EATON 003920-031 HYDRAULIC PUMP

The Eaton 003920-031 Hydraulic Pump is a genuine piston pump built as part of Eaton’s mobile and industrial hydraulic pump range, designed to deliver consistent flow and pressure across demanding off-highway and construction equipment applications. As the primary hydraulic power source in the system, this pump converts mechanical input from the engine or power take-off into pressurized hydraulic flow that drives cylinders, motors, and other actuators throughout the machine.

Eaton’s piston pump platforms are engineered around a rotating group design that maintains close internal tolerances between the pistons, cylinder block, and valve plate, allowing the pump to hold volumetric efficiency even under variable load and speed conditions. This design is built to withstand continuous duty cycles, resist wear from constant pressure fluctuation, and maintain stable output over long service intervals — qualities that matter most in equipment that runs for extended hours without downtime for hydraulic maintenance.

Fitting a genuine Eaton pump rather than a generic replacement ensures the internal tolerances, port configuration, and mounting dimensions match exactly what the original hydraulic circuit was designed around. This matters significantly on piston pumps, where even small deviations in internal clearances can lead to reduced efficiency, increased heat generation, or premature wear on the rotating group. Replacing a worn or failing pump with the correct OEM unit helps restore full hydraulic system performance and protects downstream components like valves and cylinders from the effects of inconsistent flow or pressure.

Technical Features

• Genuine Eaton-spec hydraulic piston pump
• Precision-machined rotating group for consistent volumetric efficiency
• Built to withstand continuous-duty pressure and load cycling
• Maintains stable flow output across variable operating speeds
• Designed for direct OEM fitment — correct port and mounting configuration
• Suited to mobile, construction, and industrial hydraulic drive systems

Compatible Application

• Eaton piston pump platform for mobile and industrial hydraulic circuits (confirm exact machine/model fitment with your equipment’s serial number before ordering)

Alternative Part Numbers

• Atlas Copco 326-9120-007 Hydraulic Pump
• Case D53690 Hydraulic Pump
• Caterpillar 3G-3302 Hydraulic Pump

Shop & Supply stocks the Eaton 003920-031 Hydraulic Pump for immediate dispatch, alongside a broad lineup of genuine hydraulic pumps from Eaton, Atlas Copco, Case, and Caterpillar. Choosing the original part means the exact internal tolerances and mounting specifications your equipment was built around — reliable hydraulic performance without the guesswork of an unverified aftermarket substitute.