Gear pump
Tandem Hydraulic Gear Pump 2PDF+2PDF Euro 4 Bolt Series
Hengyuhang Tandem Hydraulic Gear Pump 2PDF+2PDF EURO 4 BOLT Series is a heavy-duty dual-stage external gear pump uniting two Group 2 displacement sections on a standard European 4-bolt rectangular mount to deliver synchronized or independent high-pressure fluid power up to 300 bar.
| Applications of Hengyuhang Tandem Hydraulic Gear Pump 2PDF+2PDF EURO 4 BOLT Series
This Group 2 dual-stage gear pump series is specifically engineered for high-demand mobile equipment and industrial machinery requiring substantial hydraulic power across two separate working circuits. Common applications include medium-sized excavators, backhoe loaders, wheel loaders, agricultural harvesters, forestry logging machinery, truck-mounted cranes, waste compactor trucks, drilling rigs, and heavy-duty industrial hydraulic power packs powering multiple cylinder and hydraulic motor circuits from a single engine PTO or electric motor.
| Key Technical Specifications
Product Model: Hengyuhang Tandem Hydraulic Gear Pump 2PDF+2PDF EURO 4 BOLT Series
Brand Replacement: Marzocchi, Danfoss, Rexroth, Parker OEM or as requested.
Displacement: 4.0+4.0 to 30.0+30.0 cm³/rev (Stage 1 + Stage 2)
Rotation Direction: Clockwise (D), counter-clockwise (S)
Speed Range: Min. speed 500 to 700 r/min; Max. speed 2500 to 3500 r/min
Peak Pressure: 200 to 300 bar (2,900 to 4,350 psi)
- Description
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| Overview of HENGYUHANG Tandem Hydraulic Gear Pump 2PDF+2PDF EURO 4 BOLT Series
The HENGYUHANG 2PDF+2PDF EURO 4 BOLT Series pairs two robust Group 2 (2PDF) hydraulic external gear pump sections via a high-torque through-drive shaft and heavy-duty internal splined coupling. Operating from a standardized European 4-bolt rectangular front mounting flange (pilot Ø 36.5 mm), this tandem configuration allows equipment builders to supply high-pressure hydraulic flow to two independent circuits simultaneously or combine both stages into a single high-flow circuit without requiring dual drive motors, bulky splitter gearboxes, or complex flow-divider valving.
Both primary (P1) and secondary (P2) pump sections feature high-tensile extruded aluminum alloy gear housings, high-grade cast iron front mounting flanges, and heavy-duty intermediate adapter covers. The precision-machined, case-hardened alloy steel gears and floating hydrostatic pressure-balanced thrust plates deliver superior volumetric efficiency exceeding 94% across varying thermal and pressure cycles. Displacements for both stages range from 4.0 to 30.0 cm³/rev across 10 nominal sizes, supporting continuous operating pressures up to 250 bar (3,625 psi) and maximum peak pressures up to 300 bar (4,350 psi). Available with separate suction ports or an enlarged shared common suction port, the 2PDF+2PDF EURO 4 BOLT Series provides verified 1:1 drop-in interchangeability across 27 global hydraulic manufacturers.
| Dimension of HENGYUHANG Tandem Hydraulic Gear Pump 2PDF+2PDF EURO 4 BOLT Series
Interface data needed with the drawing:
| Item | Value |
|---|---|
| Primary mounting flange | European standard 4-bolt rectangular mounting flange (pilot Ø 36.5 -0.025/-0.050 mm with 71.5 × 96.2 mm bolt pitch, 4-Ø 9.0 mm through holes). |
| Primary drive shaft options | 1. European 1:8 tapered shaft with woodruff key (M12×1.5 nut, key width 3.15 mm or 4.0 mm) / 2. Cylindrical keyed shaft: Ø 15.87 mm (5/8 in) or Ø 19.05 mm (3/4 in) with precision flat key / 3. Involute splined shaft: DIN 5482 B17×14 or SAE 9T / 11T (16/32 DP) |
