SNM3NN/033BN01BAM6E6E6NNBB Danfoss Gear Motor

Product Overview

The SNM3NN/033BN01BAM6E6E6NNBB/NNNNN is a Danfoss GearMe Aluminum Group 3 bidirectional fixed-displacement gear motor, not a conventional hydraulic gear pump.

Danfoss officially defines the SNM3NN family as a “Gr3 Bidirectional Motor – Axial drain on cover.” The 033 configuration corresponds to a 33.1 cm³/rev displacement, while the B code identifies bidirectional rotation.

The motor uses a compact external gear architecture with an aluminum Group 3 housing, fixed displacement gear set and bidirectional operating capability. Danfoss PowerSource classifies the product family as “GEAR MOTOR GR3 BIDIRECT FIXED DISPL.”

Public historical product information associates the exact configuration supplied by you with Danfoss material number 11123586, using the model code SNM3NN-/-033-B-N-01-BA-M6-E6-E6-NN-B-B-/-NNN-N-N. The configuration includes a 50.8 mm pilot, four-bolt mounting, 1:8 tapered shaft, axial case drain and E6 hydraulic ports.

Our replacement units are manufactured according to the original mechanical and hydraulic configuration and undergo 100% simulated operating-condition testing, including bidirectional operation, flow, pressure, leakage and running stability.

Technical Specifications

SNM3NN/033BN01BAM6E6E6NNBB/NNNNN

• Model: SNM3NN/033BN01BAM6E6E6NNBB/NNNNN
• Danfoss Material Number: 11123586 based on historical public product references
• Brand: Danfoss
• Product Platform: GearMe Aluminum
• Product Type: Hydraulic Gear Motor
• Group: Group 3
• Family: SNM3NN
• Motor Type: Bidirectional Fixed-Displacement Gear Motor
• Displacement: 33.1 cm³/rev
• Rated Pressure: 250 bar
• Peak Pressure: 270 bar
• Minimum Speed: 800 rpm
• Maximum Speed: 2500 rpm
• Rotation: Bidirectional
• Displacement Control: Fixed Displacement
• Rear Cover: M6, Axial Drain on Cover
• Mounting Flange: 01, Ø50.8 mm pilot, 4-bolt mounting, 98.4 × 128.1 mm
• Drive Gear: BA, 1:8 taper, M14 × 1.5, Key 4
• Inlet Port: E6, 20 × 1-1/16-12 UN
• Outlet Port: E6, 20 × 1-1/16-12 UN
• Port Position: NN, Standard
• Seals: B, Viton
• Screws: B, Dacromet/Geomet-coated configuration
• Valve Setting: NNN, No setting
• Weight: 7.2 kg

The displacement, rated/peak pressure, speed range and weight are taken from Danfoss’s official GearMe Group 3 technical information for the 033 frame size.

The mounting, shaft, rear-cover and port codes are supported by Danfoss’s official model-code documentation and PowerSource product configurations.

Key Technical Advantages

1. 33.1 cm³/rev Group 3 Displacement

Danfoss specifies 33.1 cm³/rev for the Group 3 033 configuration. The actual displacement should be used in hydraulic sizing calculations rather than treating “033” as an approximate nominal number.

Theoretical input flow can be estimated using:

Q = Vg × n / 1000

At 2500 rpm:

33.1 × 2500 / 1000 = 82.75 L/min

This is a theoretical value before volumetric losses and should not be treated as guaranteed operating flow.

2. Bidirectional Operation

The B rotation code indicates bidirectional operation, allowing the motor to rotate in either direction according to the hydraulic pressure arrangement. This is particularly useful for fans, winches, conveyors and reversible mobile-machine functions.

3. 250 bar Rated and 270 bar Peak Pressure

For the Group 3, 033 SNM3NN configuration, Danfoss specifies:

• 250 bar rated pressure
• 270 bar peak pressure

The peak value must not be interpreted as a continuous-duty pressure rating.

4. Aluminum Group 3 Construction

The official Danfoss manual is specifically titled GearMe Aluminum Group 1, 2, and 3 Motor, confirming the aluminum construction platform. Aluminum construction provides a useful strength-to-weight balance for mobile hydraulic machinery.

5. Axial Case Drain

Danfoss defines SNM3NN as a bidirectional motor with axial drain on the cover. Proper case-drain management is important for shaft-seal life and internal pressure control.

6. Viton Seal Configuration

The B seal configuration corresponds to Viton seals in the Danfoss coding system. This provides a suitable sealing option for applications requiring enhanced temperature and fluid-material resistance.

Application Areas

Typical applications for the SNM3NN Group 3 platform include:

• Construction machinery
• Wheel loaders
• Hydraulic fan drives
• Cooling fan drives
• Winches
• Conveyor systems
• Material-handling equipment
• Agricultural machinery
• Mobile hydraulic auxiliary drives
• Reversible rotary actuators

Historical public documentation for Danfoss 11123586 also associates this configuration with equipment such as the Hitachi ZW310-5A. This can be used as a cross-reference during identification, but final interchangeability must still be verified against the actual machine configuration.

Expert Maintenance Tips

Verify Motor Versus Pump Identification

The SNM3NN is a motor family. It should not be substituted directly with an SNP gear-pump configuration simply because displacement and dimensions appear similar. Danfoss’s official model structure clearly distinguishes the motor and pump product families.

Protect the Axial Case Drain

Because this configuration uses an M6 axial case drain, ensure the drain line is correctly connected and that case pressure remains within the allowable operating range.

Keep Speed Within 800–2500 rpm

Danfoss specifies a minimum speed of 800 rpm and maximum speed of 2500 rpm for the 033 Group 3 configuration.

Do Not Run Continuously at 270 bar

The 250 bar value is the rated pressure, while 270 bar is the peak pressure. System pressure settings should therefore be based on the actual duty cycle rather than the peak value.

Verify the Tapered Shaft

The exact configuration uses a:

• 1:8 tapered shaft
• M14 × 1.5
• Key 4

The coupling must correctly match the shaft geometry. Forced assembly should never be used to compensate for dimensional mismatch.

Confirm E6 Port Compatibility

The E6 configuration uses 20 × 1-1/16-12 UN inlet and outlet ports. A motor with the same displacement but different porting cannot automatically be regarded as an interchangeable replacement.

Maintain Hydraulic Cleanliness

Inspect hydraulic oil, filtration and the reservoir whenever the motor is replaced. Contaminants can accelerate wear on gears, bushings, side plates and seals, reducing service life.