Gear pump
HENGYUHANG Hydraulic Power Unit Gear Pump HGP-2A Series
Engineered with high-tensile extruded aluminum alloy body, precision-ground hardened alloy steel gears, and self-compensating bush lobe balance seals, the HENGYUHANG HGP-2A Series hydraulic gear pump delivers exceptional volumetric efficiency (≥ 93%), ultra-low operating noise, and dependable fluid power with working pressure up to 210 kgf/cm² (210 bar / 3,000 psi) and maximum peak pressure up to 250 kgf/cm² (250 bar / 3,500 psi).
| Applications
Designed specifically for compact AC/DC hydraulic power packs (HPUs), mobile equipment, and industrial machinery, the HGP-2A Series powers truck tail lifts, hydraulic scissor lifts, aerial work platforms, auto car lifts, dock levelers, dump trailers, machine tool lubrication, and agricultural machinery. Featuring standardized JIS 4-bolt (4BJ) mounting flanges with tang drive (W), straight keyed (X), splined (Y), and tapered (Z) shafts alongside versatile threaded (G/P) and flanged (F1) ports, it provides direct 1:1 drop-in interchangeability across global hydraulic systems.
| Key Technical Specifications
Product Model: Hengyuhang Hydraulic Power Unit Gear Pump HGP-2A Series
Brand Replacement: HydroMax, RexPower, Yuken, Kompass, Winner, Shimadzu, Casappa, Marzocchi, Parker OEM or as requested.
Displacement: 2.0 to 12.0 cm³/rev across 10 standardized models (HGP-2A-2, 2.5, 3, 4, 5, 6, 8, 9, 11, 12)
Rotation Direction: Clockwise (R) and counter-clockwise (L) (viewed looking at drive shaft end)
Speed Range: Minimum speed 500 to 1,000 r/min; Rated speed 1,800 r/min; Maximum permissible speed up to 2,000 to 5,000 r/min
Peak Pressure: Rated working pressure 175 to 210 kgf/cm² (175 to 210 bar); Maximum peak pressure up to 250 kgf/cm² (250 bar / 3,500 psi)
- Description
- Tecspecs
- Brand & Reference
- Download HENGYUHANG HGP-2A Hydraulic Power Unit Gear Pump PDF
- Send an Inquiry
| Overview of HENGYUHANG HGP-2A Series Hydraulic Gear Pumps
The HENGYUHANG HGP-2A Series represents an industry-standard, high-efficiency external positive displacement gear pump engineered specifically for mini and micro hydraulic power packs, truck tail lifts, mobile aerial platforms, machine tools, and industrial fluid power systems. Built across 10 finely stepped displacements — ranging from 2.0 cm³/rev up to 12.0 cm³/rev — the HGP-2A pump delivers smooth flow rates from 3.6 l/min up to 21.6 l/min at rated 1,800 r/min, accommodating continuous working 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 while keeping the overall pump weight extremely compact (between 1.69 kg and 1.76 kg). 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-2A Series Hydraulic Gear Pumps
| Interface Data Needed with the Drawing Across the 10 Models
| Interface / Feature Item | Engineering Specification & Dimensional Callout | Standard Options & Details |
|---|---|---|
| Mounting Flange Option 1 | Code 4BJ — JIS 4-Bolt Flange | Pilot spigot diameter: Ø 50.8 mm (+0 / −0.05 mm); Spigot height: 3.8 mm; Square bolt spacing: 63.5 mm × 63.5 mm; Flange overall width: 80 mm × 80 mm (diagonal 102 mm); Mounting through-holes: 4-Ø 8.8 mm / 4-Ø 9 mm |
| Mounting Flange Option 2 | Code L — Foot Bracket Mounting | Heavy-duty foot mounting bracket for direct baseplate or electric motor pedestal installation |
| Drive Shaft Option 1: Tang Drive | Code W1 — Flat Drive Tang Shaft | Tang blade thickness: 6.8 mm; Tang blade width: 13.5 mm; Spigot extension length: 11 mm (total extension 12.7 mm / 15 mm); Standard interface for compact AC/DC power pack motor bell housings |
