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

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

The HENGYUHANG 4PT4F+4PTF SAE B 2/4-Bolt Series is an ultra-heavy-duty dual Group 4 cast iron tandem external gear pump designed for high-flow, high-pressure dual-circuit mobile and industrial systems. Both the front through-drive pump stage (4PT4F) and the rear pump stage (4PTF) are cast from high-tensile spheroidal graphite ductile iron (QT500), providing superior fatigue strength, minimal bore expansion under cyclic loading, and continuous pressure ratings up to 275 bar with peak pressure capability reaching 315 bar (4,568 psi). An oversized, induction-hardened internal involute splined through-shaft coupling transmits maximum downstream driving torque without shaft deflection or thermal binding. Featuring a universal combination SAE B 2/4-bolt mounting flange (Centring pilot Ø 101.6 mm / 4.00" h8, 2-bolt diagonal spacing 146.0 mm / 5.75", 4-bolt rectangular pattern 89.7 × 114.3 mm / 3.53" × 4.50", Cover Code 00) and standard SAE splined or keyed drive shafts, this series offers complete 1:1 OEM drop-in interchangeability across 27+ international brands.

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

| Performance Data Across Displacements

Note: Reference test conditions: ISO VG 46 hydraulic mineral oil, T = 50 °C, ν = 30 mm²/s.

Front & Rear Stages — Group 4PT4F / 4PTF Cast Iron (Shared Group 4 Ratings)

Note: Both front and rear pump stages utilize the identical high-performance Group 4 cast iron displacement ratings. Combined total delivery flow exceeds 270 l/min at rated speeds. Maximum continuous operating parameters are subject to the total cumulative drive shaft torque rating.

| Operating Conditions & Fluid Compatibility

Advantages

Dual Group 4 Heavy-Duty Cast Iron Construction

Both stages are built with high-strength spheroidal graphite ductile iron (QT500), delivering maximum structural rigidity, outstanding fatigue resistance, and continuous high-pressure operation up to 275 bar with peak capability up to 315 bar (4,568 psi).

Universal SAE B Combination 2/4-Bolt Flange

Engineered with dual-mounting geometry (Cover Code 00) accommodating both 2-bolt oval and 4-bolt rectangular mounting pads (Pilot Ø101.6 mm / 4.00"), enabling seamless fleet standardization across diverse equipment.

High Flow Dual Independent Delivery

Combines two high-capacity Group 4 gear sets, delivering combined flow rates exceeding 270 l/min to independently power heavy hydraulic circuits without mutual flow interference.

Heavy-Duty Group 4 Through-Drive Splined Coupling

Equipped with an oversized, induction-hardened internal involute splined through-drive connection engineered to withstand heavy cumulative drive torque under continuous duty cycles.

High Volumetric Efficiency (>94%)

Precision-machined 12-tooth gear profiles and hydrostatically balanced floating thrust plates minimize internal leakage and maintain high volumetric efficiency across full temperature and pressure envelopes.

Superior Vibration & Acoustic Damping

High-density ductile iron dampens mechanical resonance and pressure ripples, delivering smooth and quiet hydraulic performance in heavy mobile cabs and indoor industrial plants.

Reference

Series Architecture & Displacements

• Series Nomenclature: HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 4PT4F+4PTF SAE B 2/4-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 Standard: SAE B Combination 2/4-Bolt universal mount (Cover Code 00, Pilot Ø101.6 mm / 4.00").

• Drive Shaft: SAE 13T spline (Code 01) or optional SAE 15T / keyed drive shafts.

• Intermediate Coupling: Dedicated heavy-duty Group 4 internal splined through-drive coupling.

Comprehensive Interchangeability & Replacement Matrix

The HENGYUHANG 4PT4F+4PTF SAE B 2/4-Bolt series provides 1:1 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 2/4-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 & Earthmoving: Main boom, arm, and swing circuits paired with high-flow auxiliary implement circuits on crawler excavators, large wheel loaders, and trenchers.

• Mining & Drilling Machinery: Rotary drilling rigs, continuous miners, underground haul trucks, and hydraulic breaker power circuits.

• Heavy Material Handling & Port Equipment: Mast lifting and high-demand hydraulic steering circuits for container reach stackers, heavy rough-terrain cranes, and counterbalance forklifts.

• Forestry & Timber Processing: Log loaders, heavy timber forwarders, debarkers, and tree harvesters requiring dual high-pressure continuous flow.

• Industrial Hydraulic Power Units (HPUs): Central hydraulic power stations, scrap metal compactors, high-tonnage hydraulic forging presses, and injection molding machinery.

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.