ERR100B ERR130B Danfoss S45 Axial Piston Pump 310 bar

Product Overview

The ERR100B and ERR130B are the 100 cc-class and 130 cc-class core models within the Danfoss (formerly Sauer Danfoss) Series 45 (S45) family of open-circuit axial piston variable displacement pumps. The Series 45 platform spans displacements from 25 to 147 cm³/rev, with continuous working pressures up to 310 bar and maximum speeds up to 3600 rpm, designed for open-circuit mobile and industrial hydraulic applications.

The Series 45 platform is Danfoss’s flagship product family in the mobile hydraulics segment, widely deployed in construction machinery, agricultural equipment, material handling equipment, and industrial hydraulic systems. The series is renowned for its compact lightweight design, flexible integrated control options, and excellent power density, with extensive field-proven applications in wheel loaders, forklifts, excavators, and telehandlers.

Model Code Breakdown (using ERR100BLS2620NNN3S1NPA1NAAANNNNNN as example):

• ERR: Danfoss Series 45 open-circuit axial piston variable pump, right-hand rotation (CW viewed from shaft end)

• 100B / 130B: Nominal size, geometric displacements of 100 cm³/rev and 130 cm³/rev

• LS: Load Sensing control — automatically adjusts pump displacement by sensing the pressure differential (Δp) across a throttle valve, delivering flow on demand

• 26 / 28: Maximum pressure setting code

• 20 / 25: Load-sensing differential pressure setting code

• NNN: Control variant and additional function codes

• 3: Design series number

• S1NPA1 / S1CPA1: Shaft, port, and mounting configuration codes

Key Configuration of ERR100BLS2620NNN3 (per Hainzl technical data): SAE-C 4-hole mounting flange, 310 bar operating pressure, clockwise rotation, 2450 rpm, 100 ccm displacement, radial ports, mechanical stroke limitation, load-sensing control (pressure and flow controller), ANSI B92.1 splined shaft (z14 12/24dp), factory setting DA 260 bar, LS stand-by 20 bar.

Configuration of ERR130BLS2825NNN3S1CPA1: Per product technical documentation, this model has 130 cm³/rev displacement, nominal pressure 280 bar, peak pressure 350 bar, with S1CPA1 shaft and port configuration.

Drop-in Replacement Advantage: Manufactured to exact Danfoss OEM specifications, these pumps achieve complete drop-in interchangeability with the original Series 45 for SAE-C 4-hole mounting flange, splined shaft (ANSI B92.1), port layout, and load-sensing control interface. Every pump undergoes 100% simulated load testing prior to shipment, validating load-sensing response, volumetric efficiency, and thermal stability under conditions replicating real-world duty cycles.

Technical Specifications 

ERR100B Series General Specifications:

• Series: Danfoss Series 45 (Open Circuit, Swashplate Design)

• Nominal Size: E100B

• Geometric Displacement: 100 cm³/rev (6.1 in³/rev)

• Continuous Working Pressure: 310 bar (4495 psi)

• Peak Pressure: 400 bar (5800 psi)

• Continuous Maximum Speed: 2450 rpm

• Maximum Speed: 2880 rpm

• Minimum Speed: 500 rpm

• Theoretical Flow at Rated Speed: 245 L/min (64.7 GPM)

• Mounting Flange: SAE-C 4-bolt

• Shaft: ANSI B92.1 splined shaft (z14 12/24dp)

• Port Position: Radial ports

• Control Type: Load Sensing (LS), with pressure compensator and electric control options available

• Housing Material: Cast Iron

• Weight: Approx. 52 kg

ERR130B Series General Specifications:

• Series: Danfoss Series 45 (Open Circuit, Swashplate Design)

• Nominal Size: E130B

• Geometric Displacement: 130 cm³/rev (7.93 in³/rev)

• Continuous Working Pressure: 310 bar (4495 psi)

• Peak Pressure: 400 bar (5800 psi)

• Continuous Maximum Speed: 2200 rpm

• Maximum Speed: 2600 rpm

• Minimum Speed: 500 rpm

• Theoretical Flow at Rated Speed: 286 L/min (75.5 GPM)

• Mounting Flange: SAE-C 4-bolt

• Shaft: ANSI B92.1 splined shaft

• Port Position: Radial ports

• Control Type: Load Sensing (LS), with pressure compensator and electric control options available

• Housing Material: Cast Iron

• Weight: Approx. 55 kg

Series 45 Displacement Size Reference:

• E100B: 100 cm³/rev, continuous pressure 310 bar, max speed 2880 rpm

• E130B: 130 cm³/rev, continuous pressure 310 bar, max speed 2600 rpm

• E147C: 147 cm³/rev, continuous pressure 260 bar, max speed 2475 rpm

Key Technical Advantages

1. Load Sensing Control with On-Demand Flow
The Series 45’s core control method is load sensing (LS). The LS controller senses the pressure differential (Δp) across a throttle valve installed in the user line and automatically adjusts pump displacement to maintain constant throttle pressure drop, delivering precise flow on demand. Compared to fixed-displacement pumps or simple pressure-compensated systems, LS control dramatically reduces throttling losses and system heat generation, delivering significant energy savings under variable load conditions. The system delivers only the flow actually required by the actuators, avoiding excess flow being converted to heat through the relief valve.

