109-4197 Caterpillar Hydraulic Piston Pump 350 Bar

Product Overview

The 109-4197 axial piston variable displacement hydraulic pump (interchangeable with CAT Reman part number 0R-7472 / 0R7472) is precision-engineered for the steering and implement hydraulic systems of heavy-duty Caterpillar Wheel Dozers and Loaders. Built strictly to Caterpillar OEM engineering standards, this pump offers a 100% direct drop-in replacement for Caterpillar 844, 990, and 990 II equipment. Every pump undergoes 100% factory bench testing under simulated full-load and high-pressure conditions to ensure maximum volumetric efficiency, superior temperature control, and long service life in demanding earthmoving and mining applications.

Technical Specifications

• Part Number: 109-4197 (CAT Reman Part No.: 0R-7472)

• Compatible Equipment: Caterpillar 844, 990, 990 II Wheel Dozers / Loaders

• Pump Type: Swashplate Axial Piston Variable Displacement Pump

• Nominal Displacement: Approx. 115 cm³/rev

• Rated Operating Pressure: 31.0 MPa (310 bar / 4500 psi)

• Peak Operating Pressure: 35.0 MPa (350 bar / 5075 psi)

• Maximum Speed: 2100 rpm

• Control Type: Load Sensing with Pressure Cut-off

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

• Net Weight: Approx. 58 kg

Key Technical Advantages

• 100% Direct Drop-in Interchangeability: Precision-machined mounting flanges, drive shaft splines, and hydraulic ports strictly conform to CAT original specifications, ensuring plug-and-play installation without pipeline modification.

• Premium Tribological Components: Manufactured with high-strength forged steel cylinder blocks and precision-lapped bimetallic valve plates, offering superior resistance to galling and high volumetric efficiency under peak working pressures.

• Heavy-Duty Bearing Arrangement: Fitted with high-capacity tapered roller bearings engineered to absorb severe radial and axial shock loads during high-load pushing and dozing operations.

• Low Noise & Rapid Control Response: Optimized timing groove geometry minimizes pressure ripples and operational noise, while the load-sensing mechanism delivers instant hydraulic flow for smooth blade and steering responsiveness.

Application Areas

• Mining & Heavy Earthmoving Equipment: Primary hydraulic power source for implement and steering systems on Caterpillar 844, 990, and 990 II wheel dozers and loaders.

• Surface Mining Operations: Heavy-duty hydraulic power unit for rugged off-highway machinery sharing equivalent Caterpillar hydraulic platforms.

Expert Maintenance Tips

• Case Priming Prior to Startup: Fill the pump casing completely with clean hydraulic fluid through the highest drain port before starting the engine for the first time. Never operate the pump dry to avoid catastrophic damage.

• System Flushing: Flush the main hydraulic circuit and clean the oil reservoir thoroughly prior to installation, ensuring fluid cleanliness meets ISO 4406 18/16/13 or cleaner.

• Simultaneous Filter Replacement: Always replace all hydraulic suction and return filters simultaneously during pump installation to prevent pre-existing contaminants from damaging the new pump.