Tandem Cast Iron Hydraulic Gear Pump 6PT6F+6PTF SAE C 2/4-Bolt Series

| Overview of HENGYUHANG 6PT6F+6PTF SAE C 2/4-Bolt Series

The HENGYUHANG 6PT6F+6PTF SAE C 2/4-Bolt Series is an ultra-heavy-duty dual Group 6 tandem external gear pump engineered for severe mobile machinery and industrial hydraulic installations requiring two massive-flow, high-pressure independent hydraulic circuits. Both front (6PT6F) and rear (6PTF) stages are manufactured from high-tensile spheroidal graphite ductile cast iron, delivering exceptional fatigue resistance, cavitation resilience, and zero casing dilation under continuous operating pressures up to 280 bar and peak impulse pressures reaching 350 bar (5,076 psi). The front 6PT6F stage incorporates a massive heavy-duty through-drive shaft with an internal involute splined coupling, transferring full mechanical drive torque to the rear 6PTF pump without parasitic journal deflection or torsional vibration. Equipped with a precision-machined SAE C combination 2/4-bolt universal mounting flange (Centring pilot Ø 127.0 mm / 5.00" h8 with 181.0 mm diagonal 2-bolt spacing and 114.5 mm × 114.5 mm 4-bolt square pattern) and standardized SAE 14T splined or 1-1/4" keyed drive shafts, this series offers 1:1 OEM drop-in interchangeability across premier global manufacturers including Casappa, Parker Commercial, Permco, and Jihostroj.

| Dimension of HENGYUHANG 6PT6F+6PTF SAE C 2/4-Bolt Series

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

| Pump Installation Specifications HENGYUHANG 6PT6F+6PTF SAE C 2/4-Bolt Series

| Comprehensive Ordering Code Breakdown (Hengyuhang 6PTF Tandem Series Structure)

Code structure — reference: 6PT6F+6PTF−D1/D2−R−C−S−P1/P2−M−B

| Reading Your Replacement Code

| Techspecs of HENGYUHANG 6PT6F+6PTF SAE C 2/4-Bolt Series

| Performance Data Across Displacements

Note: Reference catalogue performance ratings based on ISO VG 46 mineral oil, T = 50 °C, ν = 30 mm²/s.

Dual Group 6 Stages (6PT6F / 6PTF)

Note: Technical values represent nominal catalogue reference ratings applicable to both the front 6PT6F and rear 6PTF pump stages. Combined dual-stage output flow can reach up to 400 l/min. Maximum continuous operating parameters are governed by cumulative input drive shaft torque ratings and operating temperature.

| Operating Conditions & Fluid Compatibility

Advantages

Extreme Duty Cast Iron Construction

Ductile cast iron bodies across both stages withstand severe pressure shocks, thermal expansion, and mechanical vibration under continuous pressures up to 280 bar and peak pressures reaching 350 bar (5,076 psi).

Universal SAE C 2/4-Bolt Combination Flange

Precision-machined combo pattern (181.0 mm 2-bolt pitch and 114.5 × 114.5 mm 4-bolt pattern) provides universal drop-in compatibility with either 2-bolt or 4-bolt SAE C mounting pads.

Massive Dual Independent High-Flow Delivery

Combines two heavy-duty Group 6 gear sets into a single compact footprint driven by one prime mover, providing combined flows up to 400 l/min without cross-circuit interaction.

Heavy-Duty Internal Splined Through-Drive

High-strength through-shaft and induction-hardened internal splined coupling transmit full downstream drive torque with zero shaft binding or parasitic journal deflection.

Superior Volumetric Efficiency (>94%)

Hydrostatically balanced floating thrust plates automatically compensate for thermal expansion and face wear, sustaining peak volumetric efficiency across thousands of harsh duty hours.

Low Noise & Hydraulic Pulsation

Precision-ground, case-hardened alloy steel gear profiles minimize trapped fluid pressure pulsation, ensuring smooth, quiet, and reliable operation.

