HENGYUHANG Hydraulic Power Unit Gear Pump HGP-3A Series

| Overview of HENGYUHANG HGP-3A Series Hydraulic Gear Pumps

The HENGYUHANG HGP-3A Series represents an industry-standard, high-efficiency external positive displacement gear pump engineered specifically for hydraulic power packs, mobile lifting platforms, machine tools, and industrial fluid power systems. Built across 14 finely stepped displacements — ranging from 4.0 cm³/rev up to 35.0 cm³/rev — the HGP-3A pump provides a versatile flow capacity from 7.2 l/min up to 63 l/min at rated 1,800 r/min, accommodating continuous operating pressures up to 210 kgf/cm² (210 bar / 3,000 psi) and peak spike pressures up to 250 kgf/cm² (250 bar / 3,500 psi).

Manufactured with high-tensile extruded aircraft-grade aluminum alloy housings paired with rigid precision-machined front and rear end covers, the pump exhibits outstanding resistance to high cyclic pressure fatigue and structural deformation. The internal power transmission features case-hardened, carburized alloy steel gears with micro-finished tooth profiles that ensure minimal flow pulsation, ultra-quiet running decibels, and exceptional mechanical efficiency. High-load DU composite journal bushings provide self-lubricating hydrodynamic support under continuous load, while advanced hydrostatic pressure-balanced lobe seals dynamically compensate for axial clearances across varying fluid temperatures and operating pressures. This maintains superior volumetric efficiency (≥ 93%) throughout extended duty cycles in demanding industrial and mobile applications.

| Dimension of HENGYUHANG HGP-3A Series Hydraulic Gear Pumps

| Interface Data Needed with the Drawing Across the 14 Models

| Pump Installation Specifications

| Modular Model Ordering Code Structure

HGP−3A−F□□−□−□−□

HGP−3A−[Mounting][Displacement][Rotation]−[Shaft]−[Flange]−[Port]

| Reading Your Replacement Code

Techspecs of HENGYUHANG HGP-3A Series

4.1 Performance Data Across 14 Displacements

4.2 Operating Pressure & Speed Limits

4.3 Fluid & Filtration Specifications

Advantages of HENGYUHANG HGP-3A Series Hydraulic Gear Pumps

Hydrostatic Axial Pressure Clearance Compensation

Equipped with precision bush lobe seals and back-up rings that utilize discharge pressure to provide automatic axial clearance compensation, sustaining high volumetric efficiency (≥93%) over thousands of duty hours.

Carburized Alloy Steel Gears with Micro-Finish Precision

Gears are manufactured from high-grade alloy steel, vacuum carburized, and CNC-ground to ensure minimum flow pulsation, ultra-low operating decibels (<65 dBA at 1,500 rpm), and outstanding wear life.

Extruded High-Tensile Aluminum Alloy Construction

Lightweight yet extremely rigid extruded aluminum body delivers superior power-to-weight ratio (pump weight between 2.29 kg and 3.71 kg), rapid heat dissipation, and excellent fatigue resistance under high-pressure cycling.

Heavy-Duty DU Composite Self-Lubricating Bushings

Advanced PTFE/DU composite journal bearings absorb continuous radial loads with minimal friction, delivering dependable operation under intermittent boundary lubrication and heavy starting torque.

Multi-Flange & Multi-Shaft Modularity

Seamlessly accommodates SAE 2-bolt (2B), European 4-bolt (4BE), and DIN 4-bolt (4BD) mounting interfaces with straight keyed (X1X5), splined (Y1Y5), and tapered (Z1, Z2) shafts to fit any power pack design.

100% Factory Dynamometer Tested

Every manufactured pump undergoes rigorous end-of-line testing for pressure hold, flow output, volumetric efficiency, and internal seal integrity, guaranteeing immediate 1:1 drop-in replacement across international brands.

Reference

6.1 Displacement & Model Matrix

Displacements Available: 4.0, 6.0, 8.4, 11.0, 13.0, 14.3, 16.5, 19.2, 23.0, 25.0, 28.0, 30.0, 33.0, and 35.0 cm³/rev.

• Mounting Configurations:

• 2B: SAE 2-bolt flange (pilot Ø82.55 mm, 2-Ø11 mm holes, 106.4 mm center distance).

• 4BE: European 4-bolt flange (pilot Ø36.5 mm, 4-Ø9 mm holes, 71.4 × 96.2 mm).

• 4BD: DIN 4-bolt flange (pilot Ø80 mm, 4-Ø9 mm holes, 72 × 100 mm).

• L: Foot mounting bracket.

• Drive Shaft Configurations:

• Straight Keyed (X): X1 (Ø15.85 mm), X2 (Ø17.46 mm), X3 (Ø19.05 mm), X4 (Ø20.0 mm), X5 (Ø15.87 mm).

• Splined (Y): Y1 (9T), Y2 (10T), Y3 (11T), Y4 (12T), Y5 (15T).

• Tapered (Z): Z1 (1:8 taper, M12×P1.5), Z2 (1:5 taper, M12×P1.5).

• Port Configurations:

• G (BSPP): G1 (G3/4" in, G1/2" out), G2 (G1" in, G3/4" out).

