Tandem Cast Iron Hydraulic Gear Pump 4PT2F+2PDF SAE B 2-Bolt

| Overview of HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 4PT2F+2PDF SAE B 2-Bolt Series

The HENGYUHANG 4PT2F+2PDF SAE B 2-Bolt Series is an advanced cross-frame tandem external gear pump that combines a heavy-duty Group 4 cast iron front pump stage (4PT2F) with a versatile Group 2 rear pump stage (2PDF). The 4PT2F front stage is cast from premium spheroidal graphite ductile iron (QT500), providing exceptional mechanical fatigue strength, thermal stability, and pressure retention up to 315 bar (4,568 psi). It incorporates an induction-hardened internal through-shaft coupling mechanism that seamlessly drives the rear 2PDF stage without parasitic deflection. Featuring standardized SAE B 2-bolt oval mounting geometry (Centring pilot Ø 101.6 mm / 4.00" h8, hole center spacing 146.0 mm / 5.75", Cover Code 01/10) and standard SAE involute splined or cylindrical keyed drive shafts (Shaft Code 01/02/06), the 4PT2F+2PDF series enables dual hydraulic circuits from a single prime mover, optimizing installation space and delivering 1:1 OEM drop-in interchangeability across leading international hydraulic brands.

| Dimension of HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 4PT2F+2PDF SAE B 2-Bolt Series

| Interface Data Needed with the Drawing (Dimensional Reference Table)

| Pump Installation Specifications HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 4PT2F+2PDF SAE B 2-Bolt Series

| Comprehensive Ordering Code Breakdown (Hengyuhang 4PTF Catalogue Structure)

Code structure — reference: 4PTF−D1/D2−R−C−S−P1/P2−M−B

| Reading Your Replacement Code

| Techspecs of HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 4PT2F+2PDF SAE B 2-Bolt Series

| Performance Data Across Displacements

Note: Data based on official Hengyuhang 4PTF technical specifications: ISO VG 46 hydraulic mineral oil, T = 50 °C, ν = 30 mm²/s.

Front Stage — Group 4PT2F Cast Iron

Rear Stage — Group 2PDF

Note: Technical values represent nominal catalogue ratings. Final combined operating pressures and speed limits are determined by fluid operating temperature, circuit filtration, and cumulative input drive torque.

| Operating Conditions & Fluid Compatibility

Advantages

Cast Iron High-Pressure Fatigue Durability

The 4PT2F front stage is manufactured from spheroidal graphite ductile iron (QT500), delivering immense structural stiffness that resists cyclic fatigue, bore breathing, and pressure spikes up to 315 bar (4,568 psi).

SAE B 2-Bolt Standard Compatibility

Precision-machined to strict SAE J744 / ISO 3019-1 standards (Ø101.6 mm pilot, 146.0 mm hole spacing, Cover Code 01/10) with standard 13-tooth or 15-tooth involute splined shafts, ensuring effortless drop-in field replacement.

Dual-Circuit Independent Power Density

Enables a heavy-duty primary circuit (up to 138 l/min) and an independent auxiliary circuit (up to 45 l/min) driven from a single engine or motor take-off, eliminating extra gearboxes.

Heavy-Duty Through-Drive Splined Coupling

Equipped with a reinforced internal involute splined through-drive connection rated for full downstream hydraulic loads without angular deflection or premature fatigue.

Superior Volumetric Efficiency (>94%)

Utilizes micro-finished 12-tooth case-hardened alloy gears and precision hydrostatic thrust balance plates to ensure minimal internal slippage across high working pressures.

Ultra-Low Noise & Vibration Damping

High-density cast iron absorbs mechanical noise and fluid pulsation, operating significantly quieter than conventional aluminum gear pumps in demanding mobile environments.

Reference

Series Architecture & Displacements

• Series Nomenclature: HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 4PT2F+2PDF SAE B 2-Bolt Series

• Front Stage (Group 4PT2F Cast Iron): Displacements from 8.0 to 92.0 cm³/rev (18 standard displacement steps).

• Rear Stage (Group 2PDF): Displacements from 4.0 to 30.0 cm³/rev (12 displacement steps).

• Flange & Shaft Standard: SAE B 2-Bolt oval mount (Code 01/10) with SAE 13T spline (Code 01) or SAE keyed shafts.

• Through-Drive Coupling: Dedicated intermediate splined coupling connecting front and rear stages.

Comprehensive Interchangeability & Replacement Matrix

The HENGYUHANG 4PT2F+2PDF SAE B 2-Bolt series provides drop-in replacement compatibility across the following 27 international hydraulic pump manufacturers and designated series:

