Tandem Hydraulic Gear Pump 1PD1F+1PDF

| Overview of HENGYUHANG Tandem Hydraulic Gear Pump 1PD1F+1PDF Series

The HENGYUHANG 1PD1F+1PDF Series is a precision double external gear pump assembly uniting two Group 1 (1PDF) standard hydraulic displacement sections via a heavy-duty internal through-shaft and hardened splined coupling. Spanning a broadened Group 1 displacement range from 1.4+1.4 cm³/rev up to 13.8+13.8 cm³/rev, this dual-stage architecture supplies two completely independent hydraulic circuits from a single engine PTO or electric motor. The tandem integration eliminates duplicate drive motors, heavy split gearboxes, and problematic flow-divider throttling circuits, substantially reducing equipment chassis space, installation labor, and overall hydraulic system weight.

Constructed with high-strength extruded aluminum alloy bodies, hardened one-piece integral gear-and-shaft assemblies, and hydrostatic pressure-balanced DU composite bushing plates, the 1PDF+1PDF series sustains exceptional volumetric and mechanical efficiencies above 94%. Both primary (P1) and secondary (P2) stages operate at rated continuous pressures up to 250 bar (3,625 psi) and peak spike pressures up to 300 bar (4,350 psi). Offered with separate suction ports or an integrated common suction port for simplified plumbing, the series incorporates standardized European 4-bolt rectangular flanges (pilot Ø 25.4 mm), European diamond flanges (pilot Ø 30.0 mm), and SAE "AA" 2-bolt flanges, providing seamless 1:1 drop-in interchangeability across 27 global hydraulic brands.

| Dimension of HENGYUHANG Tandem Hydraulic Gear Pump 1PD1F+1PDF Series

Interface data needed with the drawing:

| Pump Installation Specifications HENGYUHANG 1PD1F+1PDF Series

The HENGYUHANG 1PD1F+1PDF Series pump utilizes a standardized modular ordering code structure:

Code structure — reference: 1PD1F+1PDF — Tandem Hydraulic External Gear Pump Series

| Reading your replacement code

Techspecs — HENGYUHANG 1PD1F+1PDF Series

Displacement Performance Matrix (Per Stage)

Operating Conditions & Fluid Specifications

Advantages — HENGYUHANG 1PD1F+1PDF Series

Expanded Group 1 Displacement Range (Up to 13.8+13.8 cm³/rev)

Offers broader flow capacity than standard mini pumps, delivering up to 41.4 l/min per stage at 3,000 rpm while preserving the compact Group 1 mounting envelope.

Dual Independent Circuit Control

Powers two completely isolated hydraulic circuits from a single power source, perfectly separating work hydraulics from steering, fan drive, or pilot circuits.

High Volumetric Efficiency (>94%)

Precision-machined gear profiles and hydrostatic pressure-balanced wear plates guarantee minimal internal slip across high operating temperatures and cyclic pressures.

Compact Space & Weight Reduction

Eliminates the bulk, cost, and complexity of twin electric motors, secondary bell housings, or mechanical splitter gearboxes.

Common or Separate Suction Routing

Available with a unified inlet port on the primary section feeding both stages to minimize hydraulic reservoir hose connections, or separate inlets for dedicated reservoirs.

Low Noise & Low Pulsation

High-precision hobbed gear teeth and optimized internal decompression relief grooves ensure smooth, whisper-quiet operation across all speed ranges.

Reference — HENGYUHANG 1PDF+1PDF Series

Series Architecture

The HENGYUHANG 1PDF+1PDF Series provides modular flexibility across 11 displacement sizes:

• Stage 1 (1PDF Group 1): 1.4, 2.1, 2.8, 3.5, 4.1, 5.2, 6.2, 7.6, 9.3, 11.0, 13.8 cm³/rev

• Stage 2 (1PDF Group 1): 1.4, 2.1, 2.8, 3.5, 4.1, 5.2, 6.2, 7.6, 9.3, 11.0, 13.8 cm³/rev

• Common Popular Combinations: 1PD1F-2.1+1PDF-2.1, 1PD1F-3.5+1PDF-3.5, 1PD1F-4.1+1PDF-2.1, 1PD1F-6.2+1PDF-3.5, 1PD1F-7.6+1PDF-4.1, 1PD1F-11.0+1PDF-5.2, 1PD1F-13.8+1PDF-6.2

Target Brand Interchangeability Matrix

The HENGYUHANG 1PD1F+1PDF Series is engineered to provide verified 1:1 drop-in replacement across 27 leading international hydraulic brands:

• MARZOCCHI: GHP2A, ALP2A, GHP2, ALP2, 1PD Series (Double pump combinations)

