Product Overview
The NSH-100A-3L is the flagship large-displacement model of the NSH series hydraulic gear pumps, manufactured in strict accordance with GOST standards. It is widely used in hydraulic systems of MTZ tractors, K-700/K-701, T-170/T-130, BELAZ heavy-duty vehicles, and EO-series excavators. Featuring a high-strength aluminum alloy housing, the pump delivers an excellent power-to-weight ratio while maintaining exceptional reliability.
As the core power component in MTZ tractor hydraulic systems, the NSH series gear pump directly impacts the reliability and efficiency of critical functions including lifting, steering, and braking. The NSH-100A-3L is specifically designed as the “A” reinforced version, ideal for heavy-duty applications requiring high flow output. The suffix “3L” denotes pressure version Group 3 (16 MPa rated / 20 MPa peak) with left-hand rotation.
We specialize in the R&D and manufacturing of high-pressure pumps, motors, and valve groups. The NSH-100A-3L offers 100% direct interchangeability with original NSH-100A-3 and NSH-100A-3L pumps—no modification required. Every unit undergoes 100% simulated load testing before shipment, ensuring performance validation under real-world operating conditions.
Technical Specifications
Model: NSH-100A-3L (Left Rotation)
Displacement: 100 cm³/rev
Maximum Continuous Pressure (P₁) : 160 bar
Maximum Intermittent Pressure (P₂) : 210 bar
Maximum Peak Pressure (P₃) : 250 bar
Maximum Speed: 3600 min⁻¹
Minimum Speed: 500 min⁻¹
Pressure Version: Group 3 (16 MPa rated / 20 MPa peak)
Rotation Direction: Left-hand (counter-clockwise), indicated by “L” suffix
Housing Material: High-strength aluminum alloy
Pump Type: External gear pump
Fluid Media: Mineral hydraulic oil
Recommended Viscosity: ≥55 cSt
Flow Rate at Rated Speed: Approx. 145 L/min (1450 rpm × 100 cc/rev)
Compatible Equipment: MTZ tractors, K-700/K-701, T-170/T-130, BELAZ, EO-2626 excavators, and more
Key Technical Advantages
1. High-Precision Machining for Superior Volumetric Efficiency
The NSH-100A-3L is manufactured using high-precision CNC machining centers with严格控制 gear meshing clearances. This precision minimizes internal leakage, significantly enhancing both volumetric and mechanical efficiency. Under rated operating conditions, pump efficiency reaches 81% or higher. Rigorous manufacturing tolerances ensure consistency and reliability across every unit.
2. High-Strength Aluminum Alloy Housing—Lightweight Yet Durable
The pump body is constructed from specialized high-strength aluminum alloy, significantly reducing overall weight while maintaining excellent structural integrity and corrosion resistance. The lightweight design simplifies installation and maintenance while reducing overall energy consumption. The housing design充分考虑 thermal expansion coefficient matching, ensuring stable operation across a wide temperature range from -30°C to +120°C.
3. Long-Life Bearing Design for Continuous Heavy-Duty Operation
The NSH-100A-3L features high-load-capacity plain bearings installed in a robust integrated assembly, effectively resisting high hydraulic loads and ensuring long-term stable operation under continuous heavy-duty conditions. Optimized bearing lubrication channels guarantee sufficient lubrication even during cold starts or high-viscosity conditions, significantly extending pump service life.
4. Low-Noise Operation for Enhanced Operator Comfort
Precisely engineered gear profiles and optimized housing flow channels effectively reduce fluid pulsation and pressure fluctuations, keeping noise levels low during operation. This low-noise characteristic not only improves the working environment for equipment operators but also reflects the engineering excellence embedded in every detail of the product.
Application Areas
MTZ Series Tractors (MTZ-80/82 and later models)—hydraulic systems for lifting, steering, and braking
Kirovets K-700/K-701/K-702/K-703 heavy-duty tractors
T-130/T-170 Series Bulldozers—hydraulic implement systems
BELAZ Mining Trucks—auxiliary hydraulic systems
EO-2626/EO-2621 Excavators—hydraulic systems
Agricultural Combines and Municipal Engineering Machinery
Expert Maintenance Tips
1. Verify Rotation Direction Before Installation
Confirm the drive shaft rotation direction prior to installation. The “L” suffix on NSH-100A-3L indicates left-hand (counter-clockwise) rotation. Mismatched rotation direction will cause immediate pump failure and may introduce metal particles into the entire hydraulic system, damaging control valves and seals. Double-check the original pump’s model designation before proceeding.
2. Coupling Alignment Requirements
Ensure shaft concentricity between the pump and drive shaft is within 0.05 mm during installation. Excessive misalignment will cause premature bearing wear, seal leakage, or even shaft fracture. Flexible couplings are recommended to compensate for minor alignment deviations.
3. Suction Line Sealing Inspection
NSH series gear pumps are sensitive to suction resistance. Ensure the suction line is properly sealed with no air leaks, and the suction filter is not clogged. Recommended suction vacuum does not exceed 0.3 bar (absolute pressure). Select line diameter appropriately based on flow rate to avoid cavitation damage from insufficient oil supply.
4. First-Start Priming Procedure
After new pump installation or system overhaul, perform priming before first start. Jog the pump at low speed and low pressure until the pump body is fully filled with oil and air is purged, then gradually increase to rated speed and working pressure. Running the pump dry will cause irreversible damage to gears and bearings due to metal-to-metal contact.
5. Regular Oil and Filter Changes
Replace hydraulic oil and return filters every 1,000 operating hours or per equipment manufacturer recommendations. Using hydraulic oil with cleanliness not lower than ISO 4406 18/16/13 will significantly extend pump service life. Monitor pump body temperature regularly; if it consistently exceeds +80°C, inspect the system cooling and relief valve settings.