• MARZOCCHI: GHP2A, ALP2A, GHP2, ALP2, 1PD, GHP3, ALP3, GHP3A, ALP3A series

• DANFOSS: SNP1NN, SNP3NN, SNW3NN, SNP2, SNW2 series

• HYDAC: PGE102, PGE103, PGE104 series

• ARGO-HYTOS: GP2, GP3, GP1 series

• ATOS: PFG series

• Brevini (Dana Brevini): OT100, OT200, OT300 series

• BUCHER Hydraulics: AP100, AP200, AP212, AP300 series

• BONDIOLI & PAVESI: HPLPA1, HPLPA2, HPLPA3 series

• Boden: BAP1, BHP1, BAP2, BHP2, BHP3, BAP3 series

• Caproni: 10A, 20A, 30A, 10C, 20C, 30C series

• CASAPPA: KP20, PHP20, Polaris 20, PLP30, KP30, KP35, HDP30, HDP35 series

• CONCENTRIC: WP300, WP900, WP1500 series

• DUPLOMATIC: 1P, GP2, GP3, GP1 series

• Galtech: 1SPA, 2SPA, 3GPG, 3SPA series

• GRH: 1PF, 2PF, 3PF series

• HANSA-TMP: 1SP, 2SP, 3GPG, 3SPA series

• HESPER: HA11, HA2, HA3, CHP1 series

• HONOR: 1KH series

• HPI: P1BAN1, P1BAN2, P1AAN2, P1BAN3, P1AAN3 series

• HYDRONIT: E series

• JIHOSTROJ: P23, J, T3, Q2, UD, QHD1, QHD2 series

• PARKER (Commercial Hydraulics / Parker): PGP511, PGP517, PGP620, PGP640 series

• Bosch Rexroth: AZPF, AZPG, AZPN, AZPT series

• RONZIO: 02ZAG, 02ZCG, 02ZLG, 03ZBG, 03ZAG series

• ROQUET: 1L0, PLA, GZ, G, GLA, PLC, PNA, PLJ, PLK, PLH, PLZ series

• SDH: CBN, CBT, CBF series

• VIVOLO (Vivoil): X1P, XV-1P, X2P, X3P, XV-2P, XV-3P series

Brand Replacement

The HENGYUHANG 4PT2F+2PDF SAE B 2-Bolt series is precision-engineered to serve as a reliable, direct replacement for major global brands including CASAPPA, Bosch Rexroth, Parker, Marzocchi, Danfoss, Jihostroj, and Bondioli & Pavesi. Every pump undergoes 100% factory dynamic testing across its full speed and pressure curve to guarantee volumetric efficiency, continuous pressure integrity up to 315 bar, and minimal internal bypass. Utilizing strict SAE-standard pilot centering (Ø101.6 mm / 4.00") and standardized 13-tooth involute splined shaft geometries, Hengyuhang pumps allow equipment builders and maintenance engineers to perform drop-in field retrofits without pipe rework, adapter plates, or system modifications. Custom displacement pairings, shared or separate suction ports, and specialized shaft extensions are fully supported with rapid turnaround.

Applications

• Heavy Mobile Construction Equipment: Primary boom/bucket circuit and auxiliary pilot steering/cooling circuits on crawler excavators, backhoe loaders, wheel loaders, and trenchers.

• Agricultural Machinery: Main hitch lifting and auxiliary steering/hydraulic motor drives on heavy tractors, combine harvesters, and forage harvesters.

• Material Handling & Lifting: Mast elevation and power steering circuits for heavy counterbalance forklifts, telehandlers, container reach stackers, and rough-terrain cranes.

• Forestry & Municipal Vehicles: Feller bunchers, timber forwarders, road sweepers, refuse compactor trucks, and municipal snowplows.

• Industrial Hydraulic Power Units (HPUs): Dual-pressure central hydraulic systems, plastic injection molding auxiliary circuits, scrap metal balers, and hydraulic press accumulator charging.

Package & Shipping

Why Choose Hengyuhang?

• Direct Factory Precision Manufacturing & CNC Excellence: Manufactured in our state-of-the-art production facility equipped with high-precision 4-axis and 5-axis CNC machining centers, automated gear hobbing, and CNC gear tooth profile grinding (Ra < 0.2 μm) to ensure superior surface finish, ultra-tight internal clearances, and maximum volumetric efficiency.

• 100% Full-Cycle Multi-Parameter Factory Inspection: Every single pump undergoes computerized testing before packaging, verifying flow rate at rated speed, volumetric efficiency (>94%), mechanical efficiency, continuous and peak pressure hold, internal bypass, and noise spectrum. Zero untested units leave the factory.

• Seamless 1:1 OEM Drop-In Interchangeability: Dimensionally matched to European, SAE, and DIN standards, providing 1:1 direct mechanical interchangeability across 27+ international brands (Casappa, Rexroth, Marzocchi, Parker, Danfoss, Jihostroj, etc.) with zero mounting modifications required.

• Flexible Engineering Customization & Rapid Prototyping: Supported by a senior fluid power engineering team, offering custom displacement combinations, specialized shaft tapers, splines, integrated priority or relief valves, and non-standard port orientations with rapid sample prototyping and low MOQ requirements.

• Robust Supply Chain, Extensive Inventory & Fast Global Dispatch: Extensive raw material stock of high-grade spheroidal graphite ductile iron castings, precision gear sets, and bearing assemblies enables rapid assembly and 48–72 hour dispatch for emergency breakdown replacements, supported by complete export logistics.

• 12-Month Comprehensive Warranty & Lifetime Technical Support: All pumps are backed by a comprehensive 12-month manufacturer warranty against defects in materials and workmanship, supplemented by 24/7 engineering consultation, CAD drawing verification, and lifecycle technical assistance.