Tandem Cast Iron Hydraulic Gear Pump 3PT3F+3PTF SAE B 2/4-Bolt

Tandem Cast Iron Hydraulic Gear Pump 3PT3F+3PTF SAE B 2/4-Bolt Series

Hengyuhang Tandem Cast Iron Hydraulic Gear Pump 3PT3F+3PTF SAE B 2/4-Bolt Series integrates dual heavy-duty Group 3 ductile cast iron pumping stages with a versatile SAE B combination 2/4-bolt mount, delivering extreme fatigue endurance, dual high-flow circuits, and peak pressure capability up to 320 bar.

| Applications of Hengyuhang Tandem Cast Iron Hydraulic Gear Pump 3PT3F+3PTF SAE B 2/4-Bolt Series

Engineered for heavy construction machinery, high-tonnage mining vehicles, and severe-duty mobile industrial equipment, this dual cast iron tandem pump drives two independent high-flow hydraulic circuits from a single prime mover power take-off. It provides rugged, continuous fluid power for large crawler excavators, wheel loaders, heavy bulldozers, mining haul trucks, and high-pressure industrial power packs operating under continuous cyclic shock loads.

| Key Technical Specifications

| Overview of HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 3PT3F+3PTF SAE B 2/4-Bolt Series

The HENGYUHANG 3PT3F+3PTF SAE B 2/4-Bolt Series provides a heavy-duty all-cast-iron dual Group 3 fluid power solution designed to international SAE mounting standards. It couples a dedicated heavy-duty spheroidal graphite ductile cast-iron Group 3 front through-drive pump stage (3PT3F) with a matching Group 3 cast-iron rear pump stage (3PTF). Driven synchronously through an oversized, induction-hardened internal splined through-drive coupling, this assembly eliminates bulky split-drive gearboxes or complex electronic flow divider networks, delivering two distinct high-flow hydraulic circuits with completely independent operating pressures and flows.

Featuring a versatile SAE B combination 2/4-bolt mounting flange (centring pilot Ø 101.6 mm / 4.00 inches h8; 2-bolt diagonal hole spacing 146.0 mm / 5.75 inches; 4-bolt rectangular hole pattern 89.7 mm × 114.3 mm / 3.53 inches × 4.50 inches), the 3PT3F+3PTF series provides universal drop-in interchangeability on both 2-bolt and 4-bolt SAE B receiver pads. It directly replaces OEM tandem cast iron gear pumps across leading international manufacturers including CASAPPA (KP30 / KP35 / FDP30 / HDP30 / HDP35 / FP30 / FP40), PARKER / Commercial Hydraulics (PGP330 / PGP350 / PGP315 / PGP365 / PGP620 / PGP640 / P20), JIHOSTROJ (QHD0 / QHD1 / QHD2 / GHD0 / GHD1 / GHD2), DAVID BROWN, METARIS, PERMCO, and KOMATSU heavy equipment gear pumps. Both front and rear pump stages cover high displacements from 20.0 to 71.0 cm³/rev, allowing dual heavy work circuits—such as boom lift and swing drive, track propel and implement circuits, or auxiliary high-flow hydraulic motors—to operate simultaneously at continuous working pressures up to 280 bar (4,060 psi) and peak pressures up to 320 bar (4,640 psi).

Both gear housings, mounting flange, intermediate coupling adapter, and rear cover are cast from high-tensile spheroidal graphite ductile iron (QT500 / GGG50), delivering outstanding structural fatigue resistance, extreme pressure containment, and superior acoustic dampening under severe cyclic shock loads. Precision-ground, case-hardened alloy steel gears ride within heavy-duty composite DU/PTFE hydrodynamic sleeve bushings. Independently floating hydrostatic axial thrust balance plates on both pump sections 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 3PT3F+3PTF SAE B 2/4-Bolt Series

Interface data needed with the drawing:

| Pump Installation Specifications HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 3PT3F+3PTF SAE B 2/4-Bolt Series

The HENGYUHANG 3PT3F+3PTF SAE B 2/4-bolt flange tandem cast iron series utilizes an unambiguous modular model numbering system:

Code structure — reference: 3PT3F+3PTF-SAEB24 — Dual Group 3 Cast Iron SAE B 2/4-Bolt Tandem Gear Pump Series

| Reading your replacement code

| Techspecs of HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 3PT3F+3PTF SAE B 2/4-Bolt Series

| Performance Data Across Displacements

Note: Technical performance data below reflect nominal catalog ratings under ISO VG 46 mineral oil at 50 °C (122 °F). Actual operating pressures and flow rates should be verified against application duty cycle and final drawing.

Front Stage — Group 3PT3F (Cast Iron Heavy-Duty Through-Drive)

Rear Stage — Group 3PTF (Cast Iron Heavy-Duty)

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

Advantages — HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 3PT3F+3PTF SAE B 2/4-Bolt Series

Full Dual Cast Iron Structural Durability

Both front and rear pump bodies, intermediate adapter, and mounting flange are precision-cast from high-grade spheroidal graphite ductile cast iron (QT500), delivering superior fatigue endurance, extreme rigidity against barrel dilation, and peak operating pressures up to 320 bar (4,640 psi).