| Intermediate through-drive coupling | High-strength alloy steel internal splined sleeve coupling connecting primary rear shaft to secondary input shaft; rated for full tandem torque transmission. |
| Suction port options (Inlet) | 1. Separate suction: independent inlet ports for Stage 1 and Stage 2 / 2. Common suction: single enlarged common inlet port on Stage 1 body supplying both pumping chambers, eliminating redundant reservoir piping |
| Port configurations | 1. European standard diamond 4-bolt flanged ports (M6 or M8 threads with O-ring groove) / 2. BSPP parallel threaded ports (G 1/2, G 3/4, G 1) / 3. SAE straight thread O-ring boss ports (UNF/UN threads) |
| Rotation | Clockwise (R / D) or Counter-clockwise (L / S), viewed looking directly at the primary drive shaft. |
| Body construction | High-tensile extruded aluminum alloy gear bodies with heavy-duty cast iron front mounting flange and intermediate/rear adapter plates. |
| Shaft loading limits | Pure torsional torque transmission required via flexible elastic coupling; zero external axial or radial loads permitted on the primary shaft. |
| Fastener torque limits | Front flange mounting bolts: 45 ±3 Nm; Body assembly tie-bolts: 45 ±3 Nm; Port flange screws: M6 = 10 ±1 Nm, M8 = 24 ±2 Nm. |
| Pump Installation Specifications HENGYUHANG 2PDF+2PDF EURO 4 BOLT Series
The HENGYUHANG 2PDF+2PDF EURO 4 BOLT Series utilizes a standardized modular ordering code structure:
Code structure — reference: 2PDF+2PDF — Tandem Hydraulic External Gear Pump Euro 4-Bolt Series
| Segment | Meaning | Standard Options & Features |
|---|---|---|
| Series | 2PDF+2PDF | Dual-stage Group 2 + Group 2 tandem external gear pump assembly |
| Displacement P1 | 4 to 30 | Primary stage (Group 2): 4.0, 6.0, 8.5, 11.0, 14.0, 16.5, 19.5, 22.5, 26.0, 30.0 cm³/rev |
| Displacement P2 | 4 to 30 | Secondary stage (Group 2): 4.0, 6.0, 8.5, 11.0, 14.0, 16.5, 19.5, 22.5, 26.0, 30.0 cm³/rev |
| Rotation | D / S | D: Clockwise (viewed from drive shaft end); S: Counter-clockwise |
| Drive Shaft | T1 / C1 / S1 | T1: European 1:8 tapered shaft; C1: Cylindrical keyed shaft; S1: Involute splined shaft |
| Mounting Flange | E4 | E4: European standard 4-bolt rectangular flange (pilot Ø 36.5 mm, 71.5 × 96.2 mm) |
| Suction Config | S / C | S: Separate inlets for P1 and P2; C: Common suction port for shared reservoir line |
| Ports | F / B / U | F: European diamond 4-bolt flanged ports; B: BSPP threaded ports; U: SAE O-ring boss ports |
| Seals | N / V | N: Standard NBR (-20 °C to +80 °C); V: FKM / Viton (-10 °C to +150 °C) |
| Reading your replacement code
| Your Target Brand & Series | HENGYUHANG Equivalent | Interchange Verification Notes |
|---|---|---|
| MARZOCCHI GHP2A, ALP2A, GHP2, ALP2, 1PD Series | HENGYUHANG 2PDF+2PDF Series | 100% 1:1 drop-in replacement; identical Group 2 Euro 4-bolt front flange, 1:8 taper shaft, port centers, and tandem body length |
| DANFOSS SNP1NN, SNP2NN, SNW2NN Series | HENGYUHANG 2PDF+2PDF Series | Direct form, fit, and functional replacement; matching displacement combinations and continuous 250 bar pressure ratings |
| HYDAC PGE102, PGE104 Series | HENGYUHANG 2PDF+2PDF Series | Fully interchangeable mounting pilot, bolt circles, shaft splines, and intermediate through-drive coupling |
| ARGO-HYTOS GP1, GP2, GP3 Series | HENGYUHANG 2PDF+2PDF Series | Exact match across nominal displacements, flange patterns, and pressure capabilities |
| ATOS PFG Series | HENGYUHANG 2PDF+2PDF Series | Plug-and-play installation; matching European 4-bolt flange and 1:8 tapered shaft options |
