Gear pump
Tandem Hydraulic Gear Pump 3PD2F+2PDF SAE B 2-Bolt Series
Hengyuhang Tandem Hydraulic Gear Pump 3PD2F+2PDF SAE B 2-Bolt Series combines high-displacement Group 3 primary delivery with versatile Group 2 secondary fluid power in a compact tandem configuration, delivering superior multi-circuit volumetric efficiency and continuous pressure performance up to 300 bar.
| Applications of Hengyuhang Tandem Hydraulic Gear Pump 3PD2F+2PDF SAE B 2-Bolt Series
Engineered for multi-actuator mobile equipment and industrial hydraulic systems, this heavy-duty tandem pump drives primary working hydraulics alongside secondary steering, cooling, or pilot control circuits from a single prime mover power take-off. It provides dependable fluid power for wheel loaders, backhoes, agricultural harvesters, forestry forwarders, drill rigs, and stationary hydraulic power packs operating under rigorous continuous duty cycles.
| Key Technical Specifications
Product Model: Hengyuhang Tandem Hydraulic Gear Pump 3PD2F+2PDF SAE B 2-Bolt Series
Brand Replacement: CASAPPA, Rexroth, Marzocchi, Parker OEM or as requested.
Displacement: Front Stage (Group 3): 20 to 71 cm³/rev; Rear Stage (Group 2): 4 to 30 cm³/rev
Rotation Direction: Clockwise (D), counter-clockwise (S), reversible (R)
Speed Range: Min. speed 500 to 700 r/min; Max. speed 2800 to 3500 r/min
Peak Pressure: Up to 300 bar (4,350 psi)
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| Overview of HENGYUHANG Tandem Hydraulic Gear Pump 3PD2F+2PDF SAE B 2-Bolt Series
The HENGYUHANG 3PD2F+2PDF SAE B 2-Bolt Series delivers an engineered dual-circuit fluid power solution that integrates a high-capacity Group 3 (3PD2F / 3PDF) front pump section with a precision Group 2 (2PDF) rear pump section. Driven by a single input drive shaft through an internal heavy-duty splined intermediate coupling, this tandem assembly powers two completely independent hydraulic circuits with distinct pressure and flow requirements, eliminating the need for secondary PTO gearboxes, auxiliary drive belts, or dual electric motors.
Featuring an industry-standard SAE B 2-bolt oval mounting flange (pilot Ø 101.6 mm / 4.00 inches, bolt hole spacing 146.0 mm / 5.75 inches), the 3PD2F+2PDF series provides direct mechanical interchangeability with OEM tandem gear pumps across 27 global hydraulic manufacturers. The front pump section covers displacements from 20.0 to 71.0 cm³/rev (up to 89.0 cm³/rev upon engineering request), handling primary high-volume work circuits such as boom lift, bucket tilt, and main hydrostatic auxiliary feed at continuous working pressures up to 250 bar (3,625 psi) and peak pressures up to 300 bar (4,350 psi). The rear Group 2 section covers displacements from 4.0 to 30.0 cm³/rev, independently serving auxiliary steering circuits, hydraulic fan drive loops, brake cooling, or pilot joystick valve systems at pressures up to 250 bar.
The pump housing is constructed from high-density extruded aerospace-grade aluminum alloy bodies reinforced with heavy-duty spheroidal ductile cast-iron front mounting flanges, intermediate tandem connection flanges, and rear end-covers. This hybrid bi-material architecture provides outstanding resistance to structural deflection, cyclic fatigue, and pressure pulsation barrel dilation. The rotating assemblies incorporate case-hardened, precision-ground alloy steel gears supported by high-load hydrodynamic composite DU/PTFE sleeve bushings. Floating hydrostatic axial thrust plates continuously balance operating clearances across variable temperature and load regimes, maintaining volumetric efficiencies exceeding 94% while minimizing noise emissions and internal slippage across thousands of rigorous operating hours.
