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DANFOSS / EATON-S2 39 VARIABLE PUMP CW

Description & Features

Designed for demanding mobile applications, the Danfoss / Eaton S2 39 Variable Pump Cw is a variable displacement, closed circuit piston pump suited for use in construction, agriculture, truck and bus, oil and gas, and other mobile equipment environments. Its closed circuit design makes it well matched to hydrostatic transmission systems where precise flow control and reliability under sustained load are required.

Supplied under the Danfoss Power Solutions brand, this pump supports multiple control options and is Pro-FX ready, allowing integration with advanced electronic control architectures. The Series 2 platform has an established record of performance in conditions where consistent output and control responsiveness are priorities.

SKU: 3922-066

Supplier Part Number (MPN): 3922-066

Specifications

Brand Danfoss	Control Type Electronic Proportional	Dimensions 12.04 in L x 14.664 in W x 8.7 in H	Drive Shaft Type Splined	Housing Color Black	Housing Material Iron	Inlet Type Flanged	Mounting Type 4-Bolt Flanged	nmfc 125820	Outlet Type Flanged	Rotation Direction Clockwise	Segment Code B	Series ACL 2 Series

Product Questions & Answers (2)

Question by: Travis W on Nov 22, 2025, 4:39 PM

What sort of applications is this pump typically used for?

Answer by: Customer Support on Nov 24, 2025, 6:54 AM

This Danfoss/Eaton S2 pump is well-suited for demanding mobile applications, including construction, agriculture, truck and bus, and oil and gas equipment.

Question by: Ross T on May 11, 2025, 2:01 PM

Got a hydrostatic transmission setup on a piece of construction equipment and trying to figure out if this pump would fit what we're doing. Is the closed circuit design on this one actually built for that kind of application?

Answer by: Customer Support on May 13, 2025, 8:20 AM

Closed circuit piston pumps are the standard choice for hydrostatic transmission systems, and that's exactly what this pump is set up for. The variable displacement gives you the flow control you need when loads shift, which matters a lot in construction equipment where conditions change constantly. The Series 2 platform has a solid track record in that kind of sustained, demanding use, so it's not just a general-purpose pump being stretched into a role it wasn't meant for.