| Drive Shaft Option 2: Straight Keyed | Code X1 — Straight Cylindrical Keyed Shaft | Shaft diameter: Ø 12.50 mm (+0 / −0.02 mm); Woodruff key size: 4 × 16 mm; Keyway height: 14.0 mm (+0 / −0.2 mm); Shaft extension length: 30 mm (overall from flange face 33.8 mm) |
| Drive Shaft Option 3: Splined | Code Y1 — Involute Splined Shaft | Spline specification: 12T × 16/32DP × 30° pressure angle; Spline length: 32 mm (overall from flange face 35 mm) |
| Drive Shaft Option 4: Tapered | Code Z1 — 1:8 Taper Shaft | Taper ratio: 1:8; Threaded end: M8 × P1.25 with hex nut and lock washer; Woodruff key size: 3 × 13 mm; Shaft extension length: 35.5 mm |
| Threaded Ports Option 1 (PT / BSPT) | Code P (P1, P2) | P1 (2–12 cc): Inlet 3/8" PT, Outlet 3/8" PT; P2 (2–12 cc): Inlet 1/2" PT, Outlet 1/2" PT |
| Threaded Ports Option 2 (G / BSPP / PF) | Code G (G1, G2) | G1 (2–12 cc): Inlet G 3/8", Outlet G 3/8"; G2 (2–12 cc): Inlet G 1/2", Outlet G 1/2" |
| Flanged Ports Option (F1) | Code F1 — Diamond Flanged Ports | Inlet: Ø 14.5 mm orifice with diamond 2-bolt circle 35 mm (M6 thread); Outlet: Ø 14.5 mm orifice with diamond 2-bolt circle 35 mm (M6 thread) |
| Side Pad Port Mounting Threads | Metric Threaded Holes on Body Side | 8 × M6 × P1.0 threaded holes on body side for secure bolt-on port flange pad attachments |
| Direction of Rotation | Code R (Right / CW) or L (Left / CCW) | R: Clockwise viewed looking at drive shaft end; L: Counter-clockwise |
| Pump Installation Specifications
| Modular Model Ordering Code Structure
HGP−2A−F−□−□−□−4BJ−□
HGP−2A−[Mounting]−[Displacement]−[Rotation]−[Shaft]−[Flange]−[Port]
| Position / Segment | Code Element | Description & Available Options |
|---|---|---|
| 1. Model Series | HGP-2A | High-performance compact hydraulic power pack gear pump series |
| 2. Mounting Type | F, L | F = Flange mounting type (standard); L = Foot bracket mounting type |
| 3. Delivery Capacity | 2 to 12 | Nominal displacement (cm³/rev): 2 = 2.0; 25 = 2.5 (custom); 3 = 3.0; 4 = 4.0; 5 = 5.0 (custom); 6 = 6.0; 8 = 7.5; 9 = 9.0; 11 = 10.5; 12 = 12.0 |
| 4. Rotation Direction | R, L | R = Clockwise (viewed looking at drive shaft); L = Counter-clockwise |
| 5. Drive Shaft Type | W, X, Y, Z | W1 = Tang drive shaft (6.8 mm tang); X1 = Straight cylindrical keyed shaft (Ø 12.50 mm); Y1 = Involute splined shaft (12T × 16/32DP × 30°); Z1 = Tapered shaft (1:8 taper with M8 × P1.25 nut) |
| 6. Flange Mounting Type | 4BJ | 4BJ = JIS 4-bolt flange (pilot Ø 50.8 mm, square 63.5 × 63.5 mm) |
| 7. Inlet & Outlet Port Type | G, P, F | G (G1, G2) = BSPP/G internal thread (G3/8" or G1/2"); P (P1, P2) = PT/BSPT taper thread (3/8" PT or 1/2" PT); F1 = Diamond flanged ports (Ø14.5 mm with M6 bolt circle) |
| Reading Your Replacement Code
| Target Brand & Part Number | HENGYUHANG HGP-2A Equivalent | Fitment & Direct Interchange Verification |
|---|---|---|
| HydroMax HGP-2A-F-6-R-W1-4BJ-P2 | HGP-2A-F-6-R-W1-4BJ-P2 | 100% exact 1:1 drop-in replacement: 6.0 cc/rev, JIS 4BJ flange, tang shaft W1, 1/2" PT ports |
| HydroMax HGP-2A-F-8-R-W1-4BJ-G2 | HGP-2A-F-8-R-W1-4BJ-G2 | Direct fit for 7.5 cc/rev truck tail lift and auto lift power packs, G1/2" ports, tang drive |
| HydroMax HGP-2A-F-4-R-X1-4BJ-P1 | HGP-2A-F-4-R-X1-4BJ-P1 | Exact match: 4.0 cc/rev, JIS 4-bolt flange, straight shaft Ø12.50 mm, 3/8" PT ports |
| HydroMax HGP-2A-F-12-R-W1-4BJ-P2 | HGP-2A-F-12-R-W1-4BJ-P2 | High-displacement 12.0 cc/rev power unit pump, rated 175 kgf/cm² (175 bar / 2,500 psi) |
| RexPower HGP-2A-F-3-R-Z1-4BJ-F1 | HGP-2A-F-3-R-Z1-4BJ-F1 | 3.0 cc/rev, 1:8 taper shaft Z1 with M8 nut, diamond flanged ports F1 |
| Yuken / Kompass HGP-2A Series | HGP-2A Series (Matching Code) | Exact dimensional pilot, bolt pattern, and displacement parity across machine tool power packs |