| Dimension of HENGYUHANG Tandem Hydraulic Gear Pump 3PD2F+2PDF SAE B 2-Bolt Series
Interface data needed with the drawing:
| Item | Value |
|---|---|
| Front mounting flange | Standard SAE B 2-bolt oval mounting flange (pilot Ø 101.6 mm / 4.00" h8, bolt hole center-to-center distance 146.0 mm / 5.75", clearance holes Ø 14.3 mm / 9/16") |
| Primary drive shaft | SAE B 13-tooth involute splined shaft (7/8" 16/32 DP, flat root side fit) / SAE B Ø 22.22 mm (7/8") cylindrical keyed shaft with 1/4" square key / Optional 1:8 European taper shaft with M14 × 1.5 nut |
| Intermediate drive coupling | High-torque internal involute splined sleeve coupling connecting Group 3 through-shaft to Group 2 drive gear journal, rated for combined maximum drive torque |
| 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 and Group 2 inlets) / Common single suction port routing on intermediate body (optional for consolidated hydraulic tank piping) |
| Front stage ports (Group 3) | 4-bolt SAE split flange (Code 61) / European 4-bolt diamond flange / SAE straight thread O-ring boss (UN/UNF) / BSPP threaded ports |
| Rear stage ports (Group 2) | European 4-bolt diamond flange / SAE straight thread O-ring boss (UN/UNF) / BSPP cylindrical threaded ports |
| Seal materials | NBR Buna-N elastomeric seals standard (-20 °C to +85 °C / -4 °F to +185 °F); Viton (FKM) high-temperature fluorocarbon seals optional (-15 °C to +110 °C / +5 °F to +230 °F) |
| Body construction | High-tensile extruded aluminum alloy gear casings with heavy-duty ductile cast-iron SAE B front flange, intermediate connection bracket, and rear cover |
| SAE B mounting bolt torque | 100 ± 5 Nm (74 ÷ 77 lbf ft) for Grade 8.8 / Grade 5 mounting hardware |
| Tie-rod clamp bolt torque | Group 3 section: 80 ± 5 Nm; Group 2 section: 60 ± 4 Nm |
| Pump Installation Specifications HENGYUHANG 3PD2F+2PDF SAE B 2-Bolt Series
The HENGYUHANG 3PD2F+2PDF tandem series utilizes a standardized modular designation system that defines displacement combinations, mounting geometry, shaft profiles, and port configurations:
Code structure — reference: 3PD2F+2PDF-SAEB2 — Group 3 + Group 2 High-Pressure Tandem Gear Pump Series
| Segment | Meaning | Standard Options & Features |
|---|---|---|
| Series Code | 3PD2F+2PDF | Modular cross-group tandem gear pump: Group 3 front stage + Group 2 rear stage |
| Front Displacement | 20 to 71 | Group 3 displacement in cm³/rev (20, 23, 26, 30, 34, 38, 44, 52, 60, 71) |
| Rear Displacement | 04 to 30 | Group 2 displacement in cm³/rev (4.0, 6.0, 8.5, 11.0, 14.0, 16.5, 19.5, 22.5, 26.0, 30.0) |
| Rotation | D / S / R | D: Clockwise; S: Counter-clockwise; R: Reversible bi-directional |
| Drive Shaft | SB13 / CB22 / T3 | SB13: SAE B 13T spline (7/8" 16/32 DP); CB22: SAE B Ø 22.22 mm keyed shaft; T3: 1:8 European taper shaft |
| Mounting Flange | B2 | Standard SAE B 2-bolt oval mounting flange (pilot Ø 101.6 mm, 146.0 mm bolt spacing) |
| Inlet Routing | S / C | S: Separate dual suction ports (independent circuits); C: Common single merged suction inlet |
| Port Types | SF / EF / UN / G | SF: SAE 4-bolt split flange; EF: European diamond flange; UN: SAE O-ring boss; G: BSPP thread |
| 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 3PD2F+2PDF Equivalent | Interchange Verification Notes |
|---|---|---|
| CASAPPA POLARIS PLP30/20 (SAE B 2-Bolt) | HENGYUHANG 3PD2F+2PDF Series | 100% direct drop-in; identical SAE B pilot Ø 101.6 mm, 13T splined shaft, and stage displacement matching |
| Bosch Rexroth AZPG + AZPF Tandem (SAE B) | HENGYUHANG 3PD2F+2PDF Series | Seamless mechanical envelope, shaft spline fit, and pressure capability match for mobile wheel loaders |
| MARZOCCHI GHP3 / ALP3 + GHP2 / ALP2 Tandem | HENGYUHANG 3PD2F+2PDF Series | Direct interchange on SAE B flange spigot, port drilling centers, and through-drive torque ratings |
