Hitachi ZX870 ZX870-5G Excavator Carrier Roller Top Roller Upper Roller Undercarriage Track Carrier Roller Assembly Heavy Duty Mining Replacement
Model: ZX870CR
Min. Order: 1 Pieces
- Product Name:
- Carrier Roller
- Part Type:
- Top Roller / Upper Roller
- Application Brand:
- Hitachi
- Compatible Models:
- Hitachi ZX870 / ZX870-5G
- Lead Time:
- in stock
- Supply Ability:
- 10,000 Pieces
- Shipping Port:
- Xiamen, China
Product Features & Applications
Heavy-duty Carrier Roller (Top Roller / Upper Roller) for Hitachi ZX870 and ZX870-5G crawler excavators. Designed to support and guide the upper section of the track chain while maintaining correct track alignment under extreme working conditions. Manufactured from high-strength 40Mn2 alloy steel with precision machining, advanced heat treatment and heavy-duty floating seal technology. The carrier roller provides excellent load-bearing capacity, wear resistance and reliable service life for large-scale mining, quarry and heavy earthmoving applications. Compatible with Hitachi ZX870 series undercarriage systems as an OEM-style aftermarket replacement. Please provide your machine serial number, existing OEM part number or carrier roller dimensions to confirm the exact fitment before ordering.
Product Overview
The Carrier Roller, also known as Top Roller or Upper Roller, is mounted above the track frame of the Hitachi ZX870 crawler excavator.
For an 80-ton class excavator, the undercarriage system operates under extremely high dynamic loads during excavation, travelling and mining operations. The carrier roller supports the upper track chain, maintains chain alignment and reduces friction between moving undercarriage components.
A worn or damaged carrier roller may cause:
- Excessive track chain vibration
- Abnormal travelling noise
- Increased track resistance
- Uneven chain movement
- Accelerated wear of track links and bushings
- Increased operating downtime
Our ZX870 carrier rollers are manufactured with professional undercarriage production technology and provide a reliable aftermarket replacement solution for mining contractors, equipment dealers and repair workshops.
Key Features & Benefits
Heavy-Duty Mining Application
Designed for:
Hitachi ZX870 / ZX870-5G
Suitable for:
- Open-pit mining
- Quarry operations
- Heavy construction
- Large-scale earthmoving
High-Strength Alloy Steel
Manufactured from:
40Mn2 Alloy Steel
Benefits:
- High load-bearing capability
- Excellent impact resistance
- Strong fatigue resistance
- Superior wear performance
- Extended service life
Advanced Heat Treatment
The roller working surface is processed with controlled induction hardening.
Typical specification:
- Surface hardness: HRC 52-58
- Hardening depth: 10mm-15mm
Provides improved resistance against continuous heavy loading and abrasive mining environments.
Heavy-Duty Floating Seal System
Equipped with:
- Heavy-duty floating oil seals
- Wear-resistant bushings
- Lifetime internal lubrication
The sealing system helps prevent lubricant leakage and protects internal components from mud, dust and water contamination.
OEM-Style Direct Replacement
Manufactured according to OEM-style dimensions:
- Roller diameter
- Shaft dimensions
- Mounting dimensions
- Track chain contact surface
Designed for direct replacement after confirming correct specifications.
Technical Specifications
| Item | Specification / Detail |
|---|---|
| Product Type | Excavator Undercarriage Carrier Roller |
| Machine Model | Hitachi ZX870 / ZX870-5G |
| Compatible Models | ZX870, ZX870-5G |
| Machine Type | Crawler Excavator |
| Machine Class | Approx. 87 Ton |
| OEM Part Number | 4638433 |
| Material Grade | 40Mn2 Alloy Steel |
| Manufacturing Process | Forging / Casting + CNC Machining |
| Heat Treatment | Induction Hardening |
| Surface Hardness | HRC 52-58 |
| Hardening Depth | 10mm-15mm |
| Seal System | Heavy-duty Floating Oil Seal |
| Lubrication System | Lifetime Internal Lubrication |
| Bearing Structure | Hardened Shaft + Wear-resistant Bushing |
| Quality Inspection | Dimension, Hardness and Sealing Inspection |
| Mounting Configuration | OEM Standard |
| Installation | Bolt-on Direct Replacement |
| Application | Mining / Heavy Construction |
| Shipping Note | Heavy Component — Sea Freight Recommended |
Technical Specifications
- Product Name
- Carrier Roller
- Part Type
- Top Roller / Upper Roller
- Application Brand
- Hitachi
- Compatible Models
- Hitachi ZX870 / ZX870-5G
- Machine Class
- Approx. 87 Ton Excavator
- OEM No.
- 4638433
- Replacement No.
- ZX870CR
- Application
- Excavator / Earthmoving / Construction
Trade Specifications
- Reference Price
- USD $180.00 - $380.00
- Minimum Order Quantity
- 1 Pieces
- Lead Time
- in stock
- Supply Ability
- 10,000 Pieces
- Shipping Port
- Xiamen, China
Quanzhou Hongshan Construction Machinery Co., Ltd.
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- Location
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- Main Products
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- Employees
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- Factory Area
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- Annual Revenue
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- Main Markets
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