Gear pump
Tandem Hydraulic Gear Pump 2PD2F+2PDF European Diamond Flange Series
Engineered with high-tensile extruded aluminum alloy gear housings and a compact European standard 2-bolt diamond mounting flange, the HENGYUHANG 2PD2F+2PDF dual Group 2 tandem hydraulic gear pump delivers dual-circuit fluid power with peak working pressures up to 300 bar (4,350 psi) and high volumetric efficiency exceeding 94%.
| Applications
Designed for European and international agricultural tractors, compact mobile construction equipment, and multi-function industrial hydraulic power packs, this dual Group 2 tandem pump independently supplies primary implement and auxiliary steering/cooling circuits. Its compact European 2-bolt diamond (rhomboid) mounting pattern enables seamless installation in narrow engine compartments, bell housings, and tight machine chassis where space is strictly constrained.
| Key Technical Specifications
Product Model: Hengyuhang Tandem Hydraulic Gear Pump 2PD2F+2PDF European Diamond Flange Series
Brand Replacement: CASAPPA, Rexroth, Marzocchi, Parker OEM or as requested.
Displacement: Front Stage (Group 2PD2F): 4.0 to 30.0 cm³/rev; Rear Stage (Group 2PDF): 4.0 to 30.0 cm³/rev
Rotation Direction: Clockwise (D), counter-clockwise (S), reversible (upon request)
Speed Range: Min. speed 500 r/min; Max. speed 4000 r/min
Peak Pressure: Up to 300 bar (4,350 psi / 30.0 MPa)
- Description
- Tecspecs
- Brand & Reference
- Download Tandem 2PD2F Hydraulic Gear Pump PDF
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| Overview of HENGYUHANG 2PD2F+2PDF European Diamond Flange Series
The HENGYUHANG 2PD2F+2PDF European Diamond Flange Series is a high-performance dual Group 2 tandem external gear pump engineered for compact mobile and industrial hydraulic systems requiring two independent delivery circuits. Constructed with high-strength extruded aviation-grade aluminum alloy central gear bodies and heavy-duty front diamond mounting flanges and intermediate coupling brackets, this tandem assembly delivers outstanding fatigue resistance, pressure containment up to 250 bar continuous, and peak pressure resilience reaching 300 bar (4,350 psi). The front 2PD2F stage incorporates an induction-hardened internal splined through-drive shaft that smoothly drives the rear 2PDF stage without parasitic radial deflection. Featuring a standardized European 2-bolt diamond flange (Centring pilot Ø 36.5 mm with 96.0 mm bolt center pitch or Ø 50.8 mm with 106.0 mm pitch) and precision 1:8 European taper drive shafts, this series offers 1:1 OEM drop-in interchangeability across 27+ international manufacturers.
| Dimension of HENGYUHANG 2PD2F+2PDF European Diamond Flange Series
| Interface Data Needed with the Drawing (Dimensional Reference Table)
| Interface Parameter | Engineering Specification & Dimensional Standard | Notes / Tolerance |
|---|---|---|
| Front Mounting Flange | European standard 2-bolt diamond (rhomboid) flange | Standard Code E2 (pilot Ø 36.5 mm, 96.0 mm pitch) or Code D2 (pilot Ø 50.8 mm, 106.0 mm pitch) |
| Flange Centring Pilot | Ø 36.5 mm (1.437 in) / Ø 50.8 mm (2.000 in) | Pilot tolerance h8 (-0.010 / -0.049 mm), pilot projection depth 5.0 mm |
| 2-Bolt Mounting Pattern | 96.0 mm (3.780 in) / 106.0 mm (4.173 in) diagonal center distance | Precision 2-bolt diamond ear holes |
| Mounting Bolt Holes | 2 × Ø 9.0 mm / Ø 11.0 mm through clearance holes | Suitable for M8 / M10 high-tensile grade 8.8 / 10.9 mounting bolts |
| Primary Drive Shaft | European 1:8 taper shaft with woodruff key (Catalogue Code T1) | M12 × 1.25 threaded end with hex nut, 3.0 mm or 3.2 mm woodruff key |
| Alternative Drive Shafts | Cylindrical keyed shaft (Ø 19.05 mm, Code C1) / Involute spline (DIN 5482 B17x14, Code S1) | Available upon customer installation requirements |
| Intermediate Through-Drive | Dedicated high-torque internal splined coupling (Group 2 to Group 2) | High-strength alloy steel connecting front and rear drive gears |
| Front Stage Ports (2PD2F) | European 4-bolt diamond flange (M6/M8) or BSPP cylindrical thread | Separate inlet and outlet ports or shared common suction configuration |