| Brevini OT100, OT200, OT300 Series | HENGYUHANG 2PDF+2PDF Series | Direct replacement for multi-function mobile auxiliary and work hydraulic systems |
| BUCHER AP100, AP200, AP212, AP300 Series | HENGYUHANG 2PDF+2PDF Series | High volumetric efficiency, low noise output, and identical mechanical port centerlines |
| BONDIOLI & PAVESI HPLPA1, HPLPA2, HPLPA3 Series | HENGYUHANG 2PDF+2PDF Series | Direct agricultural and industrial tractor drop-in tandem replacement |
| Boden BAP1, BHP1, BAP2, BHP2, BAP3, BHP3 Series | HENGYUHANG 2PDF+2PDF Series | Exact displacement matching, port dimensions, and continuous 250 bar pressure ratings |
| Caproni 10A, 20A, 30A, 10C, 20C, 30C Series | HENGYUHANG 2PDF+2PDF Series | Full mechanical interchangeability; matching shaft keys, flange pilots, and body lengths |
| CASAPPA PLP10, PLP20, PLP30 (Polaris) Series | HENGYUHANG 2PDF+2PDF Series | 100% drop-in tandem replacement for PLP20/20 double pump configurations |
| CONCENTRIC WP300, WP900, WP1500 Series | HENGYUHANG 2PDF+2PDF Series | Equivalent flow delivery, mounting dimensions, and high-speed operation up to 3500 rpm |
| DUPLOMATIC 1P, GP1, GP2, GP3 Series | HENGYUHANG 2PDF+2PDF Series | Direct industrial power unit and machine tool tandem replacement |
| Galtech 1SPA, 2SPA, 3GPG, 3SPA Series | HENGYUHANG 2PDF+2PDF Series | Exact match on mounting flange, shaft tapers, and flanged port pitch |
| GRH 1PF, 2PF, 3PF Series | HENGYUHANG 2PDF+2PDF Series | Direct drop-in match across all Group 2 + Group 2 displacement combinations |
| HANSA-TMP 1SP, 2SP, 3GPG, 3SPA Series | HENGYUHANG 2PDF+2PDF Series | 100% interchangeable fluid power parameters and compact axial body length |
| HESPER HA11, HA2, HA3, CHP1 Series | HENGYUHANG 2PDF+2PDF Series | Direct replacement for mobile work circuits and steering priority systems |
| HONOR 1KH Series | HENGYUHANG 2PDF+2PDF Series | Drop-in dimensional envelope and identical hydraulic port positions |
| HPI P1BAN1, P1BAN2, P1AAN2, P1BAN3, P1AAN3 Series | HENGYUHANG 2PDF+2PDF Series | Exact replacement for French/European mobile machinery standards |
| HYDRONIT E Series | HENGYUHANG 2PDF+2PDF Series | Perfect fit for dual-function electro-hydraulic power packs and compact work circuits |
| JIHOSTROJ P23, J, T3, Q2, UD Series | HENGYUHANG 2PDF+2PDF Series | Exact drop-in replacement for Czech/Central European machinery |
| PARKER PGP505, PGP502, PGP511, PGP517 Series | HENGYUHANG 2PDF+2PDF Series | Direct replacement for Parker Group 2 + Group 2 tandem gear pumps |
| Rexroth AZPB, AZPF, AZPG, AZPN Series | HENGYUHANG 2PDF+2PDF Series | 100% compatible drop-in replacement for Rexroth double gear pumps |
| RONZIO 01ZAG, 01ZBG, 02ZAG, 02ZCG, 02ZLG Series | HENGYUHANG 2PDF+2PDF Series | Exact match on aluminum body geometry, flange pilots, and shaft splines |
| ROQUET 1L0, PLA, GZ, G, GLA, PLC Series | HENGYUHANG 2PDF+2PDF Series | Direct drop-in replacement for Spanish and international agricultural equipment |
| SDH CBD Series | HENGYUHANG 2PDF+2PDF Series | Equivalent pressure levels, displacement sizes, and mounting dimensions |
| VIVOLO X1P, XV-1P, X2P, X3P, XV-2P, XV-3P Series | HENGYUHANG 2PDF+2PDF Series | Direct replacement for Vivoil Group 2 + Group 2 single and tandem external gear pumps |
Techspecs — HENGYUHANG 2PDF+2PDF EURO 4 BOLT Series
Group 2 Displacement Technical Data (Applicable to Both Stage 1 and Stage 2)
