FRR074 Danfoss Axial Piston Pump 310 Bar

Product Overview

The FRR074 (Specific model code: FR-R-074B-LS-26-18-NN-N-3-S1B2-A1N-NNN-NNN-NNN and its derivatives) is a high-performance axial piston variable displacement pump engineered specifically for open-circuit hydraulic systems. Serving as a flawless OEM replacement for the Danfoss Series 45 Frame F pumps, this product achieves 100% in-situ interchangeability concerning overall dimensions, SAE C mounting flange, and hydraulic port specifications. Adhering to our rigorous manufacturing standards, every single unit must pass a 100% full-load simulated working condition test before leaving our facility. This guarantees superior volumetric efficiency and an extended service life under extreme conditions, providing a highly cost-effective and stable power source for your heavy-duty mobile machinery and industrial applications.

Technical Specifications

• Model: FRR074 / FR-R-074B-LS-26-18-NN-N-3-S1B2-A1N…

• Nominal Displacement: 74 cm³/rev (4.52 in³/rev)

• Continuous Working Pressure: 310 bar (4,500 psi)

• Maximum Peak Pressure: 400 bar (5,800 psi)

• Maximum Input Speed: 2,800 rpm (Continuous working speed: 2,400 rpm)

• Control Method: LS (Load Sensing) control with integrated pressure compensator (e.g., Code 26-18: PC set at 260 bar, LS differential at 18 bar)

• Direction of Rotation: R (Right-hand / Clockwise, viewed from shaft end)

• Mounting Flange & Shaft: Standard SAE C specification [cite: 3.2.2]

• Weight: Approx. 29.5 kg (65.0 lbs) for standard axial port configuration [cite: 3.2.1]

Key Technical Advantages

• 100% In-Situ Interchangeability: Designed with a standard SAE C mounting flange, splined shaft, and identical port layouts, allowing you to directly replace the original Danfoss Series 45 F frame pump. This true “plug-and-play” capability eliminates the need to alter any existing piping or mechanical interfaces, significantly reducing costly machine downtime.

• Precision-Machined Rotary Group: The cylinder block and valve plate are constructed from high-strength bronze alloy and specially heat-treated steel. Refined through an ultra-precision lapping process, these components maintain an optimal hydrodynamic oil film, preserving a volumetric efficiency of over 95% even at continuous 310 bar operations, fully preventing internal leakage and overheating.

• Energy-Efficient LS Control System: Equipped with a highly responsive Load Sensing (LS) control valve, the pump intelligently adjusts its output flow and pressure based on the real-time load requirements of the actuators. This closed-loop regulation minimizes energy loss during standby and relief phases, generating up to 30% more energy savings compared to fixed-displacement pump systems.

• Low-Noise Swashplate & Heavy-Duty Bearings: Fitted with top-tier international brand tapered roller bearings capable of withstanding extreme radial and axial loads. The optimized swashplate structure and precision-engineered relief grooves on the valve plate significantly minimize fluid pulsation, resulting in remarkably lower high-frequency operational noise.

• 100% Factory Simulated Load Testing: We absolutely reject random sampling. Upon assembly, every single FRR074 pump is mounted onto a simulation test bench to undergo a series of rigorous tests—including pressure shock, speed limits, and flow step-response. We ensure the specifications are not just numbers on a datasheet, but reliable performance delivered directly to your machinery.

Application Areas

Thanks to its compact footprint and exceptional power density, this series of high-pressure piston pumps is widely utilized in various mobile and heavy-duty industrial equipment:

• Construction Machinery: Main and auxiliary hydraulic circuits in excavators, wheel loaders, motor graders, and rotary drilling rigs.

• Agricultural Equipment: Hydraulic drive and steering systems in high-horsepower tractors, combine harvesters, and large sprayers.

• Forestry Equipment: Lifting and heavy-duty grapple control systems in feller bunchers and skidders.

• Material Handling: Smooth lifting and extension mechanisms in heavy-duty forklifts, reach stackers, and aerial work platforms.

Expert Maintenance Tips

• Initial Start-up & Bleeding: Prior to the initial start-up, the pump casing must be completely filled with filtered, clean hydraulic fluid through the highest case drain port. Failure to do so will result in dry friction and instantaneous failure of the slipper pads and valve plate.

• Case Drain Pressure Management: The drain line must be routed directly to the reservoir without restrictions, terminating below the minimum fluid level. The pressure inside the pump casing must not exceed the suction port pressure by more than 2 bar (29 psi). Excessive case back-pressure will directly cause the shaft seal to blow out.

• Fluid Cleanliness Control: It is strongly recommended to maintain system fluid cleanliness at or above ISO 4406 class 20/18/15. Avoid installing high-resistance suction strainers at the pump inlet to prevent cavitation at high speeds, which induces abnormal vibration and premature wear.