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CAT D8N D8R Bulldozer Hydraulic Pump | 421-1808, 139-4151, 6E1661 | Axial Piston Pump
| Model Number | 6E1661, 139-4151, 421-1808, 204-2578 |
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Product Description
CAT D8N & D8R Bulldozer Main Axial Piston Hydraulic Pump Assembly
Product Overview: This series of high-pressure axial piston variable displacement pumps is specifically engineered for Caterpillar (CAT) D8N and D8R heavy-duty bulldozers. Serving as the primary power source for the hydraulic circuit, these pumps drive critical implement functions (blade lift, tilt, and ripper control) and steering systems. We provide core OEM replacements, including part numbers 421-1808, 139-4151, 6E1661, and 204-2578, ensuring your equipment maintains robust load-sensing capabilities in the harshest mining and earthmoving conditions.
Key Technical Advantages:
Superior Heavy-Duty Durability: Optimized for high-intensity dozing operations, featuring reinforced piston groups and precision port plates. It maintains exceptional volumetric efficiency even under sustained high-load and dusty environments.
Precise Load-Sensing Control: Models like the 421-1808 offer highly responsive pressure and flow compensation, instantaneously modulating output based on work demand. This significantly improves fuel efficiency and prevents system overheating.
100% OEM Compatibility: Manufactured strictly to Caterpillar OEM standards. Every mounting flange, shaft spline, and port configuration is a seamless match for 139-4151 and 204-2578, ensuring a direct “drop-in” installation.
Vibration & Shock Resistance: Specifically designed for the severe duty cycles of D8 series dozers. Reinforced bearing structures effectively absorb shock loads from the blade, extending the pump’s Mean Time Between Overhauls (MTBO).
Specific Models & Technical Parameters:
Machine Compatibility: Caterpillar D8N, D8R, D8R LGP, D8R Series II Bulldozers.
Core OEM Part Numbers: 421-1808, 139-4151, 6E1661, 204-2578.
Pump Type: Variable Axial Piston Pump.
Key Specifications: Rated pressure up to 35 MPa (350 Bar); Compliant with SAE mounting standards; Compatible with standard CAT hydraulic fluid cycles.
Company Profile
We adhere to international quality management standards and provide a 1-year warranty including maintenance and replacement. We have established long-term strategic cooperation with many well-known brands and continuously launch new products to meet market development. Flexible payment terms are supported, including USD settlement, Alipay, Western Union and T/T.
Relying on our standardized production base and professional foreign trade team, we provide competitive factory direct prices, efficient logistics channels and punctual delivery. FJZY Hydraulic is devoted to being your trustworthy long-term partner in hydraulic and agricultural machinery fields.
Our Advantages
Fast & Reliable Delivery
Extensive Partnerships
We collaborate with numerous factories, offering a wide range of product selections and providing you with instant quote responses
Strict Quality Assurance
Quality first is our principle. We provide a one-year warranty service, ensuring you receive top-tier quality products with confidence.
Competitive Pricing
Through efficient production and close cooperation, we offer highly competitive prices, guaranteeing a cost-effective experience for you.
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