Basic Product Information & Core Positioning
Part Number: 6210-21-1790Product Name: BushingCore Structure: Bimetal composite structure (high-strength steel backing + high-wear-resistant copper alloy inner layer, with lubrication hole design)Core Function: As a sliding bearing component for construction machinery, it forms a wear-resistant buffer layer between the shaft and the bore to reduce friction and wear, absorb impact loads, and store and evenly distribute grease through the lubrication hole, extending the service life of core moving parts such as shafts and pins.Application Scenarios: Core moving mechanisms of Komatsu series construction machinery (such as excavators, bulldozers, heavy-duty trucks), including engines, boom/arm pins, hydraulic cylinders, etc.
Product Usage Instructions
Core Usage Requirements
Installation Compatibility: Strictly match the mounting hole and shaft diameter of the corresponding model. Do not install with over-specification or wrong model to avoid abnormal wear or jamming caused by improper clearance.
Lubrication Requirements: Before installation, fill the corresponding type of grease (such as lithium-based grease for construction machinery) through the lubrication hole on the bushing to ensure the copper alloy inner wall is fully wetted. During use, replenish grease regularly according to the equipment maintenance cycle to avoid dry friction operation.
Working Condition Limits: Suitable for heavy-load, medium-low speed, high-dust construction machinery working conditions. Prolonged use under over-rated load, high-speed dry friction, and strong corrosive environment is prohibited.
Replacement Standard: When the wear of the inner hole of the bushing exceeds the design tolerance (usually 0.1-0.2mm), cracks appear, the copper layer falls off, or the lubrication hole is blocked, replace it immediately to avoid damage to the shaft body.
Applicable Steps (Installation/Replacement Process)
Remove Old Parts: Disassemble the corresponding mechanism (such as boom pin, engine camshaft), take out the worn old bushing, thoroughly clean the inner wall of the mounting hole, and remove oil, rust and impurities.
Bushing Pre-treatment: Check the dimensional accuracy, surface finish and unobstructed lubrication hole of the new bushing, apply a small amount of assembly grease on the outer wall of the bushing for easy press-fitting.
Precise Press-fitting: Use a special press-fitting tool to press the bushing vertically and stably into the mounting hole, ensuring that the end face of the bushing is flush with the end face of the hole position, and the lubrication hole is aligned with the equipment oil circuit.
Shaft Compatibility Check: Install the corresponding shaft/pin into the bushing, check the rotation flexibility, confirm no jamming, abnormal noise, and the clearance meets the equipment technical requirements.
Lubrication & Reset: Fill sufficient grease through the lubrication hole, complete the mechanism reset, conduct no-load trial operation, and put it into use after confirming no abnormality.
Regular Maintenance: Check the bushing wear and replenish grease every 500-1000 hours according to the equipment maintenance manual, and record the operation status.
| Part number | 6210-21-1790 |
| Part Name | BUSHING |
| Condition | Original |
| MOQ | 1 |
| Model | S6D140E SA6D140E |
| Packing | Neutral Packing |
| Apply to | K-OMATSU |
| Model | Excavator |
| Weight | 1KG |
| Delivery | DHL |
Product Type & Category Introduction
| Classification Dimension | Mainstream Types | Features & Application Scenarios |
|---|---|---|
| By Material Structure | Bimetal Composite Bushing (this product type) | Steel backing + copper alloy, high strength + high wear resistance, suitable for heavy-load construction machinery, accounting for over 60% of the market share |
| Pure Copper/Copper Alloy Bushing (Tin Bronze, Aluminum Bronze) | Good self-lubrication, suitable for medium-load, medium-speed working conditions such as textile machinery and pumps | |
| Self-lubricating Graphite Copper Bushing | Embedded solid lubricant, maintenance-free, suitable for extreme working conditions with difficult lubrication | |
| Engineering Plastic Bushing (PEEK, PTFE) | Lightweight, corrosion-resistant, suitable for light-load, high-speed, anti-corrosion scenarios | |
| By Application Position | Hydraulic Cylinder Bushing | The highest proportion in construction machinery (about 35%), suitable for hydraulic cylinder piston rod support |
| Pin Bushing (Boom/Arm/Bucket) | Core wearing parts of excavators, bearing large impact loads | |
| Engine Bushing (Camshaft/Connecting Rod) | High precision, high wear resistance, suitable for high-speed operation of engines | |
| Gearbox/Bearing Seat Bushing | Core of transmission system, ensuring smooth gear operation |
hot-sale products
|
SWITCH |
Related Industry News
Market Size Growth: According to industry reports, the domestic construction machinery bushing market size continues to grow in 2026. Among them, hydraulic cylinder bushings rank first with a 35% share, with a compound annual growth rate of about 8%; the global demand for high-precision copper sleeves/bushings has an annual growth rate of 12.7%, and emergency procurement demand has increased to 29%.
