Gear pump
Tandem Cast Iron Hydraulic Gear Pump 2PT2F+2PDF 4 Bolt Rectangular
Hengyuhang Tandem Cast Iron Hydraulic Gear Pump 2PT2F+2PDF 4-Bolt Rectangular Series pairs a heavy-duty cast iron front stage with a precision Group 2 secondary stage in a European standard 4-bolt rectangular mount, delivering exceptional pressure fatigue resistance, continuous multi-circuit flow, and peak pressure capability up to 350 bar.
| Applications of Hengyuhang Tandem Cast Iron Hydraulic Gear Pump 2PT2F+2PDF 4-Bolt Rectangular Series
Engineered for demanding European mobile equipment and industrial hydraulic systems, this heavy-duty tandem pump drives high-pressure primary work circuits alongside secondary steering, fan drive, or pilot valve circuits from a single engine drive pad. It provides rugged, continuous fluid power for compact wheel loaders, mini-excavators, agricultural sprayers, skid steers, aerial work platforms, and industrial hydraulic power packs operating under severe pressure pulsation cycles.
| Key Technical Specifications
Product Model: Hengyuhang Tandem Cast Iron Hydraulic Gear Pump 2PT2F+2PDF 4-Bolt Rectangular Series
Brand Replacement: CASAPPA, Rexroth, Marzocchi, Parker OEM or as requested.
Displacement: Front Stage (Group 2PT2F Cast Iron): 4 to 33 cm³/rev; Rear Stage (Group 2PDF): 4 to 30 cm³/rev
Rotation Direction: Clockwise (D), counter-clockwise (S), reversible (R)
Speed Range: Min. speed 500 to 700 r/min; Max. speed 3000 to 4000 r/min
Peak Pressure: Up to 350 bar (5,076 psi)
| Overview of HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 2PT2F+2PDF 4-Bolt Rectangular Series
The HENGYUHANG 2PT2F+2PDF 4-Bolt Rectangular Series delivers an engineered hybrid-architecture dual-circuit fluid power solution designed to European mounting standards. It couples a heavy-duty spheroidal graphite ductile cast-iron front pump stage (2PT2F) with a precision Group 2 rear pump stage (2PDF). Driven synchronously through an internal induction-hardened splined through-drive intermediate coupling, this assembly eliminates the need for secondary auxiliary drive gearboxes, twin electric motors, or complex hydraulic flow divider networks, while providing two entirely separate fluid circuits with independent operating pressures and flows.
Featuring an industry-standard European Group 2 4-bolt rectangular mounting flange (centring pilot Ø 36.5 mm / 1.437 inches, rectangular bolt hole pattern 96.0 mm × 71.5 mm), the 2PT2F+2PDF series provides direct 1:1 drop-in interchangeability with OEM tandem gear pumps across 27 leading international hydraulic manufacturers, including CASAPPA (KP20 / PHP20 / Polaris series), Bosch Rexroth, MARZOCCHI, PARKER, and DANFOSS. The cast iron front stage (2PT2F) covers displacements from 4.0 to 33.0 cm³/rev, handling severe-duty cyclic work circuits such as boom lift, bucket tilt, high-pressure clamping, or hydraulic motor drive at continuous working pressures up to 300 bar (4,350 psi) and peak pressures up to 350 bar (5,076 psi). The rear Group 2 section (2PDF) covers displacements from 4.0 to 30.0 cm³/rev, independently serving auxiliary hydrostatic power steering, thermostatic fan drive loops, pilot joystick controllers, or brake cooling loops at pressures up to 250 bar.
The front pump body and mounting flange are precision-cast from high-tensile spheroidal graphite ductile iron, delivering outstanding structural stiffness, vibration damping, and resistance to cavitation erosion and pressure barrel dilation under extreme cyclic pressure shocks. The rear section utilizes high-tensile extruded aluminum alloy construction. Case-hardened, precision-ground alloy steel gears ride within heavy-duty composite DU/PTFE hydrodynamic sleeve bushings. Independently floating hydrostatic axial thrust balance plates continuously equalize running clearances across variable thermal and viscosity gradients, maintaining volumetric efficiencies exceeding 94% while suppressing pressure ripple and acoustic emissions throughout rigorous operational lifespans.
