high temperature and continuous working conditions, the filling time of grease must be shortened and ensured once every 50 hours; in the case of normal operation, it should be applied once every 150 hours , In the case of heavy work, it should be painted every 75 hours. During long periods of downtime, the lubricating oil should be added once, and the raceway should be filled with each refueling until the oil overflows from the seal. When the grease is added, the rotating bearing should be slowly transferred to allow the raceway filled with grease evenly.
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3. During the period of use, the dirt on the surface of the slewing bearing should be cleaned regularly, and attention should be paid to whether the bearing sealing ring is aging, cracked, damaged, or falling off. If any of these situations occur, they should be treated immediately to prevent impurities from entering the raceway. And the loss of grease, and apply grease after replacement, so as to avoid the rolling elements and rollers from being stuck or corroded.
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4. Due to the influence of various factors in practical application, suitable grease can be selected according to the actual situation, such as graphite grease No. 3, graphite grease No. 4, industrial grease, No. 203 grease, high and low temperature bearing grease 7002 No. 2, aluminum-based grease No. 2, etc. Special attention should be paid to the slewing ring bearing after 100 hours of operation, it should be preloaded, and then every 500 times of operation, it must be fully used.
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5. After the accumulative operation of the device for 2000 hours, if one bolt is loose, which is lower than 80% of the specified torque, this bolt should be replaced with two adjacent bolts; if 20% of the bolts are loose and less than 80% of the specified torque, apply New bolt replacement. After 14,000 cumulative operating hours, all bolts are replaced with new ones.
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6. During the operation, pay attention to the operating conditions of the slewing bearing. If noise, impact, or sudden increase in power is found, the operation must be stopped immediately until all faults are eliminated. If necessary, it must be disassembled.
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7. When using the slewing ring bearing, it is strictly forbidden to use water to directly wash the rotating bearing to prevent the water flow from flowing into the raceway and cause rust; prevent hard objects from approaching or entering the meshing area to avoid damage or cause unnecessary trouble.
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8. Customers have a common misunderstanding about the maintenance of slewing bearings. They think that the lubricating oil of the slewing bearing is the same as the lubricating cycle of the big and small arms, and it needs to be pumped every day. But the opposite is true. If the lubrication cycle is too short, it will lead to excessive lubricating oil in the bearing, causing the seal ring to rupture and leak. In the case of leakage, there will also be impurities infiltrated into the bearing, affecting the work of the bearing. Usually the lubrication time of the rotary bearing is 250 hours. In the process of oiling, turn the machine while stirring, and oiling every 15 degrees is enough. According to your work intensity, it can be adjusted appropriately for different usage situations. Lubrication is usually done once a week or so.
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9. When lubricating the rotary motor, it is necessary to know that the lubrication cycle of the rotary motor is 1000 hours. In normal work, the amount of rotary oil should be checked from the oil dipstick. Sometimes abnormal wear occurs. We need to open the window of the large gear to see See if the lubricating oil leaks from the seal ring into the large gear cavity. In addition to the above maintenance measures, we should also frequently check whether the screws of the gear and the sealing ring of the rotary bearing are damaged. Some small gaps outside will be covered by mud. If it is not found in time, it is easy to cause the turntable to break or even cause an accident.
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10. Maintenance points of large turntable bearings: large turntable bearings are composed of large gears, reducers, center sections, etc. Generally, when we open the cover next to the boom base, we can see the lubrication condition inside the big gear and the wear condition of the gear. In the process of mechanical operation, the dustproof ring at the rotating center joint will be worn out. If it rains, the rainwater will penetrate into the cavity of the large ring gear through the leakage of the rotating center joint, causing the hub to accumulate water. This will greatly affect the service life of the slewing bearing. When the excavator is working, the grease in the cavity is diluted by water, and the lubrication effect is not ideal, which will increase the wear of the ring gear. Long-term soaking will cause the iron filings on the ring gear to fall off, resulting in abnormal rotation.
slewing ring bearing
2. Storage and maintenance method of unused slewing ring bearings
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1. When the slewing bearing leaves the factory, grease has been added to the raceway, and the surface of the slewing bearing is coated with anti-rust lubricating oil. The packaging of the slewing bearing can be individually or integrally packaged according to customer requirements.
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2. If it is not installed, the outer surface needs to be lubricated once every six months to prevent rusting. In the south, it is once every three months.
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3. The raceway of the slewing bearing should be lubricated once a year, and the bearing should be rotated during maintenance to ensure the elasticity of rotation. After the repair, it must be restored to the original state of the slewing bearing and wrapped with film.
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4. When placing the bearing, please place it in a non-corrosive medium, dry and flat room, and must not be immersed in water.
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5. When placing the bearing, it should be placed smoothly, not vertically or inclined. When laying flat (except for the entire package), arrange at least 3-5 spacers in the circumferential direction, and the peripheral positions of the upper and lower blocks should be the same. Bearings that have not been used for many years, take special care when starting, especially in rainy areas.

