Danfoss 7005033 Series 45 L025 Hydraulic Pump

Danfoss 7005033 Series 45 L025 Hydraulic Axial Piston Pump (CW, 25 cc/rev)

The Danfoss 7005033 is a variable-displacement axial piston pump designed for medium-power open-circuit hydraulic networks. Built on the field-proven Danfoss Series 45 “L” Frame (L025) platform, this unit converts rotary mechanical input into controlled hydrostatic power with minimal parasitic friction and exceptional volumetric efficiency.

Comes with a 9-piston rotating group and a rigid swashplate assembly, the 7005033 provides infinite displacement modulation from 0 to 25.0 cm³/rev (1.53 in³/rev). Rated for continuous duty at 260 bar (3,770 psi) and peak intermittent pressures up to 310 bar (4,500 psi), this clockwise (CW) rotation unit delivers high power density, compact envelope geometry, and low operational noise profiles across varying drive speeds.

Model Details

• Manufacturer: Danfoss Power Solutions / Sauer-Danfoss
• Product Line: Series 45 Axial Piston Open Circuit Pumps
• Frame Size: L Frame (L025)
• Displacement: 25.0 cc/rev (1.53 cu in/rev)
• Rotation: Clockwise (CW) viewed from drive shaft end
• Part Number / MPN: 7005033
• Full Model Code Structure: LR-R-025C-PC-25-NN-NN-N-3-C2BG-A6N-PLB-NNN-NNN

Compatible Equipment

• Electric Motor Standards: Direct-drive coupling via IEC 160/180 or NEMA 213TC–256TC bell-housings equipped with SAE-B pump adapter rings.
• Engine Power Take-Off (PTO): Mounts directly to standard SAE-B accessory pads on marine auxiliary diesel gensets (Caterpillar C4.4/C7.1, Cummins QSB series, Perkins, Volvo Penta D5/D7) and industrial transmission PTO output pads.
• Deck Equipment: Winch drives and power packs manufactured by MacGregor, Rolls-Royce/Kongsberg Marine, Brusselle Carral, and Rapp Marine.

Part Number Cross-References

• Direct Model Code Interchange: 7005033 ↔ LR-R-025C-PC-25-NN-NN-N-3-C2BG-A6N-PLB-NNN-NNN
• Sauer-Danfoss Historical References: L25-PC-R-A6, Series 45 L25 PC series
• Functional Alternates (Check Control Configuration): 7005243 (LS variant), 1701391, 7005030, 7005032

Frequently Asked Questions

Can the Danfoss 7005033 pump rotation be reversed in the field from CW to CCW?

Reversing rotation on a Series 45 L Frame requires disassembling the housing to replace the valve plate, repositioning the swashplate cradle, and re-indexing the endcap port layout. Field conversion is not recommended without cleanroom facilities and dynamic test stand verification. For counter-clockwise applications, order the dedicated CCW model variant

What is the primary difference between the PC control and an LS control on the L025 pump?

The 7005033 features a Pressure Compensator (PC) control, which de-strokes the pump displacement to zero flow once system pressure reaches the preset limit (e.g., 250 bar). A Load Sensing (LS) control modulates both displacement and pressure based on an external signal line connected to a proportional directional valve, matching flow exactly to actuator speed while maintaining a constant pressure drop margin over the load.

What hydraulic oil types are approved for the Danfoss Series 45 L Frame?

The pump operates reliably on mineral-based hydraulic oils (HLP / DIN 51524 part 2) and synthetic polyol esters (HEES). If using environmentally acceptable hydraulic fluids (EAL / biodegradable oils) for marine compliance in US EPA VGP / offshore zones, derate operating temperatures by 10°C and shorten oil analysis intervals to track total acid number (TAN) progression and seal swelling.

How do I troubleshoot excessive case drain leakage on this unit?

Elevated case drain flow (> 3.5 L/min at working pressure) typically indicates physical wear on the cylinder block-to-valve plate interface, piston shoe slipper slack, or worn swashplate bearings. Check case drain fluid temperature: if the drain line is noticeably hotter than the reservoir return line, internal high-pressure fluid is short-circuiting to the case. The rotating group must be inspected and repitched.