Product Overview
The NSH-6, NSH-10, NSH-14, NSH-25, NSH-32, NSH-50, and NSH-100 series hydraulic gear pumps are high-performance external gear pumps originating from the Soviet/Russian NSh (НШ) gear pump technology platform. These pumps are widely compatible with MTZ (Minsk Tractor Works) series tractors and their variants, serving as the core power components for hydraulic systems in agricultural machinery, construction equipment, and industrial vehicles.
This series features external gear pump construction with displacements covering 6 to 100 cm³/rev across seven specifications. Standard models (M series) feature high-strength aluminum alloy housings with maximum continuous pressure of 160 bar, intermittent pressure of 210 bar, and peak pressure of 250 bar. Higher-pressure versions (MЧ series) feature high-strength cast iron housings with maximum continuous pressure up to 200 bar.
Key Interchangeability Advantage: Our NSH series gear pumps are manufactured to strict Russian NSh original design specifications, ensuring 100% direct interchangeability with original units. All mounting interfaces, flange dimensions, spline shaft specifications, and port positions are identical to the original product—directly replacing original pumps on MTZ-80/82, DT-75, T-150, K-700, DON series combines, and numerous other equipment models with no modifications required. Every pump undergoes 100% factory performance testing under simulated operating conditions, guaranteeing plug-and-play reliability with zero performance deviation.
Model Code Breakdown (based on NSh series designation rules):
NSH (НШ) = Series: External Gear Pump (Насос Шестеренный)
6 / 10 / 14 / 25 / 32 / 50 / 100 = Nominal displacement (cm³/rev)
M = Aluminum housing standard type (160 bar continuous)
MЧ = Cast iron housing high-pressure type (200 bar continuous)
A / U / K = Design modification code
3 / 4 = Spline specification code
L / R / П = Rotation direction: Left-hand / Right-hand
Technical Specifications
NSH Series – General Specifications
Product Series: NSH (NSh) Series External Gear Pump
Origin Standard: Russian GOST 19027-89
Pump Type: External Gear Pump
Direction of Rotation: Left-hand (L) or Right-hand (R) (fixed, model-dependent)
Housing Material: High-strength aluminum alloy (M series) / High-strength cast iron (MЧ series)
Gear Material: Case-hardened special alloy steel
Bearing Type: Bronze composite plain bearings
Seals: NBR (Nitrile Butadiene Rubber)
Operating Temperature Range: -30℃ to +120℃
Recommended Fluid: Mineral hydraulic oil
Filtration Requirement: Inlet filtration ≤ 100 μm
Mounting Position: Optional
NSH-6 (NSH6M)
Displacement: 6.0 cm³/rev
Maximum Continuous Pressure: 160 bar
Maximum Intermittent Pressure: 210 bar
Maximum Peak Pressure: 250 bar
Maximum Speed: 4200 rpm
Minimum Speed: 500 rpm
NSH-10 (NSH10M)
Displacement: 10.0 cm³/rev
Maximum Continuous Pressure: 160 bar
Maximum Intermittent Pressure: 210 bar
Maximum Peak Pressure: 250 bar
Maximum Speed: 3600 rpm
Minimum Speed: 500 rpm
NSH-14 (NSH14M)
Displacement: 14.0 cm³/rev
Maximum Continuous Pressure: 160 bar
Maximum Intermittent Pressure: 210 bar
Maximum Peak Pressure: 250 bar
Maximum Speed: 3600 rpm
Minimum Speed: 500 rpm
NSH-25 (NSH25M)
Displacement: 25.0 cm³/rev
Maximum Continuous Pressure: 160 bar
Maximum Intermittent Pressure: 210 bar
Maximum Peak Pressure: 250 bar
Maximum Speed: 3600 rpm
Minimum Speed: 500 rpm
NSH-32 (NSH32M)
Displacement: 32.0 cm³/rev
Maximum Continuous Pressure: 160 bar
Maximum Intermittent Pressure: 210 bar
Maximum Peak Pressure: 250 bar
Maximum Speed: 3600 rpm
Minimum Speed: 500 rpm
Weight: Approx. 7 kg
Volumetric Efficiency: Up to 93%
NSH-50 (NSH50M)
Displacement: 50.0 cm³/rev
Maximum Continuous Pressure: 160 bar
Maximum Intermittent Pressure: 210 bar
Maximum Peak Pressure: 250 bar
Maximum Speed: 3600 rpm
Minimum Speed: 500 rpm
Rated Flow: 107.2 L/min
NSH-100 (NSH100M)
Displacement: 100.0 cm³/rev
Maximum Continuous Pressure: 160 bar
Maximum Intermittent Pressure: 210 bar
Maximum Peak Pressure: 250 bar
Maximum Speed: 3600 rpm
Minimum Speed: 500 rpm
Key Technical Advantages
1. High-Strength Aluminum Housing for Lightweight High Power Density
M series models feature high-strength aluminum alloy housings, delivering substantial weight reduction while maintaining structural integrity. The lightweight design simplifies installation and reduces the load on host machinery—particularly critical for weight-sensitive mobile equipment applications. MЧ series models feature high-strength cast iron housings for continuous pressure up to 200 bar.