| Dimension of HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 2PT2F+2PDF 4-Bolt Rectangular Series
Interface data needed with the drawing:
| Item | Value |
|---|---|
| Front mounting flange | European standard Group 2 4-bolt rectangular flange (centring pilot Ø 36.5 mm / 1.437" h8, bolt hole center spacing 96.0 mm × 71.5 mm / 3.78" × 2.81", clearance holes Ø 9.0 mm for M8 hardware) |
| Primary drive shaft | Standard European 1:8 tapered shaft (T1) with M12 × 1.25 threaded end, slotted nut, and 3.2 mm or 4.0 mm woodruff key / Optional cylindrical keyed shaft Ø 19.05 mm (3/4") / Involute splined shaft (DIN 5482 B17×14) |
| Intermediate drive coupling | Induction-hardened internal involute splined sleeve coupling transferring driving torque from the 2PT2F front through-shaft to the 2PDF rear drive gear journal, rated for full combined drive torque |
| Rotation direction | Clockwise (D) or Counter-clockwise (S), viewed from drive shaft end (Bi-directional reversible rotation available upon special engineering order) |
| Inlet port routing | Independent separate suction ports (standard: individual 2PT2F and 2PDF suction ports) / Common merged suction port located on intermediate body (optional for consolidated tank line piping) |
| Front stage ports (2PT2F Cast Iron) | European 4-bolt diamond flange (standard) / BSPP threaded ports / Metric straight thread ports / SAE straight thread O-ring boss (UN/UNF) |
| Rear stage ports (2PDF) | European 4-bolt diamond flange (standard) / BSPP cylindrical threaded ports / SAE straight thread O-ring boss (UN/UNF) |
| Seal materials | Standard NBR Buna-N elastomeric seals (-20 °C to +85 °C / -4 °F to +185 °F); Optional Viton (FKM) fluorocarbon seals for high-temperature synthetic fluid applications (-15 °C to +110 °C / +5 °F to +230 °F) |
| Body construction | High-tensile spheroidal graphite ductile cast iron front body and European 4-bolt flange; high-tensile extruded aluminum alloy rear body and ductile cast-iron or aluminum rear end-plate |
| Flange mounting bolt torque | 30 ± 3 Nm (22 ÷ 24 lbf ft) for M8 Grade 8.8 mounting bolts |
| Tie-rod clamp bolt torque | Front 2PT2F section: 65 ± 5 Nm; Rear 2PDF section: 60 ± 4 Nm |
| Pump Installation Specifications HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 2PT2F+2PDF 4-Bolt Rectangular Series
The HENGYUHANG 2PT2F+2PDF European rectangular flange tandem cast iron series utilizes an unambiguous modular model numbering system:
Code structure — reference: 2PT2F+2PDF-E4B — Cast Iron Front Group 2 + Group 2 European 4-Bolt Rectangular Tandem Gear Pump Series
| Segment | Meaning | Standard Options & Features |
|---|---|---|
| Series Code | 2PT2F+2PDF | Modular tandem gear pump: Group 2PT2F cast iron front stage + Group 2PDF rear stage |
| Front Displacement | 04 to 33 | Group 2PT2F cast iron displacement in cm³/rev (4.0, 6.0, 8.5, 11.0, 14.0, 16.5, 19.5, 22.5, 26.0, 30.0, 33.0) |
| Rear Displacement | 04 to 30 | Group 2PDF rear displacement in cm³/rev (4.0, 6.0, 8.5, 11.0, 14.0, 16.5, 19.5, 22.5, 26.0, 30.0) |
| Rotation | D / S / R | D: Clockwise; S: Counter-clockwise; R: Reversible bi-directional |
| Drive Shaft | T1 / C19 / SP | T1: European 1:8 taper shaft with M12 × 1.25 nut; C19: Ø 19.05 mm cylindrical keyed shaft; SP: Involute splined shaft |
| Mounting Flange | E4B | European standard Group 2 4-bolt rectangular flange (pilot Ø 36.5 mm, 96.0 × 71.5 mm bolt pattern) |
| Inlet Routing | S / C | S: Separate dual suction ports (independent circuits); C: Common single merged suction inlet |
| Port Types | EF / G / UN / SF | EF: European diamond flange; G: BSPP thread; UN: SAE O-ring boss; SF: SAE split flange |
| Seals | N / V | N: Buna-N (NBR) standard; V: Viton (FKM) high-temperature / synthetic fluid seals |
| Auxiliary Options | RV / FD / ST | RV: Integrated pressure relief valve; FD: Priority flow divider valve; ST: Customized OEM specification |
| Reading your replacement code
| Your Target Brand & Model | HENGYUHANG 2PT2F+2PDF Equivalent | Interchange Verification Notes |
|---|---|---|
| CASAPPA KP20 / PHP20 + PLP20 (Euro 4-Bolt) | HENGYUHANG 2PT2F+2PDF Series | 100% direct drop-in; identical pilot Ø 36.5 mm, 96 × 71.5 mm bolt pattern, 1:8 taper shaft, cast iron front body |
| Bosch Rexroth AZPF + AZPF Tandem (Euro) | HENGYUHANG 2PT2F+2PDF Series | Seamless mechanical envelope, shaft taper fit, and enhanced cast iron front pressure performance |
| MARZOCCHI GHP2 + ALP2 Tandem (Euro 4-Bolt) | HENGYUHANG 2PT2F+2PDF Series | Exact match on European rectangular flange spigot, port drilling centers, and through-drive torque ratings |
| PARKER PGP511 + PGP505 / PGP511 Tandem | HENGYUHANG 2PT2F+2PDF Series | Complete bolt-hole, shaft taper, and high-pressure hydraulic replacement for mobile construction machinery |
| DANFOSS SNP2NN + SNP2NN / SNP1NN Tandem | HENGYUHANG 2PT2F+2PDF Series | Direct drop-in fit for multi-function agricultural machinery, compact loaders, and boom lifts |
| BUCHER Hydraulics AP200 + AP200 / AP100 Tandem | HENGYUHANG 2PT2F+2PDF Series | Direct drop-in fit for industrial power packs, drilling rigs, and compact material handling equipment |
| Galtech 2SPA + 2SPA / 1SPA Tandem (Euro Mount) | HENGYUHANG 2PT2F+2PDF Series | Identical mounting pilot, through-shaft torque distribution, and port centerline dimensions |
| VIVOLO (Vivoil) X2P + X2P / XV-2P + XV-1P Tandem | HENGYUHANG 2PT2F+2PDF Series | Fully interchangeable on European 4-bolt rectangular mounting flange, drive shaft, and hydraulic flow characteristics |
