Gear pump
Tandem Cast Iron Hydraulic Gear Pump 2PT2F+2PTF SAE A 2-Bolt
Hengyuhang Tandem Cast Iron Hydraulic Gear Pump 2PT2F+2PTF SAE A 2-Bolt Series integrates dual high-strength ductile cast iron Group 2 pumping stages into a compact SAE A 2-bolt mount, delivering extreme pressure containment, multi-circuit continuous flow, and peak pressure capability up to 350 bar.
| Applications of Hengyuhang Tandem Cast Iron Hydraulic Gear Pump 2PT2F+2PTF SAE A 2-Bolt Series
Engineered for severe-duty mobile machinery and high-pressure industrial power packs, this all-cast-iron dual-stage tandem pump powers dual high-pressure hydraulic circuits from a single prime mover drive pad. It provides rugged, continuous fluid power for compact wheel loaders, mini-excavators, agricultural sprayers, skid-steer attachments, hydrostatic steering loops, and industrial compaction machinery operating under severe cyclic shock loads.
| Key Technical Specifications
Product Model: Hengyuhang Tandem Cast Iron Hydraulic Gear Pump 2PT2F+2PTF 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 2PTF Cast Iron): 4 to 33 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+2PTF SAE A 2-Bolt Series
The HENGYUHANG 2PT2F+2PTF SAE A 2-Bolt Series delivers an all-cast-iron, high-pressure dual-circuit fluid power package. Featuring full spheroidal graphite ductile iron (QT500 / GGG50) construction across both the primary front stage (2PT2F) and the secondary rear stage (2PTF), this tandem assembly is built to withstand extreme cyclic pressure spikes, continuous high working pressures, and severe external mechanical loads that exceed the fatigue limits of standard aluminum gear pumps.
Driven by a single input drive shaft through an induction-hardened, high-torque splined through-drive coupling, the 2PT2F+2PTF tandem configuration powers two completely segregated hydraulic circuits without requiring secondary PTO gearboxes, auxiliary belt drives, or dual prime movers. Featuring an industry-standard SAE A 2-bolt oval mounting flange (pilot Ø 82.55 mm / 3.25 inches, bolt hole center spacing 106.4 mm / 4.19 inches), this series provides 100% direct drop-in interchangeability with OEM tandem cast-iron pumps across 27 global hydraulic manufacturers, including CASAPPA (KP20 / PHP20 series), Bosch Rexroth, MARZOCCHI, PARKER, and DANFOSS.
Both the front and rear pump stages span displacements from 4.0 to 33.0 cm³/rev, enabling custom flow matching for simultaneous heavy work functions such as main implement hydraulics paired with high-pressure hydrostatic steering, priority fan drive motors, or auxiliary hydraulic attachments. Both pumping stages sustain continuous working pressures up to 280–300 bar (4,060–4,350 psi) and intermittent peak pressures up to 350 bar (5,076 psi). The solid ductile cast-iron bodies exhibit high structural stiffness, eliminating housing barrel dilation and maintaining micron-level gear mesh clearances under peak pressure shocks. High-load composite DU/PTFE hydrodynamic sleeve bushings and independently floating hydrostatic axial balance plates guarantee sustained volumetric efficiencies exceeding 94% while dramatically dampening pressure ripples and operational noise.