| Rear Stage Ports (2PDF) | European 4-bolt diamond flange (M6/M8) or BSPP cylindrical thread | Standard European 40.0 × 40.0 mm / 30.0 × 30.0 mm or 35.0 × 35.0 mm port patterns |
| Housing Construction | High-tensile extruded aluminum alloy gear housings | Front diamond flange, intermediate bracket, and rear cover in cast iron or aluminum |
| Seals Material | Standard: NBR Buna-N (-20 °C to +85 °C); Optional: FKM Viton (-15 °C to +110 °C) | Anti-extrusion backup rings for continuous high-pressure operation |
| Flange Fastening Torque | 70 ± 5 N·m (620 ÷ 664 lbf·in) | Fastened evenly to bell-housing / mounting plate |
| Pump Installation Specifications HENGYUHANG 2PD2F+2PDF European Diamond Flange Series
| Comprehensive Ordering Code Breakdown (Hengyuhang 2PDF Tandem Series Structure)
Code structure — reference: 2PD2F+2PDF−D1/D2−R−C−S−P1/P2−M−B
| Code Position | Meaning & Available Values |
|---|---|
| 2PD2F+2PDF | Series designation (Group 2 Dual Stage Tandem Hydraulic Gear Pump) |
| D1 (Front Stage Displacement) | Selected from Group 2 ratings: 04, 06, 08, 11, 14, 16, 19, 22, 26, 30 cm³/rev |
| D2 (Rear Stage Displacement) | Selected from Group 2 ratings: 04, 06, 08, 11, 14, 16, 19, 22, 26, 30 cm³/rev |
| R (Rotation Direction) | D = Clockwise (viewed from shaft end); S = Anti-Clockwise; R = Reversible / Bi-directional |
| C (Front Mounting Flange) | E2 = European 2-bolt diamond flange (Pilot Ø 36.5 mm, 96.0 mm pitch); D2 = Italian/German diamond flange (Pilot Ø 50.8 mm, 106.0 mm pitch) |
| S (Drive Shaft Code) | T1 = European 1:8 taper shaft with M12×1.25 nut; C1 = Ø 19.05 mm cylindrical keyed shaft; S1 = DIN 5482 B17x14 spline |
| P1/P2 (Inlet/Outlet Port Dimensions) | F2 = European 4-bolt diamond flange; G2 = BSPP threaded ports; U2 = SAE straight thread O-ring boss |
| M (Seals Compound) | N = NBR Buna-N (standard); V = Viton FKM |
| B (Outboard Bearing Option) | 0 = Standard direct coupling; 1 = With heavy-duty front radial/axial bearing |
| Reading Your Replacement Code
| Code Segment | Example Value | Meaning & Configuration |
|---|---|---|
| Series & Stage Model | 2PD2F+2PDF.14/08 | Dual Group 2 Tandem: Front (14.0 cm³/rev) + Rear (8.5 cm³/rev) |
| Rotation | D | Clockwise rotation when facing drive shaft extension |
| Mounting Flange | E2 | European standard 2-bolt diamond flange (Pilot Ø 36.5 mm, 96.0 mm bolt pitch) |
| Drive Shaft | T1 | European standard 1:8 tapered shaft with woodruff key and M12×1.25 nut |
| Port Dimensions | F2 / F2 | Front stage European 4-bolt diamond flanged ports / Rear stage European flanged ports |
| Seal Compound | N | Nitrile butadiene rubber (NBR) oil seals with PTFE backup rings |
| Design Revision | A | Standard direct factory production series |
| Techspecs of HENGYUHANG 2PD2F+2PDF European Diamond Flange Series
| Performance Data Across Displacements
Note: Reference catalogue performance ratings based on ISO VG 46 mineral oil, T = 50 °C, ν = 30 mm²/s.
Dual Group 2 Stages (2PD2F / 2PDF)
| Model Code | Displacement (cm³/rev) | Flow @ 1500 rpm (l/min) | Continuous Pressure p1 (bar) | Intermittent Pressure p2 (bar) | Peak Pressure p3 (bar) | Max Speed (r/min) | Min Speed (r/min) |
|---|---|---|---|---|---|---|---|
| 2PD-04 | 4.00 | 6.0 | 250 | 275 | 300 | 4,000 | 700 |
| 2PD-06 | 6.00 | 9.0 | 250 | 275 | 300 | 4,000 | 700 |
| 2PD-08 | 8.50 | 12.8 | 250 | 275 | 300 | 3,800 | 700 |
| 2PD-11 | 11.00 | 16.5 | 250 | 275 | 300 | 3,800 | 600 |
| 2PD-14 | 14.00 | 21.0 | 250 | 275 | 300 | 3,500 | 600 |
| 2PD-16 | 16.50 | 24.8 | 230 | 255 | 280 | 3,500 | 600 |
| 2PD-19 | 19.50 | 29.3 | 210 | 235 | 260 | 3,200 | 500 |
| 2PD-22 | 22.50 | 33.8 | 200 | 225 | 250 | 3,000 | 500 |
| 2PD-26 | 26.00 | 39.0 | 180 | 205 | 230 | 3,000 | 500 |
| 2PD-30 | 30.00 | 45.0 | 170 | 190 | 210 | 2,800 | 500 |
Note: Technical values represent nominal catalogue reference ratings applicable to both the front 2PD2F and rear 2PDF pump stages. Combined multi-stage flow can reach up to 90 l/min. Maximum continuous operating parameters are governed by cumulative input drive shaft torque ratings and operating temperature.