2. High Power Density with Compact Lightweight Design
The Series 45 is renowned for its compact lightweight design, particularly suitable for space-constrained mobile equipment. The ERR100B achieves a displacement of 100 cm³/rev with a mass of only approximately 52 kg; the ERR130B achieves 130 cm³/rev with a mass of approximately 55 kg, leading its displacement class in power density. The compact axial dimensions make the Series 45 particularly suitable for wheel loaders, forklifts, and other mobile hydraulic applications with strict installation space requirements.

3. SAE-C 4-Bolt Mounting Flange with Standardized Interfaces
The entire Series 45 range uses the SAE-C 4-bolt mounting flange, with mounting dimensions per SAE J744 standard. The shaft is an ANSI B92.1 standard splined shaft (z14 12/24dp), identical to the original Danfoss Series 45 pump. The standardized mounting interface and port layout (radial ports) require no adaptation for replacement, significantly reducing equipment downtime.

4. Cast-Iron Housing with Wide Temperature Adaptability
The pump body is precision-cast from high-strength cast iron, with the material’s damping characteristics effectively suppressing structural vibration and fluid-borne noise. The wide operating temperature range accommodates extreme ambient temperatures from -30°C to +110°C, particularly suitable for mobile hydraulic equipment operating outdoors and in harsh conditions. Cast iron’s lower thermal expansion coefficient helps maintain stable clearances in internal running pairs, extending service life.

5. Flexible Integrated Control Options
The Series 45 supports multiple control options: load sensing (LS), pressure compensating (PC), and electric displacement control (EDC), customizable for different application requirements. The load-sensing control can be configured with different differential pressure settings (e.g., 20 bar or 25 bar) and incorporates a mechanical stroke limitation function for precise maximum displacement setting. Factory pre-set pressures (e.g., DA 260 bar, LS stand-by 20 bar) allow immediate operation upon installation.

Application Areas

• Wheel Loaders: Work equipment hydraulic systems, steering hydraulic circuits

• Forklifts: Lift, tilt, and attachment hydraulic systems

• Excavators: Small to medium excavator hydraulic systems

• Telehandlers: Boom extend and lift hydraulic circuits

• Agricultural Machinery: Tractor hydraulic hitch systems, combine harvester hydraulic drives

• Material Handling: Reach stackers, container forklift hydraulic systems

• Industrial Hydraulic Power Units: Small to medium hydraulic power units, central oil supply systems

Expert Maintenance Tips

1. Hydraulic Fluid Cleanliness
The Series 45 load-sensing control spool operates with extremely tight clearances and is highly sensitive to particulate contamination. System fluid cleanliness must meet ISO 4406 18/15/12 or better. Install a 10 μm absolute-rated filter element at the pump inlet. Replace elements at 500 hours after first commissioning, then every 1,000 operating hours or 6 months, whichever comes first. Contamination control is the primary condition for ensuring long-term stable LS controller operation.

2. Load Sensing Controller Commissioning and Pressure Setting
The ERR100BLS2620NNN3S1NPA1NAAANNNNNN is factory-set at DA 260 bar (pressure compensator setting) and LS stand-by 20 bar. During commissioning, first confirm that the system maximum working pressure is within the 310 bar continuous pressure range. The LS differential pressure setting (20 bar or 25 bar) must be matched to the system throttle valve characteristics to ensure flow control accuracy. Adjustable parameters for the load-sensing control include the pressure compensator setting and LS differential pressure setting. Adjust only with the system at zero load.

3. Case Drain Line Requirements
The case drain line must return directly to the reservoir. Maximum permissible back pressure is 2 bar (0.2 MPa). The drain outlet must terminate below oil level at all times to prevent air ingestion. The drain line diameter must not be smaller than the pump case drain port size. For “drive shaft upwards” installation positions, filling and air bleeding must be performed completely.

4. Pre-Start Priming and Air Bleeding
Before first start, fill the pump housing with clean hydraulic fluid through the case drain port. After installation, turn the drive shaft by hand several revolutions to confirm free rotation without binding. Position the control at neutral (zero displacement) and run at low speed for 5–10 minutes. Verify continuous bubble-free flow from the case drain. Only then apply load.

5. Splined Shaft and Coupling Maintenance
The ERR100B and ERR130B use ANSI B92.1 standard splined shafts (z14 12/24dp). Ensure drive shaft alignment during installation, employing a flexible coupling. Apply appropriate grease to the spline connection to prevent fretting wear. Inspect coupling alignment and spline wear at 500 hours after first commissioning, then recheck every 2,000 operating hours.