| Displacement Size (cm³/rev) | Rated Continuous Pressure p1 (bar) | Intermittent Pressure p2 (bar) | Maximum Peak Pressure p3 (bar) | Max. Speed (r/min) | Min. Speed (r/min) | Flow Rate per Stage @ 1500 r/min (l/min) | Flow Rate per Stage @ 3000 r/min (l/min) |
|---|---|---|---|---|---|---|---|
| 4.0 | 250 | 275 | 300 | 3,500 | 700 | 6.0 | 12.0 |
| 6.0 | 250 | 275 | 300 | 3,500 | 700 | 9.0 | 18.0 |
| 8.5 | 250 | 275 | 300 | 3,500 | 600 | 12.75 | 25.5 |
| 11.0 | 250 | 275 | 300 | 3,500 | 600 | 16.5 | 33.0 |
| 14.0 | 250 | 275 | 300 | 3,500 | 500 | 21.0 | 42.0 |
| 16.5 | 230 | 255 | 280 | 3,000 | 500 | 24.75 | 49.5 |
| 19.5 | 210 | 235 | 260 | 3,000 | 500 | 29.25 | 58.5 |
| 22.5 | 190 | 215 | 240 | 2,800 | 500 | 33.75 | 67.5 |
| 26.0 | 170 | 195 | 220 | 2,500 | 500 | 39.0 | 78.0 |
| 30.0 | 160 | 180 | 200 | 2,500 | 500 | 45.0 | 90.0 |
| Note: In the 2PDF+2PDF assembly, Stage 1 (P1) and Stage 2 (P2) can feature identical displacements (e.g., 2PDF-14+2PDF-14, 2PDF-22.5+2PDF-22.5) or differential displacements (e.g., 2PDF-26+2PDF-11, 2PDF-19.5+2PDF-8.5). Maximum operational speed of the tandem unit is limited by the largest displacement section selected. Total operating drive torque across both stages must not exceed the maximum allowable torque rating of the primary drive shaft and intermediate splined coupling. | |||||||
Operating Conditions & Fluid Specifications
| Parameter | Specification | Operating Range & Criteria |
|---|---|---|
| Hydraulic fluid | Mineral hydraulic oil | Mineral-based anti-wear hydraulic oil conforming to DIN 51524 part 2 (HLP) or part 3 (HVLP) |
| Operating fluid temperature | Standard range | -20 °C to +80 °C with NBR seals; -10 °C to +110 °C with optional FKM / Viton seals |
| Operating viscosity | Recommended range | ν = 20 to 80 mm²/s (cSt); Permissible operating range: ν = 10 to 1,000 mm²/s |
| Cold start viscosity limit | Maximum viscosity | ν_max ≤ 1,500 mm²/s at p ≤ 10 bar and speed ≤ 1,500 r/min |
| Suction port pressure | Inlet pressure range | p_inlet = 0.7 to 2.5 bar absolute (0.07 to 0.25 MPa absolute) to prevent suction cavitation |
| Fluid cleanliness level | Maximum contamination | Class 20/18/15 according to ISO 4406 or Class 9 according to NAS 1638 |
| Recommended filtration | Filter rating | Return line filtration β10 ≥ 75 or pressure filtration β25 ≥ 100 |
Advantages — HENGYUHANG 2PDF+2PDF EURO 4 BOLT Series
High Dual-Flow Capacity (Up to 30+30 cm³/rev)
Delivers substantial fluid power to two independent heavy-duty circuits (up to 90 l/min total at 1500 rpm or 180 l/min at 3000 rpm) from a single engine PTO or electric motor.
Rigid European 4-Bolt Rectangular Mounting
Standardized European pilot Ø 36.5 mm and 71.5 × 96.2 mm 4-bolt pattern provides maximum torsional rigidity and resistance against severe vibration in mobile machinery.
High Volumetric Efficiency (>94%)
Individual hydrostatic thrust balance plates in both stages automatically compensate for axial clearances, ensuring peak volumetric efficiency even under high temperature and fluctuating pressures.
Circuit Isolation or Combined Flow Flexibility
Supplies two entirely isolated hydraulic circuits with different operating pressures, or combines flow via directional valves for high-speed cylinder extension.
Integrated Common Suction Option
Minimizes hydraulic tank suction lines, port adapters, and reservoir hose routing by utilizing a single enlarged inlet port on the primary body.
Extensive Interchangeability Across 27 Global Brands
Conforms to European standard dimensional envelopes, providing 100% 1:1 plug-and-play replacement for MARZOCCHI, DANFOSS, Rexroth, PARKER, and 23 other international manufacturers.
