Gear pump
Tandem Cast Iron Hydraulic Gear Pump 2PT2F+2PDF SAE A 2-Bolt
Hengyuhang Tandem Cast Iron Hydraulic Gear Pump 2PT2F+2PDF SAE A 2-Bolt Series pairs a heavy-duty cast iron front stage with a precision Group 2 secondary stage in an SAE A 2-bolt 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 SAE A 2-Bolt Series
Engineered for demanding 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 SAE A 2-Bolt 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 SAE A 2-Bolt Series
The HENGYUHANG 2PT2F+2PDF SAE A 2-Bolt Series delivers an engineered hybrid-architecture dual-circuit fluid power solution. 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 entirely separate fluid circuits with independent operating pressures and flows.
Featuring an industry-standard SAE A 2-bolt oval mounting flange (pilot Ø 82.55 mm / 3.25 inches, bolt hole center-to-center spacing 106.4 mm / 4.19 inches), 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 or cast-iron construction according to specification. 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 SAE A 2-Bolt Series
Interface data needed with the drawing:
| Item | Value |
|---|---|
| Front mounting flange | Standard SAE A 2-bolt oval mounting flange (pilot Ø 82.55 mm / 3.25" h8, bolt hole center-to-center distance 106.4 mm / 4.187", clearance holes Ø 11.0 mm / 7/16" or slotted for 3/8" / 1/2" hardware) |
| Primary drive shaft | SAE A 9-tooth involute splined shaft (5/8" 16/32 DP, flat root side fit) / SAE A 11-tooth involute splined shaft (3/4" 16/32 DP) / SAE A Ø 19.05 mm (3/4") cylindrical keyed shaft with 4.76 mm (3/16") square key / Optional 1:8 European taper shaft with M12 × 1.25 nut |
| 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) | SAE straight thread O-ring boss (UN/UNF) / 4-bolt SAE split flange (Code 61) / European 4-bolt diamond flange / BSPP threaded ports |
| Rear stage ports (2PDF) | European 4-bolt diamond flange / SAE straight thread O-ring boss (UN/UNF) / BSPP cylindrical threaded ports |
| 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 SAE A flange; high-tensile aluminum alloy or ductile iron rear body and rear end-plate |
| SAE A mounting bolt torque | 45 ± 5 Nm (33 ÷ 37 lbf ft) for Grade 8.8 / Grade 5 mounting hardware |
| 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 SAE A 2-Bolt Series
The HENGYUHANG 2PT2F+2PDF tandem cast iron series utilizes an unambiguous modular model numbering system:
Code structure — reference: 2PT2F+2PDF-SAEA2 — Cast Iron Front Group 2 + Group 2 SAE A 2-Bolt 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 | SA9 / SA11 / CA19 / T2 | SA9: SAE A 9T spline; SA11: SAE A 11T spline; CA19: SAE A Ø 19.05 mm keyed shaft; T2: 1:8 European taper shaft |
| Mounting Flange | A2 | Standard SAE A 2-bolt oval mounting flange (pilot Ø 82.55 mm, 106.4 mm bolt spacing) |
| Inlet Routing | S / C | S: Separate dual suction ports (independent circuits); C: Common single merged suction inlet |
| Port Types | UN / SF / EF / G | UN: SAE O-ring boss; SF: SAE split flange; EF: European diamond flange; G: BSPP thread |
| Seals | N / V | N: Buna-N (NBR) standard; V: Viton (FKM) high-temperature / synthetic fluid seals |
| Auxiliary Options | RV / FD / ST | RV: Integrated pressure relief valve; FD: Priority flow divider valve; ST: Customized OEM specification |
| Reading your replacement code
| Your Target Brand & Model | HENGYUHANG 2PT2F+2PDF Equivalent | Interchange Verification Notes |
|---|---|---|
| CASAPPA KP20 / PHP20 + PLP20 (SAE A 2-Bolt) | HENGYUHANG 2PT2F+2PDF Series | 100% direct drop-in; identical SAE A pilot Ø 82.55 mm, 9T/11T splined shaft, cast iron front body, and displacement match |
| Bosch Rexroth AZPF + AZPF Tandem (SAE A) | HENGYUHANG 2PT2F+2PDF Series | Seamless mechanical envelope, shaft spline fit, and enhanced cast iron front pressure performance |
| MARZOCCHI GHP2A + ALP2A Tandem (SAE A) | HENGYUHANG 2PT2F+2PDF Series | Exact match on SAE A flange spigot, port drilling centers, and through-drive torque ratings |
| PARKER PGP511 + PGP505 / PGP511 Tandem | HENGYUHANG 2PT2F+2PDF Series | Complete bolt-hole, shaft spline, 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 (SAE 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 SAE A 2-bolt mounting flange, drive shaft, and hydraulic flow characteristics |
| Techspecs of HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 2PT2F+2PDF SAE A 2-Bolt 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 SAE A 2-Bolt 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).
