Tandem Cast Iron Hydraulic Gear Pump 4PT4F+4PTF SAE B 2-Bolt

| Overview of HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 4PT4F+4PTF SAE B 2-Bolt Series

The HENGYUHANG 4PT4F+4PTF SAE B 2-Bolt Series is a full ductile cast iron heavy-duty tandem external gear pump comprising a dedicated 4PT4F through-drive front stage and a 4PTF rear stage. Both pump bodies, front mounting flange, intermediate through-drive adapter, and rear end-cover are precision-cast from high-grade spheroidal graphite ductile iron (QT500), delivering supreme mechanical fatigue resistance, bore stability, and pressure containment up to 315 bar (4,568 psi). Featuring a dedicated high-capacity internal involute splined through-drive connection, the front 4PT4F stage is specifically engineered to transmit the full cumulative input drive torque required to operate two high-displacement Group 4 pumps simultaneously under maximum system pressures. Configured with standard SAE B 2-bolt oval mounting dimensions (Pilot Ø 101.6 mm / 4.00" h8, bolt hole center distance 146.0 mm / 5.75", Cover Code 01/10) and standard SAE splined or keyed drive shafts (Shaft Code 01/02/06), this dual-stage pump delivers dual independent or combined high-flow hydraulic circuits, providing 1:1 OEM drop-in interchangeability across 27+ international brands.

| Dimension of HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 4PT4F+4PTF SAE B 2-Bolt Series

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

| Pump Installation Specifications HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 4PT4F+4PTF 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 4PT4F+4PTF 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.

4PT4F Front Stage & 4PTF Rear Stage (Shared Group 4 Cast Iron Ratings)

Note: Technical values represent nominal catalogue ratings for individual stages. Combined dual-stage output flow can exceed 270 l/min at rated speed. Actual operating parameters depend on circuit temperature, filtration quality, and cumulative input drive torque capacity.

| Operating Conditions & Fluid Compatibility

Advantages

Dedicated Dual Group 4 Full Cast Iron Architecture

Both 4PT4F and 4PTF stages are precision-cast from high-grade spheroidal graphite ductile iron, delivering immense fatigue endurance, structural rigidity, and burst resistance up to 315 bar (4,568 psi).

SAE B 2-Bolt Standard Interchangeability

Manufactured to exact SAE J744 / ISO 3019-1 mounting dimensions (Ø101.6 mm pilot, 146.0 mm hole spacing, Cover Code 01/10) with standard 13T/15T splines or straight keyed shafts for effortless drop-in field retrofits.

Dual High-Flow High-Pressure Power Delivery

Provides two independent high-flow hydraulic circuits (each up to 138 l/min), enabling simultaneous operation of major working actuators and heavy steering/cooling systems from a single prime mover.

Reinforced High-Torque Through-Drive

Incorporates an induction-hardened internal involute splined through-shaft coupling engineered specifically to transmit the full cumulative drive torque of two high-displacement Group 4 stages without angular backlash.

High Volumetric Efficiency (>94%)

Micro-finished high-precision gear pairs and hydrostatically balanced floating pressure plates eliminate internal leakage and maintain consistent volumetric efficiency across high continuous pressures.

Exceptional Noise Damping & Pulsation Suppression

Heavy ductile iron bodies absorb hydraulic harmonics and gear-mesh vibrations, delivering whisper-quiet fluid power in mobile machine operator environments.

Reference

Series Architecture & Displacements

• Series Nomenclature: HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 4PT4F+4PTF SAE B 2-Bolt Series

• Front Stage (Group 4PT4F Cast Iron): Displacements from 8.0 to 92.0 cm³/rev (18 standard displacement steps).

• Rear Stage (Group 4PTF Cast Iron): Displacements from 8.0 to 92.0 cm³/rev (18 standard 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 4PT4F+4PTF 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 4PT4F+4PTF 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.