Danfoss JRLS51 Hydraulic Plunger Pump for Excavators Cranes Industrial Machinery

Product Overview:
The JRLS51 is a high-performance variable displacement axial piston pump from the renowned Danfoss (Sauer-Danfoss) 45 Series . Designed for open circuit hydraulic systems, this pump delivers exceptional power density, reliable operation, and precise control under demanding conditions. With a displacement of 51 cm³/rev and advanced LS (Load Sensing) control, it provides stepless flow adjustment matched exactly to system demands, significantly reducing energy consumption and heat generation . This unit is a direct, high-quality replacement solution for original Danfoss equipment.

Technical Specifications:

• Model: JRLS51 (e.g., JRLS51BLS2320NNN3S1NEA2NNNNJJJNNN, JRLS51BLS2115NNN3C2NEA8NNNNJJJNNN)

• Type: Swashplate design, variable axial piston pump

• Series: 45 Series / JRL Frame

• Displacement: 51 cm³/rev

• Nominal Pressure: 230-280 bar (continuous operation)

• Maximum Pressure: 310-450 bar (peak, depending on configuration)

• Maximum Speed: 2700 rpm (continuous)

• Control Type: LS - Load Sensing with Pressure Compensator (Factory setting: PC 230 bar, LS Stand-By 20 bar)

• Design: For open circuit hydraulic systems

• Mounting Flange: SAE-C 4-Bolt

• Port Position: Radial

• Rotation: Left hand - Counter-clockwise (view on drive shaft)

• Shaft Style: Splined Shaft ANSI B92.1 (t14 12/24dp)

• Auxiliary Mount: Without (standard configuration)

• Weight: Approximately 30-35 kg

• Material: Robust cast iron construction

• Temperature Range: -20°C to +80°C (optional high-temperature seals available)

Core Features:

• Robust Swashplate Design: The proven swashplate design with high-strength cast iron construction ensures reliable operation, excellent volumetric efficiency, and long service life in open circuit applications .

• LS (Load Sensing) Control: Advanced load sensing control automatically adjusts pump displacement based on system demand, providing precise flow matching to reduce energy consumption and heat generation while maintaining optimal pressure .

• High-Pressure Capability: Delivers up to 310-450 bar system pressure (depending on configuration), meeting the most demanding mobile and industrial application requirements .

• High Efficiency: Optimized piston and slipper design minimizes internal leakage and delivers high volumetric efficiency, reducing energy loss .

• Low Noise Operation: Advanced noise reduction technology ensures smooth, quiet operation, making it suitable for noise-sensitive environments .

• Modular Design: Supports integration with multiple valve groups (pressure cutoff, load sensing control) to adapt to different system requirements .

• SAE Standard Mounting: SAE-C 4-bolt mounting flange and radial port positions ensure compatibility with industry-standard hydraulic systems .

• Durability: Designed for continuous operation in demanding environments, with robust bearing systems ensuring long service life .

Main Applications (Suitable Equipment):
The JRLS51 is widely recognized as a versatile and reliable hydraulic power unit for medium-duty applications requiring energy-efficient control. It is extensively used in:

1. Excavators & Construction Machinery:

• Main hydraulic pump for compact excavators and mini excavators

• Backhoe loaders and compact loaders

• Wheel loaders and skid steer loaders

• Cranes and lifting equipment 

2. Industrial Machinery:

• Injection molding machines - main or auxiliary functions

• Machine tools - hydraulic feed and clamping systems

• Hydraulic presses and forming equipment

• General industrial hydraulic power units 

3. Material Handling Equipment:

• Forklifts and telehandlers

• Aerial work platforms and scissor lifts

• Conveyor systems and material handling equipment 

4. Marine & Offshore Applications:

• Ship deck machinery and winches

• Marine cranes and steering gear

• Offshore equipment and port machinery 

5. Agricultural Machinery:

• Tractors - auxiliary hydraulic functions

• Harvesters and agricultural implements

• Sprayers and fertilizer applicators

6. Specialty Applications:

• Paper industry machinery - consistent fluid power for production processes 

• Mining equipment and rock drills

• Municipal vehicles and sweepers