Gear pump
Tandem Hydraulic Gear Pump 3PD3F+3PDF 4 Bolt Rectangular
Hengyuhang Tandem Hydraulic Gear Pump 3PD3F+3PDF 4-Bolt Rectangular Series combines dedicated dual Group 3 through-drive stages in a standardized European 4-bolt rectangular configuration, delivering massive synchronized dual-circuit fluid power, heavy-duty drive torque transmission, and continuous operating pressure up to 250 bar.
| Applications of Hengyuhang Tandem Hydraulic Gear Pump 3PD3F+3PDF 4-Bolt Rectangular Series
Engineered for severe-duty mobile machinery and high-tonnage industrial systems, this dual Group 3 tandem pump independently powers two high-demand hydraulic circuits—such as primary boom/bucket operations paired with high-capacity winch or auxiliary attachment circuits—from a single prime mover power take-off. It provides dependable, continuous fluid power for large wheel loaders, forestry harvesters, crawler drill rigs, concrete pump trucks, and heavy scrap metal recycling compaction presses.
| Key Technical Specifications
Product Model: Hengyuhang Tandem Hydraulic Gear Pump 3PD3F+3PDF 4-Bolt Rectangular Series
Brand Replacement: CASAPPA, Rexroth, Marzocchi, Parker OEM or as requested.
Displacement: Front Stage (Group 3): 20 to 71 cm³/rev; Rear Stage (Group 3): 20 to 71 cm³/rev
Rotation Direction: Clockwise (D), counter-clockwise (S), reversible (R)
Speed Range: Min. speed 500 to 600 r/min; Max. speed 2500 to 3500 r/min
Peak Pressure: Up to 300 bar (4,350 psi)
- Description
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| Overview of HENGYUHANG Tandem Hydraulic Gear Pump 3PD3F+3PDF 4-Bolt Rectangular Series
The HENGYUHANG 3PD3F+3PDF 4-Bolt Rectangular Series is a dedicated heavy-duty dual Group 3 fluid power system engineered for high-demand hydraulic machinery. Unlike cross-frame tandem configurations, the 3PD3F+3PDF series pairs a front Group 3 pump section featuring a reinforced through-shaft connection (3PD3F) with a full-capacity rear Group 3 pump section (3PDF). Driven synchronously through an oversized internal through-drive splined coupling, this assembly eliminates the need for bulky external gearboxes, secondary PTO splitter drives, or multiple electric motors, while delivering two completely segregated high-volume hydraulic circuits.
Designed with a standard European Group 3 4-bolt rectangular mounting flange (pilot spigot Ø 50.8 mm / 2.00 inches, rectangular bolt hole pattern 128.0 mm × 98.5 mm), the 3PD3F+3PDF series provides direct mechanical and hydraulic interchangeability with OEM tandem gear pumps across 27 leading international hydraulic manufacturers. Both the primary front section (3PD3F) and the secondary rear section (3PDF) span displacement ranges from 20.0 to 71.0 cm³/rev (with optional expanded displacements up to 89.0 cm³/rev upon engineering request). Combined delivery flows exceeding 210 l/min at nominal engine speeds enable simultaneous high-power machine operations—such as heavy excavator boom lift, arm crowd, hydraulic breaker feed, auxiliary winch drives, or hydrostatic cooling loops—at continuous working pressures up to 250 bar (3,625 psi) and peak pressures up to 300 bar (4,350 psi).
To withstand the immense cumulative mechanical drive torque required to operate two full Group 3 pumping sections under maximum pressure, the 3PD3F front housing features an extra-heavy ductile cast-iron intermediate through-drive connection bracket paired with high-tensile extruded aerospace-grade aluminum alloy bodies. Spheroidal ductile cast-iron front and rear end-plates provide structural rigidity, eliminating casing dilation, shaft deflection, and cyclic fatigue. The rotating groups incorporate case-hardened, precision-ground alloy steel gears riding in high-load hydrodynamic composite DU/PTFE sleeve bushings. Independently floating hydrostatic thrust balance plates dynamically compensate for axial thermal expansion and mechanical wear, guaranteeing volumetric efficiencies exceeding 94% while dampening fluid pressure pulsations and acoustic emissions throughout rigorous operational lifespans.
