Excavator Slewing Ring Bearing Premium Quality Guaranteed

The 42CrMo alloy steel is integrally forged, the core hardness reaches 240-280HB after quenching and tempering treatment, and the raceway hardness reaches 55-62HRC combined with induction quenching technology. Designed for high-load excavators, it can withstand great axial force and tilting moment, ensuring stable operation for more than 25000 hours under harsh conditions, and supporting bulk purchases.

42CrMo

Body material

60HRC

Raceway hardness

7 levels

Gear accuracy

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excavator slewing ring bearing characteristics

Alloy steel forging matrix to enhance tensile strength

42CrMo alloy steel treated by vacuum degassing is selected to eliminate internal pores and cracks through integral forging. Compared with ordinary 50Mn steel, the tensile strength is increased by 35%, and the low temperature impact toughness is enhanced, which effectively prevents brittle fracture in the cold mine operation environment.

Deep induction hardening raceway technology to extend fatigue life

The raceway adopts a CNC induction hardening process, and the depth of the hardened layer is precisely controlled between 3.5mm and 5mm. This deep hardening treatment ensures that the surface of the raceway does not peel off or collapse when subjected to alternating loads for a long time, and the fatigue life is 1.5 times that of the surface quenching product.

High-precision gear grinding technology to reduce wear

Gear processing adopts precision grinding process, the tooth surface roughness is controlled within Ra 3.2, and the gear accuracy reaches ISO 7 standard. The high-precision gear meshing significantly reduces the impact and noise during rotation, reduces the backlash wear of the tooth surface, and extends the life of the pinion shaft by about 20%.

Aging resistant double lip sealing system

Equipped with high-temperature and oil-resistant high-performance nitrile rubber double-lip sealing strip. The sealing structure can effectively prevent coal ash, sand dust and moisture from invading the inside of the raceway, prevent the loss of grease, and improve the sealing performance of the bearing in dust environment by 90%.

Clearance control and detection to eliminate sloshing phenomenon

Before leaving the factory, 100% of the axial and radial clearance is tested, and the clearance tolerance is controlled within the range of 0.03mm to 0.08mm. The precise preload design eliminates the shaking of the slewing device and ensures that the excavator moves smoothly without frustration during fine leveling operations.

Comprehensive NDT

Each set of excavator slewing bearing has been double tested by ultrasonic flaw detection and magnetic particle flaw detection. Ensure that there are no white spots and inclusions inside the forging, and no micro cracks on the tooth surface and raceway surface, so as to eliminate any risk of early failure caused by material defects.

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.

Slewing Bearing Without Gear

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.

Cross Roller Slewing Bearing

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.

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excavator slewing ring bearing Detailed specifications table

Parameter name	Technical Specifications
Product Type	Single-row four-point contact ball type / Double-row unequal diameter ball type
Applicable Model Range	6-ton to 50-ton hydraulic excavators
Ring material	42CrMo / 50Mn (optional, depending on operating conditions)
Scroll body material	GCr15SiMn high carbon chromium bearing steel
Raceway surface hardness	55 – 62 HRC
Tooth surface hardness	50 – 60 HRC (optional tooth surface hardening)
Core tempering hardness	229 – 269 HB
Hardened layer depth	Raceway: ≥ 3mm; Gear: ≥ 1.5mm
Gear precision grade	Level 7–8 (ISO 1328)
Sealing material	Oil-resistant NBR (Nitrile Butadiene Rubber)
Lubrication method	Pre-filled molybdenum disulfide extreme pressure lithium-based grease
Operating temperature range	-40°C to +100°C

excavator slewing ring bearing comparison point

Compared with ordinary casting or low-end forging slewing bearings on the market, this product adopts the whole process of quenching and tempering, not just surface treatment. This means that the core of the product has better strength and toughness, and can resist the severe impact of excavator operation without deformation. In addition, our tooth surface adopts segmented induction hardening, which avoids the soft belt docking problem easily caused by traditional full-circle quenching and ensures the 360-degree hardness of the gear.

Solve the structural failure of broken teeth and broken teeth

The stress concentration of the tooth root was eliminated by optimizing the radius of the tooth root fillet and strengthening the tooth root by shot peening. With the high toughness of 42CrMo material, the problem of tooth breakage caused by excessive instantaneous impact load is completely solved when the excavator is digging hard rock or strong crushing.

Solve the abnormal sound and sticking phenomenon of rotation

In view of the problem of sticking caused by the peeling of the old bearing raceway, we adopted the optimized raceway curvature design and high-precision steel ball selection. This not only reduces the friction heat between the raceway and the steel ball, but also effectively prevents the metal debris generated by fretting wear from jamming the raceway, and solves the problem of unsmooth rotation.