Reference — HENGYUHANG 2PDF+2PDF EURO 4 BOLT Series
Series Architecture
The HENGYUHANG 2PDF+2PDF EURO 4 BOLT Series provides modular flexibility across 10 Group 2 displacement sizes:
Stage 1 (2PDF Group 2): 4.0, 6.0, 8.5, 11.0, 14.0, 16.5, 19.5, 22.5, 26.0, 30.0 cm³/rev
Stage 2 (2PDF Group 2): 4.0, 6.0, 8.5, 11.0, 14.0, 16.5, 19.5, 22.5, 26.0, 30.0 cm³/rev
Common Popular Combinations: 2PDF-8.5+2PDF-8.5, 2PDF-11+2PDF-11, 2PDF-14+2PDF-8.5, 2PDF-14+2PDF-14, 2PDF-19.5+2PDF-11, 2PDF-22.5+2PDF-14, 2PDF-26+2PDF-16.5, 2PDF-30+2PDF-14
Target Brand Interchangeability Matrix
The HENGYUHANG 2PDF+2PDF EURO 4 BOLT Series is engineered to provide verified 1:1 drop-in replacement across 27 leading international hydraulic brands:
MARZOCCHI: GHP2A, ALP2A, GHP2, ALP2, 1PD Series (Tandem double pump combinations)
DANFOSS: SNP1NN, SNP2NN, SNW2NN Tandem Series
HYDAC: PGE102, PGE104 Series
ARGO-HYTOS: GP1, GP2, GP3 Double Gear Pump Series
ATOS: PFG Series Double Pumps
Brevini: OT100, OT200, OT300 Series Tandem Gear Pumps
BUCHER: AP100, AP200, AP212, AP300 Series Double Pumps
BONDIOLI & PAVESI: HPLPA1, HPLPA2, HPLPA3 Tandem Series
Boden: BAP1, BHP1, BAP2, BHP2, BAP3, BHP3 Series
Caproni: 10A, 20A, 30A, 10C, 20C, 30C Series
CASAPPA: PLP10, PLP20, PLP30 (Polaris PLP20/20) Series
CONCENTRIC: WP300, WP900, WP1500 Series
DUPLOMATIC: 1P, GP1, GP2, GP3 Series Tandem
Galtech: 1SPA, 2SPA, 3GPG, 3SPA Series
GRH: 1PF, 2PF, 3PF Series Double Pumps
HANSA-TMP: 1SP, 2SP, 3GPG, 3SPA Series
HESPER: HA11, HA2, HA3, CHP1 Series
HONOR: 1KH Series
HPI: P1BAN1, P1BAN2, P1AAN2, P1BAN3, P1AAN3 Series
HYDRONIT: E Series Mini Power Pack Pumps
JIHOSTROJ: P23, J, T3, Q2, UD Series
PARKER: PGP505, PGP502, PGP511, PGP517 Series
Rexroth: AZPB, AZPF, AZPG, AZPN Series Double Gear Pumps
RONZIO: 01ZAG, 01ZBG, 02ZAG, 02ZCG, 02ZLG Series
ROQUET: 1L0, PLA, GZ, G, GLA, PLC Series
SDH: CBD Series
VIVOLO: X1P, XV-1P, X2P, X3P, XV-2P, XV-3P Series
Brand Replacement
Quanzhou Hengyuhang Power Technology Co., Ltd. manufactures the 2PDF+2PDF EURO 4 BOLT Series conforming strictly to European standard rectangular flange mounting patterns. Every manufactured unit undergoes computerized end-of-line digital testing, verifying individual stage displacement, continuous rated pressure holding, inter-stage seal barrier isolation, and overall mechanical efficiency. Machine builders, hydraulic system integrators, and plant maintenance managers can directly replace OEM double pumps across all 27 specified brands (MARZOCCHI, DANFOSS, HYDAC, ARGO-HYTOS, ATOS, Brevini, BUCHER, BONDIOLI & PAVESI, Boden, Caproni, CASAPPA, CONCENTRIC, DUPLOMATIC, Galtech, GRH, HANSA-TMP, HESPER, HONOR, HPI, HYDRONIT, JIHOSTROJ, PARKER, Rexroth, RONZIO, ROQUET, SDH, VIVOLO) with zero modifications to drive bells, shaft couplings, or hydraulic line geometry.
Applications — HENGYUHANG 2PDF+2PDF EURO 4 BOLT Series
Mobile Construction & Earthmoving Machinery: Dual high-flow circuits powering boom lift cylinders, swing drive motors, and auxiliary trenching or hammer attachments.
Agricultural Harvesters & Heavy Tractors: Primary stage drives main steering and braking priority; secondary stage powers heavy header lift and hydraulic motor drives.
Truck-Mounted Cranes & Aerial Work Platforms: Independent flow to outrigger stabilization jacks and main boom extension winches.
Refuse Compactor Trucks & Municipal Equipment: Dedicated circuits for high-pressure tailgate compaction packing cycles and bin lifter arms.
Heavy Industrial Hydraulic Power Units: Dual-stage feed for high-speed low-pressure cylinder advance followed by high-pressure clamping in metal forming and pressing equipment.
Package & Shipping
| Packaging | Individual shock-absorbing custom molded foam in heavy-duty export cartons; moisture-resistant VCI polybags; fumigation-free wooden export pallets for consolidated freight. |
|---|---|
| Selling Unit | Single item (MOQ: 1 piece for standard stock models; low MOQ for customized OEM tandem assemblies). |
| Single Package Size | 38.0 × 26.0 × 24.0 cm (14.96 × 10.24 × 9.45 in) per tandem pump. |
| Single Gross Weight | 6.50 to 10.50 kg (14.33 to 23.15 lbs) depending on displacement combinations. |
| Standard Lead Time | 3–5 business days for stock items; 12–15 business days for volume OEM batch customization. |
| Logistics & Express | Worldwide air express (DHL, FedEx, UPS, TNT), air cargo, maritime shipping (LCL / FCL), and multimodal door-to-door DDP services. |
| Customization Services | Custom laser nameplate marking, private branding, common or separate suction port routing, customized shaft splines, and special seal compounds. |
| Warranty & Support | 12 months comprehensive warranty from dispatch date; full lifetime technical support. |
Why Choose Hengyuhang?