| Dimension of HENGYUHANG Tandem Hydraulic Gear Pump 3PD3F+3PDF 4-Bolt Rectangular Series
Interface data needed with the drawing:
| Item | Value |
|---|---|
| Front mounting flange | European standard Group 3 4-bolt rectangular flange (centring pilot Ø 50.8 mm / 2.00" h8, bolt hole center spacing 128.0 mm × 98.5 mm / 5.04" × 3.88", clearance holes Ø 11.0 mm for M10 hardware) |
| Primary drive shaft | Standard European 1:8 tapered shaft (T3) with M14 × 1.5 threaded end, slotted nut, and 4.0 mm woodruff key / Optional cylindrical keyed shaft Ø 22.22 mm (7/8") / Involute splined shaft (DIN 5482 or SAE) |
| Intermediate drive coupling | Dedicated heavy-duty Group 3 internal involute splined through-drive sleeve coupling rated for maximum continuous cumulative drive torque (Tmax ≥ 280 Nm) |
| Rotation direction | Clockwise (D) or Counter-clockwise (S), viewed from drive shaft end (Bi-directional reversible rotation available upon special engineering order) |
| Inlet port routing | Independent separate suction ports (standard: individual Group 3 front and rear high-flow suction ports) / Common merged high-flow suction port located on intermediate body (optional for consolidated tank line piping) |
| Front stage ports (Group 3) | European 4-bolt diamond flange (standard) / SAE 4-bolt split flange (Code 61) / BSPP threaded ports / Metric straight thread ports |
| Rear stage ports (Group 3) | European 4-bolt diamond flange (standard) / SAE 4-bolt split flange (Code 61) / BSPP threaded ports / Metric straight thread ports |
| Seal materials | Standard NBR Buna-N elastomeric seals (-20 °C to +85 °C / -4 °F to +185 °F); Optional Viton (FKM) fluorocarbon seals for high-temperature synthetic fluid applications (-15 °C to +110 °C / +5 °F to +230 °F) |
| Body construction | High-tensile extruded aerospace-grade aluminum gear housings with heavy-duty ductile cast-iron front mounting flange, intermediate dual Group 3 through-drive bracket, and rear cover |
| Flange mounting bolt torque | 65 ± 5 Nm (48 ÷ 51 lbf ft) for M10 Grade 8.8 mounting bolts |
| Tie-rod clamp bolt torque | Front Group 3 section: 80 ± 5 Nm; Rear Group 3 section: 80 ± 5 Nm |
| Pump Installation Specifications HENGYUHANG 3PD3F+3PDF 4-Bolt Rectangular Series
The HENGYUHANG 3PD3F+3PDF dedicated dual Group 3 European rectangular flange tandem series utilizes an unambiguous modular model numbering system:
Code structure — reference: 3PD3F+3PDF-E4B — Dedicated Dual Group 3 European 4-Bolt Rectangular Tandem Gear Pump Series
| Segment | Meaning | Standard Options & Features |
|---|---|---|
| Series Code | 3PD3F+3PDF | Dedicated modular dual Group 3 tandem gear pump: Group 3 front through-drive stage + Group 3 rear stage |
| Front Displacement | 20 to 71 | Group 3 front displacement in cm³/rev (20, 23, 26, 30, 34, 38, 44, 52, 60, 71) |
| Rear Displacement | 20 to 71 | Group 3 rear displacement in cm³/rev (20, 23, 26, 30, 34, 38, 44, 52, 60, 71) |
| Rotation | D / S / R | D: Clockwise; S: Counter-clockwise; R: Reversible bi-directional |
| Drive Shaft | T3 / C22 / SP | T3: European 1:8 taper shaft with M14 × 1.5 nut; C22: Ø 22.22 mm cylindrical keyed shaft; SP: Involute splined shaft |
| Mounting Flange | E4B | European standard Group 3 4-bolt rectangular flange (pilot Ø 50.8 mm, 128.0 × 98.5 mm bolt pattern) |
| Inlet Routing | S / C | S: Separate dual suction ports (independent circuits); C: Common single merged high-flow suction inlet |
| Port Types | EF / SF / G / UN | EF: European diamond flange; SF: SAE split flange; G: BSPP thread; UN: SAE O-ring boss |
| Seals | N / V | N: Buna-N (NBR) standard; V: Viton (FKM) high-temperature / synthetic fluid seals |
| Auxiliary Options | RV / FD / ST | RV: Integrated pressure relief valve; FD: Priority flow divider valve; ST: Customized OEM specification |
| Reading your replacement code
| Your Target Brand & Model | HENGYUHANG 3PD3F+3PDF Equivalent | Interchange Verification Notes |
|---|---|---|
| CASAPPA POLARIS PLP30/30 (Euro 4-Bolt Rect.) | HENGYUHANG 3PD3F+3PDF Series | 100% direct drop-in; identical pilot Ø 50.8 mm, 128 × 98.5 mm bolt pattern, 1:8 taper shaft, and dual Group 3 displacement matching |
| Bosch Rexroth AZPG + AZPG Tandem (Euro Rect.) | HENGYUHANG 3PD3F+3PDF Series | Seamless mechanical envelope, shaft taper, and high-pressure performance match for heavy mobile machinery |
| MARZOCCHI GHP3 / ALP3 + GHP3 / ALP3 Tandem | HENGYUHANG 3PD3F+3PDF Series | Exact match on European rectangular flange spigot, port drilling centers, and through-drive torque ratings |
| PARKER PGP517 + PGP517 Tandem (Euro 4-Bolt) | HENGYUHANG 3PD3F+3PDF Series | Complete bolt-pattern, shaft taper, and hydraulic flow replacement for heavy construction equipment |