| Operating Conditions & Fluid Compatibility
| Parameter | Permissible Operating Range | Recommended Optimal Target |
|---|---|---|
| Working Fluid | Mineral oil-based hydraulic fluids (HL / HLP to DIN 51524) | High-quality anti-wear hydraulic oil |
| Operating Viscosity | 12 to 100 mm²/s (cSt) | 20 to 80 mm²/s (cSt) |
| Max. Cold Start Viscosity | Up to 1000 mm²/s (p < 10 bar, n < 1500 r/min) | Pre-warm oil before applying heavy system loads |
| Fluid Temperature (NBR) | -20 °C to +85 °C (-4 °F to +185 °F) | +30 °C to +60 °C (+86 °F to +140 °F) |
| Fluid Temperature (FKM) | -15 °C to +110 °C (+5 °F to +230 °F) | Extreme temperature / synthetic fluid duties |
| Inlet Absolute Pressure | 0.7 to 3.0 bar absolute (10 to 44 psi) | Recommended 0.9 to 1.1 bar at pump suction |
| Fluid Cleanliness Class | ISO 4406 Class 20/18/15 (NAS 1638 Class 9) | Class 19/17/14 (NAS 8) for extended service life |
Advantages
Compact European 2-Bolt Diamond Flange Design
The diamond (rhomboid) 2-bolt mounting pattern minimizes lateral envelope width, enabling easy installation into tight mobile engine bays, compact tractor bell housings, and narrow industrial power pack frames.
Dual Independent Delivery Circuits
Combines two Group 2 gear sets into a single compact unit driven by one prime mover, independently powering primary working hydraulics and auxiliary steering/cooling systems without cross-circuit interaction.
High Continuous Pressure Resilience
High-tensile extruded aviation aluminum bodies paired with heavy-duty cast iron or aluminum end covers prevent housing dilation under continuous working pressures up to 250 bar and peak pressures reaching 300 bar (4,350 psi).
Reliable Internal Splined Through-Drive
Incorporates an induction-hardened alloy steel through-shaft splined coupling engineered to transmit the full downstream drive torque with high torsional rigidity and zero internal binding.
High Volumetric Efficiency (>94%)
Hydrostatically balanced floating thrust plates automatically compensate for thermal expansion and face wear, sustaining peak volumetric efficiency and minimizing internal slip across thousands of operating hours.
Low Noise & Vibration
Precision-shaved, case-hardened alloy steel gear profiles minimize trapped fluid pulsation, ensuring exceptionally smooth and quiet operation in compact machinery operator environments.
Reference
Series Architecture & Displacements
Series Nomenclature: HENGYUHANG Tandem Hydraulic Gear Pump 2PD2F+2PDF European Diamond Flange Series
Front Stage (Group 2PD2F): Displacements from 4.0 to 30.0 cm³/rev (10 standard displacement steps).
Rear Stage (Group 2PDF): Displacements from 4.0 to 30.0 cm³/rev (10 standard displacement steps).
Flange Standard: European Standard 2-Bolt Diamond Flange (Code E2, Pilot Ø36.5 mm, 96.0 mm pitch; or Code D2, Pilot Ø50.8 mm).
Drive Shaft: European 1:8 taper shaft with woodruff key and M12×1.25 nut (Code T1), or optional cylindrical keyed / splined shafts.
Intermediate Coupling: Dedicated internal involute splined through-drive coupling.