Direct Factory Precision Manufacturing & CNC Excellence: Equipped with multi-axis CNC machining centers, automated high-speed gear hobbing, and ultra-fine micro-lapping equipment, Hengyuhang maintains sub-micron gear profile tolerances (Ra < 0.2 μm) and exact balance plate clearances. This guarantees minimal internal bypass leakage, virtually zero pressure pulsation, and repeatable performance across high-volume production batches.
100% Full-Cycle Multi-Parameter Factory Inspection: Every single hydraulic pump undergoes rigorous end-of-line digital testing before dispatch. Quality checks cover full continuous rated and peak pressure hold, internal bypass leakage verification, inter-stage seal barrier testing, high/low temperature volumetric efficiency testing (>92–94%), and acoustic noise spectrum profiling, ensuring zero-defect delivery.
Seamless 1:1 OEM Drop-In Interchangeability: Conforming precisely to international European standard, SAE, and DIN/ISO mounting configurations, our pumps deliver genuine plug-and-play replacement for MARZOCCHI, DANFOSS, Rexroth, PARKER, and 23 other leading global manufacturers. Machine operators can replace original units without modifying bell housings, drive couplings, or hydraulic line geometry.
Flexible Engineering Customization & Rapid Prototyping: Backed by an experienced in-house hydraulic engineering team, Hengyuhang offers comprehensive bespoke customization, including non-standard mounting flanges, special shaft tapers or splines, common or separate suction port routing, and integrated valve blocks. We support low-MOQ trial orders and agile custom prototyping to resolve obsolescence issues for high-end machinery.
Robust Supply Chain, Extensive Inventory & Fast Global Dispatch: With dedicated casting, extrusion, and precision machining facilities, raw material reserves, and extensive finished inventory across all Group 2 displacement models, standard orders ship within 48 to 72 hours. We partner strategically with major international logistics carriers to provide seamless door-to-door DDP global delivery.
12-Month Comprehensive Warranty & Lifetime Technical Support: All Hengyuhang hydraulic pumps are backed by a complete 12-month factory warranty and dedicated lifetime technical assistance. Our specialized fluid power engineers provide free 24-hour CAD drawing verification, OEM cross-reference confirmation, hydraulic displacement calculations, and system troubleshooting to ensure total operational peace of mind.
Tandem Hydraulic Gear Pump Group 2PDF+2PDF Euro 4-Bolt Series (4.0+4.0 to 30.0+30.0 cm³/rev) is a heavy-duty modular dual-stage external gear pump engineered to supply two high-pressure hydraulic circuits or provide combined dual-stage high-low flow from a single prime mover. By coupling two Group 2PDF pump bodies through a high-torque internal spline intermediate through-drive shaft, this two-stage tandem unit enables independent displacement sizing across 10 standard displacements from 4.0 up to 30.0 cm³/rev for both the front and rear sections (total combined displacement up to 60.0 cm³/rev). Built with high-density extruded aircraft-grade aluminium alloy bodies, case-hardened micro-finished alloy steel gear sets, and hydrostatic axial pressure-balanced composite DU bushings, the 2PDF+2PDF tandem pump delivers continuous operating pressures up to 250 bar (peak pressures up to 300 bar) on smaller-to-medium displacements and up to 170~230 bar on larger frame sizes. Featuring a standard European 4-bolt rectangular mounting flange (71.5 × 96.0 mm pattern with Ø36.5 mm centering pilot), European 1:8 taper drive shaft with woodruff key (M12×1.25), European standard 4-bolt diamond flanged ports, and independent or shared suction port configurations, this series maintains over 94% volumetric efficiency and provides a seamless 1:1 drop-in replacement for CASAPPA POLARIS (PLP20+PLP20), Bosch Rexroth (AZPF+AZPF), Marzocchi, Parker, and Danfoss dual Group 2 gear pumps.
| Applications
The 2PDF+2PDF Euro 4-bolt tandem gear pump series is specifically designed for multi-actuator mobile machinery and industrial hydraulic power units that demand high continuous pressure across dual independent circuits, including medium-to-large agricultural tractors (front-end loader implements plus rear auxiliary 3-point hitch and hydraulic steering), counterbalance forklifts and reach trucks (main mast lifting combined with tilt/attachment clamping and power steering), mini and medium wheel loaders, compact excavators, dual-speed high-low hydraulic presses (high-flow rapid approach and high-pressure forming/holding), waste compactor trucks, hook loaders, telehandlers, and industrial manufacturing hydraulic power units (HPUs) driving multiple automated actuator circuits from a single electric motor.