| DANFOSS SNP3 + SNP3 / SNW3 + SNW3 Tandem | HENGYUHANG 3PD3F+3PDF Series | Direct drop-in fit for European combine harvesters, telescopic telehandlers, and forestry forwarders |
| BUCHER Hydraulics AP300 + AP300 Tandem | HENGYUHANG 3PD3F+3PDF Series | Direct drop-in fit for industrial power packs, drilling rigs, and heavy material handling equipment |
| Galtech 3SPA + 3SPA / 3GPG Tandem (Euro Mount) | HENGYUHANG 3PD3F+3PDF Series | Identical mounting pilot, through-shaft torque distribution, and port centerline dimensions |
| VIVOLO (Vivoil) X3P + X3P / XV-3P + XV-3P Tandem | HENGYUHANG 3PD3F+3PDF Series | Fully interchangeable on European 4-bolt rectangular mounting flange, drive shaft, and dual Group 3 hydraulic flow characteristics |
Techspecs — HENGYUHANG Tandem Hydraulic Gear Pump 3PD3F+3PDF 4-Bolt Rectangular Series
Performance Data Across Displacements
Front Stage — Group 3 (3PD3F Dedicated Through-Drive)
| Model Code | Displacement (cm³/rev) | Displacement (in³/rev) | Continuous Pressure p1 (bar / psi) | Intermittent Pressure p2 (bar / psi) | Peak Pressure p3 (bar / psi) | Min. Speed (r/min) | Max. Speed (r/min) | Flow at 1500 r/min (l/min) |
|---|---|---|---|---|---|---|---|---|
| 3PD3F20 | 20.0 | 1.22 | 250 / 3,625 | 280 / 4,060 | 300 / 4,350 | 600 | 3,500 | 30.0 |
| 3PD3F23 | 23.0 | 1.40 | 250 / 3,625 | 280 / 4,060 | 300 / 4,350 | 600 | 3,500 | 34.5 |
| 3PD3F26 | 26.0 | 1.59 | 250 / 3,625 | 280 / 4,060 | 300 / 4,350 | 500 | 3,200 | 39.0 |
| 3PD3F30 | 30.0 | 1.83 | 240 / 3,480 | 270 / 3,915 | 290 / 4,205 | 500 | 3,200 | 45.0 |
| 3PD3F34 | 34.0 | 2.07 | 240 / 3,480 | 270 / 3,915 | 290 / 4,205 | 500 | 3,000 | 51.0 |
| 3PD3F38 | 38.0 | 2.32 | 230 / 3,335 | 260 / 3,770 | 280 / 4,060 | 500 | 3,000 | 57.0 |
| 3PD3F44 | 44.0 | 2.68 | 210 / 3,045 | 240 / 3,480 | 260 / 3,770 | 500 | 2,800 | 66.0 |
| 3PD3F52 | 52.0 | 3.17 | 190 / 2,755 | 220 / 3,190 | 240 / 3,480 | 500 | 2,800 | 78.0 |
| 3PD3F60 | 60.0 | 3.66 | 180 / 2,610 | 200 / 2,900 | 220 / 3,190 | 500 | 2,800 | 90.0 |
| 3PD3F71 | 71.0 | 4.33 | 160 / 2,320 | 180 / 2,610 | 200 / 2,900 | 500 | 2,500 | 106.5 |
Rear Stage — Group 3 (3PDF Standard)
| Model Code | Displacement (cm³/rev) | Displacement (in³/rev) | Continuous Pressure p1 (bar / psi) | Intermittent Pressure p2 (bar / psi) | Peak Pressure p3 (bar / psi) | Min. Speed (r/min) | Max. Speed (r/min) | Flow at 1500 r/min (l/min) |
|---|---|---|---|---|---|---|---|---|
| 3PDF20 | 20.0 | 1.22 | 250 / 3,625 | 280 / 4,060 | 300 / 4,350 | 600 | 3,500 | 30.0 |
| 3PDF23 | 23.0 | 1.40 | 250 / 3,625 | 280 / 4,060 | 300 / 4,350 | 600 | 3,500 | 34.5 |
| 3PDF26 | 26.0 | 1.59 | 250 / 3,625 | 280 / 4,060 | 300 / 4,350 | 500 | 3,200 | 39.0 |
| 3PDF30 | 30.0 | 1.83 | 240 / 3,480 | 270 / 3,915 | 290 / 4,205 | 500 | 3,200 | 45.0 |
| 3PDF34 | 34.0 | 2.07 | 240 / 3,480 | 270 / 3,915 | 290 / 4,205 | 500 | 3,000 | 51.0 |
| 3PDF38 | 38.0 | 2.32 | 230 / 3,335 | 260 / 3,770 | 280 / 4,060 | 500 | 3,000 | 57.0 |
| 3PDF44 | 44.0 | 2.68 | 210 / 3,045 | 240 / 3,480 | 260 / 3,770 | 500 | 2,800 | 66.0 |
| 3PDF52 | 52.0 | 3.17 | 190 / 2,755 | 220 / 3,190 | 240 / 3,480 | 500 | 2,800 | 78.0 |
| 3PDF60 | 60.0 | 3.66 | 180 / 2,610 | 200 / 2,900 | 220 / 3,190 | 500 | 2,800 | 90.0 |
| 3PDF71 | 71.0 | 4.33 | 160 / 2,320 | 180 / 2,610 | 200 / 2,900 | 500 | 2,500 | 106.5 |
| Note: Operating speed of the complete tandem assembly is governed by the lower maximum speed limit of the two selected pump displacements. | ||||||||
Operating Conditions & Fluid Compatibility
| Operating Parameter | Specification | Recommendation & Limits |
|---|---|---|
| Hydraulic fluid type | Mineral oil-based hydraulic fluids | HL or HLP hydraulic oils to ISO 6743/4; DIN 51524 Part 1 and 2 |
| Operating viscosity range | 12 to 100 mm²/s (cSt) | Optimum performance viscosity range: 20 to 80 mm²/s (cSt) |
| Cold start viscosity limit | Up to 1,000 mm²/s (cSt) | Permissible during low-speed, low-pressure machine warm-up cycles |
| Fluid operating temperature | -20 °C to +85 °C (-4 °F to +185 °F) | Standard NBR Buna-N seals; Viton (FKM) required for +85 °C to +110 °C |
| Inlet suction line pressure | 0.7 to 3.0 bar absolute (10 to 44 psia) | Minimum 0.7 bar abs. at full working speed to prevent inlet cavitation |
| Fluid cleanliness rating | ISO 4406 Class 20/18/15 | Recommended circuit filtration: β25 ≥ 75 on return or suction filtration loop |
| Drive torque transmission | Reinforced Group 3 through-drive spline shaft | Input shaft maximum torque must satisfy: Ttotal = Tfront + Trear ≤ Tshaft_limit |
Advantages — HENGYUHANG Tandem Hydraulic Gear Pump 3PD3F+3PDF 4-Bolt Rectangular Series
Dedicated Dual Group 3 High-Flow Pumping Power
Integrates two heavy-duty Group 3 pump stages (up to 71 + 71 cm³/rev), delivering combined output flows exceeding 210 l/min from a single prime mover power take-off.