Comprehensive Interchangeability & Replacement Matrix
The HENGYUHANG 2PD2F+2PDF European Diamond Flange series provides 1:1 drop-in replacement compatibility across the following 27 international hydraulic pump manufacturers and designated series:
MARZOCCHI: GHP2A, ALP2A, GHP2, ALP2, 1PD series
DANFOSS: SNP1NN, SNP2NN, SNW2NN series
HYDAC: PGE102, PGE104 series
ARGO-HYTOS: GP2, GP3, GP1 series
ATOS: PFG series
Brevini (Dana Brevini): OT100, OT200, OT300 series
BUCHER Hydraulics: AP100, AP200, AP212, AP300 series
BONDIOLI & PAVESI: HPLPA1, HPLPA2, HPLPA3 series
Boden: BAP1, BHP1, BAP2, BHP2, BHP3, BAP3 series
Caproni: 10A, 20A, 30A, 10C, 20C, 30C series
CASAPPA: PLP10, PLP20, PLP30 series
CONCENTRIC: WP300, WP900, WP1500 series
DUPLOMATIC: 1P, GP2, GP3, GP1 series
Galtech: 1SPA, 2SPA, 3GPG, 3SPA series
GRH: 1PF, 2PF, 3PF series
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
JIHOSTROJ: P23, J, T3, Q2, UD series
PARKER (Commercial Hydraulics / Parker): PGP505, PGP502, PGP511, PGP517 series
Bosch Rexroth: AZPB, AZPF, AZPG, AZPN series
RONZIO: 01ZAG, 01ZBG, 02ZAG, 02ZCG, 02ZLG series
ROQUET: 1L0, PLA, GZ, G, GLA, PLC series
SDH: CBD series
VIVOLO (Vivoil): X1P, XV-1P, X2P, X3P, XV-2P, XV-3P series
Brand Replacement
The HENGYUHANG 2PD2F+2PDF European Diamond Flange series is precision-engineered as a direct 1:1 drop-in replacement for premier European and global hydraulic gear pump lines, notably CASAPPA Polaris PLP20, Bosch Rexroth AZPF, MARZOCCHI ALP2/GHP2, and PARKER PGP511. Every tandem pump undergoes 100% factory dynamic testing across its full speed and pressure curve to guarantee volumetric efficiency, mechanical output, and dual-circuit pressure isolation up to 300 bar. Utilizing standard European diamond flange spigot dimensions (Ø36.5 mm pilot, 96.0 mm pitch) and standardized 1:8 tapered drive shafts, Hengyuhang pumps allow equipment manufacturers and service engineers to perform direct drop-in field replacements without piping rework, bracket redesign, or system modifications. Custom displacement pairings, shared or separate suction ports, and specialized shaft extensions are fully supported with rapid turnaround.
Applications
Agricultural Tractors & Implements: Main three-point hitch lifting circuit and auxiliary steering or hydraulic motor drive circuits on compact, vineyard, and utility tractors.
Compact Construction Equipment: Primary boom lift and auxiliary steering/cooling fan circuits on mini excavators, compact track loaders, and trenchers.
Material Handling & Forklifts: Mast elevation and auxiliary hydraulic power steering circuits for electric and diesel counterbalance forklifts and warehouse stackers.
Municipal & Turf Care Machinery: Compact road sweepers, commercial lawn mowers, refuse collectors, and hydraulic salt spreaders.
Industrial Hydraulic Power Packs (HPUs): Dual-pressure hydraulic clamping systems, machine tool lubrication/cooling circuits, and scissor lift hydraulic tables.
Package & Shipping
| Packaging Type | Heavy-duty export corrugated carton with custom molded shock-absorbing foam inserts; sea-freight orders packed in fumigation-free wooden cases |
|---|---|
| Port Protection | Heavy-duty threaded plastic port plugs and shaft sleeve protectors installed |
| Corrosion Prevention | External rust-preventive oil coating and vapor-corrosion inhibitor (VCI) polybag wrapping |
| Selling Unit | Single item (MOQ = 1 piece for standard models) |
| Package Dimensions | Approx. 380 mm × 220 mm × 200 mm (varies with displacement pairing) |
| Gross Weight | Approx. 8.5 – 13.5 kg (depending on displacement configuration) |
| Standard Lead Time | 3 – 5 business days for stocked components; 15 – 25 business days for volume OEM production |
| Shipping Methods | Global express air freight (DHL / FedEx / UPS / TNT) for urgent maintenance; Sea freight / Air cargo for wholesale orders |
| OEM & Customization | Private label laser marking, customer part numbering, and custom displacement combinations supported |
Why Choose Hengyuhang?
Direct Factory Precision Manufacturing & CNC Excellence: Manufactured in our state-of-the-art production facility equipped with high-precision 4-axis and 5-axis CNC machining centers, automated gear hobbing, and CNC gear tooth profile grinding (Ra < 0.2 μm) to ensure superior surface finish, ultra-tight internal clearances, and maximum volumetric efficiency.
100% Full-Cycle Multi-Parameter Factory Inspection: Every single pump undergoes computerized testing before packaging, verifying flow rate at rated speed, volumetric efficiency (>94%), mechanical efficiency, continuous and peak pressure hold, internal bypass, and noise spectrum. Zero untested units leave the factory.
Seamless 1:1 OEM Drop-In Interchangeability: Dimensionally matched to European, SAE, and DIN standards, providing 1:1 direct mechanical interchangeability across 27+ international brands (Casappa, Rexroth, Marzocchi, Parker, Danfoss, Jihostroj, etc.) with zero mounting modifications required.
Flexible Engineering Customization & Rapid Prototyping: Supported by a senior fluid power engineering team, offering custom displacement combinations, specialized shaft tapers, splines, integrated priority or relief valves, and non-standard port orientations with rapid sample prototyping and low MOQ requirements.
Robust Supply Chain, Extensive Inventory & Fast Global Dispatch: Extensive raw material stock of high-grade extruded aluminum alloy bodies, precision gear sets, and bearing assemblies enables rapid assembly and 48–72 hour dispatch for emergency breakdown replacements, supported by complete export logistics.