Direct SAE A 2-Bolt Drop-In Interchangeability
Precision-machined to exact SAE J744 A 2-bolt oval mounting dimensions (pilot Ø 82.55 mm, bolt hole spacing 106.4 mm) with standard 9T/11T splined or keyed 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 SAE A 2-Bolt 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 SAE A 2-Bolt Series provides full mechanical, mounting, and hydraulic drop-in substitution for the following 27 international hydraulic manufacturers and their designated pump families:
MARZOCCHI: GHP2A, ALP2A, GHP2, ALP2, 1PD, GHP3, ALP3, GHP3A, ALP3A series tandem and modular gear pumps.
DANFOSS Power Solutions: SNP1NN, SNP3NN, SNW3NN series, SNP2, SNW2 series multi-section hydraulic pumps.
HYDAC: PGE102, PGE103 series, PGE104 series multi-circuit external gear pumps.
ARGO-HYTOS: GP2, GP3, GP1 series tandem external gear pump assemblies.
ATOS: PFG series modular tandem external gear pumps.
Brevini Fluid Power (Dana Brevini): OT100, OT200, OT300 series tandem gear pumps.
BUCHER Hydraulics: AP100, AP200, AP212, AP300 series multi-section gear pumps.
BONDIOLI & PAVESI: HPLPA1, HPLPA2, HPLPA3 series modular tandem gear pump units.
Boden: BAP1 series, BHP1, BAP2, BHP2, BHP3, BAP3 series multi-circuit hydraulic gear pumps.
Caproni: 10A, 20A, 30A, 10C, 20C, 30C series multi-section hydraulic pumps.
CASAPPA: 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 SAE A 2-Bolt Tandem Cast Iron Gear Pump Series in strict alignment with international SAE J744 mounting standards 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 SAE A 2-Bolt 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 SAE J744 A 2-bolt oval flange, standard 9T/11T splined or keyed shaft, and port centerline dimensions, Hengyuhang pumps provide 100% form, fit, and functional drop-in replacement for over 27 global hydraulic manufacturers without mounting bracket or plumbing alterations.
Flexible Engineering Customization & Rapid Prototyping: Supported by an experienced hydraulic engineering team, Hengyuhang provides tailored solutions including non-standard displacement combinations, common or separate suction port routing, integrated pressure relief or priority flow control valves, and low-MOQ rapid sampling for new machinery development.
Robust Supply Chain, Extensive Inventory & Fast Global Dispatch: With large strategic raw material reserves of 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 SAE A 2-Bolt Series (4.95~33.03 + 4~30 cm³/rev) is a specialized hybrid dual-stage external gear pump engineered to provide maximum structural durability, high continuous working pressures, and dual independent circuit control from a single prime mover. Equipped with an industry-standard SAE J744 SAE A 2-bolt oval mounting flange (pilot Ø82.55 mm / 3.250 in, 106.4 mm / 4.189 in bolt center distance), this multi-section unit integrates a severe-duty ductile cast-iron front pump (2PT2F) with a lightweight, high-efficiency extruded aluminium alloy rear pump (2PDF) via a heavy-duty internal spline through-drive intermediate coupling. Designed for extreme applications where single-body or standard aluminium front pumps experience housing fatigue or pressure spike dilation, the cast iron primary stage (2PT2F) covers 9 displacements from 4.95 to 33.03 cm³/rev and withstands continuous pressures up to 285 bar (4,133 psi) with peak shock resistance up to 330 bar (4,785 psi). The aluminium secondary stage (2PDF) covers 10 displacements from 4.0 to 30.0 cm³/rev with continuous pressures up to 250 bar (3,625 psi), delivering a broad combined displacement capacity from 8.95 up to 63.03 cm³/rev. Incorporating case-hardened alloy steel precision gears and hydrostatic axial pressure-balanced DU composite thrust bushings, this tandem series sustains over 94% volumetric efficiency 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 dual gear pumps.