Reference

Series Architecture & Displacements

• Series Nomenclature: HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 6PT6F+6PTF SAE C 2/4-Bolt Series

• Front Stage (Group 6PT6F): Displacements from 20.0 to 135.0 cm³/rev (14 standard displacement steps).

• Rear Stage (Group 6PTF): Displacements from 20.0 to 135.0 cm³/rev (14 standard displacement steps).

• Flange Standard: SAE C 2/4-Bolt Combination Flange (Pilot Ø127.0 mm / 5.00" h8, 181.0 mm 2-bolt and 114.5 mm × 114.5 mm 4-bolt pattern).

• Drive Shaft: SAE 14T spline (Code 07.00, Ø31.2 mm / 1-1/4"), SAE 1-1/4" straight keyed shaft (Code 04), or SAE 13T spline.

• Intermediate Coupling: Dedicated Group 6 to Group 6 internal involute splined through-drive coupling.

Comprehensive Interchangeability & Replacement Matrix

The HENGYUHANG 6PT6F+6PTF SAE C 2/4-Bolt series provides 1:1 drop-in replacement compatibility across the following premier global hydraulic pump manufacturers and designated series:

• CASAPPA: KP30, KP35, KP40, FDP30, HDP30, HDP35, FP30, FP40 cast iron series

• PARKER (Commercial Hydraulics): PGP330, PGP350, PGP315, PGP365, PGP620, PGP640, P20 series

• JIHOSTROJ: QHD0, QHD1, QHD2, GHD0, GHD1, GHD2 heavy-duty series

• DAVID BROWN: Heavy-duty cast iron hydraulic pump series

• METARIS: MH series commercial replacement cast iron pumps

• PERMCO (PERMCOP): P76, P75 series cast iron tandem pumps

• KOMATSU: OEM construction equipment tandem gear pump replacements

• CATERPILLAR: Heavy earthmoving machinery hydraulic implement and steering tandem pumps

• KAYABA (KYB): KFP series cast iron gear pumps

Brand Replacement

The HENGYUHANG 6PT6F+6PTF SAE C 2/4-Bolt series is precision-engineered as a direct 1:1 drop-in replacement for premier heavy-duty cast iron tandem gear pump lines, notably CASAPPA KP/FP/HDP series, PARKER Commercial PGP330/PGP350/PGP365/PGP620 series, and PERMCO P75/P76 series. Every tandem pump undergoes 100% factory dynamic testing across its full speed and pressure curve to guarantee volumetric efficiency, mechanical output, and dual-circuit pressure isolation up to 350 bar. Utilizing standard SAE C combination 2/4-bolt flange dimensions (Ø127.0 mm pilot, 181.0 mm 2-bolt / 114.5 × 114.5 mm 4-bolt spacing) and standardized SAE drive shafts, Hengyuhang pumps allow equipment manufacturers and service engineers to perform direct drop-in field replacements without piping rework, bracket redesign, or system modifications. Custom displacement pairings, shared or separate suction ports, and specialized shaft extensions are fully supported with rapid turnaround.

Applications

• Heavy Mining & Earthmoving Equipment: High-tonnage rigid dump trucks, large mining excavators, heavy wheel loaders, and track dozers.

• Large Mobile Cranes & Port Machinery: Reach stackers, mobile harbor cranes, straddle carriers, and heavy cargo handling equipment.

• Heavy Agricultural Harvesters & Tractors: Combined hydraulic implement lift and hydrostatic auxiliary motor drive circuits for extra-high-horsepower agricultural machinery.

• Oilfield & Marine Equipment: Offshore drilling hydraulic winches, wireline units, top-drive auxiliary power packs, and offshore deck cranes.

• Industrial Heavy Hydraulic Power Units (HPUs): High-pressure continuous extrusion presses, heavy scrap metal shears, forging presses, and steel mill roll handling systems.

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 premier global brands (Casappa, Parker, Permco, Jihostroj, Komatsu, Caterpillar, 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 ductile cast iron castings, alloy steel 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.