SAE B Combination 2/4-Bolt Flange Universal Fit

Machined to exact SAE B combination dimensions (pilot Ø 101.6 mm, 2-bolt diagonal spacing 146.0 mm, 4-bolt rectangular pattern 89.7 × 114.3 mm), enabling universal mounting across both 2-bolt and 4-bolt equipment receiver pads.

Dual Group 3 High-Flow Multi-Circuit Delivery

Combines two high-displacement Group 3 stages (each up to 71 cm³/rev) to power dual heavy-duty primary circuits—such as boom lift and travel drive—from a single prime mover power take-off, delivering combined flow exceeding 210 l/min.

Heavy-Duty Through-Drive Torque Transmission

Features an oversized, 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 Damping & Low Pressure Ripple

High-precision hobbed and shaved gear profiles combined with the dense acoustic dampening characteristics of dual cast iron bodies dramatically reduce operational noise across operator cabs and industrial workstations.

Reference — HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 3PT3F+3PTF SAE B 2/4-Bolt Series

Series Architecture Across Dual Group 3 Cast Iron Tandem Combinations

The modular 3PT3F+3PTF tandem architecture pairs 9 front cast iron displacements with 9 rear cast iron displacements, generating over 81 standardized displacement combinations:

• Heavy Cast Iron Primary Stage (Group 3PT3F): Displacements 20.0, 22.5, 26.0, 33.0, 38.0, 44.0, 52.0, 60.0, and 71.0 cm³/rev for high-pressure primary work circuits operating up to 320 bar peak pressure.

• Heavy Cast Iron Secondary Stage (Group 3PTF): Displacements 20.0, 22.5, 26.0, 33.0, 38.0, 44.0, 52.0, 60.0, and 71.0 cm³/rev for high-flow secondary work circuits, track propel drives, auxiliary boom functions, or heavy hydraulic motors.

Comprehensive Interchangeability Matrix Across Target Brands

The HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 3PT3F+3PTF SAE B 2/4-Bolt Series provides full mechanical, mounting, and hydraulic drop-in substitution for the following international hydraulic manufacturers and their designated pump families:

• CASAPPA: KP30, KP35, FDP30, HDP30, HDP35, FP30, FP40 series cast iron multi-section gear pumps.

• PARKER Hannifin (Commercial Hydraulics): PGP330, PGP350, PGP315, PGP365, PGP620, PGP640, P20 heavy-duty cast iron tandem external gear pumps.

• JIHOSTROJ: QHD0, QHD1, QHD2, GHD0, GHD1, GHD2 heavy-duty cast iron multi-section gear pumps.

• DAVID BROWN Hydraulics: 2000 series, 3000 series heavy-duty multi-section cast iron gear pumps.

• METARIS Hydraulics: MH330, MH350, MH365, MH315 series commercial interchange gear pumps.

• PERMCO: P3300, P3500, P3600, P3100 series heavy-duty cast iron external gear pumps.

• KOMATSU: Construction equipment OEM hydraulic gear pump replacements for excavators, wheel loaders, dozers, and motor graders.

Brand Replacement

Quanzhou Hengyuhang Power Technology Co., Ltd. manufactures the 3PT3F+3PTF SAE B 2/4-Bolt Tandem Cast Iron Gear Pump Series in strict alignment with SAE standardized mounting dimensions 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 (KP30 / KP35 / HDP30 / HDP35), PARKER (PGP330 / PGP350 / PGP620 / PGP640), JIHOSTROJ (QHD / GHD), DAVID BROWN, METARIS, PERMCO, and KOMATSU 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 3PT3F+3PTF SAE B 2/4-Bolt Series

• Mobile Construction Machinery: Large crawler excavators, heavy wheel loaders, backhoe loaders, bulldozers, and crawler cranes requiring high-pressure, high-flow dual-circuit implement hydraulics.

• Mining & Earthmoving Equipment: Articulated dump trucks, underground mining utility loaders, surface drill rigs, rock splitters, and tunnel muckers operating in hostile, abrasive environments.

• Agricultural & Harvesting Equipment: High-horsepower farm tractors, combine harvesters, forage harvesters, large round balers, and heavy sprayers requiring independent high-flow implement and steering/auxiliary drive loops.

• Material Handling & Aerial Equipment: Heavy container handlers, reach stackers, rough-terrain forklifts, and high-reach telescopic work platforms.

• Forestry & Timber Machinery: Forwarders, log skidders, feller bunchers, wood chippers, and heavy-duty tub grinders.

• Stationary Industrial Hydraulic Power Units (HPUs): High-tonnage hydraulic presses, metal scrap balers, shear balers, injection molding clamping units, and high-flow central industrial lubrication systems.

Package & Shipping

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 B combination 2/4-bolt flange, standard 13-tooth or 15-tooth involute splined shaft, and port centerline dimensions, Hengyuhang pumps provide 100% form, fit, and functional drop-in replacement for target 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, 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.