| Applications
The 2PT2F+2PDF SAE A 2-bolt hybrid tandem hydraulic gear pump is specifically engineered for severe-duty mobile machinery and high-stress industrial fluid power systems where the primary circuit experiences heavy hydraulic shock loads, high continuous pressures, or severe duty cycles, while the secondary circuit powers auxiliary, steering, or pilot functions:
Skid Steer Loaders & Compact Track Loaders: The heavy cast iron front stage (2PT2F) withstands extreme hydraulic shock loads and cyclic pressure spikes when powering front hydraulic work attachments, trenchers, or cold planers, while the rear stage (2PDF) provides stable, dedicated flow for hydrostatic steering and lift/tilt pilot circuits.
Agricultural Tractors & Harvesters: The primary cast iron pump drives heavy front-loader cylinders and continuous high-pressure implement circuits, while the secondary aluminium pump powers priority hydrostatic steering, power braking, and cab control hydraulics without flow fluctuations.
Compact Wheel Loaders & Mini Excavators: Applied in rough-terrain mobile construction equipment where the high-pressure cast iron front section powers main boom and arm cylinders, and the secondary section provides smooth, responsive flow for auxiliary attachments and swing motor circuits.
Rough-Terrain Forklifts & Telehandlers: The primary cast iron stage handles continuous heavy mast lifting under full rated load, while the rear section supplies smooth hydraulic fluid for carriage side-shift, fork tilting, and hydrostatic steering.
Dual-Pressure Hydraulic Press Power Packs: Functions as a compact high-low pump assembly where both stages combine during rapid cylinder approach, and the circuit unloads the rear stage while the rugged cast iron front stage delivers final high-tonnage clamping pressure without housing dilation.
Refuse Trucks & Municipal Utility Vehicles: Powers heavy waste compaction packing blades and container tippers under high thermal and mechanical cyclic shock loads.
| Key Specifications Overview
| Parameter | Specification |
|---|---|
| Series Architecture | Hybrid Dual-Stage External Gear Pump (Group 2 Cast Iron Front 2PT2F + Group 2 Aluminium 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: 4.0, 6.0, 8.5, 11.0, 14.0, 16.5, 19.5, 22.5, 26.0, 30.0 cm³/rev) |
| Total Combined Displacement Range | 8.95 ~ 63.03 cm³/rev (fully modular independent displacement selection: V1 + V2) |
| Continuous Operating Pressure (p1) | Front (2PT2F Cast Iron): 140 ~ 285 bar (285 bar for 4.95~8.26 cc) / Rear (2PDF Aluminium): 170 ~ 250 bar (250 bar for 4~14 cc) |
| Intermittent Operating Pressure (p2) | Front (2PT2F Cast Iron): 160 ~ 300 bar (300 bar for 4.95~8.26 cc) / Rear (2PDF Aluminium): 190 ~ 275 bar |
| Max. Peak Pressure (p3) | Front (2PT2F Cast Iron): 180 ~ 330 bar (4,785 psi peak) / Rear (2PDF Aluminium): 210 ~ 300 bar (4,350 psi peak) |
| Operating Speed Range | 500 ~ 3500 r/min (up to 4000 r/min for smaller displacement pairings; min. speed 350 r/min) |
