Product Video
Products Description
|
Brand |
Product Name |
Model |
Weight/pc |
Part Number |
|
Hitachi |
Track Roller |
1200 |
236.52KG |
4666752 |
Product Details
|
Product Name |
Track Roller |
|
Part Number |
4666752 |
|
Origin |
Japan |
|
Brand Name |
STONE |
|
Model |
1200 |
|
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 |
Hitachi Genuine Factory Color or Customizable |
|
Application |
Excavator |
|
Customizable |
including customized materials, surface treatment and specifications |
Product advantages
High-Strength Alloy Forged Structure for 120-ton Class Loads
The Hitachi 1200 Track Roller adopts grain-refined 50Mn alloy steel integral forging to eliminate internal defects. With tensile strength ≥980MPa and yield strength ≥785MPa, it withstands alternating heavy loads of 120-ton excavators in mining/earthwork conditions, preventing wheel deformation and fatigue cracking.
Controlled-Depth Induction Hardened Raceway
Raceway surface is high-frequency induction quenched, with 5-7mm hardened layer, surface hardness HRC 52-58 and core hardness HB 240-280, delivering "hard surface & tough core" properties.
Designed for 120-ton class equipment, it resists mining abrasive wear and delays raceway pitting and spalling failure.
High-Reliability Floating Seal System
Precision paired and lapped floating oil seals (Ra ≤0.2μm roughness, ≤0.02mm fitting clearance) paired with high-temperature resistant fluororubber O-rings deliver stable sealing performance across -40°C to 120°C.
This structure effectively isolates muddy water and dust, prevents grease leakage and contamination, and adapts to long-term wading and muddy operation scenarios of EX1200 excavators.
Precision-Fit Shaft & Bushing Assembly
Hitachi 1200 Track Roller features precision-ground shaft journals (Ra ≤0.8μm) paired with copper-based wear-resistant bushings. Controlled 0.03–0.05mm clearance forms a stable hydrodynamic lubricating film under heavy load, preventing adhesive wear and seizure.
It adapts to high-frequency traveling cycles of heavy-duty excavators, reducing rotational resistance and mechanical loss for long-term stable operation.
Production process
Integrated precision forging forming
Our Hitachi 1200 Track Roller adopts 50Mn high-quality alloy steel integral forging molding. The raw materials are subject to fixed-component metallurgical inspection and density detection to ensure uniform internal grain structure and no porosity defects. The material features high compressive strength and structural stability, adapting to the high-load abrasive working conditions of mining and large-scale earthwork, and meets the long-cycle operation structural strength standards of heavy-duty excavators.
CNC finishing and precise gear machining
The forged blank is processed by multi-axis CNC machine tools to complete the finishing of the roller body, shaft journal and sealing mating surfaces. Key dimensions are controlled within ±0.02mm tolerance, and the sealing surface roughness is processed to Ra ≤ 0.2μm. Precision machining ensures the coaxiality of all components and the matching accuracy of the floating seal assembly, laying the foundation for stable rotation and reliable sealing.
Multiple professional heat treatment processes
The Hitachi 1200 Track Roller undergoes a complete set of heat treatment processes including quenching, tempering and high-frequency induction hardening. The roller raceway is induction quenched with a controllable hardened layer depth of 5–7mm, achieving surface hardness of HRC 52–58 while maintaining the core hardness at HB 240–280. This balances wear resistance and impact toughness, effectively improving contact fatigue resistance under heavy loads and adapting to high-abrasion mining conditions.
Gradual inspection and full factory testing
Each roller goes through a full range of quality inspections before delivery, including dimensional verification, hardness testing, non-destructive flaw detection and seal performance testing. A simulated heavy-load operation test is also conducted to verify rotation flexibility, sealing reliability and load-bearing capacity. Only products passing all tests are shipped, ensuring stable performance and long service life in actual working conditions.
Working Performance
Stable and smooth slewing operation
It features smooth start and stop with no stalling or jittering. The slewing rotation is uniform and steady during operation, delivering precise control feel. It greatly improves the fluency of compound operations such as loading, leveling and rock excavation.
Strong overload and anti-overturning capacity
Our Hitachi 1200 Track Roller is purpose-built for the extreme heavy-duty working conditions of the 120-ton class Hitachi EX1200 excavator. It reliably withstands continuous alternating heavy loads, lateral eccentric forces and high-impact shocks encountered in mining and large-scale earthmoving operations. With high structural rigidity and excellent deformation resistance, it maintains stable contact with the track chain even under the most demanding conditions, ensuring smooth traveling performance and avoiding premature structural damage caused by overload.
Wear-resistant with low failure rate
High meshing precision of raceway and gear surface provides excellent resistance to pitting, peeling and abrasion. Under long-term high-intensity continuous operation in mines and construction sites, the slewing clearance remains stable with little change, and abnormal noise or looseness rarely occurs.
Excellent tightness and adaptability to harsh conditions
Our Hitachi 1200 Track Roller adopts a precision floating seal system optimized for extreme working conditions. The high-performance sealing structure effectively blocks dust, sediment, and rainwater from entering the interior, preventing lubricant leakage and abrasive wear caused by impurities. Built to withstand the harsh, dusty, and humid environments of mining and large earthwork sites, it ensures stable long-term operation, reduces the risk of premature failure, and extends maintenance cycles significantly.
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 Causes Early Spalling and Pitting on the Track Roller Raceway?
This failure is mainly caused by insufficient hardened layer, contaminated lubricant, improper track tension, and uneven load. Our Hitachi 1200 Track Roller features a precisely controlled 5–7mm hardened layer (HRC 52–58 surface hardness, HB 240–280 core hardness), effectively resisting contact fatigue and abrasive wear under heavy mining loads, delaying raceway damage.
Why Does The Track Roller Experience Persistent Oil Leakage At The Floating Seal Interface?
Leakage usually stems from damaged seal faces, aging O-rings, dimensional deviations, or overfilled grease. Our roller features precision-machined seal faces (Ra ≤ 0.2μm) and heat-resistant fluororubber rings for stable, reliable sealing.
What Leads To Seizure or Stiff Rotation Between The Track Roller Shaft and Bushing?
Poor lubrication, rough surface, unqualified fitting clearance and corrosion will cause rotation failure. Use NLGI 2 extreme-pressure grease and keep clearance at 0.03–0.05mm during assembly. Hitachi 1200 Track Roller is produced with strict tolerance control to avoid such problems.
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