2. Precision Design for High Volumetric and Mechanical Efficiency
The NSH Series features precise and detailed design, delivering high volumetric efficiency and high mechanical efficiency. The NSH-32 achieves volumetric efficiency up to 93%. Combined with case-hardened special alloy steel gears and bronze composite plain bearings, wear resistance and service life are significantly enhanced.
3. Compact Lightweight Construction for Low Noise Operation
Aluminum housing combined with compact and precise structural design delivers low noise operation while maintaining strength—a significant advantage for tractor cabins and other noise-sensitive applications.
4. Wide Displacement Coverage for Flexible Equipment Compatibility
The NSH Series offers 6 to 100 cm³/rev across seven displacement options, covering everything from light tractors to heavy construction equipment. Available in both left-hand (L) and right-hand (R) rotation directions. The broad displacement and rotation options ensure precise matching to installation and performance requirements across diverse equipment.
5. Extensive Compatibility Coverage
The NSH Series pump is the core power component of MTZ tractor hydraulic systems, with performance directly affecting the reliability and efficiency of critical functions such as lifting, steering, and braking. These pumps are compatible with MTZ-80/82, DT-75, T-150, T-40, K-700, DON-680/1200/1500 combines, KAMAZ, BELAZ, and numerous other vehicle models and variants.
Application Areas
MTZ Series Tractors: MTZ-80, MTZ-82, MTZ-1221 and other Belarus tractor hydraulic systems
Combine Harvesters: DON-680, DON-1200, DON-1500 series combines
Crawler Tractors: DT-75 series crawler tractors
Heavy Construction Vehicles: K-700 Kirovets tractors, T-150 tractors
Mining Vehicles: BELAZ mining dump trucks
Trucks & Commercial Vehicles: KAMAZ series trucks
Loaders & Construction Equipment: Wheel loaders, bulldozers, graders
Agricultural Machinery: Various agricultural tractors, sprayers, seeders hydraulic systems
Expert Maintenance Tips
1. Model Confirmation and Selection
Complete NSH series model should include: Series + Displacement + Material Code (M/MЧ) + Rotation (L/R) + Spline Specification (3/4) , e.g., NSH32M-3L.
M series features aluminum housing with continuous pressure 160 bar; MЧ series features cast iron housing with continuous pressure 200 bar. Verify operating pressure requirements during selection.
NSH-6 maximum speed is 4200 rpm; all other models have maximum speed 3600 rpm. Verify original drive speed during selection.
2. Rotation Direction Confirmation
3. First Start-Up & Oil Priming
Prime the pump housing with clean hydraulic oil before first start-up; ensure suction line is fully filled—never run dry.
Recommended fluid: GOST-spec mineral hydraulic oil.
Maintain operating temperature within -30℃ to +120℃.
Minimum speed: 500 rpm.
4. Filtration & Fluid Cleanliness
5. Operating Monitoring
Continuous operating pressure must not exceed 160 bar (M series) or 200 bar (MЧ series).
If abnormal noise or pressure fluctuation occurs, first check suction lines for leakage or blockage.
Regularly check torque on pump and piping connection bolts to prevent loosening from vibration.