| Key Specifications Overview
| Parameter | Specification |
|---|---|
| Series Architecture | Modular Dual-Stage External Hydraulic Gear Pump (Group 2PDF Front + Group 2PDF Rear) |
| Front Stage Displacement Range | 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) |
| Rear Stage Displacement Range | 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 | 8.0 ~ 60.0 cm³/rev (modular independent stage pairing: V1 + V2) |
| Continuous Operating Pressure (P1) | 170 ~ 250 bar (250 bar for 4.0~14.0 cc; 230 bar for 16.5 cc; 210 bar for 19.5 cc; 200 bar for 22.5 cc; 180 bar for 26.0 cc; 170 bar for 30.0 cc) |
| Intermittent Operating Pressure (P2) | 190 ~ 275 bar (model dependent) |
| Max. Peak Pressure (P3) | 210 ~ 300 bar (model dependent) |
| Operational Speed Range | 500 ~ 4000 r/min (500~2800 r/min on 30.0 cc; 500~3000 r/min on 22.5~26.0 cc; 600~3500 r/min on 14.0~16.5 cc; 700~4000 r/min on 4.0~8.5 cc) |
| Volumetric Efficiency | ≥ 94% across rated pressure and thermal operating envelope |
| Hydro-Mechanical Efficiency | ≥ 89% ~ 92% |
| Body & Housing Construction | High-tensile extruded aluminium alloy body with spheroidal ductile cast-iron front mounting flange, intermediate adapter, and rear cover |
| Mounting Flange Standard | Standard European 4-bolt rectangular flange (bolt pattern 71.5 × 96.0 mm, centering pilot Ø36.5 mm, 4 × M8 clearance holes) |
| Drive Shaft Standard | European standard 1:8 taper shaft with woodruff key and M12×1.25 threaded end (tightening torque 45 ± 3 Nm) |
| Intermediate Coupling Mechanism | High-strength hardened alloy steel internal spline through-drive coupling shaft connecting front and rear gear rotors |
| Port Configuration Options | Standard European 4-bolt diamond flanged ports (M6/M8) on both stages; BSPP cylindrical threaded ports optional; common inlet port optional |
| Rotation Direction | Clockwise (D / Right-Hand) standard; Counter-Clockwise (S / Left-Hand) available upon request |
| Hydraulic Fluid Compatibility | Mineral-oil-based hydraulic fluids (HL / HLP to ISO 6743/4; DIN 51524 Class 1 and 2); optimal viscosity 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) |
| Fluid Cleanliness Standard | ISO 4406 Class 20/18/15 (NAS 1638 Class 8~9) with return line filtration β25 ≥ 75 |
| Assembly Tightening Torques | Flange mounting bolts: 45 ± 3 Nm; Body tie-rod clamp bolts: 60 ± 4 Nm |
| Individual Stage Performance & Parameter Ratings (Group 2PDF)
| Stage Model Code | Displacement (cm³/rev) | Operating Pressure (bar / psi) | Rotational Speed (r/min) | Theor. Flow @ 1500 rpm (L/min) | |||
|---|---|---|---|---|---|---|---|
| P1 (Continuous) | P2 (Intermittent) | P3 (Peak) | Max. Speed | Min. Speed | |||
| 2PDF04 | 4.00 | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 4000 | 700 | 6.00 |
| 2PDF06 | 6.00 | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 4000 | 700 | 9.00 |
| 2PDF08 | 8.50 | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 3800 | 700 | 12.75 |
| 2PDF11 | 11.00 | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 3800 | 600 | 16.50 |
| 2PDF14 | 14.00 | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 3500 | 600 | 21.00 |
| 2PDF16 | 16.50 | 230 / 3,335 | 255 / 3,698 | 280 / 4,060 | 3500 | 600 | 24.75 |
| 2PDF19 | 19.50 | 210 / 3,045 | 235 / 3,408 | 260 / 3,770 | 3200 | 500 | 29.25 |
| 2PDF22 | 22.50 | 200 / 2,900 | 225 / 3,263 | 250 / 3,625 | 3000 | 500 | 33.75 |
| 2PDF26 | 26.00 | 180 / 2,610 | 205 / 2,973 | 230 / 3,335 | 3000 | 500 | 39.00 |
| 2PDF30 | 30.00 | 170 / 2,465 | 190 / 2,755 | 210 / 3,045 | 2800 | 500 | 45.00 |
| Tandem Combination Principles & Mechanical Drive Guidelines
| Engineering Factor | Design Specification & Application Recommendation |
|---|---|
