Slewing Bearing for Excavator Check Details & Parameters

Made of integrally forged 42CrMo alloy steel, the raceway is treated by intermediate frequency induction quenching to 55-62 HRC, and the hardened layer depth is more than 3.5mm, which significantly improves the fatigue life and wear resistance of the excavator slewing bearing under impact load, and can be purchased in batches.

42CrMo / 50Mn

Material

55-62 HRC

Raceway hardness

ISO 8

Gear accuracy

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Slewing Bearing for Excavator Features

Deep quenching technology to improve raceway life

The medium frequency induction heating technology is adopted to ensure that the depth of the raceway hardening layer reaches 3mm-5mm, rather than the 2mm commonly used in the industry. This 1 process increases the rated static load of the excavator slewing bearing by 25%, effectively preventing the raceway peeling and plastic deformation caused by long-term heavy-duty operation.

Anti-fracture Design of High Strength Gear

After quenching and tempering treatment, the hardness is controlled at 260-290 HB, and the stress concentration is reduced in combination with the optimized design of the fillet radius of the tooth root. Compared with the cast steel ring gear without tempering, its bending fatigue strength is increased by 40%, which greatly reduces the risk of tooth breakage under the working conditions of “hard rock excavation” or “fast rotation braking.

Precision fit reduces swing clearance

Implement strict axial and radial clearance control standards, and the axial clearance is controlled within the range of 0.05 mm-0. 20mm. Tight fit accuracy reduces the swing, so that the cab operation is more stable, while reducing the impact load on the seal damage.

Weather resistant double lip sealing system

Equipped with ageing-resistant NBR double-lip seals, the temperature range is -30°C to +100°C. The unique labyrinth seal structure can effectively prevent sand dust and muddy water from invading the raceway, prevent grease from being contaminated, and extend the maintenance cycle from the original 500 hours to 750 hours.

100% ultrasonic and magnetic particle testing

Before leaving the factory, each excavator slewing bearing has been tested by UT (ultrasonic flaw detection) and MT (magnetic particle flaw detection). According to JB/T 10471 standard, it is ensured that there are no metallurgical defects such as cracks, slag inclusion or pores inside the forging, and the structural integrity of the product in harsh mine environment.

Universal compatibility and easy installation design

The position tolerance of the mounting hole is controlled within 0.2mm, which is fully in line with the installation size standard of the main engine factory. Wear parts can be directly replaced without on-site secondary processing, greatly reducing equipment downtime and maintenance time, and reducing economic losses due to downtime.

Slewing Bearing for Excavator Detailed parameter table

Parameter item	Technical Specifications/Descriptions
Product Type	Single-row four-point contact ball bearing / Double-row unequal diameter ball bearing / Cross roller bearing
Inner/outer ring material	Forged 42CrMo (4140 Steel) or 50Mn
Rolling Element Material	GCr15 (Chrome Steel)
Raceway Hardness	55 – 62 HRC (Induction Hardening)
Gear surface hardness	50-60 HRC (if required) or tempered 220-290 HB
Hardening Depth	3mm – 6mm (depending on raceway diameter)
Gear Precision Grade	AGMA Level 8-9 / ISO Level 8
Seal Material	NBR / Viton (Fluororubber – Optional)
Lubricant	Lithium-based grease with molybdenum disulfide (MoS2)
Applicable Temperature Range	-30°C to +100°C
Warranty period	2000 working hours or 12 months

Slewing Bearing for Excavator comparison point

This Slewing Bearing for Excavator is designed for high-intensity excavation and crushing operations. Compared with the general-purpose products with ordinary cast steel or uneven surface treatment on the market, we have solved the core problem of early failure of equipment through material upgrading and heat treatment process optimization.

Eliminate the phenomenon of ring gear fracture and tooth chipping

For pain points: many low-end supports break due to insufficient root strength during lateral excavation or emergency stop. Solution: We use 42CrMo forgings to replace 50Mn or cast steel, and the yield strength is increased by more than 20%. In addition, the full teeth are quenched and tempered instead of simple surface quenching, which gives the gear excellent toughness and can absorb sudden impact force without brittle fracture.