| Techspecs of HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 2PT2F+2PDF 4-Bolt Rectangular Series
| Performance Data Across Displacements
Front Stage — Group 2PT2F (Cast Iron Heavy-Duty Through-Drive)
| Model Code | Displacement (cm³/rev) | Displacement (in³/rev) | Continuous Pressure p1 (bar / psi) | Intermittent Pressure p2 (bar / psi) | Peak Pressure p3 (bar / psi) | Min. Speed (r/min) | Max. Speed (r/min) | Flow at 1500 r/min (l/min) |
|---|---|---|---|---|---|---|---|---|
| 2PT2F-04 | 4.0 | 0.244 | 280 / 4,060 | 310 / 4,495 | 350 / 5,076 | 700 | 4,000 | 6.00 |
| 2PT2F-06 | 6.0 | 0.366 | 280 / 4,060 | 310 / 4,495 | 350 / 5,076 | 700 | 4,000 | 9.00 |
| 2PT2F-08 | 8.5 | 0.518 | 280 / 4,060 | 310 / 4,495 | 350 / 5,076 | 700 | 3,800 | 12.75 |
| 2PT2F-11 | 11.0 | 0.671 | 280 / 4,060 | 310 / 4,495 | 350 / 5,076 | 600 | 3,800 | 16.50 |
| 2PT2F-14 | 14.0 | 0.854 | 280 / 4,060 | 310 / 4,495 | 350 / 5,076 | 600 | 3,500 | 21.00 |
| 2PT2F-16 | 16.5 | 1.006 | 260 / 3,770 | 290 / 4,205 | 320 / 4,640 | 600 | 3,500 | 24.75 |
| 2PT2F-19 | 19.5 | 1.189 | 240 / 3,480 | 270 / 3,915 | 300 / 4,350 | 500 | 3,200 | 29.25 |
| 2PT2F-22 | 22.5 | 1.372 | 220 / 3,190 | 250 / 3,625 | 280 / 4,060 | 500 | 3,000 | 33.75 |
| 2PT2F-26 | 26.0 | 1.586 | 200 / 2,900 | 230 / 3,335 | 260 / 3,770 | 500 | 3,000 | 39.00 |
| 2PT2F-30 | 30.0 | 1.830 | 180 / 2,610 | 210 / 3,045 | 240 / 3,480 | 500 | 2,800 | 45.00 |
| 2PT2F-33 | 33.0 | 2.013 | 170 / 2,465 | 200 / 2,900 | 230 / 3,335 | 500 | 2,600 | 49.50 |
Rear Stage — Group 2PDF (Standard Group 2)
| Model Code | Displacement (cm³/rev) | Displacement (in³/rev) | Continuous Pressure p1 (bar / psi) | Intermittent Pressure p2 (bar / psi) | Peak Pressure p3 (bar / psi) | Min. Speed (r/min) | Max. Speed (r/min) | Flow at 1500 r/min (l/min) |
|---|---|---|---|---|---|---|---|---|
| 2PDF-04 | 4.0 | 0.244 | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 700 | 4,000 | 6.00 |
| 2PDF-06 | 6.0 | 0.366 | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 700 | 4,000 | 9.00 |
| 2PDF-08 | 8.5 | 0.518 | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 700 | 3,800 | 12.75 |
| 2PDF-11 | 11.0 | 0.671 | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 600 | 3,800 | 16.50 |
| 2PDF-14 | 14.0 | 0.854 | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 600 | 3,500 | 21.00 |
| 2PDF-16 | 16.5 | 1.006 | 230 / 3,335 | 255 / 3,698 | 280 / 4,060 | 600 | 3,500 | 24.75 |
| 2PDF-19 | 19.5 | 1.189 | 210 / 3,045 | 235 / 3,408 | 260 / 3,770 | 500 | 3,200 | 29.25 |
| 2PDF-22 | 22.5 | 1.372 | 200 / 2,900 | 225 / 3,263 | 250 / 3,625 | 500 | 3,000 | 33.75 |
| 2PDF-26 | 26.0 | 1.586 | 180 / 2,610 | 205 / 2,973 | 230 / 3,335 | 500 | 3,000 | 39.00 |
| 2PDF-30 | 30.0 | 1.830 | 170 / 2,465 | 190 / 2,755 | 210 / 3,045 | 500 | 2,800 | 45.00 |
Note: Operating speed of the complete tandem assembly is governed by the lower maximum speed limit of the two selected pump displacements.
| Operating Conditions & Fluid Compatibility
| Operating Parameter | Specification | Recommendation & Limits |
|---|---|---|
| Hydraulic fluid type | Mineral oil-based hydraulic fluids | HL or HLP hydraulic oils to ISO 6743/4; DIN 51524 Part 1 and 2 |
| Operating viscosity range | 12 to 100 mm²/s (cSt) | Optimum performance viscosity range: 20 to 80 mm²/s (cSt) |
| Cold start viscosity limit | Up to 1,000 mm²/s (cSt) | Permissible during low-speed, low-pressure machine warm-up cycles |
| Fluid operating temperature | -20 °C to +85 °C (-4 °F to +185 °F) | Standard NBR Buna-N seals; Viton (FKM) required for +85 °C to +110 °C |
| Inlet suction line pressure | 0.7 to 3.0 bar absolute (10 to 44 psia) | Minimum 0.7 bar abs. at full working speed to prevent inlet cavitation |
| Fluid cleanliness rating | ISO 4406 Class 20/18/15 | Recommended circuit filtration: β25 ≥ 75 on return or suction filtration loop |
| Drive torque transmission | Involute through-drive intermediate shaft | Input shaft maximum torque must satisfy: Ttotal = Tfront + Trear ≤ Tshaft_limit |
Advantages — HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 2PT2F+2PDF 4-Bolt Rectangular Series
Cast Iron Fatigue Durability & Extreme Pressure Resistance
The front 2PT2F pump body and mounting flange are manufactured from high-grade spheroidal graphite ductile cast iron, delivering superior fatigue resistance, rigid structural containment, and peak operating pressures up to 350 bar (5,076 psi).
European Standard 4-Bolt Drop-In Interchangeability
Precision-machined to exact European Group 2 4-bolt rectangular mounting dimensions (pilot Ø 36.5 mm, bolt hole spacing 96.0 × 71.5 mm) with standard 1:8 tapered drive shafts, providing zero-modification drop-in substitution across 27 global pump brands including CASAPPA KP20/PHP20.
High Power Density Multi-Circuit Delivery
Compact two-stage tandem envelope allows primary heavy work circuits (up to 33 cm³/rev) and auxiliary control/cooling circuits (up to 30 cm³/rev) to be powered from a single prime mover power take-off.
Heavy-Duty Through-Drive Torque Transmission
Features an induction-hardened internal involute splined through-drive coupling rated to transmit full combined continuous drive torque without driveline backlash or premature spline fretting.
Sustained High Volumetric Efficiency (>94%)
Individual hydrostatic floating thrust balance plates on both pump sections continuously balance axial clearances across temperature and pressure fluctuations, minimizing internal slip and ensuring consistent output flow.
