Product Overview
The NSH Series (НШ) is one of the most representative hydraulic gear pump families from Eastern Europe, manufactured in strict accordance with GSTU and GOST standards. The series is widely used in hydraulic systems of MTZ (Minsk Tractor Plant) , Kirovets tractors, combine harvesters, loaders, motor graders, pavers, and other agricultural, road construction, and engineering machinery manufactured in Belarus, Russia, Ukraine, and other former Soviet states.
The NSH 40M-3 is one of the most widely used models for MTZ tractors, featuring a displacement of 40 cm³/rev. The “M” designation indicates the M Series (MASTER Series) with a high-strength aluminum alloy housing; the “3” indicates the pressure grade, with a maximum continuous pressure of 160 bar.
M Series vs. MЧ Series:
M Series (e.g., NSH40M-3): Aluminum alloy housing, maximum continuous pressure 160 bar – for standard hydraulic systems
MЧ Series (e.g., NSH20MЧ-4): High-strength cast iron housing, maximum continuous pressure 200 bar – for high-pressure heavy-duty applications
Manufactured to strict original specifications, with mounting flanges and shafts fully compliant with GSTU and GOST standards, this product features 100% form-fit-function interchangeability – mounting dimensions and port configurations are fully identical to original NSH series pumps, requiring zero modifications for direct replacement of original hydraulic pumps on MTZ tractors and other Eastern European equipment. Every pump undergoes 100% simulated duty-cycle testing prior to shipment, with performance validation conducted at rated pressure and flow conditions.
Model Code Breakdown (NSH40M-3):
NSH (НШ): Gear pump designation
40: Geometric displacement (cm³/rev)
M: Series designation (MASTER Series, aluminum housing)
3: Pressure grade (16 MPa / 160 bar)
Technical Specifications
NSH 40M-3 (MTZ Tractor Model)
Model Number: NSH40M-3 (НШ40М-3)
Series: NSH M Series (MASTER Series)
Standards: GSTU, GOST
Geometric Displacement: 40 cm³/rev
Maximum Continuous Pressure, P₁: 160 bar (16 MPa)
Maximum Intermittent Pressure, P₂: 210 bar (21 MPa)
Peak Pressure, P₃: 250 bar (25 MPa)
Maximum Speed, n_max: 3,000 min⁻¹
Minimum Speed, n_min: 500 min⁻¹
Construction: External gear pump
Housing Material: High-strength aluminum alloy
Rotation Direction: Right-hand (standard) / Left-hand (L suffix, e.g. NSH40L)
Shaft Type: GOST standard splined shaft
Fluid Compatibility: Mineral and special oils, kinematic viscosity 30–70 mm²/s at +50°C
Mounting: Flange mount (GOST standard)
Configuration: Single pump / Tandem pump (up to 2 sections)
NSH M Series (Full Displacement Range)
NSH6M-3: 6 cm³/rev, continuous 160 bar, intermittent 210 bar, peak 250 bar, max speed 4,200 min⁻¹
NSH10M-3: 10 cm³/rev, continuous 160 bar, intermittent 210 bar, peak 250 bar, max speed 3,600 min⁻¹
NSH14M-3: 14 cm³/rev, continuous 160 bar, intermittent 210 bar, peak 250 bar, max speed 3,600 min⁻¹
NSH16M-3: 16 cm³/rev, continuous 160 bar, intermittent 210 bar, peak 250 bar, max speed 3,600 min⁻¹
NSH25M-3: 25 cm³/rev, continuous 160 bar, intermittent 210 bar, peak 250 bar, max speed 3,600 min⁻¹
NSH32M-3: 32 cm³/rev, continuous 160 bar, intermittent 210 bar, peak 250 bar, max speed 3,000 min⁻¹
NSH40M-3: 40 cm³/rev, continuous 160 bar, intermittent 210 bar, peak 250 bar, max speed 3,000 min⁻¹
NSH50M-3: 50 cm³/rev, continuous 160 bar, intermittent 210 bar, peak 250 bar, max speed 2,400 min⁻¹
NSH100M-3: 100 cm³/rev, continuous 160 bar, intermittent 210 bar, peak 250 bar, max speed 2,400 min⁻¹
MЧ Series (High-Pressure Version)
NSH20MЧ-4: 20 cm³/rev, continuous 200 bar, intermittent 250 bar, peak 280 bar
NSH25MЧ-4: 25 cm³/rev, continuous 200 bar, intermittent 250 bar, peak 280 bar
NSH32MЧ-4: 32 cm³/rev, continuous 200 bar, intermittent 250 bar, peak 280 bar
NSH40MЧ-4: 40 cm³/rev, continuous 200 bar, intermittent 250 bar, peak 280 bar
NSH50MЧ-4: 50 cm³/rev, continuous 200 bar, intermittent 250 bar, peak 280 bar
Key Technical Advantages
1. GOST/GSTU Standard Compliance – 100% Interchangeability
The NSH Series gear pumps are manufactured in strict compliance with GOST and GSTU standards. Mounting dimensions, flange interfaces, and shaft configurations are fully identical to original Eastern European NSH pumps, enabling direct replacement on MTZ tractors, Kirovets tractors, combine harvesters, loaders, and other equipment without any modifications. The design of the MASTER series gear pumps is based on the extensive experience of factory experts and well-known companies around the world, focusing on efficient design and utilization of modern parts.
