Brand New D8R Bulldozer Hydraulic Pump 139-4151 | CAT Replacement | Main Pump Assembly

Brand New 139-4151 Hydraulic Pump Assembly for CAT D8R Bulldozer

Product Overview: The 139-4151 Hydraulic Pump Assembly is the high-performance power core of the Caterpillar D8R Bulldozer’s hydraulic system. Specifically engineered to meet the extreme load demands of heavy-duty dozing, this brand-new variable displacement piston pump provides precise and powerful hydraulic flow for implements (blade, ripper) and steering systems. As a premium replacement for the original CAT 139-4151, this assembly is manufactured strictly to OEM standards, ensuring seamless compatibility and “plug-and-play” convenience for the D8R model.

Key Technical Advantages:

• Advanced Variable Control Logic: Features high-precision compensation technology that automatically adjusts displacement based on working resistance. It delivers high torque under heavy loads and minimizes power consumption under light loads, significantly improving overall fuel efficiency.

• Reinforced Heavy-Duty Construction: Built for the frequent pressure spikes and vibrations inherent in dozing operations. The pump features high-strength cast-iron housing and reinforced rotating groups for superior structural integrity under continuous high pressure.

• Extreme Durability: Internal bearings and seals are selected from wear-resistant, high-temperature materials, drastically extending service intervals and reducing costly downtime.

• OEM-Level Fitment: Mounting patterns, shaft specifications, and porting arrangements are identical to CAT 139-4151, requiring no mechanical modifications for a fast and secure installation.

• Target Applications: Exclusively designed for the Caterpillar D8R series bulldozers used in earthmoving, mining stripping, and heavy-duty leveling operations.

Detailed Models & Parameters:

• Compatible Equipment: Caterpillar (CAT) D8R Bulldozer.

• Core Part Number: 139-4151 / 1394151.

• Product Category: Axial Piston Variable Displacement Pump.

• Technical Specs:

  • Rated Pressure: Fully compatible with D8R system pressure requirements (Standard 40 MPa class).

  • Mounting: Standard flange mounting for direct engine integration.

• Condition: 100% Brand New, fully pressure-tested across all duty cycles before shipment.