European Standard 4-Bolt Drop-In Interchangeability
Manufactured to exact European Group 3 4-bolt rectangular mounting standards (pilot Ø 50.8 mm, bolt hole spacing 128.0 × 98.5 mm) with standard 1:8 tapered drive shafts, ensuring zero-modification drop-in substitution across 27 major European and international pump brands.
Heavy-Duty Reinforced Through-Drive Torque Rating
Equipped with an induction-hardened involute splined through-drive intermediate coupling and reinforced ductile iron connection housing engineered to transmit full continuous torque under extreme working pressures.
Sustained Volumetric Efficiency (>94%)
Individual hydrostatic floating thrust balance plates on both pump sections continuously balance axial clearances across temperature and pressure fluctuations, minimizing internal slip and ensuring consistent output flow.
Flexible Suction Porting & Consolidated Plumbing
Available with independent separate suction ports for isolated hydraulic fluid loops or an optional merged common high-flow inlet, drastically simplifying reservoir suction line plumbing on crowded machine chassis.
Quiet Operation & Minimized Fluid Pulsation
High-precision hobbed and shaved gear profiles minimize fluid trapping and pressure ripple, dampening acoustic emissions across mobile machine operator cabs and stationary industrial environments.
Reference — HENGYUHANG Tandem Hydraulic Gear Pump 3PD3F+3PDF 4-Bolt Rectangular Series
Series Architecture Across Dual Group 3PD3F + Group 3PDF Tandem Combinations
The modular 3PD3F+3PDF tandem architecture pairs 10 front Group 3 through-drive displacements with 10 rear Group 3 displacements, providing over 100 standardized displacement combinations:
Heavy Primary Work Stage (Group 3PD3F): Displacements 20, 23, 26, 30, 34, 38, 44, 52, 60, and 71 cm³/rev for primary mobile equipment boom, arm, winch, and high-pressure work tool circuits.
High-Capacity Secondary Work Stage (Group 3PDF): Displacements 20, 23, 26, 30, 34, 38, 44, 52, 60, and 71 cm³/rev for independent secondary work circuits, high-flow hydraulic winches, auxiliary implement drives, and separate closed-loop feed circuits.
Comprehensive Interchangeability Matrix Across 27 Brands
The HENGYUHANG Tandem Hydraulic Gear Pump 3PD3F+3PDF 4-Bolt Rectangular Series provides full mechanical, mounting, and hydraulic drop-in substitution for the following 27 international hydraulic manufacturers and their designated pump families:
MARZOCCHI: GHP2A, ALP2A, GHP2, ALP2, 1PD, GHP3, ALP3, GHP3A, ALP3A series tandem and modular gear pumps.
DANFOSS Power Solutions: SNP1NN, SNP3NN, SNW3NN series, SNP2, SNW2 series multi-section hydraulic pumps.
HYDAC: PGE102, PGE103 series, PGE104 series multi-circuit external gear pumps.
ARGO-HYTOS: GP2, GP3, GP1 series tandem external gear pump assemblies.
ATOS: PFG series modular tandem external gear pumps.
Brevini Fluid Power (Dana Brevini): OT100, OT200, OT300 series tandem gear pumps.
BUCHER Hydraulics: AP100, AP200, AP212, AP300 series multi-section gear pumps.
BONDIOLI & PAVESI: HPLPA1, HPLPA2, HPLPA3 series modular tandem gear pump units.
Boden: BAP1 series, BHP1, BAP2, BHP2, BHP3, BAP3 series multi-circuit hydraulic gear pumps.
Caproni: 10A, 20A, 30A, 10C, 20C, 30C series multi-section hydraulic pumps.
CASAPPA: POLARIS Series PLP10, PLP20, PLP30 tandem gear pumps (PLP30+PLP30 European rectangular mounting).
CONCENTRIC (Haldex): WP300, WP900, WP1500 series multi-stage external gear pumps.
DUPLOMATIC: 1P, GP2, GP3, GP1 series tandem external gear pumps.
Galtech: 1SPA, 2SPA, 3GPG, 3SPA series multi-circuit tandem hydraulic pumps.
GRH Hydraulics: 1PF, 2PF, 3PF series modular tandem external gear pumps.
HANSA-TMP: 1SP, 2SP, 3GPG, 3SPA series tandem gear pump systems.
HESPER: HA11, HA2, HA3 series, CHP1 series multi-stage hydraulic gear pumps.
HONOR Gear Pumps: 1KH series and Group 2/Group 3 tandem gear pump configurations.