| Volumetric Efficiency | ≥ 94% across rated pressure and operating thermal envelope |
| Body & Housing Construction | Front stage: High-density spheroidal graphite ductile cast iron (casing and flange); Rear stage: Extruded high-tensile aluminium alloy |
| Mounting Flange Standard | SAE J744 SAE A 2-bolt oval flange (pilot Ø82.55 mm / 3.250 in, 106.4 mm / 4.189 in bolt center pitch, 2 × Ø11.1 mm through holes) |
| Primary Drive Shaft Options | SAE A 9-tooth involute spline (16/32 DP), SAE A 11-tooth involute spline, or SAE A cylindrical straight keyed shaft (Ø15.88 mm / 5/8 in or Ø19.05 mm / 3/4 in) |
| Intermediate Coupling Mechanism | Hardened high-tensile alloy steel internal spline through-drive coupling shaft connecting front cast iron and rear aluminium sections |
| Hydraulic Port Connections | Independent ports: SAE straight thread O-ring boss (UNF) or BSPP cylindrical thread; common suction port available on request |
| 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 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: 70 ± 5 Nm; Front cast-iron tie-rod bolts: 70 ± 7 Nm; Rear aluminium tie-rod bolts: 60 ± 4 Nm |
| Technical Performance Matrix Across Available Stages
| Primary Front Stage: Group 2 Cast Iron (2PT2F) | Secondary Rear Stage: Group 2 Aluminium (2PDF) | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Model Code | Displ. (cm³/rev) | p1 (bar) | p3 Peak (bar) | Max Speed (min⁻¹) | Model Code | Displ. (cm³/rev) | P1 (bar) | P3 Peak (bar) | Flow @ 1500 rpm |
| 2PT2F-4 | 4.95 | 285 | 330 | 4000 | 2PDF-04 | 4.00 | 250 | 300 | 6.0 L/min |
| 2PT2F-6.3 | 6.61 | 285 | 330 | 4000 | 2PDF-06 | 6.00 | 250 | 300 | 9.0 L/min |
| 2PT2F-8 | 8.26 | 285 | 330 | 3500 | 2PDF-08 | 8.50 | 250 | 300 | 12.8 L/min |
| 2PT2F-11.2 | 11.23 | 275 | 320 | 3500 | 2PDF-11 | 11.00 | 250 | 300 | 16.5 L/min |
| 2PT2F-14 | 14.53 | 265 | 320 | 3500 | 2PDF-14 | 14.00 | 250 | 300 | 21.0 L/min |
| 2PT2F-16 | 16.85 | 260 | 320 | 3000 | 2PDF-16 | 16.50 | 230 | 280 | 24.8 L/min |
| 2PT2F-20 | 21.14 | 210 | 250 | 3000 | 2PDF-19 | 19.50 | 210 | 260 | 29.3 L/min |
| 2PT2F-25 | 26.42 | 180 | 220 | 2500 | 2PDF-22 | 22.50 | 200 | 250 | 33.8 L/min |
| 2PT2F-31.5 | 33.03 | 140 | 180 | 2000 | 2PDF-26 | 26.00 | 180 | 230 | 39.0 L/min |
| - | 2PDF-30 | 30.00 | 170 | 210 | 45.0 L/min | ||||
| SAE A 2-Bolt Mounting Flange & Drive Shaft Details
| Interface Feature | Technical Standard & Dimension |
|---|---|
| Mounting Flange | SAE J744 SAE A 2-bolt oval mounting flange (heavy-duty ductile cast iron) |
| Centering Pilot | Ø82.55 mm (3.250 in) pilot diameter (-0.025 / -0.075 mm tolerance) with 6.35 mm (0.250 in) pilot depth |
| Bolt Hole Pitch & Pattern | 106.4 mm (4.189 in) bolt center distance with 2 × Ø11.1 mm (0.437 in) through mounting holes |
| Primary Drive Shaft Options | SAE A 9-tooth involute spline (16/32 DP, 30° pressure angle), SAE A 11-tooth involute spline, or cylindrical straight keyed shaft (Ø15.88 mm / 5/8 in or Ø19.05 mm / 3/4 in) |