12-Month Comprehensive Warranty & Lifetime Technical Support: All pumps are backed by a comprehensive 12-month manufacturer warranty against defects in materials and workmanship, supplemented by 24/7 engineering consultation, CAD drawing verification, and lifecycle technical assistance.
Tandem Hydraulic Gear Pump Group 2PD2F+2PDF European Diamond Flange Series (4.00~30.00 + 4.00~30.00 cm³/rev) is a high-performance, compact dual-stage external gear pump engineered for European-specification mobile machinery, agricultural equipment, and industrial hydraulic power packs requiring independent dual-circuit fluid delivery. Featuring an industry-standard European diamond 2-bolt mounting flange (centering spigot pilot Ø50.0 mm with tolerance -0.025/-0.050 mm, pilot depth 5.5 mm, and diamond 2-bolt pattern with 60.0 × 86.0 mm rectangular coordinate spacing / 105.0 mm diagonal bolt centers with 2 × Ø10.5 mm clearance holes, flange code K0/K1), this dual-section tandem pump couples a primary Group 2 front pump (2PD2F) with a secondary Group 2 rear pump (2PDF) via an internal through-drive spline coupling shaft. Constructed with high-strength extruded aluminum alloy gear housings combined with heavy-duty cast aluminum/iron front and intermediate connection flanges, the 2PD2F+2PDF series provides exceptional power-to-weight ratio, rapid thermal dissipation, and high pressure capability with continuous operating pressures (p1) up to 250 bar (3,625 psi) and maximum peak pressures (p3) reaching 300 bar (4,350 psi). Offering 10 standardized displacement sizes across both stages ranging from 4.00 to 30.00 cm³/rev, the combined displacement spans 8.00 up to 60.00 cm³/rev (delivering up to 90.00 L/min combined flow @ 1500 rpm). Equipped with case-hardened alloy steel precision gears, high-load DU composite journal bushings, and hydrostatically balanced floating wear plates across both stages, the pump maintains volumetric efficiencies exceeding 94% under demanding continuous-duty operations.
| Applications
The 2PD2F+2PDF European diamond flange tandem hydraulic gear pump series is specifically designed for European mobile hydraulic systems, agricultural machinery, and industrial power packs requiring efficient dual-circuit pressure delivery:
-
Agricultural Compact Tractors and Vineyard Equipment: Direct-mounts to European engine PTO or auxiliary drive gearboxes; the primary 2PD2F stage supplies high-efficiency power to front-end loader lift cylinders and three-point hitch systems, while the secondary 2PDF stage provides dedicated oil flow to hydrostatic power steering and auxiliary hydraulic remotes.
-
Mini Excavators, Compact Wheel Loaders, and Skid Steers: Compact diamond 2-bolt flange fits restricted engine compartments; the front pump stage feeds boom, arm, and bucket working circuits, while the rear pump stage powers auxiliary hydraulic attachments, cooling fans, and pilot control valves without mutual pressure drop.
-
European Forklifts, Warehouse Stackers, and Material Handling Units: Direct-driven via electric motor or diesel engine power units; the primary stage operates main mast lifting cylinders, while the secondary stage supplies hydraulic power for priority steering and fork carriage side-shift cylinders.
-
Municipal Compact Sweepers and Waste Management Vehicles: Supplies continuous dual-circuit flow; the front stage drives hydraulic rotary sweeping brush motors and gutter brooms, while the rear stage operates hopper tipping, debris door opening, and water spray pump circuits.
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Industrial Hydraulic Power Units and Machine Tool Systems: Configured as an energy-saving high-low dual pump system; both stages deliver combined high flow during rapid cylinder advance, after which the secondary stage unloads to tank and the primary stage sustains high clamping or holding pressures up to 250 bar with minimal energy dissipation.
-
Mobile Elevating Work Platforms and Aerial Boom Lifts: Delivers smooth, proportional multi-function hydraulic power; the front pump feeds platform elevation and telescoping boom extension, while the rear pump handles platform leveling and continuous turret rotation drives.