HPI (Hydraulique Professionnelle Industrielle): P1BAN1, P1BAN2, P1AAN2, P1BAN3, P1AAN3 series tandem pumps.
HYDRONIT: E series multi-circuit modular gear pumps.
JIHOSTROJ: P23 series, J series, T3 series, Q2 series, UD series multi-section gear pumps.
PARKER Hannifin: PGP505 series, PGP502 series, PGP511, PGP517 series tandem external gear pumps.
Bosch Rexroth: AZPB series, AZPF, AZPG, AZPN series multi-circuit external gear pumps.
RONZIO: 01ZAG series, 01ZBG series, 02ZAG, 02ZCG, 02ZLG series tandem gear pumps.
ROQUET: 1L0 series, PLA series, GZ series, G series, GLA series, PLC series multi-stage gear pumps.
SDH (Shengda Hydraulics): CBD series multi-section external gear pumps.
VIVOLO (Vivoil): X1P series, XV-1P series, X2P, X3P series, XV-2P, XV-3P series tandem external gear pumps.
Brand Replacement
Quanzhou Hengyuhang Power Technology Co., Ltd. manufactures the 3PD3F+3PDF 4-Bolt Rectangular Dedicated Dual Group 3 Tandem Gear Pump Series in strict alignment with European standardized mounting dimensions and international fluid power specifications. Every tandem unit undergoes 100% computerized end-of-line verification, including simultaneous dual-circuit continuous pressure hold, multi-speed volumetric efficiency mapping (>94%), high-torque through-drive spline integrity testing, and port thread gauge verification. Machinery builders, equipment rebuilders, and hydraulic distributors can replace worn, failed, or long-lead OEM tandem pumps from CASAPPA, Rexroth, MARZOCCHI, PARKER, and DANFOSS with zero machine modifications, zero bracket reworking, and zero driveline realignment. Custom displacement combinations, specialized shaft profiles, common inlet manifolds, and integrated pressure relief or priority valves are fully supported with agile production schedules.
Applications — HENGYUHANG Tandem Hydraulic Gear Pump 3PD3F+3PDF 4-Bolt Rectangular Series
Heavy Mobile Construction Machinery: Large wheel loaders, crawler excavators, backhoe loaders, trenchers, and concrete pump trucks requiring dual high-flow fluid power delivery for boom lift, arm swing, and auxiliary implement attachments.
Heavy Agricultural & Harvesting Equipment: High-horsepower articulated tractors, self-propelled combine harvesters, forage harvesters, and forestry skidders operating dual high-demand hydraulic work loops from a single engine drive pad.
Material Handling & Port Equipment: Heavy container reach stackers, rough-terrain heavy forklifts, straddle carriers, and truck-mounted mobile cranes requiring separate high-flow mast hoisting and boom extension circuits.
Mining & Drilling Machinery: Rotary blast hole drill rigs, continuous underground mining haulers, tunnel boring auxiliary units, and crawler drilling machinery.
High-Capacity Industrial Hydraulic Power Units (HPUs): High-tonnage scrap metal balers, industrial compaction presses, plastic injection molding clamping and ejection systems, and heavy hydraulic forging machinery.
Municipal & Severe-Duty Environmental Vehicles: Heavy refuse compaction trucks, large street sweeping vacuum trucks, high-pressure sewer jetting trucks, and multi-function road maintenance vehicles.
Package & Shipping
| Packaging | Neutral heavy-duty export carton with form-fitting high-density molded foam cushioning; individual sealed anti-corrosion VCI barrier bags; export standard fumigation-free wooden pallet consolidation for batch orders. |
|---|---|
| Selling Unit | Single item (MOQ: 1 piece for standard displacement configurations; low MOQ for customized OEM combinations). |
| Single Package Size | 46.0 × 28.0 × 26.0 cm (18.11 × 11.02 × 10.24 in) per dual Group 3 tandem pump assembly. |
| Single Gross Weight | 14.50 to 22.80 kg (31.97 to 50.27 lbs) depending on displacement pairing and port options. |
| Standard Lead Time | 3–7 business days for stock displacement pairings; 15–20 business days for tailored OEM batch production. |
| Logistics & Express | Air express (DHL, FedEx, UPS, TNT), air freight, ocean freight (FCL / LCL), and multimodal door-to-door DDP logistics with full tracking. |
| Customization Services | Custom nameplate laser engraving, private brand labeling, specialized shaft spline profiles, custom port threads, and factory CAD verification. |
Why Choose Hengyuhang?
Direct Factory Precision Manufacturing & CNC Excellence: Hengyuhang operates an advanced precision manufacturing facility equipped with multi-axis CNC machining centers, high-speed gear hobbing equipment, and CNC gear profile grinding machines. Operating clearances and gear tooth profiles are held to sub-micron tolerances (Ra < 0.2 μm), ensuring flawless gear meshing, structural rigidity, and long service life.
100% Full-Cycle Multi-Parameter Factory Inspection: Every tandem pump unit undergoes rigorous computerized testing prior to packaging. Testing protocols encompass multi-speed volumetric efficiency benchmarking (>94%), continuous rated and peak pressure endurance, internal casing leakage measurement, through-drive intermediate coupling load verification, and digital acoustic spectrum analysis to guarantee zero-defect delivery.
Seamless 1:1 OEM Drop-In Interchangeability: Engineered to precise European Group 3 4-bolt rectangular flange, standard 1:8 tapered shaft, and port centerline dimensions, Hengyuhang pumps provide 100% form, fit, and functional drop-in replacement for over 27 global hydraulic manufacturers without mounting bracket or plumbing alterations.
