1694883 Main Hydraulic Pump for Caterpillar 140H 120H Grader

Product Overview

The 1694883 main hydraulic pump (interchangeable with CAT part numbers 169-4883 and remanufactured code 10R-3875 / 10R3875) is precision-engineered for heavy-duty Caterpillar motor graders and wheel loaders. Built strictly to Caterpillar OEM technical standards, this high-performance pump guarantees a 100% drop-in fit for CAT 120H, 12H, 135H, 140H, 143H, 160H, and 163H motor graders. Serving as the heart of the implement hydraulic system, every unit undergoes rigorous 100% simulated full-load factory bench testing to ensure exceptional volumetric efficiency, smooth hydraulic responsiveness, and long-term durability in tough earthmoving environments.

Technical Specifications

• Part Number: 1694883 / 169-4883 (Reman Part No.: 10R-3875 / 10R3875)

• Compatible Equipment: Caterpillar 120H, 12H, 135H, 140H, 143H, 160H, 163H Motor Graders

• Pump Type: Axial Piston Variable Displacement Main Pump

• Nominal Displacement: Approx. 75 cm³/rev

• Rated Operating Pressure: 25.0 MPa (250 bar / 3625 psi)

• Peak Operating Pressure: 28.0 MPa (280 bar / 4060 psi)

• Maximum Speed: 2200 rpm

• Control Type: Pressure & Flow Compensator (Load Sensing)

• Rotation Direction: Clockwise (CW, viewed from shaft end)

• Net Weight: Approx. 38 kg

Key Technical Advantages

• 100% Direct Drop-in Interchangeability: Precision-machined mounting flanges, shaft splines, and port connections strictly match CAT OEM specifications, ensuring plug-and-play installation with zero pipeline modification.

• Premium Tribological Components: High-grade alloy steel cylinder blocks paired with specialized bimetallic valve plates are precision-lapped to minimize internal wear and maximize volumetric efficiency under high working pressure.

• Heavy-Duty Bearing Arrangement: Fitted with high-capacity roller bearings designed to absorb extreme radial and axial shock loads typical of grading and leveling operations.

• Low Noise & Rapid Response: Optimized timing groove geometry minimizes pressure ripples and operating noise while providing precise load-sensing responsiveness for accurate blade control.

Application Areas

• Road Construction Equipment: Main implement hydraulic circuit (blade lift, tilt, and steering) for Caterpillar 120H, 140H, and 160H series motor graders.

• Earthmoving & Mining Machinery: Hydraulic power source for heavy CAT motor graders and related mobile machinery sharing the same hydraulic platform.

Expert Maintenance Tips

• System Flushing: Thoroughly flush the main hydraulic system and oil reservoir before installing the new pump to ensure fluid cleanliness meets ISO 4406 18/16/13 or cleaner.

• Case Priming: Fill the pump housing completely with clean hydraulic oil through the highest drain port before initial start-up. Operating the pump dry will cause immediate catastrophic damage.

• Filter Replacement: Always replace all hydraulic intake and return filters simultaneously during installation to prevent contamination from entering the newly installed pump.