| Key Specifications Overview
| Parameter | Specification |
|---|---|
| Series Architecture | Compact Dual-Stage External Hydraulic Gear Pump (Group 2 Front 2PD2F + Group 2 Rear 2PDF) |
| Front Stage Displacement (2PD2F) | 4.00 ~ 30.00 cm³/rev (10 standardized 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 (2PDF) | 4.00 ~ 30.00 cm³/rev (10 standardized 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 | 8.00 ~ 60.00 cm³/rev (modular dual-circuit pairing: V1 + V2) |
| Continuous Operating Pressure (p1) | 170 ~ 250 bar (2,465 ~ 3,625 psi) depending on displacement rating across both stages |
| Intermittent Operating Pressure (p2) | 190 ~ 275 bar (2,755 ~ 3,988 psi) |
| Max. Peak Pressure (p3) | 210 ~ 300 bar (3,045 ~ 4,350 psi) |
| Rotational Speed Range | Minimum speed: 500 ~ 700 min⁻¹; Maximum rated speed: 2800 ~ 4000 min⁻¹ |
| Volumetric Efficiency | ≥ 94% under rated continuous operating pressure and recommended fluid viscosity |
| Hydro-Mechanical Efficiency | ≥ 88% ~ 91% |
| Body and Housing Construction | High-tensile extruded aluminum alloy gear bodies with heavy-duty cast aluminum/iron front diamond mounting flange, intermediate through-drive adapter, and rear cover |
| Mounting Flange Standard | European diamond 2-bolt flange (centering spigot pilot Ø50.0 -0.025/-0.050 mm, pilot depth 5.5 mm, 60.0 × 86.0 mm rectangular bolt coordinates / 105.0 mm diagonal bolt spacing with 2 × Ø10.5 mm holes, flange code K0/K1) |
| Primary Drive Shaft Specification | Standard: European 1:5 Taper shaft (taper ratio 1:5, nominal diameter Ø17.0 mm, thread M12×1.5, with 3.0 mm woodruff key, max allowable drive torque 155 Nm); Optional: European 1:8 Taper shaft (M12×1.25, 3.165 mm key, code T1, 140 Nm), Ø18 mm straight keyed (code H1), or DIN 5482 splined shaft |
| Intermediate Through-Drive Coupling | Hardened high-tensile alloy steel internal spline coupling shaft connecting Group 2 front and rear stages (max allowable intermediate torque: 110 Nm) |
| Hydraulic Port Connections | Standard European 4-bolt diamond flanged ports (4 × M6 threads on outlet, 4 × M8 threads on inlet) or optional BSPP cylindrical parallel threaded ports (G 1/2, G 3/4) |
| Rotation Direction | Clockwise (D / Right-Hand) standard; Counter-Clockwise (S / Left-Hand) available upon request (viewed facing drive shaft) |
| Hydraulic Fluid Compatibility | Mineral-oil-based hydraulic fluids (HL / HLP to ISO 6743/4; DIN 51524 Part 1 and 2); optimal viscosity range: 20 ~ 80 mm²/s (cSt) |
| Operating Temperature Range | -20°C to +80°C (standard NBR seals); -15°C to +100°C (optional Viton FKM seals) |
| Assembly Tightening Torques | Diamond flange mounting bolts: 45 ± 5 Nm; Tie-rod assembly bolts: 50 ± 5 Nm |
| Technical Performance Matrix Across Available Stages
| Stage Model Code | Stage Material |
Displacement cm³/rev (in³/rev) |
Operating Pressure (bar / psi) | Speed Range (min⁻¹) |
Flow @ 1500 rpm (L/min) |
Input Power @ 200 bar (kW) |
|||
|---|---|---|---|---|---|---|---|---|---|
| Continuous (p1) | Intermittent (p2) | Peak (p3) | Min. Speed | Max. Speed | |||||
| Front Primary Stage (Group 2PD2F Series — European Diamond Flange) | |||||||||
| 2PD2F4 | Aluminum Alloy | 4.00 (0.244) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 700 | 4000 | 6.00 | 2.3 |
| 2PD2F6 | Aluminum Alloy | 6.00 (0.366) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 700 | 4000 | 9.00 | 3.4 |
| 2PD2F8 | Aluminum Alloy | 8.50 (0.518) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 700 | 3800 | 12.75 | 4.8 |
| 2PD2F11 | Aluminum Alloy | 11.00 (0.671) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 600 | 3800 | 16.50 | 6.2 |
| 2PD2F14 | Aluminum Alloy | 14.00 (0.854) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 600 | 3500 | 21.00 | 7.9 |
| 2PD2F16 | Aluminum Alloy | 16.50 (1.006) | 230 / 3,335 | 255 / 3,698 | 280 / 4,060 | 600 | 3500 | 24.75 | 9.3 |
| 2PD2F19 | Aluminum Alloy | 19.50 (1.189) | 210 / 3,045 | 235 / 3,408 | 260 / 3,770 | 500 | 3200 | 29.25 | 11.0 |