| PARKER PGP517 + PGP511 Tandem (SAE B 2-Bolt) | HENGYUHANG 3PD2F+2PDF Series | Complete bolt-hole, shaft spline, and hydraulic performance replacement for construction machinery |
| DANFOSS SNP3 + SNP2 / SNW3 + SNW2 Tandem | HENGYUHANG 3PD2F+2PDF Series | Exact match for multi-function agricultural harvesters, forestry forwarders, and telescopic handlers |
| BUCHER Hydraulics AP300 + AP200 Tandem | HENGYUHANG 3PD2F+2PDF Series | Direct drop-in fit for industrial power packs, drilling rigs, and heavy material handling equipment |
| Galtech 3SPA + 2SPA Tandem (SAE B Mount) | HENGYUHANG 3PD2F+2PDF Series | Identical mounting pilot, through-shaft torque distribution, and port centerline dimensions |
| VIVOLO (Vivoil) X3P + X2P / XV-3P + XV-2P Tandem | HENGYUHANG 3PD2F+2PDF Series | Fully interchangeable on SAE B mounting flange, drive shaft, and hydraulic flow characteristics |
Techspecs — HENGYUHANG Tandem Hydraulic Gear Pump 3PD2F+2PDF SAE B 2-Bolt Series
Performance Data Across Displacements
Front Stage — Group 3 (3PD2F / 3PDF)
| 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) |
|---|---|---|---|---|---|---|---|---|
| 3PD2F-20 | 20.0 | 1.22 | 250 / 3,625 | 280 / 4,060 | 300 / 4,350 | 600 | 3,500 | 30.0 |
| 3PD2F-23 | 23.0 | 1.40 | 250 / 3,625 | 280 / 4,060 | 300 / 4,350 | 600 | 3,500 | 34.5 |
| 3PD2F-26 | 26.0 | 1.59 | 250 / 3,625 | 280 / 4,060 | 300 / 4,350 | 500 | 3,200 | 39.0 |
| 3PD2F-30 | 30.0 | 1.83 | 240 / 3,480 | 270 / 3,915 | 290 / 4,205 | 500 | 3,200 | 45.0 |
| 3PD2F-34 | 34.0 | 2.07 | 240 / 3,480 | 270 / 3,915 | 290 / 4,205 | 500 | 3,000 | 51.0 |
| 3PD2F-38 | 38.0 | 2.32 | 230 / 3,335 | 260 / 3,770 | 280 / 4,060 | 500 | 3,000 | 57.0 |
| 3PD2F-44 | 44.0 | 2.68 | 210 / 3,045 | 240 / 3,480 | 260 / 3,770 | 500 | 2,800 | 66.0 |
| 3PD2F-52 | 52.0 | 3.17 | 190 / 2,755 | 220 / 3,190 | 240 / 3,480 | 500 | 2,800 | 78.0 |
| 3PD2F-60 | 60.0 | 3.66 | 180 / 2,610 | 200 / 2,900 | 220 / 3,190 | 500 | 2,800 | 90.0 |
| 3PD2F-71 | 71.0 | 4.33 | 160 / 2,320 | 180 / 2,610 | 200 / 2,900 | 500 | 2,500 | 106.5 |
Rear Stage — Group 2 (2PDF)
| 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) |
|---|---|---|---|---|---|---|---|---|
| 2PDF-04 | 4.0 | 0.244 | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 700 | 4,000 | 6.00 |
| 2PDF-06 | 6.0 | 0.366 | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 700 | 4,000 | 9.00 |
| 2PDF-08 | 8.5 | 0.518 | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 700 | 3,800 | 12.75 |
| 2PDF-11 | 11.0 | 0.671 | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 600 | 3,800 | 16.50 |
| 2PDF-14 | 14.0 | 0.854 | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 600 | 3,500 | 21.00 |
| 2PDF-16 | 16.5 | 1.006 | 230 / 3,335 | 255 / 3,698 | 280 / 4,060 | 600 | 3,500 | 24.75 |
| 2PDF-19 | 19.5 | 1.189 | 210 / 3,045 | 235 / 3,408 | 260 / 3,770 | 500 | 3,200 | 29.25 |
| 2PDF-22 | 22.5 | 1.372 | 200 / 2,900 | 225 / 3,263 | 250 / 3,625 | 500 | 3,000 | 33.75 |
| 2PDF-26 | 26.0 | 1.586 | 180 / 2,610 | 205 / 2,973 | 230 / 3,335 | 500 | 3,000 | 39.00 |
| 2PDF-30 | 30.0 | 1.830 | 170 / 2,465 | 190 / 2,755 | 210 / 3,045 | 500 | 2,800 | 45.00 |
| 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 | Involute through-drive intermediate shaft | Input shaft maximum torque must satisfy: Ttotal = Tfront + Trear ≤ Tshaft_limit |
Advantages — HENGYUHANG Tandem Hydraulic Gear Pump 3PD2F+2PDF SAE B 2-Bolt Series
Direct SAE B 2-Bolt Drop-In Interchangeability
Manufactured to exact SAE J744 B 2-bolt oval mounting standards (pilot Ø 101.6 mm, bolt hole spacing 146.0 mm) with standard 13T involute splined or keyed drive shafts, providing zero-modification drop-in substitution across 27 leading hydraulic pump brands.
