Doosan Excavator slewing bearing

Full Model Coverage: DH55, DH60, DH80, DX150, DH215, DH220, DH225, DX225, DX260, DH300, DX300, DH370, DX380, DX420, DX500, DX520, DX800, and others.
Service & Support:We maintain a large inventory of stock with a complete range of models available; we also offer reverse engineering services for existing bearings to facilitate the custom manufacturing of brand-new replacements.
Common Structural Forms and Application Conditions
Single-Row Four-Point Contact Ball Structure
Features: Compact structure, flexible rotation, smooth operation, and low noise levels.
Capabilities: Capable of simultaneously withstanding axial loads, radial loads, and overturning moments.
Single-Row Cross-Roller / Three-Row Roller Structure
Features:High load-bearing capacity, high rigidity, and excellent resistance to impact and overturning forces.
Applications: Perfectly suited for extreme operating conditions involving heavy loads, high-frequency rotation, and mining/crushing operations.

Product Description

Doosan Excavator Slewing Bearing: Complete Guide for Heavy Equipment Applications

At Luoyang Heng Guan Bearing Technology, we specialize in manufacturing high-performance Slewing Bearings designed specifically for Doosan Excavator slewing bearing. This critical rotational component connects the superstructure to the undercarriage, enabling smooth slewing operations while simultaneously handling axial loads, radial loads, and tilting moments. Whether you're operating a compact DH60 or a heavy-duty DX800, the right slewing bearing directly impacts your equipment's productivity, maintenance costs, and operational safety.Contact our engineering team: mia@hgb-bearing.com

What Is a Doosan Excavator Slewing Bearing?

A slewing bearing is a specialized large-diameter rolling element bearing designed specifically for excavator rotation systems. It serves as the mechanical interface between the rotating upper structure and the stationary undercarriage.

Core Functions:

Enables smooth 360-degree rotation of the cab and boom assembly
Distributes operational loads across precisely engineered raceways
Integrates gear teeth (internal or external) for direct drive connection
Provides stable load path for digging, lifting, and swinging operations

Doosan Excavator slewing bearing factory

Doosan Excavator slewing bearing Packaging & shipping

Doosan Excavator slewing bearing installation

Specifications Reference

Parameter	Range/Options
Outer Diameter	500mm - 3,200mm (model dependent)
Bearing Type	Single-row ball, cross-roller, three-row roller
Gear Type	Internal or external
Raceway Hardness	HRC 55-62
Gear Hardness	HRC 45-50
Material	50Mn / 42CrMo alloy steel
Precision Grade	P0, P6, P5, P4 (application dependent)
Seal Type	Multi-lip, labyrinth, or combination
Lubrication	Grease (re-lubrication capability)
Operating Temperature	-30°C to +80°C (standard)

Doosan Model Product Parameters

Brand	Model	Part Number	Outer Diameter	Inside Diameter	Total height	Outer Height	Inner Height	Outer Hole Parameters	Inner Hole Parameters	Number of Teeth
Doosan	S140LC-V	109-00165	1202	945	84	75	70	36-Ф22	36-M20	80
	DX225	109-00162	1327	1082	110	90	95	36	36	92
	DX225	109-00162A	1327	1082	110	90	95	36-φ21	36-M20*1.5	92
	DX225LC	109-00162	1327	1082	110	90	95	36-φ21	36-M20*1.5	92
	DX225LCA	109-00162A	1327	1082	110	90	95	36-φ21	36-M20*1.5	92
	DX225LCA	140109-00048A	1327	1082	110	90	95	36-φ21	36-M20*1.5	92
	S225NLC	140109-00045	1327	1082	110	90	95	36-φ21	36-M20*1.5	92
	SL220LC-V	109-00052	1328	1084	110	91	95	36-φ21	36-M20*1.5	92
	225NLC-V	109-00052B	1328	1084	110	91	95	36-φ21	36-M20*1.5	92
	225NLC-V	140109-00045	1328	1084	110	91	95	36-φ21	36-M20*1.5	92
	255LC-V	109-00030B	1410	1131	117	89	105	35-φ25	36-M24*2	82
	255LC-V	180-00297D3	1410	1131	117	89	105	35-φ25	36-M24*2	82
	255lc-v	140109-00042	1410	1131	117	89	105	35-φ25	36-M24*2	82
	255lc-v	140109-00043	1410	1131	117	89	105	35-φ25	36-M24*2	82
	Dx300LCA	140109-00010A	1475	1165	120	90	110	35	36	85
	S340	140109-00038	1544	1235	122	87	110	35-φ26	40-M24	90
	S340LC-V	140109-00038	1544	1235	122	87	110	35-φ26	40-M24	90
	S340LC-V	2109-1059a	1544	1235	122	87	110	35-φ26	40-M24	90
	DOOSAN 420	140109-00039	1549	1235	134	103	120	35-φ26	40-M24	90
	S420LC-V	109-00161	1550	1235	135	102	120	35-φ26	40-M24	90
	DX420LC	140109-00007A	1550	1236	132	103	120	35	40	90
	470	109-00159	1682	1320	139	118	111	44	44	111

