Sauer Danfoss SNP3/33D CO01 Hydraulic Gear Pump

Sauer Danfoss SNP3/33D CO01 Hydraulic Gear Pump (Group 3 | 33.1 cm³/rev | Clockwise)

The Sauer Danfoss SNP3/33D CO01 is an external gear pump engineered for severe-duty mobile, industrial, and offshore hydraulic power units. Belonging to the Group 3 family, this fixed-displacement pump delivers a nominal displacement of 33.1 cm³/rev (2.02 in³/rev) and is built with an extruded, high-tensile aluminum alloy body fitted with heavy-duty cast iron mounting flanges and rear covers.

The specific model configuration incorporates a standard European 4-bolt rectangular mounting flange (50.8 mm pilot), an industry-standard 1:8 tapered shaft with a 4 mm woodruff key, and standard European flanged fluid porting. It operates continuously at working pressures up to 250 bar (3,625 psi) and speeds up to 3,000 RPM, making it a robust hydraulic power source for heavy deck machinery, mobile winches, and electro-hydraulic steering gears.

Model Details:

• Manufacturer Part Number (MPN): SNP3/33D CO01 (Alternate code: SNP3NN/033 D CO01)
• Product Series: SNP3 (Group 3 External Gear Pump)
• Direction of Rotation: D (Clockwise / Right-hand rotation when viewing the drive shaft)
• Drive Shaft Code: CO01 (Tapered shaft 1:8, 4 mm key, M14x1.5 threaded end with lock nut)
• Mounting Flange Code: European standard rectangular flange, Ø50.8 mm centering spigot, 128.1 mm x 98.4 mm 4-hole pattern
• Condition: NEW – 100% genuine unused surplus

Key Features

1. Hydrostatic Pressure Balancing: Floating bearing blocks utilize calibrated rear pressure zones to maintain precise axial clearances against the gear faces, delivering volumetric efficiencies exceeding 95% at 250 bar.
2. High-Grade Bimetallic Journals: Extruded aluminum housing paired with PTFE-coated, bronze-backed steel sleeve bushings provides superior seizure resistance during high-load and cold-viscosity start sequences.
3. 1:8 Tapered Drive Interface: Precision ground 1:8 tapered shaft (CO01) with a 4 mm key eliminates micro-slippage under shock loads and harmonic pulsation from diesel PTO drives.
4. Integral Flanged Ports: 4-bolt diamond/square flange port configuration eliminates pipe-thread stress cracking, providing zero-leak SAE/DIN high-pressure port integrity under continuous cyclic pressure spikes.
5. Extreme Mechanical Durability: 12-tooth integral drive and driven gear design manufactured from case-hardened alloy steel, optimized for low hydraulic pulsation and reduced operating noise levels.

Technical Details

Frequently Asked Questions

Can the rotation of the Sauer Danfoss SNP3/33D CO01 be reversed in the field?

The rotation of an SNP3 series pump can be mechanically reversed, but it requires disassembling the unit to flip the gear housing, reverse the orientation of the pressure plates/bearing blocks, and reposition the internal balance seals. We strongly advise against uncertified field conversions because breaking the factory case seal voids the warranty and risks improper seal track seating; always purchase the designated “S” (Counter-Clockwise) or “D” (Clockwise) pump model from the factory.

What hydraulic oil viscosity index is required for this Group 3 pump?

For standard operation between 30°C and 60°C, a high-quality anti-wear hydraulic oil (such as ISO VG 46 or ISO VG 68) with a kinematic viscosity between 15 and 25 cSt (mm²/s) delivers peak efficiency. Cold-weather start-up viscosity should remain below 1,600 cSt, and continuous operation should never drop below 10 cSt to prevent hydrodynamic oil-film collapse across the journal bearings.

How do I identify if my worn pump is an SNP3 or an older TAP2290 model?

Look closely at the identification tag and measure the overall casing length. While mounting flanges and tapered shafts match, the modern SNP3 body is 4.5 mm longer than the discontinued TAP2290. The SNP3 incorporates updated pressure balancing plates that provide higher operating pressures (250 bar continuous versus 210 bar on legacy TAP2290 units).