Eliminate early raceway spalling and abnormal sound

For pain points: traditional products due to improper handling of soft belt or too thin quenching layer, raceway collapse occurs within 1000 hours of use, resulting in rotation sticking and huge abnormal noise. Solution: We specially mark and distribute the soft belt area of the raceway, that is, the “S” area (quenching overlapping area), and at the same time ensure that the effective hardening layer depth is> 3mm, and the contact surface between the roller ball and the raceway is sufficient to withstand millions of high stress cycles.

Solve internal corrosion caused by seal failure

For the pain point: in the muddy or dust environment, poor quality sealing strip aging off, causing pollutants into the raceway, the formation of abrasive wear, so that the support quickly scrapped. Solution: Standard oil-resistant and aging-resistant NBR double-lip sealing strip, and optimized sealing groove size compression ratio. Even under long-term rotating friction, the seal is still close to the sealing surface, effectively preventing grease leakage and impurity intrusion, and protecting the internal precision structure.

Slewing Bearing for Excavator Applicable Crowd

Construction machinery after-sales maintenance center

For the maintenance plant to undertake various types of excavator overhaul business. The product’s standardized installation size and high interchangeability can help maintenance technicians quickly complete the replacement of the slewing mechanism, and the extremely low repair rate helps maintain the reputation of the repair center.

Slewing Bearing for Excavator Applicable Crowd

Heavy Equipment Leasing Company

For managers with large excavator rental fleet. As rental equipment is often exposed to rough handling, the high durability of the slewing ring and the deepening of the hardened layer can significantly extend the equipment trouble free run time, reduce the life cycle maintenance costs.

Distributors of construction machinery parts

For engineering machinery parts wholesalers around the world. We provide stable quality control and competitive price system, covering a wide range of models from 3 tons to 80 tons, which can meet the needs of distributors for “one-stop shopping” and fast turnover inventory.

Manufacturers of subordinate tools and non-standard equipment

For the production of wood grabs, pile drivers or rotary drilling machine manufacturers. This type of equipment is usually based on the excavator chassis modification, there are specific load requirements for the rotating parts. We can provide customized gear parameters and hole design to perfectly match non-standard working conditions.

Slewing Bearing for Excavator Raw Material

Slewing Bearing for Excavator Raw Material/Material Description

This Slewing Bearing for Excavator strictly selects 42CrMo (equivalent to ASTM 4140) or high-quality 50Mn alloy structural steel as the raw material for inner and outer ring forgings. The raw materials come from large steel mills, and the vacuum degassing process is used to ensure the purity of the steel and the content of non-metallic inclusions is extremely low. Ring forging: ring forging process to ensure that the metal flow line along the circumference of the distribution, significantly improve the mechanical properties and impact toughness of the parts. Rolling body: high carbon chromium bearing steel GCr15, precision grinding and heat treatment, hardness and raceway perfect match. Cage: According to the working conditions, the reinforced nylon PA66 (containing 25% glass fiber) or ZL102 cast aluminum alloy spacer is selected, which has excellent self-lubrication and anti-friction performance.

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.

What brands and models can your excavator slewing bearing adapt?

Our product design follows the industry standard size and is widely adapted to the mainstream excavator brands in the market. Covers a variety of specifications from small excavators of 6 tons to heavy mining excavators of more than 50 tons. For specific cross-exchange models, please provide the original part number or size parameters for our confirmation.

What is the difference between 42CrMo and 50Mn slewing bearings?

42CrMo is the 1 kind of alloy steel, compared with carbon steel 50Mn, it has better hardenability, toughness and fatigue strength. For more than 20 tons of excavators or working conditions (such as broken hammer operation) environment, we strongly recommend the choice of 42CrMo material to obtain a longer service life.

How to install correctly and prevent early damage to the new support?

