Gear pump
Tandem Hydraulic Gear Pump 2PD2F+2PDF SAE A 2 Bolt
Hengyuhang Tandem Hydraulic Gear Pump 2PD2F+2PDF SAE A 2-Bolt Series is a high-pressure dual-stage external gear pump coupling two Group 2 sections with an SAE A 2-bolt mount to deliver synchronized or independent fluid power up to 300 bar.
| Applications of Hengyuhang Tandem Hydraulic Gear Pump 2PD2F+2PDF SAE A 2-Bolt Series
This tandem external gear pump series is designed for North American and international mobile machinery and industrial equipment requiring dual high-pressure circuits powered from a single SAE A drive interface. Common applications include compact wheel loaders, mini and midi excavators, skid steer attachments, agricultural tractors, utility bucket trucks, aerial work platforms, road rollers, street sweepers, and industrial multi-circuit hydraulic power packs where space conservation and dual-circuit reliability are essential.
| Key Technical Specifications
Product Model: Hengyuhang Tandem Hydraulic Gear Pump 2PD2F+2PDF SAE A 2-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 2PD2F+2PDF SAE A 2-Bolt Series
The HENGYUHANG 2PD2F+2PDF SAE A 2-Bolt Series combines two robust Group 2 (2PDF) hydraulic external gear pump sections driven through a heavy-duty internal splined through-shaft and hardened coupling sleeve. Featuring an internationally standardized SAE "A" 2-bolt oval mounting flange (pilot Ø 82.55 mm / 3.25 in), this double pump configuration enables machinery designers and operators to supply two independent hydraulic circuits or combine flows for high-speed cylinder operation without the expense, weight, and space requirements of auxiliary split gearboxes or dual prime movers.
Both primary (P1) and secondary (P2) pump sections are engineered with high-strength extruded aluminum alloy housings, high-grade cast iron front mounting flanges, and heavy-duty intermediate adapter covers. Floating hydrostatic pressure-balanced thrust plates automatically compensate for thermal expansion and pressure variations, maintaining volumetric efficiencies above 94% across demanding duty cycles. Each stage is configurable across 10 displacement sizes from 4.0 to 30.0 cm³/rev, delivering continuous working 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 series provides 100% 1:1 drop-in replacement across 27 global hydraulic manufacturers.
| Dimension of HENGYUHANG Tandem Hydraulic Gear Pump 2PD2F+2PDF SAE A 2-Bolt Series
Interface data needed with the drawing:
| Item | Value |
|---|---|
| Primary mounting flange | Standard SAE "A" 2-bolt oval mounting flange (pilot Ø 82.55 -0.05 mm / 3.25 in with 106.4 mm / 4.187 in bolt centers, 2-Ø 11.0 mm or 2-Ø 13.5 mm mounting clearance holes). |
| Primary drive shaft options | 1. SAE "A" 9-tooth involute splined shaft (16/32 DP, flat root side fit) / 2. SAE "A" 11-tooth involute splined shaft (16/32 DP) / 3. Cylindrical keyed shaft: Ø 15.87 mm (5/8 in) or Ø 19.05 mm (3/4 in) with precision square key / 4. European 1:8 tapered shaft with woodruff key (M12×1.5 nut) |
| Intermediate through-drive coupling | Heavy-duty 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. SAE straight thread O-ring boss ports (UNF/UN threads to SAE J1926) / 2. SAE 4-bolt split flange ports (Code 61) / 3. BSPP parallel threaded ports (G 1/2, G 3/4, G 1) / 4. European standard diamond 4-bolt flanged ports (M6/M8) |
| 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 2PD2F+2PDF SAE A 2-Bolt Series
The HENGYUHANG 2PD2F+2PDF SAE A 2-Bolt Series utilizes a standardized modular ordering code structure:
Code structure — reference: 2PD2F+2PDF — Tandem Hydraulic External Gear Pump SAE A 2-Bolt Series
| Segment | Meaning | Standard Options & Features |
|---|---|---|
| Series | 2PD2F+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 | S1 / S2 / C1 / T1 | S1: SAE 9T spline; S2: SAE 11T spline; C1: Cylindrical keyed shaft; T1: 1:8 taper shaft |
| Mounting Flange | A2 | A2: SAE "A" 2-bolt oval flange (pilot Ø 82.55 mm, 106.4 mm centers) |
| Suction Config | S / C | S: Separate inlets for P1 and P2; C: Common suction port for shared reservoir line |
| Ports | U / F / B | U: SAE O-ring boss ports; F: 4-bolt flanged ports; B: BSPP threaded 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 2PD2F+2PDF Series | 100% 1:1 drop-in replacement; identical Group 2 SAE A 2-bolt front flange, shaft splines, port centers, and tandem body length |