| Winner / Monarch / Haldex HPU Pump | HGP-2A-F-W1-4BJ Series | Standard replacement for compact DC/AC power packs with tang drive motor coupling |
| Casappa Polaris PLP10 Series | HGP-2A Series (Custom Spec) | Equivalent displacement and pressure performance across Group 1 compact applications |
Techspecs of HENGYUHANG HGP-2A Series
4.1 Performance Data Across 10 Displacements
| Model Number | Accurate Displacement (cc/rev) | Operational Pressure (kgf/cm² / bar) | Maximum Pressure (kgf/cm² / bar) | Rated Speed (r/min) | Maximum Speed (r/min) | Minimum Speed (r/min) | Flow at Rated Speed (l/min) | Pump Weight (kg) |
|---|---|---|---|---|---|---|---|---|
| HGP-2A-2 | 2.0 | 210 / 210 | 250 / 250 | 1,800 | 5,000 | 1,000 | 3.6 | 1.69 |
| HGP-2A-25 | 2.5 | 210 / 210 | 250 / 250 | 1,800 | 5,000 | 850 | 4.5 | 1.70 |
| HGP-2A-3 | 3.0 | 210 / 210 | 250 / 250 | 1,800 | 5,000 | 850 | 5.4 | 1.70 |
| HGP-2A-4 | 4.0 | 210 / 210 | 250 / 250 | 1,800 | 4,500 | 800 | 7.2 | 1.71 |
| HGP-2A-5 | 5.0 | 210 / 210 | 250 / 250 | 1,800 | 3,500 | 700 | 9.0 | 1.71 |
| HGP-2A-6 | 6.0 | 210 / 210 | 250 / 250 | 1,800 | 3,500 | 700 | 10.8 | 1.72 |
| HGP-2A-8 | 7.5 | 210 / 210 | 250 / 250 | 1,800 | 3,000 | 600 | 13.5 | 1.74 |
| HGP-2A-9 | 9.0 | 210 / 210 | 250 / 250 | 1,800 | 2,500 | 550 | 16.2 | 1.74 |
| HGP-2A-11 | 10.5 | 210 / 210 | 250 / 250 | 1,800 | 2,000 | 500 | 18.9 | 1.74 |
| HGP-2A-12 | 12.0 | 175 / 175 | 210 / 210 | 1,800 | 2,000 | 500 | 21.6 | 1.76 |
Note: Models HGP-2A-25 (2.5 cc/rev) and HGP-2A-5 (5.0 cc/rev) are specialized configurations; customized production service is readily provided upon request.
4.2 Operating Pressure & Speed Limits
| Parameter | Permissible Operational Limit | Engineering Operating Conditions |
|---|---|---|
| Rated Operational Pressure | 175 to 210 kgf/cm² (17.5 to 21.0 MPa) | Continuous permissible working pressure (210 bar for 2–11 cc; 175 bar for 12 cc) |
| Maximum Peak Pressure | 210 to 250 kgf/cm² (21.0 to 25.0 MPa / up to 3,500 psi) | Permissible transient pressure spikes during intermittent cycle peaks |
| Speed Range Limits | 500 to 5,000 r/min | Rated operating speed: 1,800 r/min; max speed up to 5,000 r/min on small frames |
| Suction Port Inlet Pressure | −0.03 to +0.03 MPa (−0.3 to +0.3 bar) | Measured at pump inlet to ensure complete self-priming without cavitation |
| Volumetric Efficiency | ≥93% | Maintained across rated speeds with optimal fluid viscosity |
4.3 Fluid & Filtration Specifications
| Parameter | Permissible Operating Limits | Optimal Recommended Target |
|---|---|---|
| Recommended Hydraulic Fluid | Anti-wear mineral hydraulic oil (ISO VG 32 / VG 46 / VG 68; HM / HV) | High-quality HM 46 anti-wear hydraulic oil |
| Operating Viscosity Range | ν=10 to 300 mm²/s (cSt) | νₒₚₜ=20 to 50 mm²/s (cSt) |
| Operating Fluid Temperature | −15 ∘C to +80 ∘C (+5 ∘F to +176 ∘F) | +30 ∘C to +55 ∘C (+86 ∘F to +131 ∘F) |
| Filtration Rating (Suction Line) | ≤100 μm wire mesh suction filter | Protects against coarse particulate contamination |
| Filtration Rating (Pressure / Return) | ≤25 μm (β₂₅≥75) | Target fluid cleanliness: ISO 4406 Class 19/16 |
Advantages of HENGYUHANG HGP-2A 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 (<62 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 1.69 kg and 1.76 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-Shaft & Multi-Port Modularity
Standardized JIS 4-bolt (4BJ) mounting interface accommodates tang drive (W1), straight keyed (X1), splined (Y1), and tapered (Z1) shafts alongside PT, BSPP, and flanged ports to fit any compact 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: 2.0, 2.5, 3.0, 4.0, 5.0, 6.0, 7.5, 9.0, 10.5, and 12.0 cm³/rev.