Reduced Noise & Pressure Ripple
High-precision hobbed and shaved gear profiles combined with the superior acoustic dampening of the cast iron front body dramatically reduce operational noise across operator cabs and industrial workstations.
Reference — HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 2PT2F+2PDF 4-Bolt Rectangular Series
Series Architecture Across Group 2PT2F Cast Iron + Group 2PDF Tandem Combinations
The modular 2PT2F+2PDF tandem architecture pairs 11 front cast iron displacements with 10 rear Group 2 displacements, generating over 110 standardized displacement combinations:
Heavy Cast Iron Primary Stage (Group 2PT2F): Displacements 4.0, 6.0, 8.5, 11.0, 14.0, 16.5, 19.5, 22.5, 26.0, 30.0, and 33.0 cm³/rev for high-pressure primary work circuits operating up to 350 bar peak pressure.
Secondary Auxiliary Stage (Group 2PDF): Displacements 4.0, 6.0, 8.5, 11.0, 14.0, 16.5, 19.5, 22.5, 26.0, and 30.0 cm³/rev for priority steering valves, pilot control systems, oil cooling fan motors, and auxiliary brake loops.
Comprehensive Interchangeability Matrix Across 27 Brands
The HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 2PT2F+2PDF 4-Bolt Rectangular Series provides full mechanical, mounting, and hydraulic drop-in substitution for the following 27 international hydraulic manufacturers and their designated pump families:
MARZOCCHI: GHP2A, ALP2A, GHP2, ALP2, 1PD, GHP3, ALP3, GHP3A, ALP3A series tandem and modular gear pumps.
DANFOSS Power Solutions: SNP1NN, SNP3NN, SNW3NN series, SNP2, SNW2 series multi-section hydraulic pumps.
HYDAC: PGE102, PGE103 series, PGE104 series multi-circuit external gear pumps.
ARGO-HYTOS: GP2, GP3, GP1 series tandem external gear pump assemblies.
ATOS: PFG series modular tandem external gear pumps.
Brevini Fluid Power (Dana Brevini): OT100, OT200, OT300 series tandem gear pumps.
BUCHER Hydraulics: AP100, AP200, AP212, AP300 series multi-section gear pumps.
BONDIOLI & PAVESI: HPLPA1, HPLPA2, HPLPA3 series modular tandem gear pump units.
Boden: BAP1 series, BHP1, BAP2, BHP2, BHP3, BAP3 series multi-circuit hydraulic gear pumps.
Caproni: 10A, 20A, 30A, 10C, 20C, 30C series multi-section hydraulic pumps.
CASAPPA: KP20, PHP20, Polaris 20, PLP30 series cast iron and aluminum tandem gear pumps.
CONCENTRIC (Haldex): WP300, WP900, WP1500 series multi-stage external gear pumps.
DUPLOMATIC: 1P, GP2, GP3, GP1 series tandem external gear pumps.
Galtech: 1SPA, 2SPA, 3GPG, 3SPA series multi-circuit tandem hydraulic pumps.
GRH Hydraulics: 1PF, 2PF, 3PF series modular tandem external gear pumps.
HANSA-TMP: 1SP, 2SP, 3GPG, 3SPA series tandem gear pump systems.
HESPER: HA11, HA2, HA3 series, CHP1 series multi-stage hydraulic gear pumps.
HONOR Gear Pumps: 1KH series and Group 2/Group 3 tandem gear pump configurations.
HPI (Hydraulique Professionnelle Industrielle): P1BAN1, P1BAN2, P1AAN2, P1BAN3, P1AAN3 series tandem pumps.
HYDRONIT: E series multi-circuit modular gear pumps.
JIHOSTROJ: P23 series, J series, T3 series, Q2 series, UD series multi-section gear pumps.
PARKER Hannifin: PGP505 series, PGP502 series, PGP511, PGP517 series tandem external gear pumps.
Bosch Rexroth: AZPB series, AZPF, AZPG, AZPN series multi-circuit external gear pumps.
RONZIO: 01ZAG series, 01ZBG series, 02ZAG, 02ZCG, 02ZLG series tandem gear pumps.
ROQUET: 1L0 series, PLA series, GZ series, G series, GLA series, PLC series multi-stage gear pumps.
SDH (Shengda Hydraulics): CBD series multi-section external gear pumps.
VIVOLO (Vivoil): X1P series, XV-1P series, X2P, X3P series, XV-2P, XV-3P series tandem external gear pumps.
Brand Replacement
Quanzhou Hengyuhang Power Technology Co., Ltd. manufactures the 2PT2F+2PDF 4-Bolt Rectangular Tandem Cast Iron Gear Pump Series in strict alignment with European standardized mounting dimensions and high-pressure fluid power specifications. Every tandem unit undergoes 100% computerized end-of-line verification, including simultaneous dual-circuit continuous pressure hold, multi-speed volumetric efficiency mapping (>94%), high-torque through-drive spline integrity testing, and port thread gauge verification. Machinery builders, equipment rebuilders, and hydraulic distributors can replace worn, failed, or long-lead OEM tandem pumps from CASAPPA (KP20 / PHP20 / Polaris), Rexroth, MARZOCCHI, PARKER, and DANFOSS with zero machine modifications, zero bracket reworking, and zero driveline realignment. Custom displacement combinations, specialized shaft profiles, common inlet manifolds, and integrated pressure relief or priority valves are fully supported with agile production schedules.
Applications — HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 2PT2F+2PDF 4-Bolt Rectangular Series
Mobile Construction Machinery: Mini-excavators, compact wheel loaders, skid-steer loaders, backhoes, and compact trenchers requiring high-pressure boom/bucket hydraulics paired with independent hydrostatic power steering or pilot controls.
Agricultural & Harvesting Equipment: Utility tractors, self-propelled sprayers, orchard tractors, combine harvesters, and balers operating dual work circuits from a single engine drive pad.
