Product Video
Products Description
|
Brand |
Product Name |
Model |
Weight/pc |
Part Number |
|
Caterpillar |
slew gear bearing |
390D |
1385.91 KG |
2276099 |
Product Details
|
Product Name |
slew gear bearing |
|
Part Number |
2276099 |
|
Origin |
United States |
|
Brand Name |
STONE |
|
Model |
390D |
|
Price |
Negotiable |
|
Packing Details |
Standard Export Packing |
|
Delivery Time |
0-30 Days |
|
Payment Term |
L/C, T/T |
|
Price Term |
FOB, CIF, CFR |
|
Supply Capacity |
50,000 PCS/Month |
|
Minimum Order Quantity |
1 PC |
|
Material |
High Quality Steel |
|
Technology |
Precision Machining |
|
Surface |
Treatment Anti-Corrosion Coating |
|
Hardness |
HRC 48-52 |
|
Quality |
Original Factory Standard |
|
After-Sales Service |
Full Support, Online Service |
|
Color |
Standard Caterpillar Yellow or Customizable |
|
Application |
Excavator |
|
Customizable |
including customized materials, surface treatment and specifications |
Applicable Models
|
390D |
385C |
| 390F |
395 |
Product advantages
Caterpillar 390D
Specifications:
Engine Model: Cat® C18 ACERT™ (ATAAC)
Net Flywheel Power: 390 kW
Operating Weight: 86190 kg
Track
Number of Shoes - Each Side - Long Undercarriage: 51
Number of Carrier Rollers - Each Side: 3
Number of Track Rollers - Each Side - Long Undercarriage: 9
High-Strength Alloy Carburizing Steel Matrix
The matrix utilizes premium alloy carburizing steel, enriched with elements such as chromium, nickel, and molybdenum, which imparts outstanding strength, toughness, and impact resistance, laying a solid foundation for withstanding substantial composite loads.
Deep Carburizing and Gradient Hardening
Key components undergo precise deep carburizing heat treatment, forming an ultra-high hardness hardened layer several millimeters deep on raceways and gear tooth surfaces, while the core retains high strength and toughness. This achieves the ideal "hard surface, tough core" mechanical properties, resulting in excellent fatigue resistance and service life.
Ultra-High Hardness Treatment of Critical Surfaces
After carburizing and quenching, the slew gear bearing's raceway and gear meshing surfaces achieve extremely high hardness. Combined with the subsequent precision grinding process, this provides excellent wear resistance and anti-spalling capability, effectively handling severe friction under heavy loads.
Full-Process Material Uniformity Control
Strict metallographic and hardness gradient monitoring is implemented throughout the entire process, from steel smelting to final heat treatment, ensuring uniform material structure and defect-free quality. This serves as the fundamental guarantee for stable bearing operation and prevention of premature failure.
Production process
Precision Forging and Pre-Treatment
This slew gear bearing is formed using a multi-directional precision die forging process. This technique ensures that the metal grain flow strictly and continuously follows the component's contours, thereby significantly enhancing material density, fiber continuity, and overall load-bearing strength. Following the forging operation, the component undergoes a strictly controlled normalizing treatment. This procedure aims to homogenize the grain structure and eliminate internal stresses induced during forging, providing a high-quality base with dimensional stability and low residual stress for all subsequent precision machining processes.
CNC Precision Machining and Tooth Profile Forming
Both the gear teeth and the critical mounting datum hole systems are machined in a single setup on a high-performance multi-axis CNC machining center. This process strategy minimizes datum conversion errors, ensuring extremely high dimensional accuracy and mutual positional tolerances between the gears and their mounting interfaces. The final tooth profile is generated using a high-precision form grinding process. The resulting gears exhibit high tooth profile accuracy and excellent surface finish, thereby guaranteeing smooth transmission system operation, low noise levels, and achieving an ideal load distribution across the tooth flanks.
Controlled Atmosphere Deep Carburizing and Quenching
The carburizing heat treatment is conducted in a controlled atmosphere continuous carburizing furnace. By precisely controlling the process curves for furnace atmosphere carbon potential, temperature, and time, an ideal carburized hardening layer with the specified depth and a gradual hardness gradient is achieved on the bearing raceways and gear tooth surfaces. Following carburizing, press quenching is immediately performed on a dedicated quenching press. This technology applies controlled pressure to the parts during the quenching cooling process, thereby maximally suppressing and correcting quenching distortion and ensuring the part's geometric accuracy.
Precision Grinding and Full-Process Inspection
After quenching, key areas such as the working raceway surfaces and mounting/locating planes undergo final form grinding using high-precision CNC grinding machines to achieve micron-level geometric accuracy and excellent surface roughness. The entire manufacturing process incorporates a full-chain quality inspection protocol, including ultrasonic/magnetic particle non-destructive testing, carburized case depth and hardness gradient testing, and comprehensive three-dimensional dimensional measurements. This ensures that every finished product is free from internal defects, meets surface hardness specifications, has zero dimensional deviation, and its performance fully complies with the design specifications.
Precautions for use
Professional Installation, Precise Positioning
Installation must be performed by qualified personnel using dedicated tools. Ensure that the slew gear bearing and mounting surfaces are clean, flat, and free of burrs. Fastening bolts must be tightened step-by-step in the specified sequence and to the required torque. Direct impact on raceways or gears is strictly prohibited to prevent deformation or micro-cracks.
