NSH-100A-3L Hydraulic Gear Pump – 100cc/rev, 16MPa, MTZ Tractor Replacement

Product Overview

The NSH-100A-3L is a high-performance external gear pump from the legendary NSH “Antey” series (Type “A” round-body configuration). Engineered for heavy-duty hydraulic systems in agricultural tractors, bulldozers, and mining dump trucks, this pump enjoys extensive OEM and aftermarket adoption across CIS countries and globally—particularly on MTZ, BELAZ, and EO-series equipment.

As a direct OEM-replacement solution, the NSH-100A-3L guarantees 100% interchangeability with original factory specifications. Every unit undergoes 100% simulated duty-cycle testing to validate volumetric efficiency, thermal performance, and seal integrity under rated load conditions—ensuring reliable operation in dust-laden, high-temperature, and heavy-load environments.

Technical Specifications 

• Model: NSH-100A-3L

• Type: External gear pump (fixed displacement), round-body “A” configuration

• Series: Antey (Type “A” round housing)

• Displacement: 98.8 – 100 cm³/rev

• Rated Pressure: 16 MPa (160 bar)

• Maximum Intermittent Pressure: 21 MPa (210 bar)

• Peak Pressure: 25 MPa (250 bar)

• Rated Speed: 1,920 rpm

• Maximum Speed: 2,400 rpm

• Rated Flow Rate: 173.4 L/min

• Rotation Direction: Left-hand (counterclockwise) – “L” suffix denotes left rotation

• Shaft Type: 6-spline shaft

• Hydraulic Ports: Standard NSH-100 flange interface

• Weight: 16.5 kg

• Housing Material: High-strength cast iron / aluminum alloy (configuration dependent)

• Bearing System: Monolithic sliding bearing block

• Operating Temperature Range: -20°C to +80°C

• Fluid Compatibility: Mineral hydraulic oils, viscosity range 8 – 500 mm²/s

Key Technical Advantages

1. Monolithic Bearing Block Design
The NSH-100A-3L features a unique monolithic sliding bearing block that integrates all bearings into a single, rigid casting. This design significantly enhances bearing rigidity under radial and axial hydraulic loads while minimizing hydraulic stress transmitted to the housing—substantially extending pump service life. Compared to split-bearing configurations, the monolithic design delivers superior reliability in heavy-load, high-dust environments.

2. Exceptional Extreme-Condition Durability
Specifically engineered for construction sites, mining operations, and agricultural fields, this pump maintains stable performance even under suboptimal filtration, fluctuating fluid quality, and extreme ambient temperatures. The sealing system is optimized for high-dust environments, effectively preventing contaminant ingress and preserving the precision of internal gear pairs over extended service intervals.

3. High Volumetric Efficiency & Low Energy Consumption
With precision-ground gear pairs and optimized axial/radial clearance compensation, the NSH-100A-3L achieves volumetric efficiency exceeding 95% across its full operating pressure range. Higher volumetric efficiency translates to reduced internal leakage, lower parasitic power losses, and more economical fuel consumption—a direct and measurable cost-saving advantage for equipment operating extended duty cycles.

4. Lightweight High-Strength Housing
The round “A”-type housing—a signature feature of the Antey series—delivers an optimized power-to-weight ratio without compromising structural integrity. Flow channels within the housing are CFD-optimized to minimize pressure drops and flow-induced noise, ensuring smooth and quiet operation at rated conditions.

5. 100% Drop-In Interchangeability
Manufactured to exact OEM interface standards, with flange dimensions, port configurations, and spline shaft specifications identical to the original NSH-100A-3L. No modifications are required for direct replacement—significantly reducing equipment downtime.

Application Areas

The NSH-100A-3L hydraulic gear pump is widely deployed across the following heavy equipment categories:

• Agricultural Tractors: MTZ series (K-700A, K-701, K-702, K-703, K-744R, and variants)

• Bulldozers & Tracked Vehicles: T-130, T-170, T-170G, and derivatives

• Mining Dump Trucks: BELAZ series

• Excavators: EO-2626, EO-2627, and similar models

• Other Heavy Machinery: MoAZ series, road construction, and municipal equipment

Expert Maintenance Tips

1. Verify Rotation Direction Before Installation
Confirm the rotation direction of the original pump on your equipment. The “L” suffix on NSH-100A-3L denotes left-hand rotation (counterclockwise). If your equipment requires right-hand rotation, select the NSH-100A-3 (without “L” suffix) or the appropriate variant.

2. Prime the Pump Before First Start
Fill the pump cavity with clean hydraulic fluid through the suction port prior to initial startup. Dry-starting will cause rapid wear to gears and bearings under unlubricated conditions, potentially leading to catastrophic pump failure.

3. Maintain Fluid Cleanliness
Although the NSH-100A-3L offers high tolerance to fluid quality variations, for optimal service life we recommend a minimum filtration level of ISO 4406 19/17/14. Regularly inspect filter elements to prevent particulate contamination from accelerating gear and bearing wear.

4. Monitor Operating Temperature
Under normal operation, pump housing surface temperature typically runs 10–20°C above the tank oil temperature. Keep housing surface temperature below 80°C and system oil temperature within the 15–65°C range. If temperatures exceed these limits, inspect the cooling system or fluid viscosity.

5. Periodic Torque Check on Mounting Bolts
Given the pump’s common use in high-vibration equipment, we recommend checking mounting bolt and flange bolt torque every 500 operating hours to prevent loosening-induced leakage or misalignment.