Structural Design and Load Capacity

Single-Row Four-Point Contact Ball Structure

Design Features:

Compact axial height for space-constrained applications
Gothic arch raceway geometry for multi-directional load handling
Low friction characteristics for smooth rotation

Load Capabilities:

Simultaneous axial, radial, and moment load resistance
Suitable for general excavation and material handling

Operational Benefits:

Smooth, quiet operation with minimal vibration
Reduced power consumption during slewing
Extended seal life due to lower internal friction

Single-Row Cross-Roller / Three-Row Roller Structure

Design Features:

Crossed roller bearing for enhanced rigidity
Larger rolling element diameter for higher load ratings
Reduced elastic deformation under peak loads

Load Capabilities:

Superior resistance to shock loads and impact forces
Higher tilting moment capacity for extended boom configurations
Better performance under continuous heavy-duty cycles

Operational Benefits:

Ideal for mining, quarrying, and demolition applications
Maintains precision under extreme loading conditions
Longer service life in high-stress environments

Manufacturing Process and Material Selection

High-Strength Alloy Steel Rings

Material Grade:50Mn / 42CrMo alloy structural steel

Processing Method:

Integral forging creates dense grain structure
Eliminates internal voids and inclusions
Achieves superior tensile strength and impact resistance

Performance Result:

Maintains dimensional stability under thermal cycling
Resists plastic deformation under peak loads
Provides reliable foundation for raceway hardening

Precision Raceway Hardening

Process:Medium-frequency induction hardening

Technical Parameters:

Surface hardness: HRC 55-62
Case depth: 3-5mm
Hardness gradient optimized for load distribution

Functional Benefits:

Exceptional resistance to rolling contact fatigue
Superior wear resistance against abrasive contamination
Eliminates surface spalling and brinelling under shock loads
Prevents crack initiation and propagation

Critical Customer Concerns and Solutions

High Load Capacity Requirements

Your Concern:Will the Doosan Excavator slewing bearing handle extreme digging forces without raceway failure?

Our Solution:

Finite element analysis validates load distribution
Reinforced raceway design with optimized contact stress
Material selection proven in mining applications
Load ratings exceed operational requirements by safety margin

Service Life and Durability

Your Concern:How long will the bearing last before replacement?

