SWBTEC
Tower Crane Slewing Ring Get Your Best Quote
Made of high-purity 42CrMo forged steel, combined with deep induction hardening process, to ensure that the tower crane slewing bearing in frequent start and stop and high load conditions of the raceway wear resistance and tooth breaking resistance. Slewbearingtec is a source factory with full-process manufacturing capabilities, eliminating trade differentials, supporting single-piece customization and mass production, and providing you with competitive direct selling prices and traceable quality assurance.
Our products
Tower Crane Slewing Ring Characteristics
Optimized heat treatment process of raceway
Using medium frequency induction heating quenching technology, the raceway hardness is strictly controlled between 55-62 HRC, and the depth of the hardened layer is more than 3.5mm. This process effectively prevents the peeling and plastic deformation of the raceway under high stress contact, and the fatigue life is extended by more than 40% compared with ordinary surface quenching products.
High impact gear design
In view of the huge inertial impact of the tower crane rotation, we carry out the gear tooth surface quenching or quenching and tempering treatment. By optimizing the root fillet radius and tooth shape correction, the tooth surface stress concentration is eliminated, and the risk of tooth breakage can be reduced to less than 0.1% even under the maximum wind load and emergency stop conditions.
Precision Grinding Reduces Gap Wear
All tower crane slewing bearings are precision ground before leaving the factory to control the axial and radial clearance within half of the industry standard tolerance. The high-precision coordination significantly reduces the swing amplitude of the tower arm, improves the positioning accuracy of the lifting operation, and reduces the damage of the impact load to the internal ball.
Reinforced sealing system
Considering that the tower crane works in the open air, dusty and high humidity environment all the year round, we are equipped with anti-aging double lip sealing strip. The design can effectively prevent rainwater and construction dust from invading the raceway, prevent the loss of grease, extend the maintenance cycle from once a week to once every two weeks, and greatly reduce maintenance costs.
Strict inspection of raw materials
Each forging blank passes 100% ultrasonic flaw detection before processing to ensure that there are no defects such as cracks, pores or slag inclusions in the material. From the source, the catastrophic structural failure caused by material fatigue is eliminated, and the structural safety of the tower crane in the whole life cycle is guaranteed.
Comprehensive anti-corrosion coating
The outer surface adopts the double protection system of epoxy zinc rich primer and polyurethane topcoat, and the thickness of the paint film exceeds 120 microns. After 480 hours of salt spray testing, the coating can effectively resist acid rain and marine atmospheric corrosion, ensuring the long-term durability of the product in coastal or industrial pollution areas.
Tower Crane Slewing Ring Detailed Specifications
| Parameter categories | Technical Specifications Details | Remark |
| Product Structure | Single-row four-point contact ball type / Double-row ball type / Three-row roller type | Select according to load tonnage |
| raceway diameter | 1000mm – 2800mm (Common range) | Large sizes available |
| Material grade | 42CrMo4 (EN 19) / 50Mn | Forging, normalizing, and tempering |
| tensile strength | ≥ 980 MPa | Core mechanical properties |
| Yield strength | ≥ 850 MPa | Core mechanical properties |
| Impact power | ≥ 27 J (-20°C) | Low-temperature toughness protection |
| Gear module | 10mm – 24mm | Larger modules have stronger load-bearing capacity |
| Bolt hole tolerance | H9 / H10 | Ensure installation accuracy |
| Lubrication method | Centralized lubrication interface / Manual grease nipple | Reserved standard interface |
| Temperature adaptation | -40°C to +60°C | Special oils are needed in extreme environments |
| Follow the standards | JG/T 66-1999, JB/T 10471 | Meets construction machinery standards |
Tower Crane Slewing Ring Comparison Point
Compared with similar products using ordinary cast steel or simplified heat treatment process on the market, Slewbearingtec products have significant advantages in material purity and processing accuracy. The Slewbearingtec integral forging process ensures the integrity of the metal fiber flow lines, making the load-bearing capacity 30% higher than that of the cast ring body. At the same time, the negative clearance pretightening technology adopted by the Slewbearingtec effectively solves the shaking problem caused by the loose bearing of the tower crane in the early stage of use, and improves the control confidence of the operator.
Solving the problem of gear fracture under high-frequency operation
Solve internal rust sticking caused by bad weather
Solve the problem of excessive shaking after long-term use
Tower Crane Slewing Ring applicable crowd
Construction crane leasing company
For leasing companies with a large number of tower cranes, asset preservation and low failure rate of equipment are the core demands. The high durability of this product reduces the frequency of replacement, can adapt to the complex working conditions of different construction sites, and reduces the maintenance cost of the whole life cycle. It is an ideal choice for the renewal of parts for the rental fleet.
Tower crane maintenance and remanufacturing service provider
Professional service providers need replacement parts that are accurate in size and easy to install. Our tower crane slewing bearing strictly follows OEM size standards, precise tolerance control, and can be directly installed without on-site secondary processing, helping service providers to shorten maintenance downtime and improve customer satisfaction.
