HW-32/50A-3 Series Gear Pump

Overview

The HW-71-100A-3 is a heavy-duty, high-pressure external hydraulic gear pump. This series is primarily engineered to provide hydraulic power for heavy engineering machinery, agricultural tractors (commonly found in Eastern European and Russian markets), wheel loaders, and marine equipment. It is widely recognized for its compact structure, high volumetric efficiency, and exceptional durability.

• Operating Pressure: Rated working pressure is 160 bar (approx. 2320 psi).

• Nominal Displacement: The numbers "71" and "100" designate nominal displacements of 71 mL/r and 100 mL/r respectively.

• Body Material: Constructed from high-strength die-cast aluminum alloy, ensuring excellent pressure resistance while significantly reducing overall weight.

Features and Benefits

• High Efficiency: Uses floating side plates that automatically adjust clearances, preventing internal oil leakage under high pressure.

• Lightweight Build: Features a high-strength die-cast aluminum body, making it compact and light yet highly pressure-resistant.

• Long Lifespan: Designed specifically for harsh working conditions, offering excellent wear resistance, contamination tolerance, and low maintenance needs.

Model Codes

Applications

• Agricultural Machinery (Core Application): Primarily powers MTZ Belarus tractors (e.g., MTZ-80/82/1221) and harvesters (e.g., DON series) to drive three-point hitches, auxiliary steering, and implement controls.

• Construction & Road Equipment: Widely used in mid-sized excavators, wheel loaders, and motor graders (e.g., DZ-98) to operate hydraulic arms, buckets, and blades.

• Dump Trucks & Heavy Commercial Vehicles: Integrates into the hydraulic systems of MAZ, KamAZ, and URAL trucks to supply high-pressure fluid for telescopic dumping cylinders.

• Industrial Auxiliary Systems: Serves as the central fluid power source for stationary hydraulic power packs (HPUs), compactors, and industrial lift platforms.

Packaging & Delivery

Gear Pumps are typically packaged securely to prevent damage during transit. The packaging includes:

Protective Wrapping: To safeguard the high-precision pump body and shaft from moisture and environmental damage.

Custom Cartons or Crates: Individual reinforced packaging with shock-absorbent inserts for single pumps, and sturdy wooden crates for bulk or tandem pump orders to ensure safe handling.

Documentation: Includes technical data sheets, installation guides, and quality inspection certificates.

Delivery time depends on the specific model, port configurations, and destination but typically ranges from 1 to 4 weeks from the order date.

HW-71-100A-3 Series Gear Pump FAQ

• HW: Indicates the specific pump series code (frequently utilized in Eastern European and Russian agricultural and engineering machinery systems).

• 71 / 100: Represents the nominal displacement of the pump, corresponding to 71 mL/r and 100 mL/r respectively.

• A: Designates the specific design series or structural modification code.

• 3: Represents the rated pressure class (this series features a rated pressure of 160 bar / 16 MPa).

• Core Mechanism: It relies on an advanced dual floating compensation system.

• How it works: The pump features tooth-top radial seals combined with pressure-side floating plate axial seals. As working pressure climbs, the hydraulic force pushes the side plates tightly against the gear faces. This action automatically adjusts the axial clearance, preventing high-pressure fluid from leaking back into the low-pressure chamber.

• Recommended Fluids: High-quality mineral-based hydraulic oils (such as anti-wear HM series) or industrial lubricants with comparable lubricating properties.

• Viscosity Range: The ideal operating fluid viscosity should be maintained between 20 and 100 cSt.

• Cleanliness Level: High-pressure gear pumps are sensitive to contaminants. The system filtration accuracy should be at least 25 microns to prevent debris from scratching the floating plates and tooth-top seals.

•  Insufficient system pressure or drop in flow rate.

• Diagnosis: Check if the floating side plates are jammed due to contaminated oil, which prevents automatic clearance compensation. Alternatively, check for heavy wear on the gear faces or the housing interior.

• Overheating or abnormal whining noises.

• Diagnosis: Inspect the suction line for air leaks (which causes cavitation), or verify if the fluid viscosity is too low or the oil temperature is excessively high, leading to poor lubrication.

• Shaft Extension Type: Confirm whether it uses a splined shaft or a keyed shaft, along with the spline count, outer diameter, and module size.

• Mounting Flange: Verify the pilot diameter (the positioning spigot dimension) and the center-to-center distance of the mounting holes.

• Inlet and Outlet Ports: This series typically uses flanged port connections. You must double-check the bolt-hole spacing and thread specifications to ensure a leak-free pipe connection.

FAQ

1.How does the variable displacement work?

The pump's flow is adjusted by changing the angle of an internal swash plate. As the swash plate angle changes, the stroke length of the pistons varies, which in turn changes the volume of fluid displaced per rotation, allowing the flow rate to adapt to the system's needs.

2.What's our advantages?

Factory established in 2005;

With a great deal of production experience;

80+ employees become the professional team;

Constant updated ERP system ensure efficiency of work;

Sophisticated equipment ehanced the accuracy of products;

Professional salesmen provide the greast service;

With a large number of famous customers all over the world;

Great after-sales service;

With the long term cooperation with famous logistics and express company in China,provide the better goods service.

3.What is your payment terms?

Small order/sample order,full payment in advance; Big orders send the first payment 30% before the production,and the balance before shippment.We'll show the photos of the products and packages before delivery.

4.Can you make my own brand on the products?

Of course we can. Just send me your logo  we can make it for you.

5.What is our main export market?

America(40.5%): USA, Canada, Argentina, Brazil

Europe(30.8%): Italy,Germany,England,Holland,Spain,Swiss,Finland,Russia,Poland.

Asia(23.5%): Korea,singapore,India,Turkey,Vietnam,Saudi Arabia,Syria, Israel,Lebanon.

Others(5.8%).

The Green hydraulic pump manufacturing facility is a specialized industrial plant that focuses on producing hydraulic pumps and related components.

These factories are equipped with advanced machinery and technology to fabricate high-quality pumps designed for a wide range of applications,

from heavy equipment and machinery to automotive and industrial systems.

The production process typically involves precision engineering, where raw materials like metals and alloys are processed into pump components such as gears, pistons, cylinders, and seals. These parts are then assembled into fully functional hydraulic pumps, which are tested for performance and quality control to ensure reliability, efficiency, and durability under various working conditions.

Green Hydraulic's manufacturing facilities for hydraulic pumps maintain stringent quality standards,

often adhering to international certifications, to meet the expectations of customers in industries such as construction,

agriculture, automotive, and manufacturing.

All hydraulic pumps produced by Green Hydraulic have undergone compliance testing, ensuring their quality and reliability.

To meet the diverse needs of different industries, the green hydraulic offer customization options, such as specialized seals, materials, and pump configurations. These facilities often work closely with engineering teams to develop tailored solutions for specific applications, from high-pressure systems to low-flow, high-efficiency pumps.

Each pump undergoes a rigorous quality control process, where pressure tests and performance assessments are conducted to ensure that the pumps meet the required standards for flow rate, pressure capacity, and durability.