| Dimension of HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 2PT2F+2PTF 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 through-drive sleeve coupling rated to transfer full continuous working torque from the front 2PT2F section to the rear 2PTF section without backlash |
| 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 2PTF cast-iron suction ports) / Common merged high-flow 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 (2PTF 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 |
| 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 (QT500) for front mounting flange, front gear body, intermediate through-drive connection bracket, rear gear 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 2PTF section: 65 ± 5 Nm |
| Pump Installation Specifications HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 2PT2F+2PTF SAE A 2-Bolt Series
The HENGYUHANG 2PT2F+2PTF dual cast-iron tandem series utilizes an unambiguous modular model numbering system:
Code structure — reference: 2PT2F+2PTF-SAEA2 — Dual Cast Iron Group 2 SAE A 2-Bolt Tandem Gear Pump Series
| Segment | Meaning | Standard Options & Features |
|---|---|---|
| Series Code | 2PT2F+2PTF | Dual cast-iron modular tandem gear pump: Group 2PT2F front through-drive stage + Group 2PTF rear stage |
| Front Displacement | 04 to 33 | Group 2PT2F cast iron front 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 33 | Group 2PTF cast iron 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, 33.0) |
| 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+2PTF Equivalent | Interchange Verification Notes |
|---|---|---|
| CASAPPA KP20 / PHP20 + KP20 / PHP20 (SAE A 2-Bolt) | HENGYUHANG 2PT2F+2PTF Series | 100% direct drop-in; identical SAE A pilot Ø 82.55 mm, 9T/11T splined shaft, dual cast-iron bodies, and displacement match |
| Bosch Rexroth AZPF + AZPF Cast Iron Tandem (SAE A) | HENGYUHANG 2PT2F+2PTF Series | Seamless mechanical envelope, shaft spline fit, and heavy-duty 350 bar peak pressure capability |
| MARZOCCHI GHP2A + GHP2A Tandem (SAE A) | HENGYUHANG 2PT2F+2PTF Series | Exact match on SAE A flange spigot, port drilling centers, cast-iron body stiffness, and through-drive torque |
| PARKER PGP511 + PGP511 Cast Iron Tandem | HENGYUHANG 2PT2F+2PTF Series | Complete bolt-hole, shaft spline, and high-pressure hydraulic replacement for heavy mobile machinery |
| DANFOSS SNP2NN + SNP2NN Tandem (Heavy Duty) | HENGYUHANG 2PT2F+2PTF Series | Direct drop-in fit for multi-function agricultural machinery, compact loaders, and boom lifts |
| BUCHER Hydraulics AP200 + AP200 Tandem | HENGYUHANG 2PT2F+2PTF Series | Direct drop-in fit for industrial power packs, drilling rigs, and compact material handling equipment |
| Galtech 2SPA + 2SPA Tandem (SAE Mount) | HENGYUHANG 2PT2F+2PTF Series | Identical mounting pilot, through-shaft torque distribution, and port centerline dimensions |
| VIVOLO (Vivoil) X2P + X2P / XV-2P + XV-2P Tandem | HENGYUHANG 2PT2F+2PTF 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+2PTF 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 2PTF (Cast Iron Heavy-Duty Standard)
| 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) |
|---|---|---|---|---|---|---|---|---|
| 2PTF-04 | 4.0 | 0.244 | 280 / 4,060 | 310 / 4,495 | 350 / 5,076 | 700 | 4,000 | 6.00 |
| 2PTF-06 | 6.0 | 0.366 | 280 / 4,060 | 310 / 4,495 | 350 / 5,076 | 700 | 4,000 | 9.00 |
| 2PTF-08 | 8.5 | 0.518 | 280 / 4,060 | 310 / 4,495 | 350 / 5,076 | 700 | 3,800 | 12.75 |
| 2PTF-11 | 11.0 | 0.671 | 280 / 4,060 | 310 / 4,495 | 350 / 5,076 | 600 | 3,800 | 16.50 |
| 2PTF-14 | 14.0 | 0.854 | 280 / 4,060 | 310 / 4,495 | 350 / 5,076 | 600 | 3,500 | 21.00 |
| 2PTF-16 | 16.5 | 1.006 | 260 / 3,770 | 290 / 4,205 | 320 / 4,640 | 600 | 3,500 | 24.75 |
| 2PTF-19 | 19.5 | 1.189 | 240 / 3,480 | 270 / 3,915 | 300 / 4,350 | 500 | 3,200 | 29.25 |
| 2PTF-22 | 22.5 | 1.372 | 220 / 3,190 | 250 / 3,625 | 280 / 4,060 | 500 | 3,000 | 33.75 |
| 2PTF-26 | 26.0 | 1.586 | 200 / 2,900 | 230 / 3,335 | 260 / 3,770 | 500 | 3,000 | 39.00 |
| 2PTF-30 | 30.0 | 1.830 | 180 / 2,610 | 210 / 3,045 | 240 / 3,480 | 500 | 2,800 | 45.00 |
| 2PTF-33 | 33.0 | 2.013 | 170 / 2,465 | 200 / 2,900 | 230 / 3,335 | 500 | 2,600 | 49.50 |
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+2PTF SAE A 2-Bolt Series
Full Dual Ductile Cast Iron Construction
Both front and rear pump casings and mounting covers are precision-cast from spheroidal graphite ductile cast iron (QT500), providing superior fatigue resistance, rigid structural containment, and peak operating pressures up to 350 bar (5,076 psi) across both circuits.