Material Handling & Aerial Equipment: Compact rough-terrain forklifts, electric/diesel scissor lifts, articulating boom lifts, and truck-mounted tailgate lifts requiring segregated main hoist and auxiliary steering circuits.
Forestry & Lawn Maintenance Machinery: Log splitters, wood chippers, commercial zero-turn mowers, and stump grinders.
Stationary Industrial Hydraulic Power Units (HPUs): Compact hydraulic presses, waste compactor balers, machine tool clamping systems, and lube oil cooling loops.
Municipal & Utility Vehicles: Refuse collection packing mechanisms, street sweepers, snow plow blade angle/lift systems, and utility aerial bucket trucks.
Package & Shipping
| Packaging | Neutral heavy-duty export carton with form-fitting high-density molded foam cushioning; individual sealed anti-corrosion VCI barrier bags; export standard fumigation-free wooden pallet consolidation for batch orders. |
|---|---|
| Selling Unit | Single item (MOQ: 1 piece for standard displacement configurations; low MOQ for customized OEM combinations). |
| Single Package Size | 38.0 × 24.0 × 22.0 cm (14.96 × 9.45 × 8.66 in) per tandem pump assembly. |
| Single Gross Weight | 8.50 to 14.80 kg (18.74 to 32.63 lbs) depending on displacement pairing and port options. |
| Standard Lead Time | 3–7 business days for stock displacement pairings; 15–20 business days for tailored OEM batch production. |
| Logistics & Express | Air express (DHL, FedEx, UPS, TNT), air freight, ocean freight (FCL / LCL), and multimodal door-to-door DDP logistics with full tracking. |
| Customization Services | Custom nameplate laser engraving, private brand labeling, specialized shaft spline profiles, custom port threads, and factory CAD verification. |
Why Choose Hengyuhang?
Direct Factory Precision Manufacturing & CNC Excellence: Hengyuhang operates an advanced precision manufacturing facility equipped with multi-axis CNC machining centers, high-speed gear hobbing equipment, and CNC gear profile grinding machines. Operating clearances and gear tooth profiles are held to sub-micron tolerances (Ra < 0.2 μm), ensuring flawless gear meshing, structural rigidity, and long service life.
100% Full-Cycle Multi-Parameter Factory Inspection: Every tandem pump unit undergoes rigorous computerized testing prior to packaging. Testing protocols encompass multi-speed volumetric efficiency benchmarking (>94%), continuous rated and peak pressure endurance, internal casing leakage measurement, through-drive intermediate coupling load verification, and digital acoustic spectrum analysis to guarantee zero-defect delivery.
Seamless 1:1 OEM Drop-In Interchangeability: Engineered to precise European Group 2 4-bolt rectangular flange, standard 1:8 tapered shaft, and port centerline dimensions, Hengyuhang pumps provide 100% form, fit, and functional drop-in replacement for over 27 global hydraulic manufacturers without mounting bracket or plumbing alterations.
Flexible Engineering Customization & Rapid Prototyping: Supported by an experienced hydraulic engineering team, Hengyuhang provides tailored solutions including non-standard displacement combinations, common or separate suction port routing, integrated pressure relief or priority flow control valves, and low-MOQ rapid sampling for new machinery development.
Robust Supply Chain, Extensive Inventory & Fast Global Dispatch: With large strategic raw material reserves of ductile cast-iron and aerospace-grade aluminum extrusions, standard displacement assemblies ship within 48 to 72 hours. Comprehensive international logistics channels ensure dependable door-to-door DDP delivery worldwide.
12-Month Comprehensive Warranty & Lifetime Technical Support: All products are backed by an unconditional 12-month factory warranty. Hengyuhang's dedicated fluid power engineers provide rapid 24-hour CAD mounting verification, cross-reference model decoding, and lifetime technical support for distributors and OEMs worldwide.
Tandem Cast Iron Hydraulic Gear Pump Group 2PT2F+2PDF 4-Bolt Rectangular Series (4.95~33.03 + 4.00~30.00 cm³/rev) is a specialized hybrid dual-stage external gear pump engineered to deliver high-pressure mechanical stiffness on the primary circuit and lightweight, responsive flow on the secondary circuit from a single prime mover. Equipped with an industry-standard European standard Group 2 4-bolt rectangular mounting flange (pilot Ø36.5 mm with 71.5 × 96.2 mm bolt pitch), this modular assembly combines a heavy-duty spheroidal graphite ductile cast-iron front pump (2PT2F) and an extruded aerospace-grade aluminum alloy rear pump (2PDF), joined by a high-tensile internal spline through-drive coupling shaft. The front cast-iron stage provides exceptional structural rigidity and fatigue resistance, completely eliminating housing barrel dilation under cyclic continuous working pressures (p1) up to 285 bar (4,133 psi) and peak pressures (p3) up to 330 bar (4,785 psi). The rear aluminum stage provides agile auxiliary hydraulic flow with operating pressures up to 250 bar (3,625 psi) while substantially reducing total pump weight. Featuring 9 standardized front displacements (4.95 to 33.03 cm³/rev) and 10 standardized rear displacements (4.00 to 30.00 cm³/rev), the 2PT2F+2PDF series provides modular combined delivery capacities from 8.95 up to 63.03 cm³/rev. Operating with case-hardened alloy steel precision gears and hydrostatic floating axial pressure balance thrust plates, this series maintains volumetric efficiencies above 94% and serves as a direct 1:1 drop-in replacement for CASAPPA KAPPA+POLARIS (KP20+PLP20), Bosch Rexroth (AZPG+AZPF), Marzocchi (GHP2+ALP2), and Parker PGP511 European 4-bolt dual gear pumps.
| Applications
The 2PT2F+2PDF hybrid cast-iron/aluminum 4-bolt rectangular tandem hydraulic gear pump series is specifically engineered for multi-circuit mobile and industrial machinery where the primary circuit requires severe-duty cyclic pressure handling while the auxiliary circuit powers lower-pressure positioning, cooling, or pilot functions:
Agricultural Tractors & Harvesters: The primary cast-iron stage (2PT2F) powers high-pressure front-end loader cylinders and heavy rear three-point implement hitches under continuous heavy shock loads, while the secondary aluminum stage (2PDF) delivers smooth, responsive flow for hydrostatic power steering and auxiliary spool valves.