What are the main failure modes of bearings?

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When the bearing is in use, due to its own quality and external conditions, its performance such as rotation accuracy, bearing capacity and anti-friction performance will change. When the performance index of a bearing is lower than the use requirements and affects normal work, This is called bearing damage or failure. The following is a brief introduction to the main failure modes of the bearing’s bearing by Hengguan Xiaobian.
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The main failure modes of bearings
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1. Metal corrosion occurs
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If the bearing lacks lubrication during use, it will be oxidized and rusted by the air. And don’t soak in water. The material of the bearing is stainless steel. When taking the bearing, wash off the sweat on the hand, apply mineral oil before taking it, especially in summer and rainy season, pay special attention to rust prevention.
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2. Excessive load or improper use
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Bearings cannot exceed their own load during use. Just like if the car pulls too heavy goods, it is easy to cause damage to the bearing. Therefore, in general, the bearings of trucks are more easily damaged than cars, and the reason is that many of the parts are overwhelmed.
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3. The bearing clearance is too small
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For example, the front wheels of the car use inclined-push bearings, and the clearance of the bearings needs to be adjusted. If the clearance is too large, it will cause abnormal noise, deflection, or wheel shaking. If the clearance is too small, it will accelerate the wear of the bearing. For old bearings, it is necessary to check whether there are burrs, scratches or cracks on the surface of the ball (column), and whether the radial clearance and axial clearance are qualified; for new bearings, it is necessary to check the bearing type first. is it right or not.
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4. Use inferior bearings
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Some bearings are produced by some small factories whose production process cannot meet the requirements. The accuracy of the shaft or bearing box is not accurate, and the steel of the bearing is directly pressed for production without proper treatment. Therefore, the service life of the produced bearings is not long.
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5. Improper installation operation
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When the bearing is installed, it is necessary to follow the installation steps of the bearing, and it cannot be installed and disassembled with brute force. Whether the bearing is installed correctly is closely related to the service life of the bearing. When the bearing is installed, it is not allowed to press strongly or directly hit the bearing with a hammer. Try not to take it directly by hand. The sweat on the hand will also cause the bearing to rust.
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6. Foreign body intrusion
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When installing or using the bearing, you need to use special tools, and try to avoid things such as cloth or short fibers, so as to prevent fibers from entering the bearing and causing damage. If the installation personnel use the copper rod knock-in method when installing the bearing, the axial force of the bearing may be uneven, which will cause problems such as deformation of the cage, damage to the rolling elements, and enlargement of the clearance. During the knocking process, copper powder may fly into the bearing cage, making the bearing prone to failure.
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The above are the main failure modes of bearings summarized by Hengguan Xiaobian for everyone. I believe that everyone will have a further understanding of the relevant content. We Hengguan Bearing produces various slewing bearings and slewing bearings, and supports non-standard customization. If you have related needs or questions about bearings, please feel free to call for consultation or leave a message. Looking forward to your call.

How to install wind turbine slewing bearing? Briefly describe its installation points and precautions

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In recent years, clean energy represented by wind power has developed rapidly in my country, which has played a positive role in relieving energy pressure and environmental pressure. Wind power generation equipment generally has a long working time and harsh operating environment, so the performance requirements of its own bearing are relatively high; slewing bearing is one of the main components of wind power generation equipment, and it is a large bearing with a special structure that can withstand comprehensive load capacity; So, how to install the wind turbine slewing bearing? What are the points and precautions? Next, the editor of Hengguan will introduce it to you.

RE Series Crossed roller Slewing bearing
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1. Installation points of wind turbine slewing bearing
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1. Do a good job of inspection before installation
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Check the installation surface of the host, pay attention to the strength of the supporting surface, the connection surface should be machined, and the surface should be flat. If the required flatness cannot be achieved by machining, it can be filled with materials with greater strength, such as special plastics, according to relevant standards.
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2. Pay attention to the load of the quenched soft zone of the bearing ring
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The “S” mark on the end face of the ferrule is the quenched soft belt area of ​​the wind turbine slewing bearing. When installing, pay attention to the position of the soft belt in the non-load area or the non-regular load area (the plug hole is always located at the soft belt).
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3. Radial positioning and preload
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The wind turbine slewing bearing should be radially positioned during installation, cross-tighten the installation bolts, and check the rotation; when tightening the bolts, ensure sufficient pre-tightening force, generally 70% of the upper yield limit of the bolt material; spring washers should not be used for installation bolts. Quenched and tempered flat washers should be used.
Slewing bearing
2. Precautions for the installation of wind turbine slewing bearings
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1. The smoothness and precision of the bearing mounting surface should comply with relevant regulations.
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2. After the slewing bearing is unpacked, each joint surface should be cleaned to remove metal chips, paint, rust inhibitor, etc.
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3. Clean the mating part of the installation plane, and pay attention to check whether the seal is still in the correct position.
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4. In order to avoid the deformation of the inner and outer rings of the bearing, it is strictly forbidden to weld the slewing bearing, otherwise it may be unusable.
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5. The installation plane should be considered to have convex and concave shoulders or positioning blocks for radial positioning.
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6. A little grease should be applied to the raceways and gears to make the installation easier; after installation, the seals must be compacted and flat to avoid grease leakage and grease leakage.
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How to install the wind turbine slewing bearing? The above is the editor’s specific explanation for its installation points and precautions, I hope it will be helpful to your construction work. In order for the bearing to work with high energy efficiency for a long time, it is necessary to achieve accurate matching, up-to-standard installation, and timely maintenance. If you have any other questions or needs, please feel free to leave a message or contact us by phone!