| DANFOSS SNP1NN, SNP2NN, SNW2NN Series | HENGYUHANG 2PD2F+2PDF Series | Direct form, fit, and functional replacement; matching displacement combinations and continuous 250 bar pressure ratings |
| HYDAC PGE102, PGE104 Series | HENGYUHANG 2PD2F+2PDF Series | Fully interchangeable mounting pilot, bolt circles, shaft splines, and intermediate through-drive coupling |
| ARGO-HYTOS GP1, GP2, GP3 Series | HENGYUHANG 2PD2F+2PDF Series | Exact match across nominal displacements, flange patterns, and pressure capabilities |
| ATOS PFG Series | HENGYUHANG 2PD2F+2PDF Series | Plug-and-play installation; matching SAE A flange and drive shaft options |
| Brevini OT100, OT200, OT300 Series | HENGYUHANG 2PD2F+2PDF Series | Direct replacement for multi-function mobile auxiliary and work hydraulic systems |
| BUCHER AP100, AP200, AP212, AP300 Series | HENGYUHANG 2PD2F+2PDF Series | High volumetric efficiency, low noise output, and identical mechanical port centerlines |
| BONDIOLI & PAVESI HPLPA1, HPLPA2, HPLPA3 Series | HENGYUHANG 2PD2F+2PDF Series | Direct agricultural and industrial tractor drop-in tandem replacement |
| Boden BAP1, BHP1, BAP2, BHP2, BAP3, BHP3 Series | HENGYUHANG 2PD2F+2PDF Series | Exact displacement matching, port dimensions, and continuous 250 bar pressure ratings |
| Caproni 10A, 20A, 30A, 10C, 20C, 30C Series | HENGYUHANG 2PD2F+2PDF Series | Full mechanical interchangeability; matching shaft keys, flange pilots, and body lengths |
| CASAPPA PLP10, PLP20, PLP30 (Polaris) Series | HENGYUHANG 2PD2F+2PDF Series | 100% drop-in tandem replacement for PLP20/20 double pump configurations |
| CONCENTRIC WP300, WP900, WP1500 Series | HENGYUHANG 2PD2F+2PDF Series | Equivalent flow delivery, mounting dimensions, and high-speed operation up to 3500 rpm |
| DUPLOMATIC 1P, GP1, GP2, GP3 Series | HENGYUHANG 2PD2F+2PDF Series | Direct industrial power unit and machine tool tandem replacement |
| Galtech 1SPA, 2SPA, 3GPG, 3SPA Series | HENGYUHANG 2PD2F+2PDF Series | Exact match on mounting flange, shaft tapers, and flanged port pitch |
| GRH 1PF, 2PF, 3PF Series | HENGYUHANG 2PD2F+2PDF Series | Direct drop-in match across all Group 2 + Group 2 displacement combinations |
| HANSA-TMP 1SP, 2SP, 3GPG, 3SPA Series | HENGYUHANG 2PD2F+2PDF Series | 100% interchangeable fluid power parameters and compact axial body length |
| HESPER HA11, HA2, HA3, CHP1 Series | HENGYUHANG 2PD2F+2PDF Series | Direct replacement for mobile work circuits and steering priority systems |
| HONOR 1KH Series | HENGYUHANG 2PD2F+2PDF Series | Drop-in dimensional envelope and identical hydraulic port positions |
| HPI P1BAN1, P1BAN2, P1AAN2, P1BAN3, P1AAN3 Series | HENGYUHANG 2PD2F+2PDF Series | Exact replacement for French/European mobile machinery standards |
| HYDRONIT E Series | HENGYUHANG 2PD2F+2PDF Series | Perfect fit for dual-function electro-hydraulic power packs and compact work circuits |
| JIHOSTROJ P23, J, T3, Q2, UD Series | HENGYUHANG 2PD2F+2PDF Series | Exact drop-in replacement for Czech/Central European machinery |
| PARKER PGP505, PGP502, PGP511, PGP517 Series | HENGYUHANG 2PD2F+2PDF Series | Direct replacement for Parker Group 2 + Group 2 tandem gear pumps |
| Rexroth AZPB, AZPF, AZPG, AZPN Series | HENGYUHANG 2PD2F+2PDF Series | 100% compatible drop-in replacement for Rexroth double gear pumps |
| RONZIO 01ZAG, 01ZBG, 02ZAG, 02ZCG, 02ZLG Series | HENGYUHANG 2PD2F+2PDF Series | Exact match on aluminum body geometry, flange pilots, and shaft splines |
| ROQUET 1L0, PLA, GZ, G, GLA, PLC Series | HENGYUHANG 2PD2F+2PDF Series | Direct drop-in replacement for Spanish and international agricultural equipment |
| SDH CBD Series | HENGYUHANG 2PD2F+2PDF Series | Equivalent pressure levels, displacement sizes, and mounting dimensions |
| VIVOLO X1P, XV-1P, X2P, X3P, XV-2P, XV-3P Series | HENGYUHANG 2PD2F+2PDF Series | Direct replacement for Vivoil Group 2 + Group 2 single and tandem external gear pumps |
Techspecs — HENGYUHANG 2PD2F+2PDF SAE A 2-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 2PD2F+2PDF SAE A assembly, Stage 1 (P1) and Stage 2 (P2) can feature identical displacements (e.g., 2PD2F-11+2PDF-11, 2PD2F-16.5+2PDF-16.5) or differential displacements (e.g., 2PD2F-26+2PDF-8.5, 2PD2F-22.5+2PDF-11.0). 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 2PD2F+2PDF SAE A 2-Bolt Series
North American & Global Standard Mounting
Standardized SAE "A" 2-bolt oval flange (pilot Ø 82.55 mm) integrates directly onto engine bell housings, PTO drives, and electric motor adapters without requiring intermediate mounting plates.
