Danfoss K2 series Open-circuit axial piston hydraulic pump

The K2 is an open-circuit, variable-displacement axial piston pump built on Danfoss's Series 45 platform. It replaces and updates the smaller end of that lineup — the frames handling 25 to 45 cm³/rev displacements — with a more compact, lighter housing and updated internals.

Danfoss designed the K2 frame specifically to shrink package size without sacrificing output. Compared to the pumps it replaces, the K2 housing is up to 20% shorter, up to 10% narrower, and up to 30% lighter, while offering higher rated pressure, speed, and temperature limits. For OEMs fighting for space in a crowded engine bay or trying to shave weight off a machine, that's a meaningful upgrade path on a proven platform rather than a completely new design to qualify.

Key Features and Benefits

Reduced Size and Weight

This is the headline change. Shrinking the envelope by up to 20% in length and 10% in width, while cutting weight by as much as 30%, gives design engineers real flexibility — whether that means a smaller engine compartment, room for additional components, or simply a lighter machine.

Higher Performance Ratings

Alongside the size reduction, the K2 frame pushes rated pressure, speed, and temperature limits higher than the pumps it replaces. Series 45 pumps overall are rated for continuous pressures up to 310 bar and momentary peaks up to 350 bar, with speeds up to 3,600 rpm depending on model and inlet condition.

Noise and Vibration Reduction

Additional internal features dissipate noise and vibration at the source, and the housing includes sound-deadening characteristics. That matters increasingly for operator comfort regulations and for machines that operate close to people — think compact construction equipment or ag machinery used near residential areas.

Modular Endcap and Port Configurations

The K2 is available with four distinct endcap styles, SAE-B mounting flanges, SAE flanged (code 61) or O-ring boss ports, and both axial (end) and radial (side) port orientations. Shaft options include splined, straight-keyed, and tapered configurations, in either clockwise or counterclockwise rotation. That flexibility means the same core pump can be configured for a wide range of machine layouts without a custom design.

Optional Displacement Limiters

For applications that need a hard ceiling on flow, Danfoss offers an optional fixed maximum displacement limiter (capping output at roughly 92% of full displacement) and a separate adjustable maximum displacement limiter for fine-tuning the upper flow limit in the field.

Example Applications

Wheel loaders and compact excavators: The K2's smaller footprint helps packagers fit hydraulics into tighter compartments on compact machines without downgrading performance.

Forestry and agricultural equipment: Lower noise output and Fan Drive Control compatibility make the K2 attractive where operator comfort and cab noise levels are a selling point.

Material handling equipment: Load-sensing control lets the pump match flow to actual demand across multiple simultaneous functions (boom, bucket, auxiliary circuits), improving fuel efficiency versus fixed-displacement alternatives.

Retrofit and rebuild programs: Because the K2 shares mounting and control compatibility with earlier Series 45 J, F, and E frames, it's a common upgrade path when rebuilding older machines that used previous-generation Danfoss pumps.

For more information on the K2 hydraulic pump, please visit https://www.baolilaihydraulic.com/product/.

Specifications

Selection Table

Q1: What's the difference between Pressure Compensation and Load Sensing control?

A1: Pressure Compensation (PC) limits pump output once system pressure reaches a set threshold, protecting the system from over-pressurization. Load Sensing (LS) goes a step further by continuously matching pump flow to actual downstream demand signaled from the control valve, which typically improves fuel efficiency in systems with varying flow needs.

Q2: Can a K2 pump replace an older Series 45 K-frame pump directly?

A2: In many cases, yes — the K2 was designed with backward compatibility to common Series 45 J, F, and E controls in mind, and it's built to the same platform philosophy as the frame it replaces. That said, mounting dimensions, port locations, and shaft configurations vary by exact model code, so it's worth cross-referencing the specific model number against Danfoss's technical documentation before assuming a drop-in fit.

Q3: How to purchase a K2 hydraulic pump?

A3: You can visit https://www.baolilaihydraulic.com/contact/ to contact us and purchase our products through various methods.

Q4:What is the price and delivery time of the K2 hydraulic pump?

A4: The specific price and delivery time will be provided based on the specific model you provide.