Product Overview
The SNP1NN, SKP1NN, SNP2NN, and SKP2NN series high-pressure hydraulic gear pumps are built upon the Danfoss (formerly Sauer-Danfoss/Turolla OpenCircuitGear™) technology platform. This series comprises peak-performance fixed-displacement external gear pumps, constructed with a high-strength extruded aluminum body, aluminum cover, and flange, with all pumps pressure-balanced for exceptional efficiency.
Key Interchangeability Advantage: Our SNP/SKP series pumps are manufactured to strict Danfoss/Turolla original design specifications, ensuring 100% direct interchangeability with original units—no modifications to mounting interfaces or piping layouts are required. Every pump undergoes 100% factory performance testing under simulated operating conditions (covering rated pressure, peak pressure, and full speed range performance curves), guaranteeing plug-and-play reliability with zero performance deviation.
Product Line Differentiation:
Group 1 (SNP1NN/SKP1NN) and Group 2 (SNP2NN/SKP2NN) pumps can be combined within or across groups to form multi-stage pump assemblies.
Technical Specifications
SNP1NN Series (Group 1)
Family: Group 1 Standard Gear Pump
Displacement Range: 1.2 – 12 cm³/rev
Rated Continuous Pressure: Up to 250 bar
Peak Pressure: Up to 270 bar
Maximum Speed: Up to 4000 rpm
Minimum Speed at 150 bar: 800 rpm
Integral Valve: Optional relief valve integration
Mounting Flange: European 4-bolt (pilot 025)
Drive Shaft: Taper 1:8-M7-Key 2.41mm
Ports: C2C2 Diamond (26mm PCD 12×26×M5)
Seals: Standard NBR
Rotation: R (Clockwise) / L (Anti-Clockwise) optional
Material: High-strength extruded aluminum
SKP1NN Series (Group 1)
Family: Group 1 High-Torque Gear Pump, special version of SNP1NN
Displacement Range: 0.25 – 12 cm³/rev
Rated Continuous Pressure: Up to 250 bar
Peak Pressure: Up to 270 bar
Maximum Speed: Up to 4000 rpm
Design Features: Integral valves, pressure-balanced design, high torque capacity
Mounting: SAE standard compatible (06SA configuration)
Material: High-strength extruded aluminum
SNP2NN Series (Group 2)
Family: Group 2 Standard Gear Pump
Displacement Range: 6.0 – 22.8 cm³/rev
Rated Continuous Pressure: 180 – 210 bar
Peak Pressure: Up to 200 bar
Maximum Speed: Up to 3000 rpm
Mounting Flange: European 4-bolt (pilot 036.5mm)
Drive Shaft: Parallel 015-L30+Key 4×25mm
Ports: C7C3 Diamond (Inlet 40mm PCD 20×40×M8 / Outlet 30mm PCD 13.5×30×M6)
Seals: Standard NBR
Rotation: R (Clockwise)
Material: High-strength extruded aluminum
SKP2NN Series (Group 2)
Family: Group 2 High-Torque Gear Pump
Displacement: Full Group 2 displacement range
Rated Continuous Pressure: Comparable to SNP2NN
Design Features: Integral valves, extruded aluminum body, high torque capacity, ideal for medium and large off-highway vehicles
Key Technical Advantages
1. High-Strength Extruded Aluminum Body + Pressure-Balanced Design
The series features a high-strength extruded aluminum body with aluminum cover and flange. The pressure-balanced design ensures automatic hydraulic clearance compensation between gears and housing, significantly improving volumetric efficiency and minimizing internal leakage—delivering stable flow output even under high-pressure conditions.
2. Compact, Lightweight Design with High Power Density
Group 1 pumps are exceptionally compact and lightweight. The SNP1NN/7.8RN01DA, for example, weighs only 0.64 kg, offering outstanding power density—ideal for mobile equipment applications with strict space and weight constraints.
3. Low-Noise Operation
Optimized gear tooth profiles and precision machining, combined with the superior damping characteristics of aluminum construction, result in significantly lower noise levels compared to conventional cast-iron pumps. Low-noise operation improves operator working conditions and minimizes vibration interference with surrounding equipment.
4. Flexible Configuration Options
Supports SAE, ISO, and DIN mounting flange and drive shaft standards. Group 1, 2, and 3 pumps can be freely combined within or across groups to form multi-stage pump assemblies. The SNP1NN/SKP1NN/SNP2NN/SKP2NN series offers extensive options for port positions, seal materials, and valve integration to precisely match specific application requirements.
5. Wide Displacement and Speed Coverage
Group 1 offers up to 16 displacement options (0.25–12 cm³/rev) with speeds up to 4000 rpm; Group 2 covers 6.0–22.8 cm³/rev. The broad selection range ensures optimal matching for any flow requirement.
Application Areas
Turf Care: Lawn mowers, golf course maintenance equipment
Aerial Lifts: Scissor lifts, boom lifts
Material Handling: Forklifts, stackers, AGVs
Power Packs: Compact hydraulic power units, portable hydraulic tools
Construction Equipment: 5–20 ton loaders
Agricultural Machinery: Combine harvesters, seeders, sprayers
Off-Highway Vehicles: Medium and large off-highway vehicle hydraulic systems
Expert Maintenance Tips
1. Pre-Installation Checks
Verify pump rotation direction (R=Clockwise / L=Anti-Clockwise) matches system requirements. Reverse rotation will prevent pressure build-up and may cause damage.
Check drive shaft and coupling fit precision—taper 1:8 shafts require专用 taper sleeve press tools; never use hammer-driven installation.
Ensure port thread specifications precisely match hydraulic fittings (SNP1NN: G 3/8 BSPP; SNP2NN: G 3/4 inlet / G 1/2 outlet) to prevent thread damage and leakage.
2. First Start-Up & Break-In
Prime the pump housing with clean hydraulic oil before first start-up; ensure suction line is fully filled—never run dry.
Recommended break-in: operate at 60–70% of rated pressure for 15–30 minutes, then gradually load to rated conditions.
Minimum speed at 150 bar must not fall below 800 rpm to ensure adequate suction capability and lubrication.
3. Fluid & Filtration
Recommended hydraulic fluid: anti-wear hydraulic oil per DIN 51524 (HLP grade), ISO VG 32–46 viscosity.
Recommended filtration: β10 ≥ 75 (ISO 16889); return filter 10–20 μm.
Regularly monitor fluid cleanliness—maintain NAS 1638 Class 9 or ISO 4406 20/18/15 or better.
4. Routine Maintenance
Inspect system pressure, oil temperature, and oil quality every 1000 operating hours or 6 months.
Regularly check torque on pump and piping connection bolts to prevent loosening from vibration.
If abnormal noise or pressure fluctuation occurs, first check for air ingestion in the system (inspect suction line seals).