Technology Upgrade Trend: The bushing industry is upgrading towards high wear resistance, long service life and maintenance-free. Bimetal composite, self-lubricating materials and surface coating technology have become R&D hotspots to meet the development needs of large-scale and heavy-duty construction machinery.
Supply Chain Pattern: China is the core production base of global construction machinery bushings. Industrial clusters such as Jining have become core supporting suppliers for international brands such as Komatsu and Caterpillar with a complete supply chain, and foreign trade exports continue to grow.
Industry Standard Upgrade: China is gradually improving industry standards for bushing accuracy, wear resistance and service life, promoting the high-end and standardized development of products and enhancing the international competitiveness of domestic spare parts.
Product Raw Material Dynamic News
Core Raw Material Market Dynamics
The core raw materials of this product are steel backing (low-carbon steel) and copper alloy (tin bronze, lead bronze, etc.). The industry dynamics from 2025 to 2026 are as follows:
Copper Price Fluctuation Impact: Copper material cost accounts for more than 60% of the production cost of bushings. Copper prices continued to fluctuate at a high level in 2026, forcing the industry to seek cost reduction solutions, and the penetration rate of alternative materials such as filament-wound self-lubricating bearings has increased.
Copper Alloy Material Upgrade: High-wear-resistant aluminum bronze, high-strength brass and other high-performance copper alloys have become mainstream, adapting to heavy-load working conditions. At the same time, the industry is strengthening the environmental protection process upgrade of lead bronze and other materials to meet international environmental protection standards.
Supply Chain Security: The global supply of non-ferrous metals such as copper and tin is affected by geopolitics, and the industry is promoting domestic substitution of raw materials to improve supply chain stability.
Material Innovation: New materials such as metal matrix composites and ceramic-coated copper sleeves are gradually being applied, further improving the wear resistance and anti-seizure performance of bushings and extending service life.
Industry Raw Material Trends
Stricter environmental requirements promote the popularization of lead-free copper alloys and green casting processes.
Under the demand for lightweight, composite structures with high-strength steel backing and ultra-thin copper layers have become R&D directions, reducing copper consumption while ensuring performance.
The application proportion of recycled copper and recycled steel has increased, helping the industry achieve carbon neutrality goals.
Our team
In 2024, most overseas customers were interested in the engineering parts, and kept contact information and just meals with each other.
Overseas customers praise the quality of our direct sales products, solenoid valve sets, switches and various types of sensors.
Customers gave a good evaluation of our company's main products through the detailed explanation of the sales manager and expressed their willingness to cooperate.
01
High Quality
High-quality accessories are meant to be shared-pass this on to fellow operators who need dependable parts!
02
Advanced Equipment
Brand-new construction machinery parts bring more demand to customers.
03
Professional Team
Professional team gives customers a full understanding of product performance and better use.
04
Custom Service
High-quality after-sales service, solve difficult problems for customers and guide them how to deal with them.
Supplementary Notes (Foreign Trade Adaptation)
This part number is a Komatsu original standard part, which can directly meet the maintenance and upkeep needs of overseas customers' Komatsu series construction machinery, complies with international construction machinery parts quality standards, and is a popular category for foreign trade exports. Multilingual (English/Japanese) product descriptions, technical parameters and after-sales support can be provided.
-
6210-21-1790 -
S6D140E
Case Study Display
5-Star Customer Review
Verified Purchase | Fast Shipping | Perfect Performance.Our quality is guaranteed, and many overseas customers have given positive reviews and feedback after purchasing, stating that the performance advantages are good and they are willing to buy again. Moreover, some customers have specifically come to your company for on-site inspections and have expressed their willingness to enter into a long-term partnership with our company
ONegotiating with overseas clients
Great moments with our overseas partner!Quality wins trust, service builds long-term cooperation.We supply reliable construction machinery parts to the world.Welcome more partners to cooperate with us!
jining Tongderui Construction Machinery Co., Ltd. was established in 2011, mainly engaged in excavator parts, loader parts, bulldozer parts and dump truck parts. Our company has a high-quality professional technical research and development team engaged in product research and development in the field of Construction equipment all year round, with strong technical force.As the core force of the company's business expansion, the sales team has extensive experience and has participated in bauma CHINA in Shanghai twice in 2018 and 2024, establishing long-term cooperative relationships with international customers and accumulating rich industry resources and market insights.
Our address
jining Tongderui Construction Machinery Co., Ltd,Shandong, China
Phone Number
(+86)18843672885
songwei@tdrzl.com
Hot Tags: new bushing 6210-21-1790 for s6d140e parts, China new bushing 6210-21-1790 for s6d140e parts manufacturers, suppliers, factory
