SWBTEC
Slew Bearing Crane Direct from Factory
The Slewbearingtec is specially designed for heavy crane slewing mechanism, made of 42CrMo forged alloy steel, raceway by surface induction hardening treatment, the hardness of HRC58 or more. the slew bearing crane can bear extremely high axial force and overturning moment, and cooperate with the high-precision gear meshing design to ensure the smooth rotation of the equipment and significantly extend the maintenance and replacement cycle, so as to undertake the group purchase of enterprises.
42CrMo
Material:
58 degrees
Raceway hardness:
eight
Gear accuracy:
Slew Bearing Crane Characteristics
Enhanced raceway quenching process
Using medium frequency induction hardening technology, the effective hardening layer depth of the raceway is controlled between 3 and 5mm, and the hardness is stable between HRC58 and 62. Compared with shallow quenching products, this deep treatment effectively prevents the surface spalling and plastic deformation of the raceway under high load operation of the crane, and the service life is increased by 40%.
Optimized gear meshing accuracy
Strictly follow ISO 5 or AGMA eight gear accuracy standards, and the tooth surface roughness is controlled within Ra3.2. This high-precision gear machining significantly reduces the impact load of the slew bearing crane during starting and braking, reduces gear wear by 60%, and reduces noise decibels during operation.
high strength monolithic forging material
The high-quality 42CrMo tempered steel is selected, the tensile strength is above 980MPa, and the low-temperature impact energy KV2 is greater than 27J. Compared with the ordinary 50Mn material, the material has a stronger anti-fracture ability in cold environment or overweight load conditions, and eliminates the safety hazard of gear tooth breakage.
Aging resistant sealing system
Equipped with oil and ozone resistant nitrile rubber double lip sealing strip, specially designed for outdoor harsh conditions. The sealing system can effectively prevent sand dust and rain water from invading the inside of the raceway, prevent the loss of grease, and extend the maintenance interval of slew bearing crane in dust environment by twice.
zero clearance preload technology
Precise pre-loading treatment before leaving the factory, strict control of axial and radial clearance. For lifting operations with high precision requirements, this zero-clearance design eliminates the shaking feeling when the boom rotates, ensures the accuracy of hoisting positioning, and greatly improves operational safety.
Universal installation compatibility
Manufactured according to OEM specifications of mainstream crane brands, the deviation of mounting hole position is controlled within 0.2mm. There is no need for on-site secondary processing, and maintenance personnel can directly replace old parts, shortening the equipment downtime maintenance time from an average of 8 hours to less than 4 hours.
Different types of slewing bearings
Single Row Ball Slewing Bearing
Based on the four-point contact ball bearing design, this series offers optimal economy and capacity for given dimensions. It is specifically engineered to serve as an efficient solution when replacing existing multi-bearing arrangements.
Double Row Ball Slewing Bearing
Utilizing an eight-point contact ball bearing structure, this design delivers superior load handling, providing an 80% increase in capacity compared to a same-sized single row four-point contact ball bearings. It is ideal for heavy-duty applications requiring a compact footprint.
Slewing Ring Bearing With External Gear
This bearing incorporates a crossed cylindrical roller bearing design. It is characterized by its high stiffness and constant resistance to rotation, making it the preferred choice for precision equipment requiring high stability and rigidity.
Slewing Bearing With Internal Gear
Features integrated teeth on the outer ring for direct drive transmission. This configuration can be combined with triple row roller bearing internals to provide the highest capacity for a given diameter, making it suitable for heavy machinery where torque transmission and load capacity are critical.
Designed with teeth on the inner ring to save space and protect the drive mechanism. This type allows for compact installation and can be adapted with wire race bearing technology to be 60% lighter compared to same-sized all-steel bearings, offering a lightweight yet durable solution.
A versatile gearless design used where the drive mechanism is independent of the bearing rings. It offers the flexibility to be customized with various internal structures—from four-point contact balls for optimal economy to crossed rollers for high stiffness—depending on the application’s specific motion control requirements.
Slew Bearing Crane Technical Specifications Table
| Parameter Items | Technical indicators | Remark |
| core materials | 42CrMo / 50Mn | Integral forging and tempering treatment |
| Raceway hardness | 55 – 62 HRC | Medium frequency induction hardening |
| Soft band area | Marked with an “S” stamp | Install in a non-load-bearing area. |
| Gear type | External teeth / Internal teeth / Toothless | According to AGMA standards |
| Tooth surface hardness | 50 – 60 HRC | Optional tooth surface quenching |
| Sealing material | Nitrile butadiene rubber (NBR) | Temperature range: -30℃ to 120℃ |
| Lubrication method | Lithium-based grease EP2 | Pre-filled before delivery |
| Tolerance grade | IT7 – IT8 | Suitable for precision rotation |
| Structural form | Single-row four-point contact ball / Double-row ball | Select according to load |
Slew Bearing Crane Comparison Points
Ordinary slew bearing crane often has defects in material purity and heat treatment uniformity, resulting in sticking or abnormal noise after less than one year of use. Through the whole process of ultrasonic flaw detection, the Slewbearingtec ensures that there are no cracks and slag in the interior, and shows extremely high structural stability under the condition of heavy load and frequent start and stop. Compared with the general-purpose parts on the market, the slewbearingtec products are specially optimized for the unbalanced load characteristics of cranes, and the contact stress concentration is reduced.