| Displacement Hierarchy Rule | For optimal shaft torsional loading and mechanical balance, the stage with the larger displacement should be placed in the front position (P1) and the equal or smaller displacement in the rear position (P2): V1 ≥ V2. |
| Total Drive Shaft Input Torque | The primary front drive shaft absorbs the cumulative torque demanded by both stages: T_total = T1 (front) + T2 (rear) ≤ T_max allowable (European 1:8 taper shaft: max continuous torque 140 Nm). |
| Intermediate Spline Torque Capacity | The internal intermediate spline through-drive shaft transmits torque exclusively to the rear pump: T2 (rear) ≤ 100 Nm continuous. |
| Inlet Configuration Versatility | Available with separate independent suction inlets (ideal for isolated circuits or dual tanks) or a unified single common suction inlet in the intermediate body to simplify suction manifold piping. |
| Integrated Control Valves | Rear cover or intermediate adapter can be integrated with direct-acting pressure relief valves (RV) or priority flow control valves (FAx / Fx). |
| 1:1 Direct-Fit OEM Brand Replacement Coverage
| Manufacturer Brand | Direct-Fit Drop-In Tandem Equivalent Series |
|---|---|
| CASAPPA | POLARIS 20 Dual Series (PLP20+PLP20 / PL20+PL20 modular tandem gear pumps) |
| Bosch Rexroth | AZPF-1X + AZPF-1X Group 2 multiple gear pumps (European 4-bolt standard) |
| MARZOCCHI | 2P + 2P / ALP2 + ALP2 / GHP2 + GHP2 modular tandem external gear pumps |
| PARKER Hannifin | PGP511 + PGP511 / PGP517 + PGP517 multiple section external gear pumps |
| DANFOSS / Turolla | SNP2NN + SNP2NN Group 2 dual external gear pumps |
| VIVOLO (Vivoil) | XV-2P + XV-2P multiple section external gear pumps |
| SALAMI | 2PB + 2PB / 2PE + 2PE dual gear pump combinations |
| BUCHER Hydraulics | AP212 + AP212 multiple external gear pumps |
| Individual Stage Performance & Parameter Ratings (Group 2PDF)
| Stage Model Code | Displacement (cm³/rev) | Operating Pressure (bar / psi) | Rotational Speed (r/min) | Theor. Flow @ 1500 rpm (L/min) | |||
|---|---|---|---|---|---|---|---|
| P1 (Continuous) | P2 (Intermittent) | P3 (Peak) | Max. Speed | Min. Speed | |||
| 2PDF04 | 4.00 | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 4000 | 700 | 6.00 |
| 2PDF06 | 6.00 | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 4000 | 700 | 9.00 |
| 2PDF08 | 8.50 | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 3800 | 700 | 12.75 |
| 2PDF11 | 11.00 | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 3800 | 600 | 16.50 |
| 2PDF14 | 14.00 | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 3500 | 600 | 21.00 |
| 2PDF16 | 16.50 | 230 / 3,335 | 255 / 3,698 | 280 / 4,060 | 3500 | 600 | 24.75 |
| 2PDF19 | 19.50 | 210 / 3,045 | 235 / 3,408 | 260 / 3,770 | 3200 | 500 | 29.25 |
| 2PDF22 | 22.50 | 200 / 2,900 | 225 / 3,263 | 250 / 3,625 | 3000 | 500 | 33.75 |
| 2PDF26 | 26.00 | 180 / 2,610 | 205 / 2,973 | 230 / 3,335 | 3000 | 500 | 39.00 |
| 2PDF30 | 30.00 | 170 / 2,465 | 190 / 2,755 | 210 / 3,045 | 2800 | 500 | 45.00 |
| Manufacturer Brand | Direct-Fit Drop-In Tandem Equivalent Series |
|---|---|
| CASAPPA | POLARIS 20 Dual Series (PLP20+PLP20 / PL20+PL20 modular tandem gear pumps) |
| Bosch Rexroth | AZPF-1X + AZPF-1X Group 2 multiple gear pumps (European 4-bolt standard) |
| MARZOCCHI | 2P + 2P / ALP2 + ALP2 / GHP2 + GHP2 modular tandem external gear pumps |
| PARKER Hannifin | PGP511 + PGP511 / PGP517 + PGP517 multiple section external gear pumps |
| DANFOSS / Turolla | SNP2NN + SNP2NN Group 2 dual external gear pumps |
| VIVOLO (Vivoil) | XV-2P + XV-2P multiple section external gear pumps |
| SALAMI | 2PB + 2PB / 2PE + 2PE dual gear pump combinations |
| BUCHER Hydraulics | AP212 + AP212 multiple external gear pumps |
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