High-Power Density Multi-Circuit Capability
Integrates a heavy-duty Group 3 primary stage (up to 71 cm³/rev) with an agile Group 2 secondary stage (up to 30 cm³/rev), driving main actuator hydraulics and auxiliary steering/cooling systems from a single prime mover mounting pad.
Rugged Through-Drive Torque Transmission
Features an engineered intermediate through-drive spline coupling rated to transmit full combined working torque under continuous heavy-duty cyclic loading without driveline backlash or premature fatigue.
Superior Volumetric Efficiency (>94%)
Individual hydrostatic floating pressure balance thrust plates on both pump sections continuously compensate for mechanical wear and thermal expansion, guaranteeing minimal internal leakage and sustained high delivery flow.
Optimized Anti-Cavitation & Flexible Porting
Offers independent suction ports for segregated hydraulic fluid circuits or an optional common unified suction inlet, drastically simplifying machine plumbing and reservoir suction line routing.
Quiet Operation & Low Fluid Pulsation
Shaved and micro-finished alloy steel gear teeth minimize trapped oil entrapment and pressure ripple, dampening noise levels across mobile equipment cabins and industrial production environments.
Reference — HENGYUHANG Tandem Hydraulic Gear Pump 3PD2F+2PDF SAE B 2-Bolt Series
Series Architecture Across Group 3PD2F + Group 2PDF Tandem Combinations
The modular 3PD2F+2PDF tandem architecture pairs 10 front displacements with 10 rear displacements, generating over 100 standardized displacement combinations:
Heavy Primary Work Stage (Group 3PD2F): 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.
Secondary Auxiliary Stage (Group 2PDF): Displacements 4.0, 6.0, 8.5, 11.0, 14.0, 16.5, 19.5, 22.5, 26.0, and 30.0 cm³/rev for priority steering valves, pilot control systems, oil cooling fan motors, and auxiliary brake loops.
Comprehensive Interchangeability Matrix Across 27 Brands
The HENGYUHANG Tandem Hydraulic Gear Pump 3PD2F+2PDF SAE B 2-Bolt 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+PLP20 SAE B 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 3PD2F+2PDF SAE B 2-Bolt Tandem Gear Pump Series in strict compliance with international SAE J744 mounting interfaces and heavy-duty fluid power standards. Every tandem pump assembly undergoes 100% computerized end-of-line verification, including simultaneous dual-circuit continuous pressure hold, multi-speed volumetric efficiency mapping (>94%), through-drive torque integrity testing, and port thread gauge verification. Distributors, machine rebuilders, and equipment operators 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 through-drive spline interfaces, common inlet manifolds, and integrated pressure valves are fully supported with agile production schedules.
Applications — HENGYUHANG Tandem Hydraulic Gear Pump 3PD2F+2PDF SAE B 2-Bolt Series
Mobile Construction Machinery: Compact and mid-sized wheel loaders, backhoe loaders, skid steers, mini-excavators, and mobile trenchers requiring primary boom/bucket fluid delivery paired with independent power steering or pilot controls.
Agricultural Equipment: High-horsepower agricultural tractors, combine harvesters, forage harvesters, telescopic telehandlers, and forestry forwarders operating dual work circuits from a single engine drive pad.
Material Handling Equipment: Heavy-duty rough-terrain forklifts, container reach stackers, aerial boom lifts, and truck-mounted cranes requiring isolated main lift and auxiliary boom extension circuits.
Drilling & Mining Machinery: Hydraulic blast hole drill rigs, continuous underground miners, tunnel boring auxiliary systems, and crawler drill rigs.