Mounting Configuration:
4BJ: JIS 4-bolt flange (pilot Ø50.8 mm, 4-Ø8.8/Ø9 mm holes, 63.5 × 63.5 mm square bolt pattern).
L: Foot mounting bracket.
Drive Shaft Configurations:
Tang Drive (W1): 6.8 mm blade width, 13.5 mm depth, standard compact power unit coupling.
Straight Keyed (X1): Ø12.50 mm (+0/−0.02), woodruff key 4×16 mm, length 30 mm.
Splined (Y1): 12T × 16/32DP × 30° pressure angle, length 32 mm.
Tapered (Z1): 1:8 European taper, M8×P1.25 threaded end with nut, woodruff key 3×13 mm.
Port Configurations:
P (PT / BSPT): P1 (Inlet 3/8" PT, Outlet 3/8" PT), P2 (Inlet 1/2" PT, Outlet 1/2" PT).
G (G / BSPP / PF): G1 (Inlet G 3/8", Outlet G 3/8"), G2 (Inlet G 1/2", Outlet G 1/2").
F1 (Flange): Inlet Ø14.5 mm (bolt circle 35 mm, M6), Outlet Ø14.5 mm (bolt circle 35 mm, M6).
6.2 Target Brand Interchangeability Matrix
The HENGYUHANG HGP-2A 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-2A Series across all displacements (2 to 12 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.
Monarch / Haldex / Concentric: Direct replacement for compact 12V/24V DC power unit pumps with tang drive (W1).
Shimadzu & Kayaba Group 1: Direct replacement for small industrial and mobile auxiliary pumps.
Casappa (Polaris PLP10 Series): Direct functional and displacement match across Group 1 industrial applications.
Marzocchi (ALP1 / GHP1 Series): Direct fitment replacement for Group 1 aluminum gear pumps.
Brand Replacement & Interchangeability
The HENGYUHANG HGP-2A 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 1 pumps. Every critical mounting parameter—including spigot pilot diameter (Ø50.8 mm for JIS 4BJ), square 4-bolt pattern (63.5 mm × 63.5 mm), drive shaft extensions (tang drive W1, straight shaft Ø12.50 mm X1, 12T splined Y1, 1:8 tapered Z1), and port thread locations—is identical to OEM specifications.
This guarantees effortless drop-in installation onto existing electric motor bell housings, DC motor power units, and hydraulic 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
Compact Hydraulic Power Packs (AC & DC HPUs): Primary pressure source for mini power packs used in lift tables, mobile cranes, and compact hydraulic power units.
Truck Tail Lifts & Vehicle Lift Gates: Hydraulic lifting and lowering power for commercial truck hydraulic tailgates and handicap van access ramps.
Small Scissor Lifts & Aerial Work Platforms: High-reliability lifting hydraulics for micro scissor lifts and self-propelled aerial work platforms.
Auto Car Lifts & Motorcycle Lifts: Standard hydraulic supply for low-rise automotive service lifts, tire changers, and motorcycle lifting racks.
Dock Levelers & Warehouse Logistics: Hydraulic power for warehouse loading dock levelers, scissor lift tables, and freight platform lifters.
Machine Tools & Automation Equipment: Lubrication, workpiece clamping, indexing fixtures, and auxiliary hydraulic circuits in compact metalworking machines.