High Dual-Flow Capacity (Up to 30+30 cm³/rev)
Supplies substantial hydraulic flow to two independent work circuits (up to 90 l/min total at 1500 rpm or 180 l/min at 3000 rpm) from a single drive shaft.
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 international dimensional envelopes, providing 100% 1:1 plug-and-play replacement for MARZOCCHI, DANFOSS, Rexroth, PARKER, and 23 other international manufacturers.
Reference — HENGYUHANG 2PD2F+2PDF SAE A 2-Bolt Series
Series Architecture
The HENGYUHANG 2PDF+2PDF SAE A 2-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: 2PD2F-8.5+2PDF-8.5, 2PD2F-11+2PDF-11, 2PD2F-14+2PDF-8.5, 2PD2F-14+2PDF-14, 2PD2F-19.5+2PDF-11, 2PD2F-22.5+2PDF-14, 2PD2F-26+2PDF-16.5, 2PD2F-30+2PDF-14
Target Brand Interchangeability Matrix
The HENGYUHANG 2PDF+2PDF SAE A 2-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 2PD2F+2PDF SAE A 2-Bolt Series conforming strictly to standard SAE J744 2-bolt mounting specifications. 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 2PD2F+2PDF SAE A 2-Bolt Series
Mobile Construction & Utility Machinery: Dual high-flow circuits powering boom lift cylinders, auxiliary attachments, and steering systems on compact wheel loaders and utility vehicles.
Agricultural Equipment & Tractors: Dedicated circuits for front loader implement controls and rear three-point hitch/hydraulic remote valves.
Aerial Work Platforms & Boom Lifts: Independent flow for drive traction circuits and platform elevation/leveling mechanisms.
Sweepers & Municipal Vehicles: Powers auxiliary hydraulic motor drives for rotary brooms and steering/hopper dump functions.
Industrial Multi-Circuit Hydraulic Power Packs: Provides primary circuit flow and secondary cooling/filtration or clamping circuit actuation.
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 2PD2F+2PDF SAE A 2-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 power two independent hydraulic circuits or provide combined two-stage high-low fluid delivery from a single prime mover. Built with an SAE J744 SAE A 2-bolt oval mounting flange (Ø82.55 mm centering pilot, 106.4 mm bolt center distance), this multi-section unit pairs two Group 2PDF pump bodies through an internal high-torque spline intermediate through-drive coupling shaft. It allows independent displacement selection across 10 standard displacements from 4.0 to 30.0 cm³/rev for both front and rear stages, providing a combined total displacement envelope from 8.0 up to 60.0 cm³/rev. Engineered with high-strength extruded aircraft-grade aluminium alloy housings, case-hardened micro-finished alloy steel gear sets, and hydrostatic axial pressure-balanced composite DU bushings, the 2PDF+2PDF SAE A tandem pump operates at continuous working pressures up to 250 bar (3,625 psi) and peak pressures up to 300 bar (4,350 psi) on small-to-medium displacements, and up to 170~230 bar on larger sizes. Offering cylindrical keyed (Ø15.88 mm / Ø19.05 mm) or SAE involute splined drive shafts, SAE UNF O-ring boss or flanged porting, and independent or common suction configurations, this series achieves over 94% volumetric efficiency and serves as a direct 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 2PD2F+2PDF SAE A 2-bolt tandem hydraulic gear pump series is specifically engineered for multi-function North American and international mobile machinery and industrial power units requiring high continuous pressure across dual independent circuits, including medium-to-large agricultural tractors (front-end loader attachments plus rear 3-point hitch and hydraulic steering), counterbalance forklifts and rough-terrain reach trucks (main mast hoist elevation plus auxiliary carriage side-shift/clamping), mini and compact wheel loaders, compact excavators, dual-speed high-low hydraulic presses (rapid low-pressure cylinder advance and high-pressure holding), refuse compactor trucks, hook loaders, telehandlers, and industrial manufacturing hydraulic power units (HPUs) driving dual automated actuator circuits from a single electric or diesel engine.