Reasons and treatment methods for oil leakage of slewing bearing

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Slewing bearings are used in many large-scale mechanical equipment. With the continuous increase of operating time, some faults will inevitably occur in the bearing. For example, the leakage of lubricating oil is one of the common problems. Many friends reported that after the oil leakage of the slewing bearing, the grease remaining on the bearing surface will adhere to a lot of dirt, which is easy to cause corrosion to the bearing, which makes them very distressed and do not know how to deal with it. In order to solve everyone’s confusion, Hengguan Xiaobian will take you through this article to take you to understand the causes and treatment methods of oil leakage of slewing bearings.
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1. Reasons for oil leakage of slewing bearing
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1. Frequent filling of lubricating grease or thinning of grease
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The more lubricating oil is filled, the better. The oil filling period of the slewing bearing is generally between 150 and 250 hours. The specific adjustment can be made according to the operating conditions. However, if the filling is too frequent, it will cause grease leakage; The hydraulic oil or gear oil escapes into the cavity of the rotating ring gear, which will dilute the lubricating oil and cause oil leakage.
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2. Incorrect selection of grease
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Bearings and transmissions have suitable grease types. If unsuitable lubricating oil is added, the grease may become thin due to high temperature during operation, and the thin grease will be affected by the driving gear of the rotary motor. Push down to the upper section of the inner gear ring, and then flow into the bearing cavity through the inner oil seal, and leak from the outer oil seal.
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3. Defective or loose outer oil seal
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If the rotary oil seal is defective, it will cause partial or partial leakage of grease; in addition, the loose oil seal will also cause oil leakage, which can be observed when the equipment is running. If the oil seal and the equipment rotate at the same time, it means that the existing oil seal is in the sealing groove. It has been loose and needs to be replaced in time (be sure to pay attention to safety during inspection).
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4. The inner oil seal is damaged or the bearing clearance becomes larger
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The damage of the inner oil seal is one of the reasons for the oil leakage of the slewing bearing. You can open the lubricating grease inspection cover of the slewing ring gear to see if there are broken pieces of the oil seal; in addition, if the bearing clearance becomes larger, the grease will be easily squeezed out during operation. In this case, it is usually accompanied by abnormal noise or shaking of the rotating equipment.
Slewing ring
2. Treatment method for oil leakage of slewing bearing
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1. If the seal is aged or damaged, it is necessary to disassemble the old part and clean the sealing groove, and then insert the new seal into the sealing groove completely.
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2. If the leakage of the rotary motor causes the dilution or deterioration of the lubricating oil, the rotary motor must be repaired and the grease of the entire rotary gear ring must be replaced.
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3. In case of leakage caused by improper selection of grease, all the grease in the rotary gear ring should be replaced, and the same grease should also be used in the bearing cavity.
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4. According to the operating conditions of the equipment, reasonably control the oil filling cycle to avoid excessive filling.
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5. If the slewing bearing is damaged and cannot be repaired, it must be replaced with a new slewing bearing.