| Intermediate Coupling Shaft | High-strength alloy steel internal spline through-drive coupling connecting Group 2 cast-iron and aluminium sections (allowable intermediate torque: 140 Nm) |
| Port Connections (Both Stages) | SAE straight thread O-ring boss (UNF) or British standard pipe parallel thread (BSPP G 1/2 and G 3/4 conforming to UNI-ISO 228); optional split flanged ports |
| 1:1 Direct-Fit OEM Brand Replacement Coverage
| Manufacturer Brand | Direct-Fit Drop-In Tandem Equivalent Series |
|---|---|
| CASAPPA | KAPPA + POLARIS Hybrid Dual Series (KP20 + PLP20 with SAE A 2-bolt flange) |
| Bosch Rexroth | AZPG + AZPF Group 2 Cast Iron + Aluminium multiple gear pumps (SAE A 2-bolt mounting) |
| MARZOCCHI | GHP2 + ALP2 SAE A 2-bolt modular tandem gear pumps (Cast Iron + Aluminium) |
| PARKER Hannifin | PGP511 Cast Iron + PGP511 Aluminium SAE A dual external gear pumps |
| DANFOSS / Turolla | Group 2 Heavy Cast Iron front + Group 2 Aluminium rear dual gear pumps (SAE A mounting) |
| SALAMI | 2PB (Cast Iron) + 2PE (Aluminium) dual gear pumps with SAE A 2-bolt pilot |
| Technical Performance Matrix Across Available Stages
| Primary Front Stage: Group 2 Cast Iron (2PT2F) | Secondary Rear Stage: Group 2 Aluminium (2PDF) | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Model Code | Displ. (cm³/rev) | p1 (bar) | p3 Peak (bar) | Max Speed (min⁻¹) | Model Code | Displ. (cm³/rev) | P1 (bar) | P3 Peak (bar) | Flow @ 1500 rpm |
| 2PT2F4 | 4.95 | 285 | 330 | 4000 | 2PDF4 | 4.00 | 250 | 300 | 6.0 L/min |
| 2PT2F6.3 | 6.61 | 285 | 330 | 4000 | 2PDF6 | 6.00 | 250 | 300 | 9.0 L/min |
| 2PT2F8 | 8.26 | 285 | 330 | 3500 | 2PDF8 | 8.50 | 250 | 300 | 12.8 L/min |
| 2PT2F11.2 | 11.23 | 275 | 320 | 3500 | 2PDF11 | 11.00 | 250 | 300 | 16.5 L/min |
| 2PT2F14 | 14.53 | 265 | 320 | 3500 | 2PDF14 | 14.00 | 250 | 300 | 21.0 L/min |
| 2PT2F16 | 16.85 | 260 | 320 | 3000 | 2PDF16 | 16.50 | 230 | 280 | 24.8 L/min |
| 2PT2F20 | 21.14 | 210 | 250 | 3000 | 2PDF19 | 19.50 | 210 | 260 | 29.3 L/min |
| 2PT2F25 | 26.42 | 180 | 220 | 2500 | 2PDF22 | 22.50 | 200 | 250 | 33.8 L/min |
| 2PT2F31.5 | 33.03 | 140 | 180 | 2000 | 2PDF26 | 26.00 | 180 | 230 | 39.0 L/min |
| - | 2PDF30 | 30.00 | 170 | 210 | 45.0 L/min | ||||
| Manufacturer Brand | Direct-Fit Drop-In Tandem Equivalent Series |
|---|---|
| CASAPPA | KAPPA + POLARIS Hybrid Dual Series (KP20 + PLP20 with SAE A 2-bolt flange) |
| Bosch Rexroth | AZPG + AZPF Group 2 Cast Iron + Aluminium multiple gear pumps (SAE A 2-bolt mounting) |
| MARZOCCHI | GHP2 + ALP2 SAE A 2-bolt modular tandem gear pumps (Cast Iron + Aluminium) |
| PARKER Hannifin | PGP511 Cast Iron + PGP511 Aluminium SAE A dual external gear pumps |
| DANFOSS / Turolla | Group 2 Heavy Cast Iron front + Group 2 Aluminium rear dual gear pumps (SAE A mounting) |
| SALAMI | 2PB (Cast Iron) + 2PE (Aluminium) dual gear pumps with SAE A 2-bolt pilot |
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