Flexible Engineering Customization & Rapid Prototyping: Supported by an experienced hydraulic engineering team, Hengyuhang provides tailored solutions including non-standard displacement combinations, common or separate suction port routing, integrated pressure relief or priority flow control valves, and low-MOQ rapid sampling for new machinery development.
Robust Supply Chain, Extensive Inventory & Fast Global Dispatch: With large strategic raw material reserves of aerospace-grade aluminum extrusions and ductile cast-iron end castings, standard displacement assemblies ship within 48 to 72 hours. Comprehensive international logistics channels ensure dependable door-to-door DDP delivery worldwide.
12-Month Comprehensive Warranty & Lifetime Technical Support: All products are backed by an unconditional 12-month factory warranty. Hengyuhang's dedicated fluid power engineers provide rapid 24-hour CAD mounting verification, cross-reference model decoding, and lifetime technical support for distributors and OEMs worldwide.
Tandem Hydraulic Gear Pump Group 3PD3F+3PDF 4-Bolt Rectangular Series (20~71 + 20~71 cm³/rev) is a heavy-duty, high-flow modular dual-stage external gear pump engineered to deliver two independent high-capacity fluid power streams or combined high-low differential delivery from a single prime mover. Equipped with an industry-standard European Group 3 4-bolt rectangular mounting flange (98.5 × 128.0 mm bolt pitch, Ø50.8 mm centering pilot), this tandem unit couples a high-flow Group 3 front pump section (3PD3F) with a matching Group 3 rear pump section (3PDF) via a heavy-duty Group 3-to-Group 3 internal spline through-drive coupling. Both stages offer 11 standardized displacement sizes (20.0, 22.0, 26.0, 33.0, 39.0, 46.0, 50.0, 52.0, 55.0, 63.0, and 71.0 cm³/rev), providing massive combined delivery volume from 40.0 up to 142.0 cm³/rev (up to 213.0 L/min at 1500 r/min). Both front and rear sections handle continuous operating pressures (P1) up to 250 bar (3,625 psi) and transient peak pressures (P3) up to 280 bar (4,060 psi). Constructed with high-strength extruded aerospace-grade aluminium alloy gear bodies, spheroidal ductile cast-iron front mounting flanges, intermediate tandem adapters, and rear end-covers, this series incorporates case-hardened alloy steel precision gears and hydrostatic axial pressure-balanced DU composite thrust bushings. Sustaining volumetric efficiency above 94%, it serves as a direct 1:1 drop-in replacement for CASAPPA POLARIS (PLP30+PLP30), Bosch Rexroth (AZPN+AZPN), Marzocchi, Parker, and Danfoss dual Group 3 gear pumps.
| Applications
The 3PD3F+3PDF 4-bolt rectangular tandem hydraulic gear pump series is engineered for high-demand continental mobile machinery and industrial hydraulic power units that require large flow rates and continuous high operating pressures across two isolated hydraulic circuits from a single power take-off (PTO) or electric motor drive: high-horsepower agricultural tractors and combine harvesters (independent high-flow circuits powering heavy front-end loader attachments, hydraulic motors, and steering/implement functions), heavy mobile cranes, container reach stackers, and heavy rough-terrain forklifts (supplying simultaneous full-capacity mast lift, telescopic boom extension, and carriage handling), wheel loaders, large backhoe loaders, motor graders, crawler bulldozers, hydraulic drilling rigs, dual-speed high-tonnage hydraulic presses and metal balers (combining both stages for rapid tool approach, followed by high-pressure pressing), municipal refuse compactor trucks, hook loaders, timber harvesting equipment, and central industrial hydraulic power units (HPUs) driving heavy automated manufacturing machinery.
| Key Specifications Overview
| Parameter | Specification |
|---|---|
| Series Architecture | Heavy-Duty Dual-Stage External Hydraulic Gear Pump (Group 3 Front 3PD3F + Group 3 Rear 3PDF) |
| Front Stage Displacement (3PD3F) | 20.0 ~ 71.0 cm³/rev (11 standard sizes: 20, 22, 26, 33, 39, 46, 50, 52, 55, 63, 71 cm³/rev) |