| Key Specifications Overview
| Parameter | Specification |
|---|---|
| Series Architecture | Modular Dual-Stage External Hydraulic Gear Pump (Group 2PD2F 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 | SAE J744 SAE A 2-bolt oval flange (Ø82.55 mm / 3.250 in pilot, 106.4 mm / 4.189 in bolt center spacing, 2 × through-holes) |
| Drive Shaft Options | Cylindrical straight keyed shaft (Ø15.88 mm / 5/8" or Ø19.05 mm / 3/4" with 4.76 mm key) or SAE 9T / 11T involute spline |
| Intermediate Coupling Mechanism | Heavy-duty hardened alloy steel internal spline through-drive coupling shaft connecting front and rear gear rotors |
| Port Configuration Options | SAE straight thread O-ring boss (UNF threads: 7/8-14UNF, 1-1/16-12UN; G 1/2, G 3/4 BSPP) or European 4-bolt diamond flanged ports; common inlet 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 |
| 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 (Ø19.05 mm straight keyed shaft: max continuous torque 110 Nm; SAE spline shaft: max continuous torque 150 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 hydraulic oil reservoirs) or a unified single common suction inlet in the intermediate body to simplify external 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). |
| SAE A 2-Bolt Flange & Drive Shaft Details
| Interface Feature | Technical Standard & Dimension |
|---|---|
| Flange Standard | SAE J744 SAE A 2-bolt oval mounting flange |
| Centering Pilot Diameter | Ø82.55 mm (3.250 in) precision pilot diameter with 6.35 mm spigot depth |
| Bolt Hole Pitch & Pattern | 106.4 mm (4.189 in) center-to-center spacing with 2 × through-holes for 3/8" (M10) mounting bolts |
| Primary Keyed Shaft Options | Ø15.88 mm (5/8 in) or Ø19.05 mm (3/4 in) cylindrical shaft with 4.76 mm (3/16 in) square drive key |
| Primary Splined Shaft Options | SAE J498b 9-tooth (9T 16/32 DP, 30° pressure angle) or 11-tooth (11T 16/32 DP) involute spline |
| Port Standard Options | SAE straight thread O-ring boss (UNF threads: 7/8-14UNF inlet, 3/4-16UNF outlet / 1-1/16-12UN inlet, 7/8-14UNF outlet) or European flanged ports |
| 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 with SAE A 2-bolt flange) |
| Bosch Rexroth | AZPF-1X + AZPF-1X Group 2 multiple gear pumps (SAE A 2-bolt oval mounting) |
| MARZOCCHI | 2P + 2P / ALP2 + ALP2 / GHP2 + GHP2 SAE A 2-bolt modular tandem pumps |
| PARKER Hannifin | PGP511 + PGP511 / PGP517 + PGP517 SAE A multiple external gear pumps |
| DANFOSS / Turolla | SNP2NN + SNP2NN Group 2 dual external gear pumps (SAE A mounting) |
| VIVOLO (Vivoil) | XV-2P + XV-2P multiple section external gear pumps (SAE A flange) |
| SALAMI | 2PB + 2PB / 2PE + 2PE dual gear pumps with SAE A 2-bolt pilot |
| BUCHER Hydraulics | AP212 + AP212 multiple external gear pumps (SAE A flange) |
| 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 | |||
| 2PD2F04 | 4.00 | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 4000 | 700 | 6.00 |
| 2PD2F06 | 6.00 | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 4000 | 700 | 9.00 |
| 2PD2F08 | 8.50 | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 3800 | 700 | 12.75 |
| 2PD2F11 | 11.00 | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 3800 | 600 | 16.50 |
| 2PD2F14 | 14.00 | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 3500 | 600 | 21.00 |
| 2PD2F16 | 16.50 | 230 / 3,335 | 255 / 3,698 | 280 / 4,060 | 3500 | 600 | 24.75 |
| 2PD2F19 | 19.50 | 210 / 3,045 | 235 / 3,408 | 260 / 3,770 | 3200 | 500 | 29.25 |
| 2PD2F22 | 22.50 | 200 / 2,900 | 225 / 3,263 | 250 / 3,625 | 3000 | 500 | 33.75 |
| 2PD2F26 | 26.00 | 180 / 2,610 | 205 / 2,973 | 230 / 3,335 | 3000 | 500 | 39.00 |
| 2PD2F30 | 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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