Our Solution:

Advanced heat treatment extends fatigue life
High-purity alloy steel eliminates early failure modes
Comprehensive life testing validates design assumptions
Field data shows extended service intervals compared to standard bearings

Custom Solutions and Reverse Engineering

On-Site Measurement Service

When original drawings are unavailable, our engineering team provides:

Field Data Collection:

Precise measurement of all critical dimensions
Bolt hole pattern documentation
Gear parameter verification
Wear pattern analysis for design optimization

Non-Standard Customization

Design Flexibility:

Modified dimensions for retrofit applications
Gear parameter changes for different drive systems
Seal configuration geared to operating environment
Material upgrades for extreme conditions

Engineering Support:

Load calculation assistance
Bearing selection recommendations
Installation procedure development
Technical consultation throughout project lifecycle

Quality System and Manufacturing Capability

Certifications and Standards

ISO 9001 quality management system
RoHS compliance for environmental requirements
Manufacturing processes aligned with international bearing standards

Forged Ring certification

Production Equipment

CNC Machining Centers:

Vertical lathes for diameter range 50-10,000mm
Precision grinding machines for raceway finishing
Large gear hobbing equipment for tooth cutting
Coordinate measuring machines for dimensional verification

Global Supply Capability

Export Experience:

Products shipped to 50+ countries
Established logistics networks in Europe, Americas, Middle East, and Southeast Asia
Export documentation and customs support
Flexible shipping terms (FOB, CIF, DDP options)

Inventory Management:

Common models maintained in stock
Fast delivery for standard configurations
Production scheduling for custom orders
Bulk order capacity for fleet maintenance

Exhibition

FAQ

Q: How do I confirm the rectify bearing demonstrate for my Doosan excavator?

A: Send us your excavator show number or existing bearing measurements, and we’ll affirm the redress specification.

Q: Can you supply bearing with distinctive gear specifications?

A: Yes. We can customize equip parameters to coordinate your application requirements.

Q: What support is recommended?

A: Review routinely, re-lubricate each 500 hours, and check gear work and jolt torque annually.

Q: Do you give establishment support?

A: Yes. We offer establishment enlightening and inaccessible specialized assistance.

Q: What guarantee is included?

A: Standard guarantee covers fabricating abandons for 12 months or 2,000 working hours.

Q: Can you coordinate bearing from other excavator brands?

A: Yes. We give substitution and overhaul arrangements for most major excavator brands.

Contact Us for Technical Consultation

Our engineering team is ready to assist with bearing selection, custom design, or technical questions about Doosan Excavator slewing bearing applications.

Email: mia@hgb-bearing.com

WHAT OUR CUSTOMERS SAY

Here is the customer's evaluation of us

From Europe

As a leading construction machinery manufacturer in Europe, we are very impressed with the quality and performance of your slewing rings. The precision machining and consistent quality meet our strict standards. A reliable global supplier!

From United States

Our CT scanners require extremely smooth rotation, low noise, and no magnetic interference. Your product perfectly meets these requirements, operating virtually silently without compromising image quality. Your technical expertise is truly impressive!

From Southeast Asia

We have been the distributor of your brand for many years and have received excellent customer feedback. Your diverse product line meets diverse customer needs, and our consistent quality makes us very competitive in the market. Your technical support and service team are also fantastic!

From United States

The slewing bearing selected for our wind turbine main drive system has exceeded our expectations in terms of precision and reliability. It operates smoothly even in extreme wind conditions and has a long maintenance cycle, significantly reducing our lifecycle costs. We are a trustworthy partner!

From the Middle East

Our equipment required a slewing bearing with non-standard dimensions and special gears. We contacted several companies but they all said they couldn't make it. Not only did you accept the order, but we also communicated smoothly throughout the entire process from proofing to mass production, and the finished product fully met our design requirements. This customization capability demonstrates your true technical strength.

From Europe

We have integrated your slewing rings into our new line of crawler cranes. The performance under full load and in extreme weather conditions has been flawless. The precision and durability meet the highest European standards. A truly reliable component for critical applications.

From North America

The harsh, sandy environment of our port is a true test for any equipment. Your slewing bearings' superior sealing system has effectively kept out abrasive contaminants. Our ship-to-shore cranes have seen a dramatic increase in uptime and service life since switching to your brand.

From the Middle East

In the mining industry, equipment failure is not an option. The immense strength and robust construction of your large-diameter slewing bearings have withstood the incredible shocks and loads in our mining excavators. Their reliability is directly contributing to our productivity.