| 2PD2F22 | Aluminum Alloy | 22.50 (1.372) | 200 / 2,900 | 225 / 3,263 | 250 / 3,625 | 500 | 3000 | 33.75 | 12.7 |
| 2PD2F26 | Aluminum Alloy | 26.00 (1.586) | 180 / 2,610 | 205 / 2,973 | 230 / 3,335 | 500 | 3000 | 39.00 | 14.7 |
| 2PD2F30 | Aluminum Alloy | 30.00 (1.830) | 170 / 2,465 | 190 / 2,755 | 210 / 3,045 | 500 | 2800 | 45.00 | 16.9 |
| Rear Secondary Stage (Group 2PDF Series) | |||||||||
| 2PDF4 | Aluminum Alloy | 4.00 (0.244) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 700 | 4000 | 6.00 | 2.3 |
| 2PDF6 | Aluminum Alloy | 6.00 (0.366) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 700 | 4000 | 9.00 | 3.4 |
| 2PDF8 | Aluminum Alloy | 8.50 (0.518) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 700 | 3800 | 12.75 | 4.8 |
| 2PDF11 | Aluminum Alloy | 11.00 (0.671) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 600 | 3800 | 16.50 | 6.2 |
| 2PDF14 | Aluminum Alloy | 14.00 (0.854) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 600 | 3500 | 21.00 | 7.9 |
| 2PDF16 | Aluminum Alloy | 16.50 (1.006) | 230 / 3,335 | 255 / 3,698 | 280 / 4,060 | 600 | 3500 | 24.75 | 9.3 |
| 2PDF19 | Aluminum Alloy | 19.50 (1.189) | 210 / 3,045 | 235 / 3,408 | 260 / 3,770 | 500 | 3200 | 29.25 | 11.0 |
| 2PDF22 | Aluminum Alloy | 22.50 (1.372) | 200 / 2,900 | 225 / 3,263 | 250 / 3,625 | 500 | 3000 | 33.75 | 12.7 |
| 2PDF26 | Aluminum Alloy | 26.00 (1.586) | 180 / 2,610 | 205 / 2,973 | 230 / 3,335 | 500 | 3000 | 39.00 | 14.7 |
| 2PDF30 | Aluminum Alloy | 30.00 (1.830) | 170 / 2,465 | 190 / 2,755 | 210 / 3,045 | 500 | 2800 | 45.00 | 16.9 |
| Mechanical Drive Guidelines and Torque Limitations
| Mechanical Parameter | Engineering Specification and Limit |
|---|---|
| Primary Shaft Drive Torque Limit (T1_max) | European 1:5 Taper Shaft (M12×1.5, 3 mm key): 155 Nm (1,372 lbf in); European 1:8 Taper Shaft (code T1, M12×1.25, 3.165 mm key): 140 Nm (1,239 lbf in); Ø18 mm Straight Keyed Shaft: 130 Nm |
| Intermediate Coupling Torque Limit (T2_max) | 110 Nm (973 lbf in) max torque transfer capacity for through-drive internal spline coupling connecting Group 2 front and rear stages |
| Cumulative Drive Torque Verification Formula | T_total = (V1 × p1) / (20 × π × η_hm) + (V2 × p2) / (20 × π × η_hm) ≤ T1_max |
| Secondary Stage Torque Verification Formula | T_rear = (V2 × p2) / (20 × π × η_hm) ≤ 110 Nm (safely protects through-drive intermediate internal spline coupling) |
| Stage Sizing and Sequencing Engineering Rule | Always ensure primary front stage displacement is equal to or greater than secondary rear stage displacement (V1 ≥ V2) to optimize driveline stress distribution |
| European Diamond Mounting Flange, Shaft and Port Details
| Interface Feature | Technical Standard and Dimension |
|---|---|
| Mounting Flange Standard | European diamond 2-bolt flange (centering spigot pilot Ø50.0 -0.025/-0.050 mm, pilot depth 5.5 mm, flange code K0/K1) |
| Mounting Hole Pattern Dimensions | 60.0 × 86.0 mm rectangular coordinate spacing / 105.0 mm diagonal bolt center-to-center distance with 2 × Ø10.5 mm clearance bolt holes |
| Primary Drive Shaft (Standard) | European 1:5 Taper shaft (nominal Ø17.0 mm, thread M12×1.5, with 3.0 mm woodruff key, max allowable drive torque 155 Nm) |
| Primary Drive Shaft (Optional) | European 1:8 Taper shaft (nominal Ø17.46 mm, thread M12×1.25, 3.165 mm key, code T1, 140 Nm); Ø18.0 mm straight keyed shaft (6.0 mm key, code H1); or DIN 5482 involute spline |
| Intermediate Coupling Mechanism | High-strength alloy steel internal spline through-drive coupling connecting Group 2 front and rear stages (allowable intermediate torque limit: 110 Nm) |
| Front Stage Port Connections (2PD2F) | Standard European 4-bolt diamond flanged ports (Inlet: 4 × M8 threads; Outlet: 4 × M6 threads) or optional BSPP cylindrical parallel threaded ports (G 1/2, G 3/4) |
| Rear Stage Port Connections (2PDF) | Standard European 4-bolt diamond flanged ports (Inlet: 4 × M8 threads; Outlet: 4 × M6 threads) or optional BSPP cylindrical parallel threaded ports (G 1/2, G 3/4) |
| Standard Interchangeability and Mounting Compliance
