NSH32M-3 Hydrosila Gear Pump 32 cc 160 Bar

Product Overview

The Hydrosila NSH32M-3 MASTER is a 32 cm³/rev fixed-displacement external gear pump designed for hydraulic systems on tractors, agricultural machinery, construction equipment, transport machinery and municipal vehicles.

Hydrosila’s official product page for the NSH 32M-3 MASTER specifies a 32 cm³ working displacement, 160 bar nominal pressure, 210 bar maximum pressure, 3,000 rpm maximum speed, 45.1 L/min nominal delivery, 26.6 kW nominal input power and approximately 3.5 kg weight. The same official source describes a die-cast aluminium-alloy housing and cover, a specially developed pumping unit for reduced noise and pressure pulsation, and metal-fluoroplastic bearings for extended service life.

The MASTER range uses mounting flanges and shafts according to GSTU and GOST standards and is equipped with high-quality NBR seals, with Viton available as an option. Alternative shaft and flange configurations can also be manufactured.

A major advantage for the replacement market is interchangeability. Hydrosila specifically states that MASTER series pumps are fully interchangeable with pumps from the U, UK, G, D and J series.

For replacement projects, we match the original displacement, rotation, shaft, flange, ports and pressure class and conduct 100% simulated working-condition testing before shipment.

Technical Specifications

Hydrosila NSH32M-3 MASTER

• Brand: Hydrosila
• Series: MASTER
• Model: NSH32M-3 / НШ32М-3
• Pump Type: Fixed-displacement external gear pump
• Working Displacement: 32 cm³/rev
• Nominal Pressure: 160 bar
• Maximum Pressure: 210 bar
• Peak Pressure: The MASTER family documentation lists a 250 bar peak-pressure class; however, the specific NSH32M-3 product page identifies 210 bar as its maximum pressure. For this reason, 210 bar is used as the model-specific verified limit.
• Maximum Speed: 3,000 rpm
• Minimum Speed: 500 rpm is listed as the minimum speed for the MASTER family; the actual permissible NSH32M-3 operating point depends on pressure and load.
• Nominal Delivery: 45.1 L/min
• Nominal Input Power: 26.6 kW
• Rotation: Right-hand rotation
• Weight: Approximately 3.5 kg
• Control Method: Fixed displacement
• Housing: Die-cast aluminium alloy
• Bearing Type: Metal-fluoroplastic plain bearings
• Seal Material: NBR; Viton available
• Mounting Standard: GSTU / GOST
• Multi-Section Configuration: Available within the MASTER family
• Shaft and Flange: Standardized according to GSTU/GOST, with alternative configurations available.

Flow and Displacement Engineering

For a fixed-displacement gear pump, theoretical flow can be calculated as:

Qₜ = Vg × n / 1000

Using 32 cm³/rev:

• 1000 rpm: approximately 32 L/min theoretical flow
• 1500 rpm: approximately 48 L/min
• 2000 rpm: approximately 64 L/min
• 2500 rpm: approximately 80 L/min
• 3000 rpm: approximately 96 L/min

These are theoretical displacement-flow values. They must not be confused with the 45.1 L/min nominal delivery specified on the Hydrosila product page. Actual delivered flow is affected by volumetric efficiency, pressure, oil viscosity, temperature and inlet conditions.

Key Technical Advantages

1. Stable 32 cm³/rev Fixed Displacement

The NSH32M-3 provides a 32 cm³/rev working displacement, making it suitable for mobile hydraulic circuits requiring predictable fixed flow. The mechanical simplicity of the external gear design is well suited to agricultural and tractor applications.

2. Die-Cast Aluminium-Alloy Housing

Hydrosila specifies a die-cast aluminium-alloy housing and cover. This construction provides a useful combination of low mass, structural rigidity and repeatable manufacturing quality for mobile machinery.

3. Pumping Unit Optimized for Lower Noise and Pulsation

The official NSH32M-3 description specifically identifies a specially developed pumping unit intended to reduce operating noise and hydraulic pressure pulsation. This is beneficial for tractor lifting and auxiliary circuits where smooth hydraulic behavior is important.

4. Metal-Fluoroplastic Bearing Technology

Metal-fluoroplastic bearings are used to support the gear shafts. Bearing condition and running clearance directly affect mechanical losses, internal leakage and long-term performance. Hydrosila explicitly associates this bearing construction with increased service life.

5. GOST / GSTU Interface Compatibility

The MASTER series uses mounting flanges and shafts according to GSTU and GOST standards, which makes it particularly suitable for replacement applications on Soviet/Russian-standard tractors and agricultural machinery.

6. Broad Legacy-Pump Interchangeability

Hydrosila explicitly states that MASTER series pumps are fully interchangeable with pumps from the U, UK, G, D and J series. This makes the NSH32M-3 particularly valuable for servicing legacy agricultural machinery.

Application Areas

Typical applications identified by Hydrosila include:

• MTZ tractors
• YuMZ tractors
• LTZ tractors
• DT-75
• T-150
• T-25
• Agricultural machinery
• Construction machinery
• Lifting and transport equipment
• Municipal vehicles
• Combine harvesters and mobile machinery

The specific NSH32M-3 product page further lists MTZ 500/800/900 series tractors, 1220/1221/2022 tractors, T-150 equipment, YuMZ machines and several Rostselmash combine harvesters among its applications.

Expert Maintenance Tips

1. Confirm Rotation Before Installation

Rotation determines the suction and discharge sides of an external gear pump. The specific Hydrosila NSH32M-3 product page identifies the pump as right-hand rotation. Always verify rotation from the shaft-end viewing convention and the original machine configuration.

2. Match the Mechanical Interface

Do not select a replacement solely by “32 cc gear pump.” Shaft dimensions, flange drilling, mounting orientation and port geometry must also be verified. Hydrosila states that alternative shafts and flanges can be supplied. (Hydrosila)

3. Protect the Suction Side

At higher speed, inlet demand increases significantly. An undersized suction line, clogged strainer or low reservoir level can cause cavitation, increased noise and reduced delivered flow.

4. Design Around the 160 Bar Rated Pressure

The specific NSH32M-3 product page specifies 160 bar nominal pressure and 210 bar maximum pressure. System relief-valve settings, operating cycles and drive power should be selected around these limits rather than treating 210 bar as a normal continuous operating condition.

5. Maintain Hydraulic Cleanliness

Contamination accelerates wear of gear teeth, bearings and end-clearance surfaces. Keep filtration under control and inspect filter differential pressure regularly to prevent increasing internal leakage.

6. Check Drive Alignment

Tractor gear pumps are commonly driven through PTO, transmission or dedicated coupling systems. Misalignment can increase shaft and bearing loads. Verify drive-axis alignment when installing an NSH32M-3 replacement.