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 Dual-Stage Delivery
Compact two-stage tandem envelope allows two severe-duty work circuits (up to 33 + 33 cm³/rev) to be powered from a single prime mover power take-off, eliminating dual PTO drives.
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.
Superior Acoustic & Vibration Damping
High-precision hobbed and shaved gear profiles combined with the dense damping characteristics of cast iron dramatically reduce airborne noise and structural vibration across machine operator cabs and industrial workstations.
Reference — HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 2PT2F+2PTF SAE A 2-Bolt Series
Series Architecture Across Dual Group 2PT2F + Group 2PTF Tandem Combinations
The modular 2PT2F+2PTF tandem architecture pairs 11 front cast iron displacements with 11 rear cast iron displacements, generating over 120 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.
Heavy Cast Iron Secondary Stage (Group 2PTF): 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 independent high-pressure secondary work circuits, steering valves, fan motors, and auxiliary implements.
Comprehensive Interchangeability Matrix Across 27 Brands
The HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 2PT2F+2PTF 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+2PTF SAE A 2-Bolt Dual Cast Iron Tandem 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+2PTF SAE A 2-Bolt Series
Severe-Duty Mobile Construction Machinery: Mini-excavators, compact wheel loaders, skid-steer loaders, backhoes, and compact trenchers requiring dual high-pressure circuits for boom/bucket hydraulics paired with independent hydrostatic power steering or pilot controls.
Agricultural & Harvesting Equipment: High-demand 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, heavy electric/diesel scissor lifts, articulating boom lifts, and truck-mounted tailgate lifts requiring segregated main hoist and auxiliary steering circuits.
Forestry & Lawn Maintenance Machinery: Heavy commercial log splitters, wood chippers, commercial zero-turn mowers, and stump grinders.
Stationary Industrial Hydraulic Power Units (HPUs): High-pressure hydraulic presses, scrap metal 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 | 10.20 to 16.50 kg (22.49 to 36.38 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+2PTF SAE A 2-Bolt Series (4.95~33.03 + 4.95~33.03 cm³/rev) is an extreme-duty, all-cast-iron dual-stage external gear pump engineered to deliver maximum structural rigidity, high continuous operating pressures, and dual independent circuit fluid power 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 with 106.4 mm / 4.189 in bolt center distance), this multi-section unit integrates two Group 2 heavy-duty ductile cast-iron pumps—a front primary pump (2PT2F) and a rear secondary pump (2PTF)—coupled via a high-strength internal spline through-drive intermediate shaft. Both stages are constructed entirely from high-density spheroidal graphite ductile cast iron (front mounting flange, front gear casing, intermediate tandem adapter plate, rear gear casing, and rear end-cover), completely eliminating the housing barrel dilation, bolt stretch, and pressure-spike fatigue common in aluminium gear pumps. Offering 9 standardized displacements for each section (4.95, 6.61, 8.26, 11.23, 14.53, 16.85, 21.14, 26.42, and 33.03 cm³/rev), the tandem pump provides combined displacement capacities from 9.90 up to 66.06 cm³/rev. Both stages sustain continuous working pressures (p1) up to 285 bar (4,133 psi), intermittent pressures (p2) up to 300 bar (4,350 psi), and transient peak shock pressures (p3) up to 330 bar (4,785 psi). Featuring case-hardened alloy steel precision gears and hydrostatic axial pressure-balanced DU composite sleeve bushings, this series maintains over 94% volumetric efficiency and serves as a direct 1:1 drop-in replacement for CASAPPA KAPPA (KP20+KP20), Bosch Rexroth (AZPG+AZPG), Marzocchi (GHP2+GHP2), and Parker PGP511 dual cast-iron gear pumps.
