42L28DE1A603C2A2FNB3030BNNNNNNNN Danfoss Axial Piston Pump | 415 Bar

Product Overview

The 42L28DE1A603C2A2FNB3030BNNNNNNNN is a 28 cm³/rev displacement model from the Danfoss (formerly Sauer Danfoss) Series 42 closed-circuit axial piston variable pump family. Series 42 pumps utilize a parallel axial piston slipper concept in conjunction with a tiltable swashplate to vary displacement, providing an infinitely variable speed range between zero and maximum in both forward and reverse directions. The series is designed for medium power hydrostatic transmission applications, with displacements ranging from 28 cm³ to 51 cm³.

The model code breaks down as follows: 42L28 identifies the Series 42 pump with 28 cm³/rev displacement, L denoting counterclockwise (CCW) rotation; DE1A is the control type and regulator configuration code; 603 is the port and mounting configuration code; C2A2 is the control option and shaft configuration code; FNB3030B is the flange, port and additional option combination; NNNNNNNN is the standard option combination.

Series 42 pumps feature the shortest axial length among comparable pumps in their class, simplifying integration into machines with limited mounting space. Stepless swashplate adjustment in both directions from neutral provides smooth flow reversal without additional valve fittings.

Every 42L28 unit undergoes 100% simulated operating-condition bench testing prior to shipment, covering pressure cycling, displacement response and thermal shock. Mounting flange, shaft end and port dimensions comply with SAE standards and are identical to the original Danfoss 42L28, ensuring true drop-in interchangeability with zero modification required.

Technical Specifications

Series 42 Frame Size Specifications:

• 42L28 (This Model): Displacement 28 cm³/rev (1.71 in³/rev), weight 34.5 kg (76 lbs), mass moment of inertia 0.0018 kg·m², rated speed 3,400 rpm, max speed 3,750 rpm, min speed 500 rpm

• 42L32: Displacement 31.8 cm³/rev (1.94 in³/rev), weight 34.5 kg (76 lbs), mass moment of inertia 0.0019 kg·m²

• 42L41: Displacement 40.9 cm³/rev (2.50 in³/rev), weight 42 kg (92 lbs), mass moment of inertia 0.0036 kg·m², rated speed 3,200 rpm, max speed 3,600 rpm, min speed 500 rpm

• 42L51: Displacement 51 cm³/rev (3.11 in³/rev), weight 42 kg (92 lbs), mass moment of inertia 0.0038 kg·m², rated speed 2,900 rpm, max speed 3,400 rpm, min speed 500 rpm

42L28DE1A603C2A2FNB3030BNNNNNNNN Additional Specifications:

• Model Code: 42L28DE1A603C2A2FNB3030BNNNNNNNN

• Pump Type: In-line axial piston, positive displacement variable pump including cradle swashplate and servo control

• Displacement: 28 cm³/rev (1.71 in³/rev)

• Rated Pressure: 385 bar (5,584 psi)

• Peak Pressure (Intermittent): 415 bar (6,019 psi)

• Minimum Speed: 500 rpm

• Rated Speed at Max Displacement: 3,400 rpm

• Maximum Speed at Max Displacement: 3,750 rpm

• System Pressure Regulation Range: 140–415 bar (2,030–6,017 psi)

• Case Pressure Rated: 3.4 bar (50 psi)

• Max Case Pressure (Cold Start): 10.5 bar (150 psi)

• Rotation: Counterclockwise (L)

• Mounting Flange: SAE B flange (SAE J744 standard)

• Port Connections: SAE twin ports, radial

• Input Shaft Options: Splined, round straight key

• Auxiliary Mounting Pad: SAE A (9 tooth and 11 tooth) / SAE B (13 tooth and 15 tooth)

• Control Options: MDC (Mechanical), EDC (Electric), NFPH (Non-Feedback Proportional Hydraulic), NFPE (Non-Feedback Proportional Electric), FNR (Forward-Neutral-Reverse)

• Filtration Configuration: Suction or charge pressure filtration

• Loop Flushing: Optional

• Weight: ~34.5 kg (76 lbs)

• Circuit Type: Closed circuit

Key Technical Advantages

1. Cradle Swashplate Design for Infinitely Variable Displacement and Smooth Reversal

The 42L28 employs a parallel axial piston slipper concept with a tiltable swashplate, with displacement infinitely variable from zero to maximum via servo control. Stepless swashplate adjustment in both directions from neutral provides smooth flow reversal without additional valve fittings, simplifying system design and improving response speed. This makes the 42L28 particularly suitable for travel drive systems requiring frequent direction changes and precise speed control.

