A Proven Platform for Mobile Hydraulic Power
The Danfoss Series 45 axial piston pump is a variable displacement open-circuit pump family developed for mobile hydraulic equipment that requires controlled hydraulic flow, efficient power transmission and dependable operation under demanding working conditions.
The Series 45 portfolio includes multiple frame sizes and configurations identified by designations such as LR, KR, K2, JR, ER and FR. These configurations cover different displacement ranges, mounting arrangements, rotation options, control solutions and application requirements.
Its modular architecture allows hydraulic system designers, OEMs, distributors and maintenance companies to select a pump according to required flow, pressure, speed, control method and machine installation conditions.
Understanding LR, KR, K2, JR, ER and FR
Compact lower-displacement Series 45 configuration. Typical L-frame sizes include 25 and 30 cm³/rev.
K-frame Series 45 pump configuration, commonly available in approximately 38 and 45 cm³/rev classes.
Compact K2 platform covering approximately 25–45 cm³/rev with modern control configurations.
J-frame configuration covering a broader medium-displacement range from approximately 45 to 75 cm³/rev.
F-frame Series 45 configuration generally covering approximately 74–90 cm³/rev.
High-capacity E-frame configuration, including approximately 100, 130 and 147 cm³/rev sizes.
Designed Around Machine Control
Series 45 pumps can be configured with a broad selection of hydraulic and electronic control solutions. Pressure compensation and load sensing options support efficient flow management, while selected configurations provide electronic control and power-management functions.
Why Choose a Danfoss Series 45 Pump?
High Hydraulic Efficiency
Optimized pump architecture helps reduce hydraulic losses and heat generation in demanding mobile systems.
Broad Displacement Range
From compact 25 cm³/rev configurations to high-capacity 147 cm³/rev pumps, the family supports diverse machine requirements.
Flexible Installation
Multiple shaft, flange and port options simplify integration into new machines and replacement projects.
Proven Mobile Platform
The Series 45 family is designed for construction, agriculture, material handling and specialty mobile equipment.
Where Are Series 45 Pumps Used?
Motor graders, backhoe loaders, wheel loaders, compact construction equipment and other mobile machines.
Harvesters, sprayers and agricultural machinery requiring reliable variable hydraulic flow.
Telehandlers, reach stackers, container handlers and forklift-related hydraulic systems.
Paving machines, road construction equipment and other mobile hydraulic machinery.
Forestry forwarders, harvesters and specialized heavy-duty equipment.
Screeners, crushers, drilling machines, fan drives and other specialized hydraulic systems.
Danfoss Series 45 Pump Questions & Answers
1. What is a Danfoss Series 45 pump?
The Danfoss Series 45 is a family of variable displacement axial piston pumps designed primarily for open-circuit mobile hydraulic applications.
2. What is the displacement range of Series 45 pumps?
The current Series 45 family covers approximately 25 to 147 cm³/rev, depending on frame and configuration. Common groups include K2, J, F and E frames.
3. What are LR and KR in the Danfoss Series 45 model code?
LR generally identifies an L-frame variable displacement pump configuration, while KR identifies a K-frame configuration. The final model code also specifies rotation, displacement, control and mechanical options.
4. What does JR mean in a Series 45 pump?
JR refers to a J-frame variable displacement open-circuit pump configuration with the rotation direction identified by the complete model code.
5. What are FR and ER Series 45 pumps?
FR identifies an F-frame Series 45 pump configuration, while ER identifies an E-frame configuration. These frames cover larger displacement classes than the compact L and K configurations.
6. What is the maximum pressure of a Series 45 pump?
Depending on frame and displacement, continuous pressure can reach approximately 310 bar, while selected configurations have higher intermittent or peak ratings. The exact rating must be checked against the pump model code.
7. What control options are available?
Series 45 pumps can be configured with pressure compensation, load sensing and selected electronic control solutions such as Electronic Displacement Control, Fan Drive Control and Electronic Torque Limiting.
8. Can a Series 45 pump be used as a direct replacement?
A direct replacement should never be selected by displacement alone. Rotation, control type, shaft, mounting flange, port configuration, pressure rating and auxiliary drive arrangement must be verified.
9. What information should an overseas buyer provide?
The best information is the complete Danfoss model code, nameplate photograph, displacement, rotation direction, control type and machine application. This helps suppliers identify the correct configuration.
10. Why is the Series 45 popular in mobile equipment?
Its combination of variable displacement, multiple frame sizes, flexible controls, efficient hydraulic performance and broad mounting options makes the Series 45 suitable for many mobile hydraulic machine designs.
How to Select the Correct Series 45 Pump
For international sourcing, buyers should confirm the complete model code rather than ordering only by "LR", "KR", "K2", "JR", "ER" or "FR". The required displacement, rotation, pressure rating, control type, shaft, mounting flange, ports and auxiliary drive should all match the original hydraulic system.
✓ Nameplate photo
✓ Displacement
✓ Rotation direction
✓ Control type
✓ Machine model
A Flexible Hydraulic Platform for Global Mobile Equipment
The Danfoss Series 45 axial piston pump provides a flexible hydraulic solution for mobile machines requiring variable displacement flow, reliable pressure performance and adaptable control. From compact LR and KR configurations to the K2, JR, FR and ER frame families, the Series 45 portfolio covers a broad range of hydraulic flow requirements. Its application range includes construction machinery, agricultural equipment, material handling machines, road-building equipment, forestry machinery and specialized mobile systems. For B2B buyers looking for a Danfoss 45 Series replacement pump, accurate model-code identification is the key to achieving a reliable match.