Package & Shipping
| Packaging Construction | Individual heavy-duty reinforced corrugated carton with custom-molded shockproof EPE foam inserts; batch wholesale shipments packed in standard export fumigation-free wooden crates |
| Corrosion Protection | Internal test fluid coating, external corrosion-inhibiting treatment, and heat-sealed vapor corrosion inhibitor (VCI) plastic enclosure |
| Port & Shaft Protection | Custom heavy-duty plastic threaded plugs for all inlet and outlet ports, and rigid protective plastic sleeves for drive shaft extensions |
| Individual Pump Weight | 1.69 kg (HGP-2A-2) up to 1.76 kg (HGP-2A-12) |
| Standard Dispatch Lead Time | Standard catalog models dispatched within 48–72 hours from warehouse inventory; volume custom OEM batches dispatched in 10–15 business days |
| Global Shipping Options | Air express delivery (DHL, FedEx, UPS, TNT) for urgent maintenance; Ocean container (FCL/LCL) and dedicated Air freight for volume commercial distributors |
| Export Documentation | Factory dynamometer quality inspection certificate, CE conformity documentation, and customized OEM private-label branding supported |
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.
HENGYUHANG Hydraulic Power Unit Gear Pump HGP-2A Series (High-Pressure External Micro Hydraulic Gear Pump, 2.00~12.00 cc/rev) is a high-performance, compact external hydraulic gear pump engineered specifically for modular AC and DC hydraulic power packs, mini hydraulic power units (HPU), automotive tail lifts, and light mobile lifting systems. Manufactured by Quanzhou Hengyuhang Power Technology Co., Ltd., the HGP-2A Series features a high-strength extruded aluminum alloy body paired with precision-machined cast iron front and rear covers, high-grade alloy steel case-hardened gear sets, and heavy-duty DU composite self-lubricating sleeve bushings. The pump utilizes an optimized pressure-balanced bush lobe seal and elastomeric back-up ring compensation system that provides automatic axial and radial clearance compensation, ensuring sustained high volumetric efficiency (≥ 92%), minimal internal bypass slip, and smooth, low-noise fluid delivery across continuous high-pressure duty cycles. Operating at nominal continuous working pressures up to 210 kgf/cm² (21 MPa / 210 bar / 3,000 psi) and maximum peak pressures up to 250 kgf/cm² (25 MPa / 250 bar / 3,500 psi), the HGP-2A Series spans 10 standardized displacement ratings—2.0, 2.5, 3.0, 4.0, 5.0, 6.0, 7.5, 9.0, 10.5, and 12.0 cc/rev (mL/r)—with maximum drive speeds reaching up to 5000 r.p.m. Designed for standardized integration into electric motor center manifolds and modular power unit blocks, the pump incorporates a standard JIS 4-bolt mounting flange (Code 4BJ: centering pilot Ø50.8 mm, 63.5 × 63.5 mm bolt pattern), versatile drive shaft options including slotted tang shaft (W1), straight keyed shaft (X1: Ø12.50 mm), involute splined shaft (Y1: 12T), and 1:8 tapered shaft (Z1), alongside multi-standard fluid porting configurations (diamond flange F1, G/BSPP threaded G1~G2, and PT/BSPT threaded P1~P2), delivering a reliable, vibration-resistant fluid power solution for car lift manufacturers, electric stacker builders, scissor lift platforms, and industrial automation equipment.
| Applications
The HGP-2A Series hydraulic power pack gear pump is engineered for compact, high-pressure fluid power systems across stationary industrial power units and mobile material handling equipment:
Automotive Lifts & Two-Post / Four-Post Car Hoists: Serves as the primary hydraulic pressure pump in dedicated AC electric power packs for vehicle workshop hoists, parking lifts, and alignment racks.
Aerial Work Platforms & Mobile Mini Scissor Lifts: Powers platform elevation, steering, and outrigger deployment circuits on DC battery-powered self-propelled scissor lifts and push-around vertical personnel lifts.
Commercial Vehicle Tailgate Lifts & Ramp Levelers: Drives electro-hydraulic power packs for truck rear tail lifts, wheelchair accessibility ramps, and warehouse hydraulic dock levelers.
Electric Stackers & Warehouse Material Handlers: Delivers compact, high-efficiency fluid power for mast lifting and tilting on pedestrian pallet stackers, electric walkie trucks, and mini order pickers.
Agricultural & Lawn Utility Equipment: Powers compact hydraulic implements, lawn mower deck height adjusters, small tractor three-point hitches, and auxiliary wood splitters.