2. High Pressure Capability — 415 Bar Peak Pressure

The 42L28’s 28/41 cm³ frame size supports maximum working pressures up to 415 bar (rated pressure 385 bar), delivering excellent power density in medium-power hydrostatic transmission applications. The system pressure regulation range of 140–415 bar allows flexible setting according to application requirements.

3. Compact Construction and High Power Density

Series 42 pumps feature the shortest axial length among comparable pumps in their class, with optimized overall length and power density for integration into space-constrained equipment designs. The 28 cm³ frame size weighs only 34.5 kg with a mass moment of inertia of just 0.0018 kg·m², helping reduce system inertia and improve dynamic response.

4. Versatile Control Options and Flexible Adaptation

Series 42 offers multiple servo control options including mechanical (MDC), electric proportional (EDC, NFPE), hydraulic proportional (NFPH) and three-position electric (FNR) controls, enabling flexible adaptation to various transmission control schemes. This model is configured with the DE1A control type, supporting precise on-line displacement modulation.

5. 100% Simulated Load Testing & Drop-In Interchangeability

Each 42L28 unit is bench-tested under simulated operating conditions prior to dispatch, covering pressure cycling, displacement response and thermal variation. Mounting flange, shaft end and port dimensions comply with SAE standards, matching the original Danfoss 42L28 exactly, enabling direct replacement without any interface modification.

Application Areas

Series 42 pumps are OEM-installed on Bobcat, Gehl, Mustang, New Holland, Case, Manitou and JCB machinery platforms, deployed across the following applications:

• Skid Steer Loaders: Bobcat S220/S250/S300, A220/A300, T250/T300; Gehl SL4625/SL5625/V270; Mustang 2042/2054; New Holland L218/L220/L225; Case SR175/SR200/SV185; JCB Robot 160/170/190

• Telescopic Handlers: Manitou MLT/MRT series

• Agriculture: reverse-PTO drivetrains in narrow-orchard tractors, combine harvester hydrostatic travel drives

• Construction: rollers/compactors, asphalt pavers, trenchers

• Municipal: street sweepers, snow removal vehicle drives

• Drilling: drilling rig drive systems

• Material Handling: cranes, material handling equipment

Expert Maintenance Tips

1. Installation Position and Housing Priming: Pump installation is recommended with the control at the top or side; consult Danfoss for non-conformance guidelines. The housing must always be filled with hydraulic fluid; fill with clean hydraulic oil before first startup.

2. Oil Cleanliness and Filtration Configuration: Maintain system oil cleanliness at ISO 4406 18/16/13 or better. Series 42 pumps support suction or charge pressure filtration—select the appropriate filtration scheme per system design. Replace hydraulic oil and filter after the first 500 hours, then follow a 2,000-hour or annual replacement cycle.

3. System Pressure Regulation: System pressure regulation range is 140–415 bar. Set pressure values according to actual machine hydraulic system requirements to avoid unnecessary energy loss and component wear from excessive pressure settings. Use a calibrated pressure gauge when adjusting the pressure limiter, gradually adjusting to the target value.

4. Auxiliary System Configuration: Closed-circuit systems require an independent braking system, suitable reservoir and heat exchanger. If equipped with a loop flushing valve, periodically inspect its operating condition—inspect flushing flow and pressure settings every 1,000 hours.

5. Drain Line Management: The drain port must return to the reservoir independently—housing back pressure must not exceed 3.4 bar (rated) and 10.5 bar during cold start. The drain line end must remain submerged to prevent air ingestion. After extended shutdown, fill the housing with clean hydraulic oil before restarting.

6. Periodic Swashplate Mechanism Inspection: Inspect cradle bearing clearance and servo control response characteristics every 2,000 hours. Sluggish displacement response or abnormal noise requires immediate shutdown and service. Use original specification parts when replacing cradle bearing sets to ensure fit accuracy.