JRRS Danfoss Pump Original Series 45 Hydraulic Pumps

Wuhan Xinlaifu Hydraulic Equipment Co., Ltd. is one of the leading manufacturers and suppliers of jrrs danfoss pump original series 45 hydraulic pumps in China. With abundant experience, we warmly welcome you to buy high quality customized products at competitive price from our factory. Also, OEM&ODM service is available.

 

 

 

 

Danfoss JRRS Series 45 – J Frame Open Circuit Variable Piston Pump

If you are designing or maintaining mobile equipment where every cubic centimeter of engine bay space counts-a combine harvester with a tightly packed driveline, a self-propelled sprayer with limited mounting real estate, or a telehandler where pump placement competes with other components-you already know that pump size is not a minor specification. It is a design constraint.

The Danfoss JRRS Series belongs to the J Frame of the Series 45 open-circuit axial piston pump family-the most compact frame within the Series 45 lineup. Danfoss engineered the J Frame specifically to deliver the smallest 45 cc package size available on the market, without compromising the pressure capability or reliability that Series 45 pumps are known for.

The JRRS series covers five displacements-45, 51, 60, 65, and 75 cc/rev-with pressure ratings that depend on the model. The JRRS45, JRRS51, and JRRS60 are rated at 310 bar (4,495 psi) continuous with 400 bar (5,800 psi) peak capability. The JRRS65 and JRRS75 deliver 260 bar (3,770 psi) continuous with 350 bar (5,075 psi) peak. Rated speeds range from 2,800 rpm (45 cc) down to 2,400 rpm (75 cc), with theoretical flows from 126 L/min to 180 L/min.

The "R" in JRRS stands for clockwise rotation (CW) as viewed from the shaft end. The corresponding counterclockwise version is the JRLS-identical in every other respect. Both are available with Load Sensing (LS) and Pressure Compensation (PC) control options, making them suitable for a wide range of open-circuit hydraulic applications.

For equipment manufacturers and fleet operators alike, the JRRS represents a high-power-density solution that fits where other pumps simply will not-delivering Series 45 reliability in a package that minimizes installation space requirements.

 

 

 

2.1 Smallest 45 cc Package on the Market – Compactness Without Compromise

The JRRS series is built on the J Frame-the most compact frame in the Series 45 family. Danfoss explicitly engineered this frame to achieve the smallest 45 cc package size available in the market.

What does this mean for your equipment? For a combine harvester manufacturer, a 15% reduction in pump footprint can free up critical space for additional sensors, larger cooling packages, or simpler service access. For a sprayer OEM, a more compact pump allows for tighter integration with the engine PTO, reducing the overall driveline length. The JRRS delivers this space saving without reducing pressure capability-the 45 cc model still delivers 310 bar continuous pressure, matching pumps with significantly larger footprints.

 

2.2 Pressure Rating – 310 Bar Continuous, 400 Bar Peak

The JRRS series offers two pressure tiers depending on the displacement:

Model	Continuous Pressure	Peak Pressure
JRRS45 / JRRS51 / JRRS60	310 bar (4,495 psi)	400 bar (5,800 psi)
JRRS65 / JRRS75	260 bar (3,770 psi)	350 bar (5,075 psi)

For applications like motor grader blade control or backhoe loader digging cycles, the 310 bar continuous rating ensures the pump maintains full flow output even under sustained heavy loads. The 400 bar peak margin handles transient pressure spikes-such as when a loader bucket hits an unexpected obstruction-without bypassing or derating.

 

2.3 Broad Speed Range – Flexibility Across Operating Conditions

The JRRS series operates across a wide speed range from 500 rpm minimum to 2,800 rpm maximum (for the 45 cc model). This broad speed window allows the pump to perform reliably at engine idle-maintaining sufficient flow for pilot controls and auxiliary functions-while delivering full rated flow at working speeds.

The rated speed varies by displacement:

JRRS45: 2,800 rpm

JRRS51: 2,700 rpm

JRRS60: 2,600 rpm

JRRS65: 2,500 rpm

JRRS75: 2,400 rpm

 

2.4 Multiple Control Options – Tailored to Your Application

The JRRS series supports a range of control configurations to match different machine requirements:

Load Sensing (LS) : The pump adjusts displacement to match the flow demand from the control valve-delivering only the flow required for the work being done. This translates to measurable fuel savings in applications with variable load cycles, such as telehandlers and reach stackers.

Pressure Compensation (PC) : The pump maintains a set maximum pressure, destroking when the system reaches that pressure to prevent overloading.

Electronic Torque Limiting (ETL) : Available as an option for applications requiring precise power management.

Fan Drive Control (FDC) : Specifically designed for cooling fan applications.