Excavator slewing bearing replacement method and precautions

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Slewing bearings are widely used in many large construction machinery and equipment, such as our common excavators are one of them. Due to the large workload and complex working environment of the excavator, bearing damage will inevitably occur after long-term operation. The damage of the slewing bearing is generally manifested as abnormal noise, enlarged gap, oil leakage at the sealing device, etc. If the bearing is indeed damaged after investigation, it needs to be replaced in time. Next, the editor of Hengguan will introduce the replacement method and precautions of the excavator slewing bearing.
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1. Replacement method of excavator slewing bearing
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1. Disassembly method of old slewing bearing
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Connect the outer and inner races of the slewing bearing with the boarding and alighting, respectively, remove all the oil pipes on the slewing motor, and seal the head of the oil pipes with a clean plastic bag. Lift the upper vehicle with a crane, loosen and remove the outer ring bolts of the slewing bearing, and separate the upper vehicle from the lower vehicle.
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2. Assembly method of slewing bearing
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Clean the inner and outer races (including raceways), spacer sleeves, steel balls and bolt holes of the slewing bearing, and place the outer race on the inner race so that the raceways of the inner and outer races are on the same plane Put the steel ball and the spacer sleeve into the raceway through the radial hole, plug the block and install the taper pin firmly; when assembling the sealing device, pay attention to apply sealant to the part in contact with the sealing groove, and rotate The slewing bearing ensures flexible operation; add butter to make the raceway full of butter, and the oil pool of the slewing pinion and the large ring gear of the slewing bearing also needs to be filled with butter.
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3. Slewing bearing installation method
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Lift the upper car of the excavator with a crane. After the lower end of the slewing platform is aligned with the outer race of the slewing bearing, use tools such as round steel to align the upper and lower cars; assemble the bolts, and the bolts are installed in a triangular symmetrical manner , apply anti-loosening glue on the threads; at the beginning, the bolts cannot be tightened. After all the bolts are installed, use the torque wrench to tighten the bolts one by one; after the installation is completed, start the machine and make it rotate and other actions to check whether there is any abnormality.

Slewing ring
2. Precautions for replacement of excavator slewing bearing
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1. Choose a suitable site: When replacing the slewing bearing, choose a site with a large space and a flat ground to facilitate the separation and hoisting of the upper and lower parts.
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2. Careful hoisting: Whether it is to remove or install the bearing, the wire rope for hoisting needs to be hung well to ensure safe hoisting operation.
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3. Tighten the screws and lubricate them in place: when the slewing bearing is replaced, the screws should also be replaced to prevent dark damage, and the replaced screws should be tightened; apply enough lubricating oil to reduce the internal friction of the bearing.
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The above is the replacement method and precautions of the excavator slewing bearing summarized by the editor. I hope it will help you. During the daily maintenance and maintenance of the excavator, the operation of the slewing bearing should be checked, and the abnormality should be dealt with in time. This extends bearing life and saves your operating costs. If you have other questions or needs, feel free to leave a message or contact us by phone!

How to disassemble the large slewing bearing? Four ways to teach you

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Slewing bearing is a kind of large bearing with special structure. It can bear large axial load, radial load and overturning moment and other comprehensive loads at the same time. It is widely used in various industries or equipment. Many friends are not very familiar with how to disassemble large slewing bearings. Next, the editor of Hengguan will introduce the four commonly used bearing disassembly methods for you.


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1. Knock Disassembly Method
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The knocking method is used in many disassembly scenarios. In simple terms, a copper rod or other soft metal material smaller than the inner diameter of the bearing is used to press against the shaft end (if the bearing is located at the end of the shaft), and a hand hammer is used to strike the inside of the bearing evenly and forcefully. The ring slowly dislodges the bearing. This method is simple and easy to implement, but the disadvantage is that it is easy to cause damage to the bearing, so be careful when operating, and pay attention that the impact point of the knock should not fall on the rolling body and cage of the bearing.
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2. Pull out disassembly method
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This method requires the help of a special puller, and the tool can be pulled evenly by rotating the handle to pull out the bearing. This method has better protection for the bearing, and the following points need to be paid attention to during operation:
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1. The hook of the puller should be hooked to the inner ring of the bearing. If it is hooked on the outer ring by mistake, it may cause excessive loosening or damage to the bearing.
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2. To align the screw rod with the center hole of the shaft, pay close attention to the force of the bearing during the pull-out process to avoid damage to the hook and bearing.
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3. Pay attention to prevent the hook from slipping off, and the angle of the two feet of the puller should be less than 90°
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3. Pushing and disassembling method
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This method requires the use of a press to push the bearing, the working process is stable and reliable, and generally does not damage the machine and the bearing. Note that the force point of the press should be on the center of the shaft and cannot be biased. Common presses are manual, mechanical or hydraulic.
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4. Heat treatment disassembly method
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The bearings used for disassembly of the tight fit can be heat-treated first, and then pulled out with the help of a puller. Generally, the oil heated to about 100 ℃ is poured on the bearing to be disassembled. After the bearing ring is heated and expanded, the bearing is pulled out evenly with the help of a special puller. When disassembling this method, self-protection and oil recovery should be done to prevent burns; the shaft body should be wrapped before heating to prevent the bearing from being disassembled due to thermal expansion of the shaft body.
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The above is the specific introduction of how to disassemble the large slewing bearing, I hope it can help you. Luoyang Hengguan Bearing Technology Co., Ltd. is a comprehensive entity enterprise integrating design, research and development, production, sales and service. The product quality is guaranteed. If you have other questions about bearings, you can give us We leave a message or call us, we will serve you wholeheartedly!
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