Stationary Industrial Hydraulic Power Units (HPUs): Metal scrap balers, hydraulic compaction presses, plastic injection molding auxiliary clamp/eject systems, and machine tool lubrication and cooling loops.
Municipal & Environmental Vehicles: Refuse waste compactor trucks, street sweeping vacuum machines, sewer cleaner jetters, and road de-icing equipment.
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 | 42.0 × 26.0 × 24.0 cm (16.54 × 10.24 × 9.45 in) per tandem pump assembly. |
| Single Gross Weight | 10.50 to 18.20 kg (23.15 to 40.12 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 SAE J744 B 2-bolt oval flange, standard 13-tooth spline/keyed 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.
Hengyuhang Tandem Hydraulic Gear Pump 3PD2F+2PDF SAE B 2-Bolt Series (20~71 + 4~30 cm³/rev) is a heavy-duty modular dual-stage external gear pump engineered to provide dual independent fluid power streams or high-low differential delivery from a single prime mover. Built with an SAE J744 SAE B 2-bolt oval mounting flange (Ø101.6 mm centering pilot with 146.0 mm bolt center distance), this multi-section unit integrates a high-flow Group 3 front pump (3PD2F, 20.0 to 71.0 cm³/rev) with a versatile Group 2 rear pump (2PDF, 4.0 to 30.0 cm³/rev) via a high-torque internal spline through-drive intermediate coupling. Delivering combined displacement capacities from 24.0 up to 101.0 cm³/rev, the front stage handles continuous operating pressures up to 250 bar (peak up to 280 bar), while the rear stage operates at continuous pressures up to 250 bar (peak up to 300 bar). Engineered with high-strength extruded aluminium alloy housings, case-hardened alloy steel precision gears, and hydrostatic pressure-balanced DU composite bushings, this series delivers over 94% volumetric efficiency and serves as a direct 1:1 drop-in replacement for CASAPPA POLARIS (PLP30+PLP20), Bosch Rexroth (AZPN+AZPF), Marzocchi, Parker, and Danfoss dual gear pumps.
| Applications of Hengyuhang Tandem Hydraulic Gear Pump 3PD2F+2PDF SAE B 2-Bolt Series
The 3PD2F+2PDF SAE B 2-bolt tandem hydraulic gear pump is specifically engineered for multi-function mobile machinery and heavy industrial power systems requiring simultaneous high-flow primary power and independent secondary circuit control from a single engine or electric motor drive:
Agricultural Tractors & Harvesters: The high-flow front stage (3PD2F) supplies heavy hydraulic power to front-end loader arms, 3-point rear hitches, and high-demand hydraulic motor drives, while the secondary rear stage (2PDF) powers independent hydrostatic power steering, priority braking circuits, or auxiliary implement valves without flow interference.
Heavy Material Handling & Rough-Terrain Forklifts: Perfectly suited for 5-ton to 16-ton counterbalance forklifts, container reach stackers, and rough-terrain telehandlers. The primary 3PD2F stage drives main mast lift and lower cylinders at high speed, while the 2PDF stage provides smooth, dedicated pressure for mast tilt, hydraulic side-shift, fork positioning, and steering.
Mobile Construction & Earthmoving Equipment: Applied in medium wheel loaders, backhoe loaders, compact crawler excavators, motor graders, and articulated trench rollers where the front stage operates primary bucket/boom cylinders and the rear stage powers secondary pilot control, swing drives, or auxiliary attachments.
Dual-Speed High-Low Hydraulic Presses: Ideal for hydraulic metal stamping, rubber vulcanizing, and composite moulding presses. The combined flow of both stages (3PD2F + 2PDF) provides rapid approach speeds at low pressure; upon contacting the workpiece, the circuit unloads the high-flow front stage while the rear stage sustains maximum clamping pressure, saving substantial motor drive energy.
Waste Management & Municipal Specialty Trucks: Installed on rear-loading refuse compactor trucks, hook loaders, skip loaders, and municipal snowplows. The 3PD2F unit delivers fast cycle times for primary packer blade compaction or container hoist lifting, while the 2PDF unit powers bin tippers, tailgate latches, and plow angle adjustments.
Forestry & Timber Processing Machinery: Powers timber log splitters, forwarders, tree harvesters, and wood chippers, where the high-capacity front stage drives primary log feeding or main boom cranes, and the rear stage supplies constant hydraulic clamping pressure or saw-bar motor drive.