 

2.5 SAE B and C Mounting Options – Installation Flexibility

The JRRS series offers SAE-B 2-bolt flange as standard across all displacements, with SAE-C 4-bolt flange available for the 51 cc through 75 cc models. This mounting flexibility allows the JRRS to integrate with a wide range of existing driveline configurations-whether you are replacing an older pump on a legacy machine or specifying a new pump for a greenfield design.

The pump also features multiple shaft options, including splined shafts (ANSI B92.1) and straight key configurations, ensuring compatibility with your existing coupling arrangement.

 

2.6 Heavy-Duty Construction – Built for Mobile Equipment Duty Cycles

The JRRS series incorporates tapered roller bearings at both the front and rear of the input shaft, providing robust radial load capacity for belt-driven and direct-coupled applications. The cylinder block contains nine reciprocating pistons with brass slippers connected by ball joints, a design that has proven its durability across millions of operating hours in agricultural and construction equipment.

A single servo piston with a cradle-type swashplate set in polymer-coated journal bearings provides responsive displacement control with minimal hysteresis. The result is a pump that delivers predictable, stable performance across the full range of operating conditions.

Q1: What does "JRRS" stand for?

J = J Frame (the most compact frame in the Series 45 family)
RR = Clockwise rotation (R) with Load Sensing (LS) control
S = Load Sensing / Pressure Compensated control

The corresponding counterclockwise version is JRLS. Versions without load sensing are designated JRR (clockwise) and JRL (counterclockwise).

 

Q2: What is the displacement range of the JRRS series?

The JRRS series covers five displacements: 45, 51, 60, 65, and 75 cc/rev.

 

Q3: What are the pressure ratings for each model?

Model	Continuous Pressure	Peak Pressure
JRRS45 / JRRS51 / JRRS60	310 bar (4,495 psi)	400 bar (5,800 psi)
JRRS65 / JRRS75	260 bar (3,770 psi)	350 bar (5,075 psi)

 

Q4: What is the difference between JRRS and FRR (F Frame)?

Both are Series 45 open circuit pumps, but they serve different applications:

Feature	JRRS (J Frame)	FRR (F Frame)
Frame size	Smallest / most compact	Medium-heavy
Displacement range	45–75 cc/rev	74–90 cc/rev
Target applications	Harvesters, sprayers, telehandlers, graders	Excavators, larger loaders
Mounting flange	SAE B (std), SAE C (optional 51-75)	SAE C

 

Q5: What is the recommended operating speed range?

Minimum stable speed: 500 rpm

Rated speed (varies by displacement):

45 cc: 2,800 rpm

51 cc: 2,700 rpm

60 cc: 2,600 rpm

65 cc: 2,500 rpm

75 cc: 2,400 rpm

 

Q6: What control options are available?

The JRRS series supports multiple control configurations:

Load Sensing (LS) – adjusts flow to match demand

Pressure Compensation (PC) – maintains set maximum pressure

Electronic Torque Limiting (ETL) – for power management

Fan Drive Control (FDC) – for cooling fan applications

 

Q7: Can the JRRS be used in a closed-circuit system?

No. The JRRS series is specifically designed for open-circuit hydraulic systems. In an open circuit, the pump draws oil from a reservoir and returns it to the same reservoir after passing through the actuators.

 

Q8: What mounting flange does the JRRS series use?

Standard: SAE-B 2-bolt flange (all displacements)

Optional: SAE-C 4-bolt flange (51 cc through 75 cc models)

Q9: What shaft options are available?

Common shaft configurations include splined shafts (ANSI B92.1) with various tooth counts and straight key shafts. Please confirm your coupling type at the time of ordering.

1. Product Overview

The JRRS / JRLS series are high-performance axial variable piston pumps for open-circuit hydraulic systems, developed based on Danfoss S45 platform. This product line includes 4 major frame sizes: 45, 51, 60 and 75, widely used in mobile hydraulic fields such as construction machinery, agricultural equipment, mining machinery and petroleum machinery.

Brand: Danfoss (Denmark)

Product Type: Swash-plate axial variable piston pump (Exclusive for open circuit)

Rotation Definition: JRRS = Right-hand rotation; JRLS = Left-hand rotation; The subsequent alphanumeric codes represent displacement, control mode, mounting form, seal type and port configuration[18].