Industrial Clamping Units & Automation Fixtures: Supplies continuous, dependable hydraulic pressure for CNC machine tool workpiece clamping packs, hydraulic crimping machines, and small hydraulic presses.
| Key Specifications Overview
| Parameter | Hengyuhang HGP-2A Series Engineering Specification |
|---|---|
| Pump Architecture | High-Pressure External Hydraulic Gear Pump for Modular Hydraulic Power Units (HGP-2A Series) |
| Displacement Frame Ratings | 10 Standard Displacements: 2, 2.5, 3, 4, 5, 6, 7.5, 9, 10.5, and 12 cc/rev (mL/r) |
| Operational Rated Working Pressure | 210 kgf/cm² (21 MPa / 210 bar / 3,000 psi) for sizes 2~11; 175 kgf/cm² (17.5 MPa / 175 bar / 2,500 psi) for size 12 |
| Maximum Peak Operating Pressure | 250 kgf/cm² (25 MPa / 250 bar / 3,500 psi) for sizes 2~11; 210 kgf/cm² (21 MPa / 210 bar / 3,000 psi) for size 12 |
| Volumetric Efficiency Rating | ≥ 92% under rated pressure and speed with automatic bush lobe pressure balance compensation |
| Rotational Speed Range | Rated: 1800 r.p.m. across all models; Maximum: 2000 to 5000 r.p.m.; Minimum: 500 to 1000 r.p.m. |
| Body & Housing Construction | High-tensile extruded aluminum alloy gear housing with rigid heavy-duty cast iron front and rear end covers |
| Gear & Shaft Engineering | Integral drive and driven gears manufactured from case-hardened high-purity alloy steel with precision-ground tooth profiles |
| Bushing & Bearing System | Heavy-duty DU composite self-lubricating PTFE/bronze sleeve bushings providing high radial load capacity and minimal startup friction |
| Clearance Compensation Technology | Specialized bush lobe seals with elastomeric back-up rings providing automatic axial pressure balance to eliminate internal bypass slip |
| Mounting Flange Standards | Code 4BJ: JIS 4-bolt Flange (Centering pilot Ø50.8 mm +0/-0.05 mm, 3.8 mm pilot height, 63.5 × 63.5 mm bolt pattern, 4 × Ø8.8 / Ø9 mm holes) |
| Drive Shaft Configurations | Code W1: Slotted Tang Shaft (11 × 6.8 mm); Code X1: Straight Keyed (Ø12.50 mm); Code Y1: Spline (12T × 16/32 DP × 30°); Code Z1: Taper 1:8 (M8 × P1.25) |
| Fluid Port Connections | Flange: Diamond F1 (Inlet 35 mm / Ø14.5 mm M6, Outlet 35 mm / Ø14.5 mm M6); Threaded: G (BSPP G 3/8"~G 1/2"); PT (BSPT 3/8"~1/2" PT) |
| Direction of Rotation | Clockwise (Code R, viewed facing shaft, standard/default) or Counter-Clockwise (Code L) |
| Unit Weight Range | Ultra-lightweight compact packaging: 1.69 kg (Size 2) to 1.76 kg (Size 12) |
| Hydraulic Fluid Compatibility | Premium anti-wear mineral hydraulic oils (ISO VG 32, 46, 68; DIN 51524 HLP); Viscosity range: 10 to 300 mm²/s (cSt); Temp: -15°C to +80°C |
| Fluid Cleanliness Standard | ISO 4406 Class 19/16 minimum (NAS 1638 Class 10; 25 μm suction filtration recommended to protect DU bushings and gear teeth) |
| Technical Performance Matrix Across Available Sizes
| Model Number | Accurate Displacement (cc/rev) | Operating Pressure (kgf/cm² / bar) | Rotational Speed (r.p.m.) | Theoretical Delivery Flow (L/min) | Unit Mass (kg, approx) | ||||
|---|---|---|---|---|---|---|---|---|---|
| Operational (Rated) | Max. Peak | Rated | Max. | Min. | @ 1500 r.p.m. | @ 1800 r.p.m. | |||
| HGP-2A-2 | 2.0 | 210 / 210 | 250 / 250 | 1800 | 5000 | 1000 | 3.0 | 3.6 | 1.69 |
| HGP-2A-25 | 2.5 | 210 / 210 | 250 / 250 | 1800 | 5000 | 850 | 3.75 | 4.5 | 1.70 |
| HGP-2A-3 | 3.0 | 210 / 210 | 250 / 250 | 1800 | 5000 | 850 | 4.5 | 5.4 | 1.70 |