| Rear Stage Displacement (3PDF) | 20.0 ~ 71.0 cm³/rev (11 standard sizes: 20, 22, 26, 33, 39, 46, 50, 52, 55, 63, 71 cm³/rev) |
| Total Combined Displacement Range | 40.0 ~ 142.0 cm³/rev (modular independent stage pairing: V1 + V2) |
| Continuous Operating Pressure (P1) | 180 ~ 250 bar (2,610 ~ 3,625 psi) — 250 bar for 20~26 cc; 230 bar for 33~46 cc; 220 bar for 50~52 cc; 200 bar for 55~63 cc; 180 bar for 71 cc |
| Intermittent Operating Pressure (P2) | 200 ~ 265 bar (2,900 ~ 3,843 psi) — 265 bar for 20~26 cc; 250 bar for 33~46 cc; 240 bar for 50~52 cc; 230 bar for 55~63 cc; 200 bar for 71 cc |
| Max. Peak Pressure (P3) | 220 ~ 280 bar (3,190 ~ 4,060 psi) — 280 bar for 20~26 cc; 270 bar for 33~46 cc; 260 bar for 50~52 cc; 250 bar for 55~63 cc; 220 bar for 71 cc |
| Rotational Speed Range | Min. speed: 400 ~ 600 r/min; Max. speed: 2500 ~ 3500 r/min (displacement dependent) |
| Volumetric Efficiency | ≥ 94% across rated pressure and operating thermal envelope |
| Hydro-Mechanical Efficiency | ≥ 89% ~ 92% |
| Body & Housing Construction | High-tensile extruded aluminium alloy central bodies with spheroidal ductile cast-iron front mounting flange, intermediate Group 3 adapter, and rear cover |
| Mounting Flange Standard | European standard Group 3 4-bolt rectangular flange (pilot Ø50.8 mm, 98.5 × 128.0 mm bolt pitch, 4 × Ø11.4 mm through holes, flange face 122 × 152 mm) |
| Drive Shaft Specification | European standard 1:8 taper shaft with woodruff key (key width 4.0 -0.03 mm, M14×1.5 retaining nut, Ø19.0 mm taper base, 47.0 mm total extension: 33.0 mm taper + 14.0 mm thread) |
| Intermediate Coupling Mechanism | Case-hardened precision involute splined internal coupling sleeve linking front (3PD3F) and rear (3PDF) drive shafts with high torque capacity (up to 180 Nm) |
| Hydraulic Port Connections | Independent flanged ports: European 4-bolt rectangular flanged ports with M10 tapped holes on both stages (common inlet porting available on request) |
| Rotation Direction | Clockwise (D / Right-Hand) standard; Counter-Clockwise (S / Left-Hand) available upon request (viewed from drive shaft end) |
| Hydraulic Fluid Compatibility | Mineral-oil-based hydraulic fluids (HL / HLP to ISO 6743/4; DIN 51524 Class 1 and 2); optimal viscosity range: 20 ~ 80 mm²/s (cSt) |
| Operating Temperature Range | -20°C to +85°C (standard NBR seals); -15°C to +110°C (optional Viton FKM seals) |
| Assembly Tightening Torques | Flange mounting bolts: 85 ± 5 Nm; Group 3 body tie-rod clamp bolts: 95 ± 5 Nm |
| Technical Performance Matrix Across Available Group 3 Stages
| Stage Model Code | Displacement (cm³/rev) | Operating Pressure (bar / psi) | Speed Range (r/min) | Flow @ 1500 rpm (L/min) | |||
|---|---|---|---|---|---|---|---|
| Continuous (P1) | Intermittent (P2) | Peak (P3) | Min. Speed | Max. Speed | |||
| 3PD3F20 / 3PDF20 | 20.0 | 250 / 3,625 | 265 / 3,843 | 280 / 4,060 | 600 | 3500 | 30.0 |
| 3PD3F22 / 3PDF22 | 22.0 | 250 / 3,625 | 265 / 3,843 | 280 / 4,060 | 600 | 3500 | 33.0 |
| 3PD3F26 / 3PDF26 | 26.0 | 250 / 3,625 | 265 / 3,843 | 280 / 4,060 | 600 | 3000 | 39.0 |
| 3PD3F33 / 3PDF33 | 33.0 | 230 / 3,335 | 250 / 3,625 | 270 / 3,915 | 500 | 3000 | 49.5 |
| 3PD3F39 / 3PDF39 | 39.0 | 230 / 3,335 | 250 / 3,625 | 270 / 3,915 | 500 | 3000 | 58.5 |
| 3PD3F46 / 3PDF46 | 46.0 | 230 / 3,335 | 250 / 3,625 | 270 / 3,915 | 500 | 3000 | 69.0 |
| 3PD3F50 / 3PDF50 | 50.0 | 220 / 3,190 | 240 / 3,480 | 260 / 3,770 | 500 | 3000 | 75.0 |
| 3PD3F52 / 3PDF52 | 52.0 | 220 / 3,190 | 240 / 3,480 | 260 / 3,770 | 500 | 3000 | 78.0 |
| 3PD3F55 / 3PDF55 | 55.0 | 200 / 2,900 | 230 / 3,335 | 250 / 3,625 | 400 | 2800 | 82.5 |
| 3PD3F63 / 3PDF63 | 63.0 | 200 / 2,900 | 230 / 3,335 | 250 / 3,625 | 400 | 2800 | 94.5 |
| 3PD3F71 / 3PDF71 | 71.0 | 180 / 2,610 | 200 / 2,900 | 220 / 3,190 | 400 | 2500 | 106.5 |
| European 4-Bolt Mounting Flange, Shaft & Port Details
| Interface Feature | Technical Standard & Dimension |
|---|---|
| Mounting Flange | European standard Group 3 4-bolt rectangular mounting flange (overall face 122.0 × 152.0 mm) |
| Centering Pilot | Ø50.8 (-0.025 / -0.080) mm pilot diameter with 5.0 mm pilot depth |
