Danfoss JRR045 Series Hydraulic Piston Pump | JRRS51 JRR045B | Open Circuit Pump

The JRR045 Series axial piston pumps from Chengyuan Hydraulic are high-efficiency power sources engineered specifically for open-circuit hydraulic systems. Fully compatible with Danfoss technical standards, including complex configurations like JRRS51BLS and JRR045BPC, these units provide 100% original-place interchangeability. Renowned for their robust cast-iron housings, optimized valve plates, and excellent self-priming speeds, the JRR series is a reliable performer. Each pump undergoes 100% simulated condition testing, ensuring superior volumetric efficiency under high-pressure, continuous-duty cycles. It is the premier choice for agriculture, medium-duty mobile equipment, and industrial power units.

Technical Specifications:

• Full Model Codes: JRRS51BLS2520NNN3S1BEA2NNNNJJJNNN / JRR045BPC24NNNNN3-S1B2A2N

• Displacement: $45\text{ cm}^3\text{/rev}$ (JRR045 size) / $51\text{ cm}^3\text{/rev}$ (JRRS51 size)

• Rated Operating Pressure: $210\text{ bar (21 MPa / 3045 psi)}$

• Maximum Pressure: $315\text{ bar (31.5 MPa / 4570 psi)}$

• Max Speed (Self-priming): $2600\text{–}2850\text{ rpm}$

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

• Rotation: R (Clockwise) / L (Counter-clockwise)

• Shaft Specification: S1B (SAE standard splines)

• Weight: Approx. $25\text{ kg}$

Key Technical Advantages:

• High-Rigidity Journal Bearing Design: Featuring a robust one-piece cast iron housing and journal bearings, the pump effectively absorbs radial vibrations. This rigidity ensures perfect alignment between pistons and cylinder blocks at $210\text{ bar}$, significantly extending service life.

• Precision Load Sensing (LS) Control: Models like JRRS51BLS are equipped with sensitive LS valves that dynamically adjust displacement based on load pressure. This minimizes flow loss, reduces system heat generation, and improves fuel/energy efficiency.

• Low Noise Characteristics: Optimized valve plate timing with pre-compression notches smoothens pressure ripples. This allows the pump to maintain noise levels below $75\text{ dB(A)}$ at full speed, meeting modern environmental standards.

• Highly Modular Architecture: The JRR series supports various end-cap and through-drive options. Chengyuan accurately interprets long Danfoss codes to provide precise custom replacements for anything from simple pressure compensation to complex electronic controls.

Application Areas:

• Agricultural Machinery: Tractor hitch systems and combine harvester auxiliary circuits.

• Mobile Equipment: Primary pumps for forklifts and skid-steer loader control systems.

• Industrial Power: Compact hydraulic power units (HPUs) and refuse compactor drives.

Expert Maintenance Tips:

• Case Drain Line: JRR pumps require a dedicated drain line connected directly to the reservoir. Case pressure must stay below $2\text{ bar}$ to prevent shaft seal failure or internal compensator errors.

• Self-Priming Limits: If the suction lift exceeds $0.5\text{m}$ or operating speeds are ultra-high, consider a pressurized inlet to prevent cavitation.

• Startup Procedure: Always fill the pump housing with clean hydraulic fluid through the case drain port before the first run. The slippers and swashplate are sensitive to initial lubrication; a dry start will cause irreversible surface scoring.