 

2. Model Code Explanation (Universal Rule)

Take JRRS45BLS2020NNN3C2NEA8NNNNJJJNNN as an example for full code definition:

Code Segment	Meaning	Description
JRRS / JRLS	Series & Rotation	JRR = J-series open circuit pump; R = Right rotation; L = Left rotation; S = Standard housing
45/51/60/75	Basic frame size	Define pump frame and standard displacement range
BLS/BPC/CLS etc.	Structure & Control type	LS = Load Sensing; PC = Pressure Compensated; BP/BR = Constant Power; CL = High-flow variant
2020/2520 etc.	Exact displacement	2-digit group for actual displacement (cm³/r) & swash plate stroke
NNN/NNF/NNE	Auxiliary configuration	N = Standard; F = Special port / No charge pump; E = Special seal
3C2/3K4/S1	Pressure class & Control group	C = Standard pressure; K = High pressure; S1 = Proportional electric control
NEA/RFA/BEA	Valve group type	EA = Electric control valve; FA = Flow control valve; HA = Constant pressure valve
8/2/9	Port & shaft size	Corresponding to flange, shaft end and oil port dimensions
NNN/FFF/JJJ	Seal & Accessories	N = NBR standard seal; F = FKM high-temperature seal; J = Standard housing accessories

 

3. General Technical Specifications (Metric & Imperial Units, Official Verified Data)

Parameter	Technical Data	Remarks
Total Displacement Range	25 ~ 147 cm³/r (1.53 ~ 8.97 in³/rev)	Cover full range of small, medium & large displacement[7]
Continuous Rated Pressure	260 ~ 310 bar (3770 ~ 4495 psi)	45/51/60: Max 310 bar; 75: 260 bar for large displacement durability[32]
Peak Intermittent Pressure	400 bar (5800 psi)	All series unified peak pressure for transient shock load[12]
Maximum Permitted Speed	3600 rpm	Normal operating speed: 2100 ~ 3200 rpm; ≤3000 rpm for heavy duty
Volumetric Efficiency	≥ 95%	Optimized valve plate & swash plate design, low pressure loss & high efficiency
Operating Noise	≤ 72 dB(A)	Integrated rigid housing for noise reduction, suitable for mobile quiet operation
Drive Mode	Through-drive shaft	Support multi-pump series connection for multi-actuator hydraulic systems
Hydraulic Fluid	Standard anti-wear hydraulic oil	Viscosity: 16 ~ 68 cSt; Fluid temperature: -20℃ ~ +80℃ (-4℉ ~ +176℉)
Mounting Type	Flange mount (Type A/B/C)	Multiple flanges & spline shafts compatible with mainstream mobile machinery
Seal Material	Standard NBR / Optional FKM	NBR (NNN): General ambient; FKM (FFF): High temperature & corrosion resistance

 

4. Sub-series Detailed Specifications

(1) JRRS45 / JRLS45 (Basic Main Model)

Displacement range: 25 ~ 45 cm³/r

Rated pressure: 310 bar (High-pressure version) / 260 bar (Standard version)

Application: Mini excavators, loaders, sanitation vehicles, small agricultural machinery

Control options: Full coverage of Load Sensing, Pressure Compensated, Constant Power & Mechanical control[16]

(2) JRRS51 / JRLS51 (Medium Displacement Advanced Model)

Displacement range: 45 ~ 51 cm³/r

Rated pressure: 300 bar, Peak 400 bar

Optimization: Integrated Gerotor charge pump to improve low-pressure suction performance

Application: Medium construction machinery, concrete equipment, marine auxiliary hydraulic systems[22]

(3) JRRS60 / JRLS60 (Medium-large Displacement Model)

Displacement range: 51 ~ 60 cm³/r

Rated pressure: 310 bar, enhanced heavy-load stability

Special feature: T0 class low-temperature start & multi-gear flow regulation

Application: Concrete pump trucks, road rollers, mining tunneling equipment

(4) JRRS75 / JRLS75 (Large Displacement Model)

Displacement range: 60 ~ 75 cm³/r

Rated pressure: 260 bar (Derated design for longer service life under large flow)

Extended function: JEA/TEA special electric valves for remote proportional control

Application: Large loaders, pavers, industrial hydraulic stations, petroleum machinery[32]

 

5. Control Modes (Cover all models in the document)

Load Sensing (LS): Mainstream configuration, energy-saving by on-demand flow output (Suffix: BLS series);

Pressure Compensated (PC): Constant pressure output for voltage-stabilized systems (Suffix: BPC/CPC series);

Constant Power (BP/BRP): Torque limiting protection to prevent engine overload (Suffix: BBP/BRP series);

Electric Proportional Control (S1/K4): Stepless electric regulation for flow/pressure, dedicated for automatic systems (Code: 3S1/3K4);

Unloading Control (ZA): No-load unloading to reduce standby energy consumption (Code: NZA).

 

6. Product Advantages & Typical Applications

Core Advantages: Modular structure with high part interchangeability; Heavy-duty tapered roller bearings for long service life; Gasket-free design for low internal leakage; Support 24/7 continuous heavy-duty operation[34].

Typical Applications: Construction machinery, agricultural machinery, mining equipment, marine hydraulics, petroleum equipment, mobile hydraulic power units.

 

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