Stationary Heavy Industrial Power Units (HPUs): Used across scrap metal shears and balers, automated factory transfer lines, and injection moulding auxiliary circuits requiring dual isolated circuits with different pressure and flow requirements from a single electric bell-housing.
| Key Specifications Overview
| Parameter | Specification |
|---|---|
| Series Architecture | Modular Dual-Stage External Hydraulic Gear Pump (Group 3 Front 3PD2F + Group 2 Rear 2PDF) |
| Front Stage Displacement (3PD2F) | 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 (2PDF) | 4.0 ~ 30.0 cm³/rev (10 standard sizes: 4.0, 6.0, 8.5, 11.0, 14.0, 16.5, 19.5, 22.5, 26.0, 30.0 cm³/rev) |
| Total Combined Displacement Range | 24.0 ~ 101.0 cm³/rev (fully modular independent displacement selection: V1 + V2) |
| Continuous Operating Pressure (P1) | Front (3PD2F): 180 ~ 250 bar (250 bar for 20~26 cc) / Rear (2PDF): 170 ~ 250 bar (250 bar for 4~14 cc) |
| Intermittent Operating Pressure (P2) | Front (3PD2F): 200 ~ 265 bar / Rear (2PDF): 190 ~ 275 bar |
| Max. Peak Pressure (P3) | Front (3PD2F): 220 ~ 280 bar / Rear (2PDF): 210 ~ 300 bar |
| Operating Speed Range | 500 ~ 3000 r/min (up to 3500 r/min for smaller displacement pairings) |
| Volumetric Efficiency | ≥ 94% across rated pressure and operating thermal envelope |
| Mounting Flange Standard | SAE J744 SAE B 2-bolt oval flange (Ø101.6 mm / 4.0 in pilot, 146.0 mm / 5.748 in bolt center distance, 2 × Ø14.3 mm holes) |
| Primary Drive Shaft Options | SAE B cylindrical straight keyed shaft (Ø22.22 mm / 7/8 in with 6.35 mm key) or SAE B 13-tooth involute spline (16/32 DP, 30° pressure angle) |
| Intermediate Coupling Mechanism | High-strength hardened alloy steel internal spline through-drive coupling shaft connecting Group 3 and Group 2 gear sets |
| Port Configuration Options | Independent suction & pressure ports (SAE Code 61 split flange, SAE O-ring boss UNF threads, or BSPP gas threads); common inlet available |
| Rotation Direction | Clockwise (D / Right-Hand) standard; Counter-Clockwise (S / Left-Hand) available upon request |
| Operating Temperature Range | -20°C to +85°C (standard NBR seals); -15°C to +110°C (optional Viton FKM seals) |
| Technical Performance Matrix Across Available Stages
| Primary Front Stage: Group 3 (3PD2F) | Secondary Rear Stage: Group 2 (2PDF) | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Model Code | Displ. (cm³/rev) | P1 (bar) | P3 (bar) | Flow @ 1500 rpm | Model Code | Displ. (cm³/rev) | P1 (bar) | P3 (bar) | Flow @ 1500 rpm |
| 3PD2F-20 | 20.0 | 250 | 280 | 30.0 L/min | 2PDF-04 | 4.0 | 250 | 300 | 6.0 L/min |
| 3PD2F-26 | 26.0 | 250 | 280 | 39.0 L/min | 2PDF-06 | 6.0 | 250 | 300 | 9.0 L/min |
| 3PD2F-33 | 33.0 | 230 | 270 | 49.5 L/min | 2PDF-08 | 8.5 | 250 | 300 | 12.8 L/min |
| 3PD2F-39 | 39.0 | 230 | 270 | 58.5 L/min | 2PDF-11 | 11.0 | 250 | 300 | 16.5 L/min |
| 3PD2F-46 | 46.0 | 230 | 270 | 69.0 L/min | 2PDF-14 | 14.0 | 250 | 300 | 21.0 L/min |