| Applications
The 2PT2F+2PTF all-cast-iron SAE A 2-bolt tandem hydraulic gear pump series is specifically developed for severe continuous duty, extreme ambient temperatures, and harsh mobile or industrial environments where both hydraulic circuits are subjected to heavy cyclic pressure shocks and high working loads from a single engine PTO or electric motor drive:
Skid Steer & Compact Track Loaders: Both high-pressure cast-iron stages withstand severe cyclic pressure spikes when powering high-flow hydraulic attachments (cold planers, trenchers, rock wheels) on the front stage, while the rear stage reliably powers hydrostatic drive boost, auxiliary steering, and arm lift/tilt circuits.
Agricultural Tractors & Harvesters: The primary cast-iron pump handles heavy front-end loader cylinders and high-pressure implement circuits, while the secondary cast-iron pump powers independent hydrostatic power steering, priority braking circuits, and rear three-point hitches without cross-circuit pressure drops.
Compact Wheel Loaders & Mini Excavators: Delivers reliable dual-flow hydraulic power for boom/bucket main cylinders on the primary stage and auxiliary attachment/swing drive circuits on the secondary stage under continuous heavy digging resistance.
Rough-Terrain Forklifts & Telehandlers: The rugged front cast-iron stage powers high-tonnage mast lifting cylinders, while the rear cast-iron stage supplies smooth, high-pressure fluid for carriage side-shift, fork positioning, and steering under high duty cycles.
Dual-Speed High-Pressure Hydraulic Presses: Serves as an all-cast-iron high-low pump combination where both stages join for rapid closing speeds, after which the circuit unloads one stage while the second cast-iron stage sustains extreme holding pressures up to 285 bar without risk of housing deflection.
Municipal Refuse Trucks & Heavy Compactor Equipment: Withstands abrasive continuous operation and thermal expansion during refuse packing blade compaction, container hoist lifting, and municipal snowplow wing angle adjustments.
| Key Specifications Overview
| Parameter | Specification |
|---|---|
| Series Architecture | All-Cast-Iron Heavy-Duty Dual-Stage External Gear Pump (Group 2 Front 2PT2F + Group 2 Rear 2PTF) |
| 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 (2PTF) | 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) |
| Total Combined Displacement Range | 9.90 ~ 66.06 cm³/rev (modular independent stage pairing: V1 + V2) |
| Continuous Operating Pressure (p1) | 140 ~ 285 bar (2,030 ~ 4,133 psi) — 285 bar for 4.95~8.26 cc; 275 bar for 11.23 cc; 265 bar for 14.53 cc; 260 bar for 16.85 cc; 210 bar for 21.14 cc; 180 bar for 26.42 cc; 140 bar for 33.03 cc |
| Intermittent Operating Pressure (p2) | 160 ~ 300 bar (2,320 ~ 4,350 psi) — 300 bar for 4.95~8.26 cc; 290 bar for 11.23~16.85 cc; 230 bar for 21.14 cc; 200 bar for 26.42 cc; 160 bar for 33.03 cc |