| Bolt Hole Pitch & Pattern | 98.5 × 128.0 mm bolt pitch with 4 × Ø11.4 mm through mounting holes |
| Primary Drive Shaft | European standard 1:8 taper shaft with woodruff key (key width 4.0 -0.03 mm, key height 12.2 mm, M14×1.5 retaining nut, Ø19.0 mm taper base, 47.0 mm total extension: 33.0 mm taper + 14.0 mm thread) |
| Intermediate Coupling Shaft | Group 3-to-Group 3 internal spline through-drive coupling connecting front (3PD3F) and rear (3PDF) gear shafts (allowable intermediate drive torque: 180 Nm) |
| Inlet Ports (Both Stages) | European standard 4-bolt rectangular flanged ports with M10 tapped holes (Ø27.0 mm counterbore with 51/56 mm bolt pitch for 20~52 cc; Ø33.0 mm counterbore with 62 mm bolt pitch for 55~71 cc) |
| Outlet Ports (Both Stages) | European standard 4-bolt rectangular flanged ports with M10 tapped holes (Ø19.0 mm counterbore with 56 mm bolt pitch for 20~39 cc; Ø27.0 mm counterbore with 51/56 mm bolt pitch for 46~71 cc) |
| 1:1 Direct-Fit OEM Brand Replacement Coverage
| Manufacturer Brand | Direct-Fit Drop-In Tandem Equivalent Series |
|---|---|
| CASAPPA | POLARIS Dual Series (PLP30 + PLP30 / PL30 + PL30 with European 4-bolt rectangular flange) |
| Bosch Rexroth | AZPN-1X + AZPN-1X Group 3 + Group 3 multiple gear pumps (European 4-bolt rectangular mounting) |
| MARZOCCHI | 3P + 3P / ALP3 + ALP3 / GHP3 + GHP3 European 4-bolt modular tandem gear pumps |
| PARKER Hannifin | PGP517 + PGP517 / PGP620 + PGP620 European standard multiple section external gear pumps |
| DANFOSS / Turolla | SNP3NN + SNP3NN Group 3 + Group 3 dual external gear pumps (European 4-bolt flange) |
| VIVOLO (Vivoil) | XV-3P + XV-3P multiple section external gear pumps (European 4-bolt pattern) |
| SALAMI | 3PB + 3PB / 3PE + 3PE dual gear pumps with European rectangular spigot pilot |
| BUCHER Hydraulics | AP300 + AP300 / QX3 + QX3 European 4-bolt double gear pump combinations |
| Technical Performance Matrix Across Available Group 3 Stages
| Stage Model Code | Displacement (cm³/rev) | Operating Pressure (bar / psi) | Speed Range (r/min) | Flow @ 1500 rpm (L/min) | |||
|---|---|---|---|---|---|---|---|
| Continuous (P1) | Intermittent (P2) | Peak (P3) | Min. Speed | Max. Speed | |||
| 3PD3F-20 / 3PDF-20 | 20.0 | 250 / 3,625 | 265 / 3,843 | 280 / 4,060 | 600 | 3500 | 30.0 |
| 3PD3F-22 / 3PDF-22 | 22.0 | 250 / 3,625 | 265 / 3,843 | 280 / 4,060 | 600 | 3500 | 33.0 |
| 3PD3F-26 / 3PDF-26 | 26.0 | 250 / 3,625 | 265 / 3,843 | 280 / 4,060 | 600 | 3000 | 39.0 |
| 3PD3F-33 / 3PDF-33 | 33.0 | 230 / 3,335 | 250 / 3,625 | 270 / 3,915 | 500 | 3000 | 49.5 |
| 3PD3F-39 / 3PDF-39 | 39.0 | 230 / 3,335 | 250 / 3,625 | 270 / 3,915 | 500 | 3000 | 58.5 |
| 3PD3F-46 / 3PDF-46 | 46.0 | 230 / 3,335 | 250 / 3,625 | 270 / 3,915 | 500 | 3000 | 69.0 |
| 3PD3F-50 / 3PDF-50 | 50.0 | 220 / 3,190 | 240 / 3,480 | 260 / 3,770 | 500 | 3000 | 75.0 |
| 3PD3F-52 / 3PDF-52 | 52.0 | 220 / 3,190 | 240 / 3,480 | 260 / 3,770 | 500 | 3000 | 78.0 |
| 3PD3F-55 / 3PDF-55 | 55.0 | 200 / 2,900 | 230 / 3,335 | 250 / 3,625 | 400 | 2800 | 82.5 |
| 3PD3F-63 / 3PDF-63 | 63.0 | 200 / 2,900 | 230 / 3,335 | 250 / 3,625 | 400 | 2800 | 94.5 |
| 3PD3F-71 / 3PDF-71 | 71.0 | 180 / 2,610 | 200 / 2,900 | 220 / 3,190 | 400 | 2500 | 106.5 |
| Manufacturer Brand | Direct-Fit Drop-In Tandem Equivalent Series |
|---|---|
| CASAPPA | POLARIS Dual Series (PLP30 + PLP30 / PL30 + PL30 with European 4-bolt rectangular flange) |
| Bosch Rexroth | AZPN-1X + AZPN-1X Group 3 + Group 3 multiple gear pumps (European 4-bolt rectangular mounting) |
| MARZOCCHI | 3P + 3P / ALP3 + ALP3 / GHP3 + GHP3 European 4-bolt modular tandem gear pumps |
| PARKER Hannifin | PGP517 + PGP517 / PGP620 + PGP620 European standard multiple section external gear pumps |
| DANFOSS / Turolla | SNP3NN + SNP3NN Group 3 + Group 3 dual external gear pumps (European 4-bolt flange) |
| VIVOLO (Vivoil) | XV-3P + XV-3P multiple section external gear pumps (European 4-bolt pattern) |
| SALAMI | 3PB + 3PB / 3PE + 3PE dual gear pumps with European rectangular spigot pilot |
| BUCHER Hydraulics | AP300 + AP300 / QX3 + QX3 European 4-bolt double gear pump combinations |
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