Port and Terminal Operating Unit
The port portal crane has high working intensity and high requirements for corrosion resistance and continuous operation ability. For such users, we provide support products with enhanced anti-corrosion coating and heavy-duty design to ensure long-term stable rotation performance in salt spray environment and reduce logistics delays caused by downtime and maintenance.
large steel structure construction enterprise
In the lifting of high-rise steel structure, the accuracy of the position is very high. The low clearance design of this product significantly improves the positioning stability of the hook, helps the construction enterprise to be more handy in the docking of precision components, and improves the construction efficiency and safety.
Tower Crane Slewing Ring instructions for use
Stepwise Application of Bolt Preload
During installation, it is strictly forbidden to tighten the bolts in place at one time. A torque wrench shall be used to gradually tighten the high-strength bolts in three times (30%, 80% and 100 torque) according to the diagonal principle to ensure that the bearing ring is evenly stressed and to prevent raceway deformation caused by installation stress.
Regular grease replenishment schedule
It is recommended to add lithium grease to the raceway every 100 hours of work, and clean and oil the tooth surface every 300 hours of work. Slowly rotate the slewing bearing during oil filling until new grease overflows from the sealing band to ensure that the old grease and impurities are completely discharged.
Inspection of gear meshing clearance
After installation and after 100 hours of initial use, the meshing clearance between the pinion and the slewing ring gear must be checked. If the gap is too small, it will cause noise and abnormal wear, and if the gap is too large, it will cause impact. Be sure to adjust the position of the pinion to maintain the meshing backlash at each point in accordance with the technical requirements.
Abnormal noise and operation condition monitoring
The operator should pay attention to the sound of the rotation every day. If there is a regular “click” sound or metal grinding sound, stop the machine immediately for inspection. This is usually a precursor to raceway spalling or bolt loosening, and timely investigation can avoid serious overturning accidents.
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FAQ And Contact Us
Welcome to our Frequently Asked Questions page. We have compiled answers to common questions you may have, hoping to provide you with clear and quick solutions. If you cannot find the information you need here, please feel free to contact our customer support team.
Please feel free to contact us. We look forward to hearing from you.
Tower Crane Slewing Ring
Made of high-purity 42CrMo forged steel, combined with deep induction hardening process, to ensure that the tower crane slewing bearing in frequent start and stop and high load conditions of the raceway wear resistance and tooth breaking resistance. Slewbearingtec is a source factory with full-process manufacturing capabilities, eliminating trade differentials, supporting single-piece customization and mass production, and providing you with competitive direct selling prices and traceable quality assurance.
42CrMo / 50Mn forged steel
Inner and outer ring material
55-62 HRC
Raceway quenching hardness
3.5mm.
Effective hardening layer depth
Tower Crane Slewing Ring Characteristics
Optimized heat treatment process of raceway
Using medium frequency induction heating quenching technology, the raceway hardness is strictly controlled between 55-62 HRC, and the depth of the hardened layer is more than 3.5mm. This process effectively prevents the peeling and plastic deformation of the raceway under high stress contact, and the fatigue life is extended by more than 40% compared with ordinary surface quenching products.
High impact gear design
In view of the huge inertial impact of the tower crane rotation, we carry out the gear tooth surface quenching or quenching and tempering treatment. By optimizing the root fillet radius and tooth shape correction, the tooth surface stress concentration is eliminated, and the risk of tooth breakage can be reduced to less than 0.1% even under the maximum wind load and emergency stop conditions.
Precision Grinding Reduces Gap Wear
All tower crane slewing bearings are precision ground before leaving the factory to control the axial and radial clearance within half of the industry standard tolerance. The high-precision coordination significantly reduces the swing amplitude of the tower arm, improves the positioning accuracy of the lifting operation, and reduces the damage of the impact load to the internal ball.
Reinforced sealing system
Considering that the tower crane works in the open air, dusty and high humidity environment all the year round, we are equipped with anti-aging double lip sealing strip. The design can effectively prevent rainwater and construction dust from invading the raceway, prevent the loss of grease, extend the maintenance cycle from once a week to once every two weeks, and greatly reduce maintenance costs.
Strict inspection of raw materials
Each forging blank passes 100% ultrasonic flaw detection before processing to ensure that there are no defects such as cracks, pores or slag inclusions in the material. From the source, the catastrophic structural failure caused by material fatigue is eliminated, and the structural safety of the tower crane in the whole life cycle is guaranteed.
Comprehensive anti-corrosion coating
The outer surface adopts the double protection system of epoxy zinc rich primer and polyurethane topcoat, and the thickness of the paint film exceeds 120 microns. After 480 hours of salt spray testing, the coating can effectively resist acid rain and marine atmospheric corrosion, ensuring the long-term durability of the product in coastal or industrial pollution areas.
