KRL045 KRR038 Danfoss Series 45 Piston Pump 260Bar

Product Overview:

The KRL/KRR series open-circuit axial piston pumps—designed as an exact match for the original Danfoss Series 45 K Frame—are core power components engineered specifically for medium-to-high pressure mobile hydraulic systems. We deliver premium hydraulic pump solutions covering complex CCW/CW configurations including KRL045DEJ and KRR038CRP with 100% Drop-in Interchangeability. Supported by our deep expertise in fluid power engineering, every single pump undergoes rigorous 100% simulated operating condition testing prior to shipment. This guarantees absolute reliability under severe loads, vibrations, and harsh environments, significantly reducing equipment downtime and procurement costs.

Technical Specifications:

• Complete Model Codes: KRL045DEJ2120NNA3C2NFA6NAAANNNNNN / KRR038CRP2120NNN3K1RGA6NAAANP00

• Base Series: Danfoss Series 45 Variable Displacement Pump (K Frame)

• Displacement: 45 cm³/rev (KRL045) / 38 cm³/rev (KRR038)

• Rated Operating Pressure: 260 bar (3770 psi) – Continuous

• Maximum Peak Pressure: 310 bar (4500 psi) – Intermittent

• Max Continuous Speed: 2600 RPM

• Control Options: Load Sensing (LS) / Pressure Compensated (PC)

• Rotation: KRL = Left-hand / CCW; KRR = Right-hand / CW

• Shaft & Flange Mounting: Standard SAE B or SAE B-B splined shaft, standard industrial mounting flange

• Approximate Weight: ~22.5 kg

Key Technical Advantages:

• 100% Drop-in Interchangeability: External mounting dimensions, port configurations, and internal rotational groups (cylinder block, pistons, valve plate) are manufactured to strict engineering tolerance standards. They can directly replace original Danfoss pumps without any piping or bracket modifications.

• 100% Simulated Condition Testing: We refuse random sampling. Every KRL045/KRR038 pump undergoes comprehensive test-bench testing across full pressure ranges (0-310 bar), variable speeds, and shock loads to guarantee volumetric efficiency and zero internal leakage.

• High Volumetric Efficiency & Bimetal Valve Plate: Spherical precision lapping between the cylinder block and the wear-resistant bimetal valve plate ensures exceptional volumetric efficiency and reduced noise levels, even under continuous 260 bar high-pressure operation.

• Precision Load Sensing (LS) Control: The integrated LS control valve responds dynamically to load demands, delivering only the flow and pressure required by the system. This cuts non-functional heat generation by up to 30% and enhances vehicle fuel economy.

• Heavy-Duty Tapered Roller Bearings: Main shafts are supported by oversized tapered roller bearings designed to withstand heavy axial and radial forces common in mobile machinery, extending pump lifespan in dust-heavy and high-vibration conditions.

Application Areas:

• Agricultural Machinery: Tractors, combine harvesters, self-propelled sprayers.

• Construction Equipment: Compact excavators, skid steer loaders, wheel loader auxiliary hydraulic systems.

• Material Handling: Telehandlers, aerial work platforms, rough-terrain forklifts.

• Municipal Vehicles: Street sweepers, refuse trucks, compact concrete mixers.

Expert Maintenance Tips:

• Case Filling Before Start-up: Always fill the pump housing with clean hydraulic fluid through the highest drain port prior to initial operation. Dry running must be strictly avoided to prevent instant destruction of the valve plate and piston shoes.

• Fluid Cleanliness Maintenance: Axial piston pumps are highly sensitive to particulate contamination. Maintain system fluid cleanliness to ISO 4406 18/16/13 standards or better, using high-efficiency 10-micron filtration in the return line.

• Case Drain Pressure Limits: Connect the case drain line directly to the reservoir below the fluid level. Ensure continuous case pressure does not exceed 3 bar (43.5 psi); excessive back pressure will ruin the main shaft lip seal.