| Max. Peak Pressure (p3) | 180 ~ 330 bar (2,610 ~ 4,785 psi) — 330 bar for 4.95~8.26 cc; 320 bar for 11.23~16.85 cc; 250 bar for 21.14 cc; 220 bar for 26.42 cc; 180 bar for 33.03 cc |
| Rotational Speed Range | Min. speed: 300 ~ 350 min⁻¹; Max. speed: 2000 ~ 4000 min⁻¹ (displacement dependent; up to 4000 min⁻¹ for 4.95 and 6.61 cc) |
| Volumetric Efficiency | ≥ 94% across rated operating pressure and thermal range |
| Hydro-Mechanical Efficiency | ≥ 89% ~ 92% |
| Body & Housing Construction | 100% all-cast-iron construction: spheroidal graphite ductile cast-iron front mounting flange, gear casings, intermediate adapter plate, and rear cover |
| 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, 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 Mechanism | High-tensile alloy steel internal spline through-drive coupling connecting Group 2 cast-iron stages (allowable intermediate torque: up to 140 Nm) |
| Hydraulic Port Connections | Independent ports: SAE straight thread O-ring boss (UNF) or British standard pipe parallel thread (BSPP G 1/2 and G 3/4 to UNI-ISO 228); 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 range: 20 ~ 80 mm²/s (cSt) |
| Operating Temperature Range | -25°C to +80°C (standard NBR seals); -15°C to +110°C (optional Viton FKM seals) |
| Assembly Tightening Torques | Flange mounting bolts: 70 ± 5 Nm; Body tie-rod clamp bolts: 70 ± 7 Nm (558 ÷ 682 lbf in) |
| Technical Performance Matrix Across Available Group 2 Cast Iron Stages
| Stage Model Code | Displacement cm³/rev (in³/rev) | Operating Pressure (bar / psi) | Speed Range (min⁻¹) | Flow @ 1500 rpm (L/min) | |||
|---|---|---|---|---|---|---|---|
| Continuous (p1) | Intermittent (p2) | Peak (p3) | Min. Speed | Max. Speed | |||
| 2PT2F-4 / 2PTF-4 | 4.95 (0.30) | 285 / 4,133 | 300 / 4,350 | 330 / 4,785 | 350 | 4000 | 7.43 |
| 2PT2F-6.3 / 2PTF-6.3 | 6.61 (0.40) | 285 / 4,133 | 300 / 4,350 | 330 / 4,785 | 350 | 4000 | 9.92 |
| 2PT2F-8 / 2PTF-8 | 8.26 (0.50) | 285 / 4,133 | 300 / 4,350 | 330 / 4,785 | 350 | 3500 | 12.39 |
| 2PT2F-11.2 / 2PTF-11.2 | 11.23 (0.69) | 275 / 3,988 | 290 / 4,205 | 320 / 4,640 | 350 | 3500 | 16.85 |
| 2PT2F-14 / 2PTF-14 | 14.53 (0.89) | 265 / 3,843 | 290 / 4,205 | 320 / 4,640 | 350 | 3500 | 21.80 |
| 2PT2F-16 / 2PTF-16 | 16.85 (1.03) | 260 / 3,770 | 290 / 4,205 | 320 / 4,640 | 300 | 3000 | 25.28 |
| 2PT2F-20 / 2PTF-20 | 21.14 (1.29) | 210 / 3,045 | 230 / 3,335 | 250 / 3,625 | 300 | 3000 | 31.71 |
| 2PT2F-25 / 2PTF-25 | 26.42 (1.61) | 180 / 2,610 | 200 / 2,900 | 220 / 3,190 | 300 | 2500 | 39.63 |
| 2PT2F-31.5 / 2PTF-31.5 | 33.03 (2.01) | 140 / 2,030 | 160 / 2,320 | 180 / 2,610 | 300 | 2000 | 49.55 |
| SAE A 2-Bolt Mounting Flange, Shaft & Port 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 | Heavy-duty alloy steel internal spline through-drive coupling connecting Group 2 cast-iron stages (allowable intermediate torque: up to 140 Nm) |