| HGP-2A-4 | 4.0 | 210 / 210 | 250 / 250 | 1800 | 4500 | 800 | 6.0 | 7.2 | 1.71 |
| HGP-2A-5 | 5.0 | 210 / 210 | 250 / 250 | 1800 | 3500 | 700 | 7.5 | 9.0 | 1.71 |
| HGP-2A-6 | 6.0 | 210 / 210 | 250 / 250 | 1800 | 3500 | 700 | 9.0 | 10.8 | 1.72 |
| HGP-2A-8 | 7.5 | 210 / 210 | 250 / 250 | 1800 | 3000 | 600 | 11.25 | 13.5 | 1.74 |
| HGP-2A-9 | 9.0 | 210 / 210 | 250 / 250 | 1800 | 2500 | 550 | 13.5 | 16.2 | 1.74 |
| HGP-2A-11 | 10.5 | 210 / 210 | 250 / 250 | 1800 | 2000 | 500 | 15.75 | 18.9 | 1.74 |
| HGP-2A-12 | 12.0 | 175 / 175 | 210 / 210 | 1800 | 2000 | 500 | 18.0 | 21.6 | 1.76 |
| Mounting Flange, Drive Shaft and Fluid Port Configurations
| Feature Element | Code & Type Designation | Engineering Specifications & Dimensional Standards |
|---|---|---|
| Mounting Flange | Code 4BJ: JIS 4-Bolt Flange | Centering spigot pilot: Ø50.8 mm (+0 / -0.05 mm tolerance); Spigot pilot depth: 3.8 mm; Symmetrical 4-bolt square pattern: 63.5 mm × 63.5 mm; Bolt through-holes: 4 × Ø8.8 / Ø9 mm; Overall square flange width: 80 mm × 80 mm (102 mm across diagonal corners); Total pump body length: 102.5 mm; Port center position from flange face: 43.7 mm; Port center spacing: 50.4 mm (25.2 mm from centerline). |
| Slotted Tang Shaft (W1) | Code W1: Tang Drive Paddle (Flat Spade) | Drive blade width: 11.0 mm; Blade thickness: 6.8 mm; Drive blade length: 13.5 mm; Total extension from mounting face: 15.0 mm; Pilot step diameter: Ø12.7 mm. Direct male engagement for electric motor drive couplings on power packs. |
| Straight Keyed Shaft (X1) | Code X1: Cylindrical Shaft with Key | Cylindrical shaft diameter: Ø12.50 mm (+0 / -0.02 mm); Total extension length from flange face: 33.8 mm; Usable drive shaft length: 30.0 mm; Drive key: 4 × 16 mm woodruff key; Dimension over key: 14.0 mm (+0 / -0.2 mm); Neck length: 3.8 mm. |
| Involute Spline Shaft (Y1) | Code Y1: Involute Spline Teeth | 12-Tooth involute spline: 12T × 16/32 DP × 30° pressure angle; Pitch diameter: Ø19.05 mm (nominal); Total shaft extension: 35.0 mm; Effective spline engagement length: 32.0 mm; Neck length: 3.8 mm. Zero-backlash splined connection. |
| Tapered Shaft (Z1) | Code Z1: 1:8 Taper with Retaining Nut | Taper ratio: 1:8 conical taper; Threaded shaft end: M8 × P1.25; Thread length: 12.0 mm; Total shaft extension: 35.50 mm; Drive key: 3 × 13 mm woodruff key; Major taper diameter: Ø13.8 mm. Self-locking conical friction lock for high-vibration drives. |
| Diamond Flange Ports (F1) | Code F1: Metric 4-Bolt Flange Type | Inlet Port: 35.0 mm bolt pitch / Ø14.5 mm fluid bore, 4 × M6 threaded holes; Outlet Port: 35.0 mm bolt pitch / Ø14.5 mm fluid bore, 4 × M6 threaded holes. Rigid O-ring sealed flange connection. |
| Threaded Ports (PT / BSPP) | Code P1/P2 (PT) & G1/G2 (G, BSP, PF) | Threaded female ports: P1 (Inlet 3/8" PT, Outlet 3/8" PT); P2 (Inlet 1/2" PT, Outlet 1/2" PT); G1 (Inlet G 3/8", Outlet G 3/8"); G2 (Inlet G 1/2", Outlet G 1/2"). Internal parallel and tapered pipe thread standards. |
| Model Coding & Ordering Information
| Code Position | Code Designation | Available Standard Options | Technical Definition & Description |
|---|---|---|---|
| [1] Model Series | Product Series | HGP-2A | External Hydraulic Power Unit Gear Pump Series (2 to 12 cc/rev) |
| [2] Mounting Style | Mounting Configuration | F / L | Code F: Flange Mounting Type (Standard); Code L: Foot Bracket Mounting Type |