Skid Steer & Compact Wheel Loaders: Front ductile cast-iron stage provides high-pressure continuous fluid to auxiliary hydraulic attachment circuits (trenchers, hydraulic breakers, grapples), while the secondary aluminum stage supplies pilot control, charge pressure, and cooling circulation loops.
Rough-Terrain Forklifts & Telehandlers: Heavy-duty front stage handles heavy mast lift and boom extension loads with zero housing deflection, while the rear aluminum stage reliably operates side-shift, tilt, and steering circuits.
Mini Excavators & Compact Construction Machines: Powers boom and arm digging functions on the high-stiffness primary stage, with the secondary stage dedicated to dozer blade positioning, track expansion, and cab auxiliary functions.
High-Low Dual-Speed Hydraulic Presses: Functions as an energy-efficient high-low pump combination where both stages combine during rapid cylinder approach, and the rear aluminum stage unloads to reservoir while the front cast-iron stage maintains high holding pressure up to 285 bar without risk of housing fatigue.
Municipal & Utility Work Vehicles: Delivers reliable dual fluid power for refuse packer blade compactors or municipal utility aerial buckets on the front stage, alongside independent power steering on the rear stage.
| Key Specifications Overview
| Parameter | Specification |
|---|---|
| Series Architecture | Hybrid Severe-Duty Tandem External Gear Pump (Group 2 Cast Iron Front 2PT2F + Group 2 Aluminum Rear 2PDF) |
| Front Stage Displacement (2PT2F) | 4.95 ~ 33.03 cm³/rev (9 standard sizes: 4.95, 6.61, 8.26, 11.23, 14.53, 16.85, 21.14, 26.42, 33.03 cm³/rev) |
| Rear Stage Displacement (2PDF) | 4.00 ~ 30.00 cm³/rev (10 standard sizes: 4.00, 6.00, 8.50, 11.00, 14.00, 16.50, 19.50, 22.50, 26.00, 30.00 cm³/rev) |
| Total Combined Displacement Range | 8.95 ~ 63.03 cm³/rev (modular dual-stage independent combinations: V1 + V2) |
| Front Stage Working Pressure (p1/p2/p3) | Continuous (p1) 140 ~ 285 bar (2,030 ~ 4,133 psi); Intermittent (p2) 160 ~ 300 bar; Peak (p3) 180 ~ 330 bar |
| Rear Stage Working Pressure (p1/p2/p3) | Continuous (p1) 170 ~ 250 bar (2,465 ~ 3,625 psi); Intermittent (p2) 190 ~ 275 bar; Peak (p3) 210 ~ 300 bar |
| Rotational Speed Range | Min. speed: 500 ~ 700 min⁻¹; Max. speed: 2000 ~ 3500 min⁻¹ (determined by combined stage ratings) |
| Volumetric Efficiency | ≥ 94% across rated operating pressure and thermal range |
| Hydro-Mechanical Efficiency | ≥ 89% ~ 92% |
| Body & Housing Construction | Front 2PT2F: Spheroidal graphite ductile cast iron (flange, gear housing, intermediate plate); Rear 2PDF: High-strength extruded aluminum alloy body with ductile iron/aluminum rear cover |
| Mounting Flange Standard | European standard 4-bolt rectangular mounting flange (pilot Ø36.5 mm with 71.5 × 96.2 mm bolt pitch, 4 × Ø9.0 mm holes, flange face 89.5 × 114.2 mm) |
| Drive Shaft Specification | European standard 1:8 taper shaft with woodruff key (key 3.15 × 6.5 × 16.0 mm, M12×1.5 retaining nut tightened to 40 Nm, max drive torque 140 Nm / 1,239 lbf in, Ø16.65 mm taper base, 39.7 mm extension) |
| Intermediate Through-Drive Coupling | Heavy-duty alloy steel internal spline intermediate through-drive shaft (max torque transfer capacity: up to 140 Nm) |
| Hydraulic Port Connections | Front stage: BSPP G 1/2 or G 3/4 thread; Rear stage: European standard 4-bolt diamond flange or BSPP threaded ports |
| Rotation Direction | Clockwise (D / Right-Hand) standard; Counter-Clockwise (S / Left-Hand) available upon request (viewed from drive shaft end) |
| Hydraulic Fluid Compatibility | Mineral-oil-based hydraulic fluids (HL / HLP to ISO 6743/4; DIN 51524 Class 1 and 2); optimal viscosity range: 20 ~ 80 mm²/s (cSt) |
| Operating Temperature Range | -20°C to +85°C (standard NBR seals); -15°C to +110°C (optional Viton FKM seals) |
| Assembly Tightening Torques | Flange mounting bolts: 45 ± 3 Nm (398 ÷ 425 lbf in); Front cast-iron tie-rod bolts: 70 ± 7 Nm; Rear aluminum tie-rod bolts: 60 ± 4 Nm |
| Technical Performance Matrix Across Available Stages
| Section & Model Code | Displacement cm³/rev (in³/rev) | Operating Pressure (bar / psi) | Speed Range (min⁻¹) | Flow @ 1500 rpm (L/min) | Stage Material | |||
|---|---|---|---|---|---|---|---|---|
| Continuous (p1) | Intermittent (p2) | Peak (p3) | Min. Speed | Max. Speed | ||||