| Port Connections (Both Stages) | SAE straight thread O-ring boss (UNF: 7/8-14 UN / 1-1/16-12 UN) or British standard pipe parallel thread (BSPP: G 1/2 for 4.95~14.53 cc, G 3/4 for 16.85~33.03 cc conforming to UNI-ISO 228) |
| 1:1 Direct-Fit OEM Brand Replacement Coverage
| Manufacturer Brand | Direct-Fit Drop-In Tandem Equivalent Series |
|---|---|
| CASAPPA | KAPPA Dual Cast Iron Series (KP20 + KP20 with SAE A 2-bolt flange) |
| Bosch Rexroth | AZPG + AZPG Group 2 All-Cast-Iron multiple gear pumps (SAE A 2-bolt mounting) |
| MARZOCCHI | GHP2 + GHP2 SAE A 2-bolt cast iron modular tandem gear pumps |
| PARKER Hannifin | PGP511 Cast Iron + PGP511 Cast Iron SAE A dual external gear pumps |
| DANFOSS / Turolla | Group 2 Heavy Cast Iron dual external gear pumps (SAE A mounting) |
| SALAMI | 2PB + 2PB All-Cast-Iron dual gear pumps with SAE A 2-bolt pilot |
| BUCHER Hydraulics | QX2 + QX2 / AP212 + AP212 Cast Iron double gear pump assemblies |
| Technical Performance Matrix Across Available Group 2 Cast Iron Stages
| Stage Model Code | Displacement cm³/rev (in³/rev) | Operating Pressure (bar / psi) | Speed Range (min⁻¹) | Flow @ 1500 rpm (L/min) | |||
|---|---|---|---|---|---|---|---|
| Continuous (p1) | Intermittent (p2) | Peak (p3) | Min. Speed | Max. Speed | |||
| 2PT2F-4 / 2PTF-4 | 4.95 (0.30) | 285 / 4,133 | 300 / 4,350 | 330 / 4,785 | 350 | 4000 | 7.43 |
| 2PT2F-6.3 / 2PTF-6.3 | 6.61 (0.40) | 285 / 4,133 | 300 / 4,350 | 330 / 4,785 | 350 | 4000 | 9.92 |
| 2PT2F-8 / 2PTF-8 | 8.26 (0.50) | 285 / 4,133 | 300 / 4,350 | 330 / 4,785 | 350 | 3500 | 12.39 |
| 2PT2F-11.2 / 2PTF-11.2 | 11.23 (0.69) | 275 / 3,988 | 290 / 4,205 | 320 / 4,640 | 350 | 3500 | 16.85 |
| 2PT2F-14 / 2PTF-14 | 14.53 (0.89) | 265 / 3,843 | 290 / 4,205 | 320 / 4,640 | 350 | 3500 | 21.80 |
| 2PT2F-16 / 2PTF-16 | 16.85 (1.03) | 260 / 3,770 | 290 / 4,205 | 320 / 4,640 | 300 | 3000 | 25.28 |
| 2PT2F-20 / 2PTF-20 | 21.14 (1.29) | 210 / 3,045 | 230 / 3,335 | 250 / 3,625 | 300 | 3000 | 31.71 |
| 2PT2F-25 / 2PTF-25 | 26.42 (1.61) | 180 / 2,610 | 200 / 2,900 | 220 / 3,190 | 300 | 2500 | 39.63 |
| 2PT2F-31.5 / 2PTF-31.5 | 33.03 (2.01) | 140 / 2,030 | 160 / 2,320 | 180 / 2,610 | 300 | 2000 | 49.55 |
| Manufacturer Brand | Direct-Fit Drop-In Tandem Equivalent Series |
|---|---|
| CASAPPA | KAPPA Dual Cast Iron Series (KP20 + KP20 with SAE A 2-bolt flange) |
| Bosch Rexroth | AZPG + AZPG Group 2 All-Cast-Iron multiple gear pumps (SAE A 2-bolt mounting) |
| MARZOCCHI | GHP2 + GHP2 SAE A 2-bolt cast iron modular tandem gear pumps |
| PARKER Hannifin | PGP511 Cast Iron + PGP511 Cast Iron SAE A dual external gear pumps |
| DANFOSS / Turolla | Group 2 Heavy Cast Iron dual external gear pumps (SAE A mounting) |
| SALAMI | 2PB + 2PB All-Cast-Iron dual gear pumps with SAE A 2-bolt pilot |
| BUCHER Hydraulics | QX2 + QX2 / AP212 + AP212 Cast Iron double gear pump assemblies |
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