Solve the trouble of misalignment of mounting holes
Solve the problem of early tooth fracture
Solve the sticking caused by the peeling of the raceway
Slew Bearing Crane Applicable crowd
Mobile crane maintenance service provider
It is suitable for enterprises specializing in the maintenance of truck cranes and all-road cranes. The slew bearing crane’s highly interchangeable design can meet the needs of emergency repairs, help repairers respond quickly to end-customer failures, and reduce the time spent on the site.
Tower Crane Leasing Company
For leasing companies with a large number of tower crane assets. Our high wear-resistant products can adapt to the high frequency of tower crane rotation operation, significantly reduce the loss rate of spare parts during the lease period, and help leasing companies control the maintenance cost of the whole life cycle of assets.
Port Machinery Maintenance Department
Suitable for internal maintenance teams of port portal cranes and floating crane equipment. In view of the high salt spray corrosion environment of the port, our enhanced sealing and anti-rust treatment can effectively resist the erosion of the marine environment and ensure the continuous operation of the port logistics equipment.
Construction machinery used equipment refurbishers
For factories engaged in used crane recycling and remanufacturing. Refurbishment with slewbearingtec high-standard slewing bearings can significantly improve the performance rating and market resale price of second-hand equipment, providing the slewing stability close to the new machine for the refurbished machine.
Instructions for use Slew Bearing Crane
Cleaning of installation reference surface
Before installing the slew bearing crane, the crane mount must be thoroughly cleaned of paint, rust and burrs. Use industrial alcohol to clean the surface and ensure that the installation flatness error does not exceed 0.15mm to prevent deformation of the support due to uneven base.
Positioning of soft belt
Look for the “S” mark on the end face of the inner or outer ring of the bearing, which represents the soft zone of the raceway quenching. During installation, this area must be placed in a non-load area or a non-frequent operation area, usually perpendicular to the maximum load direction of the crane.
Bolt pre-tightening sequence
Do not tighten the bolts in a circular sequence. High-strength bolts must be used and tightened in 3 steps according to a 180-degree symmetrical star sequence to reach 30%, 80% and 100 of the specified torque respectively. Finally, check all bolts to ensure uniform tightening force.
Tooth side clearance adjustment
After the installation is completed, the meshing gap between the gear and the pinion must be checked. Measure at 3 evenly distributed points on the circumference to ensure that the flank clearance is between 0.25 and 0.40mm, and apply an appropriate amount of grease on the tooth surface to test whether the contact spot is centered.
factory and certificate
certificate
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.
FAQ
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Related Products
Slew Bearing Crane Direct from Factory
The Slewbearingtec is specially designed for heavy crane slewing mechanism, made of 42CrMo forged alloy steel, raceway by surface induction hardening treatment, the hardness of HRC58 or more. the slew bearing crane can bear extremely high axial force and overturning moment, and cooperate with the high-precision gear meshing design to ensure the smooth rotation of the equipment and significantly extend the maintenance and replacement cycle, so as to undertake the group purchase of enterprises.
Material:
42CrMo
Raceway hardness:
58 degrees
Gear accuracy:
eight
Slew Bearing Crane Characteristics
Enhanced raceway quenching process
Using medium frequency induction hardening technology, the effective hardening layer depth of the raceway is controlled between 3 and 5mm, and the hardness is stable between HRC58 and 62. Compared with shallow quenching products, this deep treatment effectively prevents the surface spalling and plastic deformation of the raceway under high load operation of the crane, and the service life is increased by 40%.
Optimized gear meshing accuracy
Strictly follow ISO 5 or AGMA eight gear accuracy standards, and the tooth surface roughness is controlled within Ra3.2. This high-precision gear machining significantly reduces the impact load of the slew bearing crane during starting and braking, reduces gear wear by 60%, and reduces noise decibels during operation.
high strength monolithic forging material
The high-quality 42CrMo tempered steel is selected, the tensile strength is above 980MPa, and the low-temperature impact energy KV2 is greater than 27J. Compared with the ordinary 50Mn material, the material has a stronger anti-fracture ability in cold environment or overweight load conditions, and eliminates the safety hazard of gear tooth breakage.
Aging resistant sealing system
Equipped with oil and ozone resistant nitrile rubber double lip sealing strip, specially designed for outdoor harsh conditions. The sealing system can effectively prevent sand dust and rain water from invading the inside of the raceway, prevent the loss of grease, and extend the maintenance interval of slew bearing crane in dust environment by twice.
zero clearance preload technology
Precise pre-loading treatment before leaving the factory, strict control of axial and radial clearance. For lifting operations with high precision requirements, this zero-clearance design eliminates the shaking feeling when the boom rotates, ensures the accuracy of hoisting positioning, and greatly improves operational safety.