| Front Primary Stage (Group 2PT2F Cast Iron Series — High Pressure) | ||||||||
| 2PT2F-4 | 4.95 (0.30) | 285 / 4,133 | 300 / 4,350 | 330 / 4,785 | 350 | 4000 | 7.43 | Ductile Cast Iron |
| 2PT2F-6.3 | 6.61 (0.40) | 285 / 4,133 | 300 / 4,350 | 330 / 4,785 | 350 | 4000 | 9.92 | Ductile Cast Iron |
| 2PT2F-8 | 8.26 (0.50) | 285 / 4,133 | 300 / 4,350 | 330 / 4,785 | 350 | 3500 | 12.39 | Ductile Cast Iron |
| 2PT2F-11.2 | 11.23 (0.69) | 275 / 3,988 | 290 / 4,205 | 320 / 4,640 | 350 | 3500 | 16.85 | Ductile Cast Iron |
| 2PT2F-14 | 14.53 (0.89) | 265 / 3,843 | 290 / 4,205 | 320 / 4,640 | 350 | 3500 | 21.80 | Ductile Cast Iron |
| 2PT2F-16 | 16.85 (1.03) | 260 / 3,770 | 290 / 4,205 | 320 / 4,640 | 300 | 3000 | 25.28 | Ductile Cast Iron |
| 2PT2F-20 | 21.14 (1.29) | 210 / 3,045 | 230 / 3,335 | 250 / 3,625 | 300 | 3000 | 31.71 | Ductile Cast Iron |
| 2PT2F-25 | 26.42 (1.61) | 180 / 2,610 | 200 / 2,900 | 220 / 3,190 | 300 | 2500 | 39.63 | Ductile Cast Iron |
| 2PT2F-31.5 | 33.03 (2.01) | 140 / 2,030 | 160 / 2,320 | 180 / 2,610 | 300 | 2000 | 49.55 | Ductile Cast Iron |
| Rear Secondary Stage (Group 2PDF Aluminum Series — Auxiliary/Secondary Flow) | ||||||||
| 2PDF-4H-04 | 4.00 (0.244) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 700 | 4000 | 6.00 | Extruded Aluminum |
| 2PDF-4H-06 | 6.00 (0.366) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 700 | 4000 | 9.00 | Extruded Aluminum |
| 2PDF-4H-08 | 8.50 (0.518) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 700 | 3800 | 12.75 | Extruded Aluminum |
| 2PDF-4H-11 | 11.00 (0.671) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 600 | 3800 | 16.50 | Extruded Aluminum |
| 2PDF-4H-14 | 14.00 (0.854) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 600 | 3500 | 21.00 | Extruded Aluminum |
| 2PDF-4H-16 | 16.50 (1.006) | 230 / 3,335 | 255 / 3,698 | 280 / 4,060 | 600 | 3500 | 24.75 | Extruded Aluminum |
| 2PDF-4H-19 | 19.50 (1.189) | 210 / 3,045 | 235 / 3,408 | 260 / 3,770 | 500 | 3200 | 29.25 | Extruded Aluminum |
| 2PDF-4H-22 | 22.50 (1.372) | 200 / 2,900 | 225 / 3,263 | 250 / 3,625 | 500 | 3000 | 33.75 | Extruded Aluminum |
| 2PDF-4H-26 | 26.00 (1.586) | 180 / 2,610 | 205 / 2,973 | 230 / 3,335 | 500 | 3000 | 39.00 | Extruded Aluminum |
| 2PDF-4H-30 | 30.00 (1.830) | 170 / 2,465 | 190 / 2,755 | 210 / 3,045 | 500 | 2800 | 45.00 | Extruded Aluminum |
| Mechanical Drive Guidelines & Torque Limitations
| Mechanical Parameter | Engineering Specification & Limit |
|---|---|
| Primary Shaft Max. Drive Torque (T1_max) | 140 Nm (1,239 lbf in) continuous rating for European 1:8 taper shaft with M12×1.5 nut and 3.15 mm woodruff key |
| Intermediate Coupling Torque Limit (T2_max) | 140 Nm (1,239 lbf in) max torque transfer capacity for hardened internal spline intermediate through-drive shaft |
| Cumulative Drive Torque Verification Formula | T_total = (V1 × p1) / (20 × π × η_hm) + (V2 × p2) / (20 × π × η_hm) ≤ 140 Nm |
| Recommended Stage Sequencing Rule | Always mount the higher-torque ductile cast-iron stage at the front (2PT2F) and the secondary auxiliary stage at the rear (2PDF) to protect through-drive coupling life |
| Intermediate Adapter Assembly Thickness | 38.0 mm heavy-duty ductile iron intermediate adapter with dual radial sealing and internal drainage |
| European 4-Bolt Mounting Flange, Shaft & Port Details
| Interface Feature | Technical Standard & Dimension |
|---|---|
| Mounting Flange | European standard Group 2 4-bolt rectangular mounting flange (overall face 89.5 × 114.2 mm) |
| Centering Pilot | Ø36.5 mm pilot diameter (-0.025 / -0.050 mm tolerance) with 5.0 mm pilot depth |
| Bolt Hole Pitch & Pattern | 71.5 × 96.2 mm bolt pitch with 4 × Ø9.0 mm through mounting holes |
| Primary Drive Shaft | European standard 1:8 taper shaft with woodruff key (key 3.15 × 6.5 × 16.0 mm, M12×1.5 retaining nut, Ø16.65 mm taper base, 39.7 mm shaft extension from pilot face) |
| Intermediate Coupling Shaft | High-strength alloy steel internal spline through-drive coupling connecting Group 2 cast-iron and aluminum stages (allowable intermediate torque: up to 140 Nm) |
| Front Stage Port Connections (2PT2F) | BSPP cylindrical thread (UNI - ISO 228): G 1/2 (depth 20 mm) for 4.95~14.53 cc; G 3/4 (depth 22 mm) for 16.85~33.03 cc |
| Rear Stage Port Connections (2PDF) | European standard 4-bolt diamond flange (M6/M8 bolts) or optional BSPP cylindrical thread (G 1/2, G 3/4) |
