Danfoss SNW2 SNP2 Tandem Gear Pump | SNW2NN/017 SNP2NN/6.0 | Hydraulic Double Pump

The SNW2NN/SNP2NN Series tandem gear pumps by Chengyuan Hydraulic are high-pressure multi-circuit systems fully compatible with Danfoss technical standards. This specific configuration features a 17cc (SNW2NN/017) front pump paired with a 6.0cc (SNP2NN/6.0) rear pump, coupled via a high-strength internal spline. The SNW2 series combines a lightweight aluminum alloy body with heavy-duty cast iron covers for an optimal power-to-weight ratio. Designed for mobile and industrial machinery requiring independent hydraulic circuits, this tandem unit offers 100% original-place interchangeability. Each unit undergoes 100% simulated condition testing to guarantee volumetric efficiency and durability even under simultaneous peak load conditions.

Technical Specifications :

• Front Pump: SNW2NN/017 (17.0 $cm^3/rev$)

• Rear Pump: SNP2NN/6.0 (6.0 $cm^3/rev$)

• Configuration: SNW2NN + SNP2NN Tandem unit

• Rated Operating Pressure: 250 bar (25 MPa / 3625 psi)

• Peak Operating Pressure: 280 bar (28 MPa / 4060 psi)

• Max Rated Speed: 3500 rpm (depending on viscosity and inlet pressure)

• Shaft Specification: 02AG (Specific Tapered or Splined end as per Danfoss code)

• Rotation: R (Right-hand / Clockwise)

• Porting: Threaded ports (B7/B5 specs)

• Efficiency: Volumetric efficiency $\ge 96\%$

Key Technical Advantages:

• Precision Gear Grinding: The gears are manufactured from high-grade steel, heat-treated, and precision-ground to micron tolerances. This minimizes pressure ripples and trapped oil pulses, resulting in ultra-low noise levels even at full operating pressures.

• Pressure-Balanced Floating Side Plates: Both the front and rear pumps are equipped with automatic pressure-compensated side plates. These plates adjust clearances according to output pressure, compensating for thermal expansion and minimizing internal leakage for stable flow across variable temperatures.

• DU High-Load Bearings: Featuring specialized DU composite bushings with superior anti-friction and load-bearing properties. The tandem coupling is reinforced to withstand the cumulative torque of both stages, preventing shaft failure during high-cycle industrial operations.

• Compact Modular Tandem Design: The SNP2NN rear pump is coupled to the SNW2NN via a precision tandem connector. This modular approach provides two independent power sources while significantly reducing the installation footprint within a chassis or manifold.

Application Areas:

• Agricultural Machinery: Dual-circuit supply for tractor steering and rear hitch lifting systems.

• Construction Equipment: Combined power for excavator pilot systems and cooling fan motors.

• Industrial Power Units: Hydraulic presses requiring simultaneous fast-approach and high-pressure clamping circuits.

Expert Maintenance Tips:

• Torque Awareness: Avoid running both pump stages at peak pressure simultaneously for extended periods to reduce mechanical stress on the primary drive shaft and PTO.

• Inlet Integrity: Since the front pump has a significant displacement, ensure the suction line is correctly sized and airtight. Even minor air leaks can lead to aeration, which causes catastrophic cavitation to the precision gears.

• Dual-Circuit Filtration: Even if both stages share a common suction port, it is highly recommended to install pressure filters on both outlets to prevent cross-contamination in the event of a component failure in one circuit.