| [3] Delivery Capacity | Displacement Size (cc/rev) | 2, 25, 3, 4, 5, 6, 8, 9, 11, 12 | Geometric displacement rating: 2.0 up to 12.0 cc/rev (Sizes 25 and 5 are customizable options) |
| [4] Rotation Direction | Direction of Shaft Rotation | R / L | Code R: Clockwise Rotation (viewed facing shaft, standard); Code L: Counter-Clockwise Rotation |
| [5] Drive Shaft Type | Input Shaft Configuration | W1 / X1 / Y1 / Z1 | Code W1: Tang flat paddle shaft; Code X1: Straight cylindrical keyed shaft; Code Y1: Splined shaft; Code Z1: 1:8 Taper shaft |
| [6] Mounting Flange Type | Flange Pattern Standard | 4BJ | Code 4BJ: JIS 4-bolt flange (pilot Ø50.8 mm, square 63.5 × 63.5 mm pattern) |
| [7] Fluid Port Connections | Inlet & Outlet Port Types | F1 / G1~G2 / P1~P2 | Code F1: Diamond flange (35 mm pitch / Ø14.5 mm); Code G: BSPP (G 3/8"~1/2"); Code P: PT/BSPT (3/8"~1/2" PT) |
| Technical Performance Matrix Across Available Sizes
| Model Number | Accurate Displacement (cc/rev) | Operating Pressure (kgf/cm² / bar) | Rotational Speed (r.p.m.) | Theoretical Delivery Flow (L/min) | Unit Mass (kg, approx) | ||||
|---|---|---|---|---|---|---|---|---|---|
| Operational (Rated) | Max. Peak | Rated | Max. | Min. | @ 1500 r.p.m. | @ 1800 r.p.m. | |||
| HGP-2A-2 | 2.0 | 210 / 210 | 250 / 250 | 1800 | 5000 | 1000 | 3.0 | 3.6 | 1.69 |
| HGP-2A-25 | 2.5 | 210 / 210 | 250 / 250 | 1800 | 5000 | 850 | 3.75 | 4.5 | 1.70 |
| HGP-2A-3 | 3.0 | 210 / 210 | 250 / 250 | 1800 | 5000 | 850 | 4.5 | 5.4 | 1.70 |
| HGP-2A-4 | 4.0 | 210 / 210 | 250 / 250 | 1800 | 4500 | 800 | 6.0 | 7.2 | 1.71 |
| HGP-2A-5 | 5.0 | 210 / 210 | 250 / 250 | 1800 | 3500 | 700 | 7.5 | 9.0 | 1.71 |
| HGP-2A-6 | 6.0 | 210 / 210 | 250 / 250 | 1800 | 3500 | 700 | 9.0 | 10.8 | 1.72 |
| HGP-2A-8 | 7.5 | 210 / 210 | 250 / 250 | 1800 | 3000 | 600 | 11.25 | 13.5 | 1.74 |
| HGP-2A-9 | 9.0 | 210 / 210 | 250 / 250 | 1800 | 2500 | 550 | 13.5 | 16.2 | 1.74 |
| HGP-2A-11 | 10.5 | 210 / 210 | 250 / 250 | 1800 | 2000 | 500 | 15.75 | 18.9 | 1.74 |
| HGP-2A-12 | 12.0 | 175 / 175 | 210 / 210 | 1800 | 2000 | 500 | 18.0 | 21.6 | 1.76 |
| Code Position | Code Designation | Available Standard Options | Technical Definition & Description |
|---|---|---|---|
| [1] Model Series | Product Series | HGP-2A | External Hydraulic Power Unit Gear Pump Series (2 to 12 cc/rev) |
| [2] Mounting Style | Mounting Configuration | F / L | Code F: Flange Mounting Type (Standard); Code L: Foot Bracket Mounting Type |
| [3] Delivery Capacity | Displacement Size (cc/rev) | 2, 25, 3, 4, 5, 6, 8, 9, 11, 12 | Geometric displacement rating: 2.0 up to 12.0 cc/rev (Sizes 25 and 5 are customizable options) |
| [4] Rotation Direction | Direction of Shaft Rotation | R / L | Code R: Clockwise Rotation (viewed facing shaft, standard); Code L: Counter-Clockwise Rotation |
| [5] Drive Shaft Type | Input Shaft Configuration | W1 / X1 / Y1 / Z1 | Code W1: Tang flat paddle shaft; Code X1: Straight cylindrical keyed shaft; Code Y1: Splined shaft; Code Z1: 1:8 Taper shaft |
| [6] Mounting Flange Type | Flange Pattern Standard | 4BJ | Code 4BJ: JIS 4-bolt flange (pilot Ø50.8 mm, square 63.5 × 63.5 mm pattern) |
| [7] Fluid Port Connections | Inlet & Outlet Port Types | F1 / G1~G2 / P1~P2 | Code F1: Diamond flange (35 mm pitch / Ø14.5 mm); Code G: BSPP (G 3/8"~1/2"); Code P: PT/BSPT (3/8"~1/2" PT) |
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