| 1:1 Direct-Fit OEM Brand Replacement Coverage
| Manufacturer Brand | Direct-Fit Drop-In Tandem Equivalent Series |
|---|---|
| CASAPPA | KAPPA + POLARIS Hybrid Series (KP20 Cast Iron + PLP20 Aluminum with European 4-bolt rectangular flange) |
| Bosch Rexroth | AZPG + AZPF Group 2 European 4-bolt multiple gear pumps (Cast Iron Front + Aluminum Rear) |
| MARZOCCHI | GHP2 + ALP2 / 2P European 4-bolt modular tandem gear pumps |
| PARKER Hannifin | PGP511 Cast Iron Front + PGP511 Aluminum Rear European standard dual external gear pumps |
| DANFOSS / Turolla | Group 2 Heavy Cast Iron Front + SNP2 Aluminum Rear multiple gear pumps |
| SALAMI | 2PB Cast Iron + 2PE Aluminum dual gear pumps with European rectangular spigot pilot |
| BUCHER Hydraulics | QX2 / AP212 Cast Iron Front + AP212 Aluminum Rear European 4-bolt double gear pump assemblies |
| Technical Performance Matrix Across Available Stages
| Section & Model Code | Displacement cm³/rev (in³/rev) | Operating Pressure (bar / psi) | Speed Range (min⁻¹) | Flow @ 1500 rpm (L/min) | Stage Material | |||
|---|---|---|---|---|---|---|---|---|
| Continuous (p1) | Intermittent (p2) | Peak (p3) | Min. Speed | Max. Speed | ||||
| Front Primary Stage (Group 2PT2F Cast Iron Series — High Pressure) | ||||||||
| 2PT2F-4 | 4.95 (0.30) | 285 / 4,133 | 300 / 4,350 | 330 / 4,785 | 350 | 4000 | 7.43 | Ductile Cast Iron |
| 2PT2F-6.3 | 6.61 (0.40) | 285 / 4,133 | 300 / 4,350 | 330 / 4,785 | 350 | 4000 | 9.92 | Ductile Cast Iron |
| 2PT2F-8 | 8.26 (0.50) | 285 / 4,133 | 300 / 4,350 | 330 / 4,785 | 350 | 3500 | 12.39 | Ductile Cast Iron |
| 2PT2F-11.2 | 11.23 (0.69) | 275 / 3,988 | 290 / 4,205 | 320 / 4,640 | 350 | 3500 | 16.85 | Ductile Cast Iron |
| 2PT2F-14 | 14.53 (0.89) | 265 / 3,843 | 290 / 4,205 | 320 / 4,640 | 350 | 3500 | 21.80 | Ductile Cast Iron |
| 2PT2F-16 | 16.85 (1.03) | 260 / 3,770 | 290 / 4,205 | 320 / 4,640 | 300 | 3000 | 25.28 | Ductile Cast Iron |
| 2PT2F-20 | 21.14 (1.29) | 210 / 3,045 | 230 / 3,335 | 250 / 3,625 | 300 | 3000 | 31.71 | Ductile Cast Iron |
| 2PT2F-25 | 26.42 (1.61) | 180 / 2,610 | 200 / 2,900 | 220 / 3,190 | 300 | 2500 | 39.63 | Ductile Cast Iron |
| 2PT2F-31.5 | 33.03 (2.01) | 140 / 2,030 | 160 / 2,320 | 180 / 2,610 | 300 | 2000 | 49.55 | Ductile Cast Iron |
| Rear Secondary Stage (Group 2PDF Aluminum Series — Auxiliary/Secondary Flow) | ||||||||
| 2PDF-4H-04 | 4.00 (0.244) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 700 | 4000 | 6.00 | Extruded Aluminum |
| 2PDF-4H-06 | 6.00 (0.366) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 700 | 4000 | 9.00 | Extruded Aluminum |
| 2PDF-4H-08 | 8.50 (0.518) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 700 | 3800 | 12.75 | Extruded Aluminum |
| 2PDF-4H-11 | 11.00 (0.671) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 600 | 3800 | 16.50 | Extruded Aluminum |
| 2PDF-4H-14 | 14.00 (0.854) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 600 | 3500 | 21.00 | Extruded Aluminum |
| 2PDF-4H-16 | 16.50 (1.006) | 230 / 3,335 | 255 / 3,698 | 280 / 4,060 | 600 | 3500 | 24.75 | Extruded Aluminum |
| 2PDF-4H-19 | 19.50 (1.189) | 210 / 3,045 | 235 / 3,408 | 260 / 3,770 | 500 | 3200 | 29.25 | Extruded Aluminum |
| 2PDF-4H-22 | 22.50 (1.372) | 200 / 2,900 | 225 / 3,263 | 250 / 3,625 | 500 | 3000 | 33.75 | Extruded Aluminum |
| 2PDF-4H-26 | 26.00 (1.586) | 180 / 2,610 | 205 / 2,973 | 230 / 3,335 | 500 | 3000 | 39.00 | Extruded Aluminum |
| 2PDF-4H-30 | 30.00 (1.830) | 170 / 2,465 | 190 / 2,755 | 210 / 3,045 | 500 | 2800 | 45.00 | Extruded Aluminum |
| Manufacturer Brand | Direct-Fit Drop-In Tandem Equivalent Series |
|---|---|
| CASAPPA | KAPPA + POLARIS Hybrid Series (KP20 Cast Iron + PLP20 Aluminum with European 4-bolt rectangular flange) |
| Bosch Rexroth | AZPG + AZPF Group 2 European 4-bolt multiple gear pumps (Cast Iron Front + Aluminum Rear) |
| MARZOCCHI | GHP2 + ALP2 / 2P European 4-bolt modular tandem gear pumps |
| PARKER Hannifin | PGP511 Cast Iron Front + PGP511 Aluminum Rear European standard dual external gear pumps |
| DANFOSS / Turolla | Group 2 Heavy Cast Iron Front + SNP2 Aluminum Rear multiple gear pumps |
| SALAMI | 2PB Cast Iron + 2PE Aluminum dual gear pumps with European rectangular spigot pilot |
| BUCHER Hydraulics | QX2 / AP212 Cast Iron Front + AP212 Aluminum Rear European 4-bolt double gear pump assemblies |
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