Tower Crane Slewing Ring Detailed Specifications
| Parameter categories | Technical Specifications Details | Remark |
| Product Structure | Single-row four-point contact ball type / Double-row ball type / Three-row roller type | Select according to load tonnage |
| raceway diameter | 1000mm – 2800mm (Common range) | Large sizes available |
| Material grade | 42CrMo4 (EN 19) / 50Mn | Forging, normalizing, and tempering |
| tensile strength | ≥ 980 MPa | Core mechanical properties |
| Yield strength | ≥ 850 MPa | Core mechanical properties |
| Impact power | ≥ 27 J (-20°C) | Low-temperature toughness protection |
| Gear module | 10mm – 24mm | Larger modules have stronger load-bearing capacity |
| Bolt hole tolerance | H9 / H10 | Ensure installation accuracy |
| Lubrication method | Centralized lubrication interface / Manual grease nipple | Reserved standard interface |
| Temperature adaptation | -40°C to +60°C | Special oils are needed in extreme environments |
| Follow the standards | JG/T 66-1999, JB/T 10471 | Meets construction machinery standards |
Tower Crane Slewing Ring Comparison Point
Solving the problem of gear fracture under high-frequency operation
Ordinary slewing bearing in the tower crane frequently start braking, tooth root easily due to fatigue fracture. The Slewbearingtec improves the bending fatigue strength of the tooth root by shot peening and adopts the design of the variable gear, completely solves the hidden danger of tooth collapse under heavy load conditions, and ensures the safety of construction.Solve internal rust sticking caused by bad weather
In view of the problem that the tower crane support in coastal and rainy areas is prone to water corrosion, we have optimized the sealing groove structure and used special rubber sealing strips with strong weather resistance. This 1 improvement solves the pain points of ball corrosion and grease deterioration caused by water infiltration, and ensures that the mechanism can run smoothly in wet seasons.Solve the problem of excessive shaking after long-term use
After 1 years of use of traditional products, the gap is often too large due to raceway wear, resulting in severe swing at the end of the tower arm. The Slewbearingtec uses a high-depth induction hardening layer to ensure that the wear rate is extremely low, and solves the pain point that the tower crane cannot pass the annual inspection or needs frequent adjustment and maintenance due to the increase of the gap.Tower Crane Slewing Ring applicable crowd
Construction crane leasing company
For leasing companies with a large number of tower cranes, asset preservation and low failure rate of equipment are the core demands. The high durability of this product reduces the frequency of replacement, can adapt to the complex working conditions of different construction sites, and reduces the maintenance cost of the whole life cycle. It is an ideal choice for the renewal of parts for the rental fleet.
Tower crane maintenance and remanufacturing service provider
Professional service providers need replacement parts that are accurate in size and easy to install. Our tower crane slewing bearing strictly follows OEM size standards, precise tolerance control, and can be directly installed without on-site secondary processing, helping service providers to shorten maintenance downtime and improve customer satisfaction.
Port and Terminal Operating Unit
The port portal crane has high working intensity and high requirements for corrosion resistance and continuous operation ability. For such users, we provide support products with enhanced anti-corrosion coating and heavy-duty design to ensure long-term stable rotation performance in salt spray environment and reduce logistics delays caused by downtime and maintenance.
large steel structure construction enterprise
In the lifting of high-rise steel structure, the accuracy of the position is very high. The low clearance design of this product significantly improves the positioning stability of the hook, helps the construction enterprise to be more handy in the docking of precision components, and improves the construction efficiency and safety.
Tower Crane Slewing Ring instructions for use
Stepwise Application of Bolt Preload
During installation, it is strictly forbidden to tighten the bolts in place at one time. A torque wrench shall be used to gradually tighten the high-strength bolts in three times (30%, 80% and 100 torque) according to the diagonal principle to ensure that the bearing ring is evenly stressed and to prevent raceway deformation caused by installation stress.
Regular grease replenishment schedule
It is recommended to add lithium grease to the raceway every 100 hours of work, and clean and oil the tooth surface every 300 hours of work. Slowly rotate the slewing bearing during oil filling until new grease overflows from the sealing band to ensure that the old grease and impurities are completely discharged.
Inspection of gear meshing clearance
After installation and after 100 hours of initial use, the meshing clearance between the pinion and the slewing ring gear must be checked. If the gap is too small, it will cause noise and abnormal wear, and if the gap is too large, it will cause impact. Be sure to adjust the position of the pinion to maintain the meshing backlash at each point in accordance with the technical requirements.
Abnormal noise and operation condition monitoring
The operator should pay attention to the sound of the rotation every day. If there is a regular “click” sound or metal grinding sound, stop the machine immediately for inspection. This is usually a precursor to raceway spalling or bolt loosening, and timely investigation can avoid serious overturning accidents.
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