Standardized Lubrication, Thorough Cleaning
Only the original or equivalent grease of the brand and grade specified by the equipment manufacturer must be used. Ensure grease nipples and oil passages are clean before lubrication. Follow the prescribed lubrication intervals and quantities to avoid insufficient lubrication or contamination, which is critical for ensuring service life.
Avoid Overloading and Impact Starts
Avoid prolonged operation of the equipment beyond its rated load. Especially during start-up, slewing, and stopping, operate as smoothly as possible to reduce sudden impact loads. This is key to preventing gear fracture and early-stage indentations on raceways.
Maintain Cleanliness, Prevent Contaminant Ingress
Regularly inspect and maintain the integrity of bearing seals. Promptly remove accumulated foreign matter such as mud, dust, and debris around the seal rings to prevent abrasive particles from entering the raceways, which can cause accelerated wear.
Regular Inspection, Timely Adjustment
In accordance with equipment maintenance cycles, regularly inspect gear meshing conditions, bolt tightening torque, abnormal noise or vibration, and any seal leakage. If abnormal wear or excessive clearance is found, adjustments should be made promptly or technical personnel should be consulted.
Standardized Storage, Proper Maintenance
Spare bearings should be stored in a dry, clean indoor environment and treated with rust prevention. If the equipment is to be idle for an extended period, manually rotate the slewing system periodically. Before putting the equipment back into service, check the lubrication condition to avoid lubricant separation or localized corrosion due to prolonged stillness.
Product Safety and Quality Assurance
Rigorous Testing
Each product undergoes a series of tests before leaving the factory, including ultimate load, fatigue life, and simulated harsh working conditions. These tests validate reliability with authentic performance data.
Durability and Reliability
This slew gear bearing is manufactured using deep carburized steel and precision manufacturing processes, featuring exceptional wear resistance and impact resistance. It ensures long-term stable operation under heavy-load, high-frequency working conditions, delivering an extended service life.
Performance Assurance
Strictly adhering to original equipment manufacturer specifications, the product provides high load-bearing capacity and smooth power transmission. It ensures perfect compatibility with the host machinery, enabling continuous and efficient equipment operation.
Stock Availability
Standard models are kept in sufficient inventory, enabling rapid delivery. This effectively reduces customer equipment downtime and supports efficient project progress.
STONE
Stone is a leading supplier of engineering machinery parts, focusing on providing high-quality parts for mining companies. Since its establishment in 2004, we have been based in Shanghai, China, and have built our own brand STONE, becoming a trusted choice in the industry. We are committed to providing a variety of parts including bulldozers, excavators and wheel loaders for well-known brands such as Caterpillar and Komatsu. Our product line covers a full range of OEM parts, such as Track Chain, Track Rollers, Sprocket, Excavator Buckets, Blades, Excavator Cylinders, Swing Circles, and various electrical and hydraulic components to ensure that our customers' stringent requirements for quality and performance are met.
quality
years experience
service
hours warrant
Q＆A
What is the most critical thing to pay attention to during installation?
Preparation: Ensure that the mounting surfaces (upper and lower frames) are absolutely flat, clean, and free of burrs, paint, or old sealant residue.
Alignment: Place the bearing smoothly, ensuring proper meshing between the gear and the drive pinion.
Tightening: Use the original high-strength bolts specified by the manufacturer and tighten all bolts in three steps-30% → 70% → 100% of the torque value-symmetrically and alternately. This is key to preventing deformation and ensuring proper preload.
Inspection: After installation, manually rotate the bearing several times to check for smooth operation and verify the gear meshing clearance.
How often should lubricant be reapplied?
General recommendation: Reapply grease to the raceway every 50 working hours.
Reason: Grease gradually depletes, ages, and may be squeezed out during operation. Regular replenishment reduces wear, prevents rust, and removes contaminants.
Detailed procedure:
Raceway lubrication: Inject the grease specified by the equipment manufacturer (such as Caterpillar's special multi-purpose grease) through the grease fittings on the outer ring until fresh grease emerges from the seal edges, indicating the old grease has been expelled.
Gear lubrication: It is recommended to clean and reapply a layer of grease to the gear surfaces every 10 work shifts (approximately 80–100 hours) to prevent abrasive wear and corrosion.
Note: In harsh working conditions such as high dust, humidity, or continuous heavy-duty operation, the lubrication interval should be appropriately shortened.
What causes abnormal noises during operation?
Abnormal noise is a clear sign of malfunction and requires immediate investigation.
Possible causes and solutions:
Insufficient lubrication (most common): Dry friction occurs in the raceway or gears due to lack of grease. Solution: Stop the machine immediately and replenish grease according to the specified intervals and standards mentioned above.
Improper installation: Uneven mounting surfaces cause negative clearance (preload), jamming the rolling elements. Solution: Disassemble and inspect the flatness of the mounting surfaces; machine or add shims for adjustment if necessary.
Internal damage: Such as broken rolling elements (steel balls) or pitting on the raceway. Solution: Stop the machine and contact professional technicians for disassembly and inspection. Decide whether to repair or replace based on the extent of the damage.
Poor gear meshing: Excessive or insufficient gear backlash, or misalignment of axes. Solution: Adjust the position of the drive pinion to ensure the gear meshing clearance meets the original manufacturer's standards.
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