| 3PD2F-50 | 50.0 | 220 | 260 | 75.0 L/min | 2PDF-16 | 16.5 | 230 | 280 | 24.8 L/min |
| 3PD2F-55 | 55.0 | 200 | 250 | 82.5 L/min | 2PDF-19 | 19.5 | 210 | 260 | 29.3 L/min |
| 3PD2F-63 | 63.0 | 200 | 250 | 94.5 L/min | 2PDF-22 | 22.5 | 200 | 250 | 33.8 L/min |
| 3PD2F-71 | 71.0 | 180 | 220 | 106.5 L/min | 2PDF-30 | 30.0 | 170 | 210 | 45.0 L/min |
| 1:1 Direct-Fit OEM Brand Replacement Coverage
| Original Manufacturer | Direct-Fit Drop-In Tandem Equivalent Series |
|---|---|
| CASAPPA | POLARIS Dual Series (PLP30 + PLP20 / PL30 + PL20 with SAE B 2-bolt flange) |
| Bosch Rexroth | AZPN-1X + AZPF-1X Group 3 + Group 2 multiple gear pumps (SAE B 2-bolt mounting) |
| MARZOCCHI | 3P + 2P / ALP3 + ALP2 / GHP3 + GHP2 SAE B modular tandem external gear pumps |
| PARKER Hannifin | PGP517 + PGP511 / PGP620 + PGP511 SAE B multiple section external gear pumps |
| DANFOSS / Turolla | SNP3NN + SNP2NN Group 3 + Group 2 dual external gear pumps (SAE B mounting) |
| VIVOLO (Vivoil) | XV-3P + XV-2P multiple section external gear pumps (SAE B flange) |
| SALAMI | 3PB + 2PB / 3PE + 2PE dual gear pumps with SAE B 2-bolt pilot |
| Technical Performance Matrix Across Available Stages
| Primary Front Stage: Group 3 (3PD2F) | Secondary Rear Stage: Group 2 (2PDF) | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Model Code | Displ. (cm³/rev) | P1 (bar) | P3 (bar) | Flow @ 1500 rpm | Model Code | Displ. (cm³/rev) | P1 (bar) | P3 (bar) | Flow @ 1500 rpm |
| 3PD2F20 | 20.0 | 250 | 280 | 30.0 L/min | 2PDF4 | 4.0 | 250 | 300 | 6.0 L/min |
| 3PD2F26 | 26.0 | 250 | 280 | 39.0 L/min | 2PDF6 | 6.0 | 250 | 300 | 9.0 L/min |
| 3PD2F33 | 33.0 | 230 | 270 | 49.5 L/min | 2PDF8 | 8.5 | 250 | 300 | 12.8 L/min |
| 3PD2F39 | 39.0 | 230 | 270 | 58.5 L/min | 2PDF11 | 11.0 | 250 | 300 | 16.5 L/min |
| 3PD2F46 | 46.0 | 230 | 270 | 69.0 L/min | 2PDF14 | 14.0 | 250 | 300 | 21.0 L/min |
| 3PD2F50 | 50.0 | 220 | 260 | 75.0 L/min | 2PDF16 | 16.5 | 230 | 280 | 24.8 L/min |
| 3PD2F55 | 55.0 | 200 | 250 | 82.5 L/min | 2PDF19 | 19.5 | 210 | 260 | 29.3 L/min |
| 3PD2F63 | 63.0 | 200 | 250 | 94.5 L/min | 2PDF22 | 22.5 | 200 | 250 | 33.8 L/min |
| 3PD2F71 | 71.0 | 180 | 220 | 106.5 L/min | 2PDF30 | 30.0 | 170 | 210 | 45.0 L/min |
| Original Manufacturer | Direct-Fit Drop-In Tandem Equivalent Series |
|---|---|
| CASAPPA | POLARIS Dual Series (PLP30 + PLP20 / PL30 + PL20 with SAE B 2-bolt flange) |
| Bosch Rexroth | AZPN-1X + AZPF-1X Group 3 + Group 2 multiple gear pumps (SAE B 2-bolt mounting) |
| MARZOCCHI | 3P + 2P / ALP3 + ALP2 / GHP3 + GHP2 SAE B modular tandem external gear pumps |
| PARKER Hannifin | PGP517 + PGP511 / PGP620 + PGP511 SAE B multiple section external gear pumps |
| DANFOSS / Turolla | SNP3NN + SNP2NN Group 3 + Group 2 dual external gear pumps (SAE B mounting) |
| VIVOLO (Vivoil) | XV-3P + XV-2P multiple section external gear pumps (SAE B flange) |
| SALAMI | 3PB + 2PB / 3PE + 2PE dual gear pumps with SAE B 2-bolt pilot |
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