Before installation, it must be ensured that the installation plane of the excavator base and the upper frame is flat, free of burrs and sufficient rigidity. High-strength (class 10.9 or 12.9) bolts must be used for installing bolts and pre-tightened with torque wrenches in diagonal order. In addition, the “S” mark of the positive soft band area must be aligned so that it is placed in the non-load area (I. e., the position perpendicular to the boom direction).

How long is the lubrication and maintenance cycle of this slewing bearing?

It is recommended to add grease to the raceway after every 100 hours of operation until the grease overflows from the sealing strip. For the tooth surface, it is recommended to check and apply grease every shift. If working in the tropics, high dust or water, the lubrication cycle should be shortened to 50 hours.

If the gear is severely worn but the raceway is intact, can it be repaired?

The excavator slewing bearing is an integral forging part, and the ring gear is integrated with the inner ring or the outer ring. If the gear has broken teeth or excessive wear (resulting in excessive backlash), it is usually not possible to repair it alone and must be replaced in a complete set to ensure safe and accurate operation.

What type of warranty do you provide for your products?

We provide a quality guarantee of 12 months or 2000 working hours (whichever comes first) for standard excavator slewing bearings. The warranty covers problems caused by material defects or manufacturing processes (e. g. quench cracks, out of tolerance).

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

Slewing Bearing for Excavator Check Details & Parameters

Made of integrally forged 42CrMo alloy steel, the raceway is treated by intermediate frequency induction quenching to 55-62 HRC, and the hardened layer depth is more than 3.5mm, which significantly improves the fatigue life and wear resistance of the excavator slewing bearing under impact load, and can be purchased in batches.

Material

42CrMo / 50Mn

Raceway hardness

55-62 HRC

Gear accuracy

ISO 8

Get a Quote

Slewing Bearing for Excavator Features

Deep quenching technology to improve raceway life

The medium frequency induction heating technology is adopted to ensure that the depth of the raceway hardening layer reaches 3mm-5mm, rather than the 2mm commonly used in the industry. This 1 process increases the rated static load of the excavator slewing bearing by 25%, effectively preventing the raceway peeling and plastic deformation caused by long-term heavy-duty operation.

Anti-fracture Design of High Strength Gear

After quenching and tempering treatment, the hardness is controlled at 260-290 HB, and the stress concentration is reduced in combination with the optimized design of the fillet radius of the tooth root. Compared with the cast steel ring gear without tempering, its bending fatigue strength is increased by 40%, which greatly reduces the risk of tooth breakage under the working conditions of “hard rock excavation” or “fast rotation braking.

Precision fit reduces swing clearance

Implement strict axial and radial clearance control standards, and the axial clearance is controlled within the range of 0.05 mm-0. 20mm. Tight fit accuracy reduces the swing, so that the cab operation is more stable, while reducing the impact load on the seal damage.

Weather resistant double lip sealing system

Equipped with ageing-resistant NBR double-lip seals, the temperature range is -30°C to +100°C. The unique labyrinth seal structure can effectively prevent sand dust and muddy water from invading the raceway, prevent grease from being contaminated, and extend the maintenance cycle from the original 500 hours to 750 hours.

100% ultrasonic and magnetic particle testing

Before leaving the factory, each excavator slewing bearing has been tested by UT (ultrasonic flaw detection) and MT (magnetic particle flaw detection). According to JB/T 10471 standard, it is ensured that there are no metallurgical defects such as cracks, slag inclusion or pores inside the forging, and the structural integrity of the product in harsh mine environment.

Universal compatibility and easy installation design

The position tolerance of the mounting hole is controlled within 0.2mm, which is fully in line with the installation size standard of the main engine factory. Wear parts can be directly replaced without on-site secondary processing, greatly reducing equipment downtime and maintenance time, and reducing economic losses due to downtime.