Universal installation compatibility
Manufactured according to OEM specifications of mainstream crane brands, the deviation of mounting hole position is controlled within 0.2mm. There is no need for on-site secondary processing, and maintenance personnel can directly replace old parts, shortening the equipment downtime maintenance time from an average of 8 hours to less than 4 hours.
Slew Bearing Crane Technical Specifications Table
| Parameter Items | Technical indicators | Remark |
| core materials | 42CrMo / 50Mn | Integral forging and tempering treatment |
| Raceway hardness | 55 – 62 HRC | Medium frequency induction hardening |
| Soft band area | Marked with an “S” stamp | Install in a non-load-bearing area. |
| Gear type | External teeth / Internal teeth / Toothless | According to AGMA standards |
| Tooth surface hardness | 50 – 60 HRC | Optional tooth surface quenching |
| Sealing material | Nitrile butadiene rubber (NBR) | Temperature range: -30℃ to 120℃ |
| Lubrication method | Lithium-based grease EP2 | Pre-filled before delivery |
| Tolerance grade | IT7 – IT8 | Suitable for precision rotation |
| Structural form | Single-row four-point contact ball / Double-row ball | Select according to load |
Slew Bearing Crane Comparison Points
Solve the problem of early tooth fracture
In view of the impact fracture of the gear caused by the emergency stop of the crane, the slewbearingtec adopts the full fillet transition process of the tooth root and carries on the shot peening strengthening treatment. We have increased the bending fatigue limit of the tooth root by 35%, completely solving the pain point of the tooth root fracture caused by the instantaneous impact load.Solve the sticking caused by the peeling of the raceway
In view of the raceway crushing problem caused by the thin hardened layer of the old bearing, it is slewbearingtec to strictly implement the deep induction hardening standard. We have solved the problem of metal debris from premature peeling of the raceway surface under heavy load conditions, and avoided expensive emergency shutdown maintenance costs.Solve the trouble of misalignment of mounting holes
In view of the problem that it is difficult to install the old parts on the maintenance site, the three-coordinate measuring instrument is slewbearingtec introduced to carry out full inspection on all the installation holes. We have solved the problem of bolt hole position deviation caused by heat treatment deformation, ensuring that on-site maintenance personnel can quickly complete installation without reaming, and greatly improving maintenance efficiency.Slew Bearing Crane Applicable crowd
Mobile crane maintenance service provider
It is suitable for enterprises specializing in the maintenance of truck cranes and all-road cranes. The slew bearing crane’s highly interchangeable design can meet the needs of emergency repairs, help repairers respond quickly to end-customer failures, and reduce the time spent on the site.
Tower Crane Leasing Company
For leasing companies with a large number of tower crane assets. Our high wear-resistant products can adapt to the high frequency of tower crane rotation operation, significantly reduce the loss rate of spare parts during the lease period, and help leasing companies control the maintenance cost of the whole life cycle of assets.
Port Machinery Maintenance Department
Suitable for internal maintenance teams of port portal cranes and floating crane equipment. In view of the high salt spray corrosion environment of the port, our enhanced sealing and anti-rust treatment can effectively resist the erosion of the marine environment and ensure the continuous operation of the port logistics equipment.
Construction machinery used equipment refurbishers
For factories engaged in used crane recycling and remanufacturing. Refurbishment with slewbearingtec high-standard slewing bearings can significantly improve the performance rating and market resale price of second-hand equipment, providing the slewing stability close to the new machine for the refurbished machine.
Instructions for use Slew Bearing Crane
Cleaning of installation reference surface
Before installing the slew bearing crane, the crane mount must be thoroughly cleaned of paint, rust and burrs. Use industrial alcohol to clean the surface and ensure that the installation flatness error does not exceed 0.15mm to prevent deformation of the support due to uneven base.
Positioning of soft belt
Look for the “S” mark on the end face of the inner or outer ring of the bearing, which represents the soft zone of the raceway quenching. During installation, this area must be placed in a non-load area or a non-frequent operation area, usually perpendicular to the maximum load direction of the crane.
Bolt pre-tightening sequence
Do not tighten the bolts in a circular sequence. High-strength bolts must be used and tightened in 3 steps according to a 180-degree symmetrical star sequence to reach 30%, 80% and 100 of the specified torque respectively. Finally, check all bolts to ensure uniform tightening force.
Tooth side clearance adjustment
After the installation is completed, the meshing gap between the gear and the pinion must be checked. Measure at 3 evenly distributed points on the circumference to ensure that the flank clearance is between 0.25 and 0.40mm, and apply an appropriate amount of grease on the tooth surface to test whether the contact spot is centered.
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