2. High-Strength Aluminum Alloy Housing – The Balance of Lightweight & Durability
The NSH M Series features a high-strength aluminum alloy housing, delivering lightweight construction without compromising structural integrity. Aluminum alloy provides excellent heat dissipation, effectively reducing operating oil temperatures and extending hydraulic system life – particularly critical for mobile machinery subjected to vibration, dust, and temperature fluctuations.
3. High Volumetric Efficiency & Low-Noise Operation – Dual Assurance of Reliability
The NSH Series employs high-precision machining of gear pairs and housings, ensuring minimal internal leakage and stable volumetric efficiency. Precision design delivers low noise levels during operation, making it ideal for agricultural and construction machinery applications where operator comfort matters. MASTER series gear pumps ensure consistent efficiency throughout their service life.
4. Wide Speed Range & Flexible Adaptability – Versatile Power Input Compatibility
The NSH Series supports a wide speed range from 500 to 4,200 min⁻¹, adapting to various drive configurations from tractor PTOs to direct engine drives. Both right-hand (standard) and left-hand (L suffix) rotation options are available to accommodate different equipment layouts.
5. Comprehensive Displacement Range & Modular Design – One-Stop Solution
The NSH Series offers a complete displacement spectrum from 6 to 100 cm³/rev, covering applications from compact tractors to large combine harvesters. Single-section and double-section combinations are available, with fully standardized mounting dimensions serving as a cost-effective aftermarket spare part for agricultural equipment repair.
6. Exceptional Durability – 2,000,000 Cycle Service Life
MASTER series gear pumps deliver a service life of 2,000,000 cycles – 100% longer than conventional “flat pumps”. This exceptional durability is the result of advanced design concepts and high-precision manufacturing processes.
Application Areas
MTZ Tractors (Minsk Tractor Plant): NSH40M-3 is the standard hydraulic pump for MTZ series tractors including MTZ-80/82, MTZ-320, Belarus series, and more
Kirovets Tractors: Hydraulic systems for Kirovets series large tractors
Combine Harvesters: Rostov, Taganrog, Krasnoyarsk, Kherson, Gomel, Ternopil agricultural machinery plants
Loaders & Forklifts: Hydraulic systems for construction and material handling equipment
Motor Graders & Excavators: Road construction machinery and mini excavators
Municipal & Sanitation Vehicles: Street sweepers, refuse compactors
Forestry & Material Handling Equipment: Forestry machinery and material handling equipment
Industrial Hydraulics: Stationary industrial hydraulic power units
Expert Maintenance Tips
1. Verify Rotation Direction – Right-Hand vs. Left-Hand Are Not Interchangeable
The standard NSH pump is right-hand rotation (clockwise when viewed from the shaft end). Left-hand versions are typically marked as NSH…L. Always confirm the rotation direction of the original pump before installation. Incorrect rotation will cause the pump to fail to supply oil and may quickly damage the unit. Check old pump markings and machine documentation for correct rotation direction.
2. Fluid Cleanliness Control – The Core Factor for Gear Pump Service Life
NSH Series gear pumps are highly sensitive to fluid cleanliness. Dirt, metal particles, water contamination, or incorrect viscosity will accelerate wear on gears and housings, reduce efficiency, and cause leakage. Recommended fluids: mineral and special oils conforming to DIN 51525 standard, with kinematic viscosity of 30–70 mm²/s at +50°C. Before installing a new pump, thoroughly inspect the hydraulic tank, filters, and suction line.
3. Suction Line Design – Preventing Cavitation & Starvation
The suction line must not be restricted, and the pump must never run dry. Suction lines should be as short and straight as possible, avoiding sharp bends and restrictions. Ensure the system is fully primed with oil before first start-up. The NSH Series has a minimum speed of 500 min⁻¹ – avoid operating below this speed during start-up.
4. First Start-Up & Relief Valve Setting
First start-up must be performed with the system filled with oil and the relief valve correctly set. Operating the pump without oil or against a closed pressure line will damage it very quickly. Run the pump at low speed under no load for 2-3 minutes to ensure proper lubrication and air bleeding before gradually applying load.
5. Regular Inspection & Maintenance
Regularly inspect hydraulic fluid cleanliness and viscosity (every 500 hours or per equipment manufacturer recommendations)
Check for abnormal temperature rise or leakage
Monitor for unusual increases in operating noise (may indicate gear wear or bearing failure)
Replace hydraulic fluid and filters regularly to maintain system cleanliness