Solve the pollution caused by grease leakage

In view of the oil leakage problem caused by the aging of the sealing strip, the labyrinth groove combined with the double lip seal structure is adopted. This design not only enhances the retention of internal grease, but also solves the problem of emulsification and deterioration of grease due to muddy water entering the raceway through the failed sealing ring.

excavator slewing ring bearing Applicable crowd

Excavator machine manufacturing factory purchasing department

It is suitable for engineering machinery OEMs that need to find OEM supporting standards and have stable batch supply capacity. Our product tolerances and material reports meet the strict access standards of international OEMs and can be directly used in new machine assembly lines.

excavator slewing ring bearing Applicable crowd

Construction machinery after-sales maintenance and renovation service providers

For specialized in excavator overhaul, second-hand equipment refurbishment of maintenance enterprises. The standardized installation size of this product can perfectly replace the original parts, and the price is more competitive, helping the repairer to control the maintenance cost under the premise of ensuring the quality.

Mine and large earthwork contractors

For mine owners who have self-maintenance teams and manage dozens of excavator fleets. The high wear characteristics of the product are designed for continuous high-strength operating environment, can significantly reduce the equipment downtime caused by the replacement of bearings.

International engineering machinery parts trade agent

Suitable for import and export traders looking for cost-effective alternatives. The product packaging meets the export standard of sea transportation, and provides complete neutral packaging or customized marking service, which is convenient for agents to establish their own distribution brand in the local market.

excavator slewing ring bearing Instructions for use

Cleaning and inspection of installation plane

Oil dirt, burrs and old paint on the mounting surface of the bearing must be thoroughly removed before installation. Use a feeler gauge to check the flatness of the installation plane to ensure that the flatness error is within 0.15mm to prevent the bearing from being distorted after installation.

Pre-tightening sequence of high-strength bolts

High-strength bolts of grade 10.9 or 12.9 must be used and coated with thread fastening glue. Fastening should be carried out in accordance with the principle of 180-degree symmetrical direction crossing, and gradually tighten in 3 steps (30%, 80%, 100% torque) to ensure uniform force.

Filling and cycle of grease

After installation, it is necessary to inject extreme pressure lithium grease through the grease nipple during slow rotation until the grease escapes evenly from the sealing lip. Under normal working conditions, it shall be filled once every 100 hours, and the environment with large dust and high humidity shall be shortened to 50 hours.

Secondary fastening after running-in period

After the slewing bearing has been put into service for 100 hours, a torque check must be performed on all mounting bolts. After that, check every 500 hours of work to prevent serious equipment accidents caused by loose bolts caused by vibration.

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

Q1: Which brands of excavator original parts can your slewing bearing replace?

The size and performance of our products are strictly manufactured according to OEM standards, which can perfectly replace the original 6-ton to 50-ton excavator slewing bearings of mainstream brands such as Komatsu, Caterpillar, Hitachi, Volvo, Hyundai, Doosan, Sany, and Xugong.

Q2: What is the difference between 42CrMo material and 50Mn material, how should I choose?

50Mn is mainly used for small and medium-sized excavators or light load conditions, with high cost performance; 42CrMo belongs to alloy structural steel, with better hardenability and impact toughness and higher strength. It is strongly recommended that large excavators or mines with more than 20 tons of crushing work conditions choose 42CrMo material.

Q3: What is the shipping packaging of the product, can it prevent rust by sea?

The surface of the product will be coated with anti-rust oil, wrapped with a layer of plastic film, wrapped with a layer of kraft paper, and finally put into a non-fumigation plywood wooden box for fixation. This four-layer protective packaging is fully in line with international shipping standards and guarantees a rust-proof period of more than 12 months.

Q4: If I am not sure about the part number, how can I confirm that I also bought the right model?

You can provide the 3 key dimensions of the old bearing: the outer diameter, the inner diameter, and the center distance of the mounting hole. It is better to provide the specific model and factory year of the excavator, and our technical team will help you accurately match according to the database.

Q5: What is the difference between gear quenching and non-quenching?

The hardness of the unquenched gear is low, which is suitable for general mining operations; the hardness of the gear can reach more than 50HRC after quenching, and the wear resistance is greatly improved. For often rotating mining or working conditions with great dust in the working environment, we recommend the selection of tooth surface induction hardening products.

Q6: How long do you guarantee the excavator slewing bearing?

For different materials and working conditions, we provide 12 months or 2000 working hours of quality assurance. During the warranty period, if the damage is caused by material defects or manufacturing processes, we promise to replace the new parts free of charge.

Please feel free to contact us. We look forward to hearing from you.

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