Slewing Bearing for Excavator Detailed parameter table

Parameter item	Technical Specifications/Descriptions
Product Type	Single-row four-point contact ball bearing / Double-row unequal diameter ball bearing / Cross roller bearing
Inner/outer ring material	Forged 42CrMo (4140 Steel) or 50Mn
Rolling Element Material	GCr15 (Chrome Steel)
Raceway Hardness	55 – 62 HRC (Induction Hardening)
Gear surface hardness	50-60 HRC (if required) or tempered 220-290 HB
Hardening Depth	3mm – 6mm (depending on raceway diameter)
Gear Precision Grade	AGMA Level 8-9 / ISO Level 8
Seal Material	NBR / Viton (Fluororubber – Optional)
Lubricant	Lithium-based grease with molybdenum disulfide (MoS2)
Applicable Temperature Range	-30°C to +100°C
Warranty period	2000 working hours or 12 months

Slewing Bearing for Excavator comparison point

Eliminate the phenomenon of ring gear fracture and tooth chipping

For pain points: many low-end supports break due to insufficient root strength during lateral excavation or emergency stop. Solution: We use 42CrMo forgings to replace 50Mn or cast steel, and the yield strength is increased by more than 20%. In addition, the full teeth are quenched and tempered instead of simple surface quenching, which gives the gear excellent toughness and can absorb sudden impact force without brittle fracture.

Eliminate early raceway spalling and abnormal sound

For pain points: traditional products due to improper handling of soft belt or too thin quenching layer, raceway collapse occurs within 1000 hours of use, resulting in rotation sticking and huge abnormal noise. Solution: We specially mark and distribute the soft belt area of the raceway, that is, the “S” area (quenching overlapping area), and at the same time ensure that the effective hardening layer depth is> 3mm, and the contact surface between the roller ball and the raceway is sufficient to withstand millions of high stress cycles.

Solve internal corrosion caused by seal failure

For the pain point: in the muddy or dust environment, poor quality sealing strip aging off, causing pollutants into the raceway, the formation of abrasive wear, so that the support quickly scrapped. Solution: Standard oil-resistant and aging-resistant NBR double-lip sealing strip, and optimized sealing groove size compression ratio. Even under long-term rotating friction, the seal is still close to the sealing surface, effectively preventing grease leakage and impurity intrusion, and protecting the internal precision structure.

Slewing Bearing for Excavator Applicable Crowd

Construction machinery after-sales maintenance center

For the maintenance plant to undertake various types of excavator overhaul business. The product’s standardized installation size and high interchangeability can help maintenance technicians quickly complete the replacement of the slewing mechanism, and the extremely low repair rate helps maintain the reputation of the repair center.

Heavy Equipment Leasing Company

For managers with large excavator rental fleet. As rental equipment is often exposed to rough handling, the high durability of the slewing ring and the deepening of the hardened layer can significantly extend the equipment trouble free run time, reduce the life cycle maintenance costs.

Distributors of construction machinery parts

For engineering machinery parts wholesalers around the world. We provide stable quality control and competitive price system, covering a wide range of models from 3 tons to 80 tons, which can meet the needs of distributors for “one-stop shopping” and fast turnover inventory.

Manufacturers of subordinate tools and non-standard equipment

For the production of wood grabs, pile drivers or rotary drilling machine manufacturers. This type of equipment is usually based on the excavator chassis modification, there are specific load requirements for the rotating parts. We can provide customized gear parameters and hole design to perfectly match non-standard working conditions.

Slewing Bearing for Excavator Raw Material/Material Description

This Slewing Bearing for Excavator strictly selects 42CrMo (equivalent to ASTM 4140) or high-quality 50Mn alloy structural steel as the raw material for inner and outer ring forgings. The raw materials come from large steel mills, and the vacuum degassing process is used to ensure the purity of the steel and the content of non-metallic inclusions is extremely low. Ring forging: ring forging process to ensure that the metal flow line along the circumference of the distribution, significantly improve the mechanical properties and impact toughness of the parts. Rolling body: high carbon chromium bearing steel GCr15, precision grinding and heat treatment, hardness and raceway perfect match. Cage: According to the working conditions, the reinforced nylon PA66 (containing 25% glass fiber) or ZL102 cast aluminum alloy spacer is selected, which has excellent self-lubrication and anti-friction performance.

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