• P (PT / BSPT): P1 (3/4" in, 1/2" out), P2 (1" in, 3/4" out).

• N (NPT): N1 (3/4" in, 1/2" out), N2 (1" in, 3/4" out).

• U (UNF SAE O-Ring): U1 (1-1/16"-12UNF in, 7/8"-14UNF out), U2 (1-5/16"-12UNF in, 1-1/16"-12UNF out).

• F (Flange): F1, F2, F3 diamond flanged ports; F4, F5, F6 SAE 4-bolt split flange ports.

6.2 Target Brand Interchangeability Matrix

The HENGYUHANG HGP-3A Series offers direct 1:1 functional, hydraulic, and dimensional replacement across premier global gear pump manufacturers:

• HydroMax Hydraulics: 100% direct 1:1 drop-in for HGP-3A Series across all displacements (4 to 35 cc/rev), flange types, and shaft codes.

• RexPower & Winner Hydraulics: Direct interchange for compact AC/DC hydraulic power pack pumps.

• Yuken & Kompass: Complete interchangeability for machine tool lubrication, clamping, and industrial hydraulic power units.

• Casappa (Polaris PLP20 Series): Direct dimensional match on Group 2 European 4-bolt and SAE 2-bolt configurations.

• Marzocchi (ALP2 / GHP2 Series): Direct fitment replacement for Group 2 aluminum gear pumps.

• Parker & Danfoss Group 2: Seamless replacement for mobile aerial platforms, material lifts, and agricultural implement drives.

Brand Replacement & Interchangeability

The HENGYUHANG HGP-3A Series gear pump is built to exact international manufacturing tolerances, ensuring seamless 1:1 mechanical and hydraulic replacement for HydroMax, RexPower, Yuken, and European Group 2 pumps. Every critical mounting parameter—including spigot pilot diameters (Ø82.55 mm for SAE 2B, Ø36.5 mm for European 4BE, Ø80 mm for DIN 4BD), mounting bolt hole spacing, drive shaft extensions (Ø15.85 to Ø20 mm keyed, 9T/10T/11T/15T splined, 1:8/1:5 tapered), and port thread locations—is identical to OEM specifications.

This guarantees effortless drop-in installation onto existing electric motor bell housings, engine PTO mounts, and hydraulic power unit manifold blocks without mechanical alterations, adapters, or hydraulic line modifications. Machinery manufacturers, service repair centers, and fluid power distributors benefit from substantial procurement savings, expedited delivery timelines, and field-proven reliability.

Applications

• Hydraulic Power Packs (AC & DC HPUs): Primary pressure source for compact power units used in industrial automation, lift gates, and mobile power packs.

• Scissor Lifts & Aerial Work Platforms: High-reliability lifting and steering hydraulics for mobile elevating work platforms (MEWPs) and boom lifts.

• Auto Car Lifts & Two-Post / Four-Post Hoists: Standard hydraulic supply for automotive maintenance lifts, wheel alignment racks, and parking systems.

• Dock Levelers & Warehouse Logistics: Hydraulic power for warehouse loading dock levelers, scissor lift tables, and freight elevators.

• Dump Trailers & Light Tippers: Compact hydraulic power supply for 12V/24V DC hydraulic tipping trailers and utility truck bodies.

• Machine Tools & Metalworking Equipment: Lubrication, workpiece clamping, indexing fixtures, and auxiliary hydraulic circuits in CNC milling and lathe centers.

Package & Shipping

Why Choose Hengyuhang?

• Direct Factory Precision Manufacturing & CNC Excellence: Manufactured in our state-of-the-art production plant equipped with high-precision 4-axis and 5-axis CNC machining centers, automated high-speed gear hobbing machines, and precision gear tooth flank grinders (Ra < 0.2 μm) ensuring microscopic internal clearances, ultra-quiet operation, and peak volumetric efficiency.

• 100% Full-Cycle Multi-Parameter Factory Inspection: Every single pump is tested on computerized dynamometer test benches, verifying volumetric efficiency (≥93%), flow output across rated rpm, continuous and peak pressure hold, internal bypass, and sound pressure levels. Zero untested units leave the factory.

• Seamless 1:1 OEM Drop-In Interchangeability: Dimensionally and hydraulically calibrated to global industry standards, guaranteeing direct 1:1 mechanical drop-in replacement across HydroMax, RexPower, Yuken, Casappa, and Marzocchi pumps without piping or bracket modifications.

• Flexible Engineering Customization & Rapid Prototyping: Backed by an experienced fluid power engineering team capable of customizing displacements, non-standard shaft extensions, specialized flange bolt circles, integrated relief valves, and tandem pump configurations with low MOQ requirements and rapid sample turnaround.

• Robust Supply Chain, Extensive Inventory & Fast Global Dispatch: Substantial raw material inventory of extruded high-tensile aluminum profiles, ductile iron castings, hardened gear blanks, and seal kits enables lightning-fast 48–72 hour dispatch for emergency breakdown replacements, supported by complete global export logistics.

• 12-Month Comprehensive Warranty & Lifetime Technical Support: All pumps are backed by our 12-month full-coverage manufacturer warranty against defects in materials and craftsmanship, supplemented by 24/7 technical consultation, 2D/3D CAD model verification, and dedicated fluid power engineering support.