| Standardization Category | Technical Compliance and Interchangeability Characteristics |
|---|---|
| Mounting Interface Standard | Conforms fully to European standard diamond 2-bolt mounting specifications (centering pilot Ø50.0 mm, 60 × 86 mm / 105 mm diagonal bolt spacing), providing universal physical interchangeability on European tractors, compact wheel loaders, and mini excavators. |
| Drive Shaft Standardization | Standard 1:5 and 1:8 taper shafts conform to ISO/DIN European mobile machinery standards, enabling direct mechanical coupling to standard European diesel engine timing-case PTO drives and electric motor bellhousings. |
| Hydraulic Port Compatibility | Porting options include standard European 4-bolt flanged ports (M6/M8) and BSPP cylindrical threads conforming to ISO 228-1, providing complete plumbing compatibility with international standard hydraulic piping lines. |
| OEM Tandem Replacement | Functions as a direct drop-in replacement for standard European Group 2 + Group 2 dual gear pumps operating on agricultural tractors, vineyard equipment, compact earthmovers, and industrial hydraulic power units. |
| Technical Performance Matrix Across Available Stages
| Stage Model Code | Stage Material | Displacement cm³/rev (in³/rev) | Operating Pressure (bar / psi) | Speed Range (min⁻¹) | Flow @ 1500 rpm (L/min) | Input Power @ 200 bar (kW) | |||
|---|---|---|---|---|---|---|---|---|---|
| Continuous (p1) | Intermittent (p2) | Peak (p3) | Min. Speed | Max. Speed | |||||
| Front Primary Stage (Group 2PD2F Series — European Diamond Flange) | |||||||||
| 2PD2F4 | Aluminum Alloy | 4.00 (0.244) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 700 | 4000 | 6.00 | 2.3 |
| 2PD2F6 | Aluminum Alloy | 6.00 (0.366) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 700 | 4000 | 9.00 | 3.4 |
| 2PD2F8 | Aluminum Alloy | 8.50 (0.518) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 700 | 3800 | 12.75 | 4.8 |
| 2PD2F11 | Aluminum Alloy | 11.00 (0.671) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 600 | 3800 | 16.50 | 6.2 |
| 2PD2F14 | Aluminum Alloy | 14.00 (0.854) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 600 | 3500 | 21.00 | 7.9 |
| 2PD2F16 | Aluminum Alloy | 16.50 (1.006) | 230 / 3,335 | 255 / 3,698 | 280 / 4,060 | 600 | 3500 | 24.75 | 9.3 |
| 2PD2F19 | Aluminum Alloy | 19.50 (1.189) | 210 / 3,045 | 235 / 3,408 | 260 / 3,770 | 500 | 3200 | 29.25 | 11.0 |
| 2PD2F22 | Aluminum Alloy | 22.50 (1.372) | 200 / 2,900 | 225 / 3,263 | 250 / 3,625 | 500 | 3000 | 33.75 | 12.7 |
| 2PD2F26 | Aluminum Alloy | 26.00 (1.586) | 180 / 2,610 | 205 / 2,973 | 230 / 3,335 | 500 | 3000 | 39.00 | 14.7 |
| 2PD2F30 | Aluminum Alloy | 30.00 (1.830) | 170 / 2,465 | 190 / 2,755 | 210 / 3,045 | 500 | 2800 | 45.00 | 16.9 |
| Rear Secondary Stage (Group 2PDF Series) | |||||||||
| 2PDF4 | Aluminum Alloy | 4.00 (0.244) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 700 | 4000 | 6.00 | 2.3 |
| 2PDF6 | Aluminum Alloy | 6.00 (0.366) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 700 | 4000 | 9.00 | 3.4 |
| 2PDF8 | Aluminum Alloy | 8.50 (0.518) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 700 | 3800 | 12.75 | 4.8 |
| 2PDF11 | Aluminum Alloy | 11.00 (0.671) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 600 | 3800 | 16.50 | 6.2 |
| 2PDF14 | Aluminum Alloy | 14.00 (0.854) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 600 | 3500 | 21.00 | 7.9 |
| 2PDF16 | Aluminum Alloy | 16.50 (1.006) | 230 / 3,335 | 255 / 3,698 | 280 / 4,060 | 600 | 3500 | 24.75 | 9.3 |
| 2PDF19 | Aluminum Alloy | 19.50 (1.189) | 210 / 3,045 | 235 / 3,408 | 260 / 3,770 | 500 | 3200 | 29.25 | 11.0 |
| 2PDF22 | Aluminum Alloy | 22.50 (1.372) | 200 / 2,900 | 225 / 3,263 | 250 / 3,625 | 500 | 3000 | 33.75 | 12.7 |
| 2PDF26 | Aluminum Alloy | 26.00 (1.586) | 180 / 2,610 | 205 / 2,973 | 230 / 3,335 | 500 | 3000 | 39.00 | 14.7 |
| 2PDF30 | Aluminum Alloy | 30.00 (1.830) | 170 / 2,465 | 190 / 2,755 | 210 / 3,045 | 500 | 2800 | 45.00 | 16.9 |
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