• DANFOSS: SNP1NN, SNP2NN, SNW2NN Tandem Series

• HYDAC: PGE102, PGE104 Series

• ARGO-HYTOS: GP1, GP2, GP3 Double Gear Pump Series

• ATOS: PFG Series Double Pumps

• Brevini: OT100, OT200, OT300 Series Tandem Gear Pumps

• BUCHER: AP100, AP200, AP212, AP300 Series Double Pumps

• BONDIOLI & PAVESI: HPLPA1, HPLPA2, HPLPA3 Tandem Series

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

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

• CASAPPA: PLP10, PLP20, PLP30 (Polaris PLP10/10) Series

• CONCENTRIC: WP300, WP900, WP1500 Series

• DUPLOMATIC: 1P, GP1, GP2, GP3 Series Tandem

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

• GRH: 1PF, 2PF, 3PF Series Double Pumps

• 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 Mini Power Pack Pumps

• JIHOSTROJ: P23, J, T3, Q2, UD Series

• PARKER: PGP505, PGP502, PGP511, PGP517 Series

• Rexroth: AZPB, AZPF, AZPG, AZPN Series Double Gear Pumps

• RONZIO: 01ZAG, 01ZBG, 02ZAG, 02ZCG, 02ZLG Series

• ROQUET: 1L0, PLA, GZ, G, GLA, PLC Series

• SDH: CBD Series

• VIVOLO: X1P, XV-1P, X2P, X3P, XV-2P, XV-3P Series

Brand Replacement

Quanzhou Hengyuhang Power Technology Co., Ltd. manufactures the 1PD1F+1PDF Series conforming precisely to European and international SAE mounting standards. Every manufactured unit undergoes computerized end-of-line digital testing, verifying individual stage displacement, continuous rated pressure holding, inter-stage seal barrier isolation, and overall mechanical efficiency. Machine builders, hydraulic system integrators, and plant maintenance managers can directly replace OEM double pumps across all 27 specified brands (MARZOCCHI, DANFOSS, HYDAC, ARGO-HYTOS, ATOS, Brevini, BUCHER, BONDIOLI & PAVESI, Boden, Caproni, CASAPPA, CONCENTRIC, DUPLOMATIC, Galtech, GRH, HANSA-TMP, HESPER, HONOR, HPI, HYDRONIT, JIHOSTROJ, PARKER, Rexroth, RONZIO, ROQUET, SDH, VIVOLO) with zero modifications to drive bells, shaft couplings, or hydraulic line geometry.

Applications — HENGYUHANG 1PD1F+1PDF Series

• Mini Excavators & Compact Track Loaders: Independent supply for pilot joystick controls, swing drives, or auxiliary attachments.

• Aerial Work Platforms & Scissor Lifts: Dual hydraulic circuit actuation for lift elevation and auxiliary steering/drive systems.

• Agricultural Compact Tractors & Implements: Integrated steering priority circuits combined with hitch/implement lift hydraulics.

• Municipal Road Sweepers & Turf Maintenance Equipment: Dual drive for broom rotation, water spray pump actuation, and steering.

• Compact AC/DC Electro-Hydraulic Power Units: High-efficiency power packs for tail lifts, dock levelers, scissor tables, and vehicle hoists.

Package & Shipping

Why Choose Hengyuhang?

• Direct Factory Precision Manufacturing & CNC Excellence: Equipped with multi-axis CNC machining centers, automated high-speed gear hobbing, and ultra-fine micro-lapping equipment, Hengyuhang maintains sub-micron gear profile tolerances (Ra < 0.2 μm) and exact balance plate clearances. This guarantees minimal internal bypass leakage, virtually zero pressure pulsation, and repeatable performance across high-volume production batches.

• 100% Full-Cycle Multi-Parameter Factory Inspection: Every single hydraulic pump undergoes rigorous end-of-line digital testing before dispatch. Quality checks cover full continuous rated and peak pressure hold, internal bypass leakage verification, inter-stage seal barrier testing, high/low temperature volumetric efficiency testing (>92–94%), and acoustic noise spectrum profiling, ensuring zero-defect delivery.

• Seamless 1:1 OEM Drop-In Interchangeability: Conforming precisely to international European standard, SAE, and DIN/ISO mounting configurations, our pumps deliver genuine plug-and-play replacement for MARZOCCHI, DANFOSS, Rexroth, PARKER, and 23 other leading global manufacturers. Machine operators can replace original units without modifying bell housings, drive couplings, or hydraulic line geometry.

• Flexible Engineering Customization & Rapid Prototyping: Backed by an experienced in-house hydraulic engineering team, Hengyuhang offers comprehensive bespoke customization, including non-standard mounting flanges, special shaft tapers or splines, common or separate suction port routing, and integrated valve blocks. We support low-MOQ trial orders and agile custom prototyping to resolve obsolescence issues for high-end machinery.

• Robust Supply Chain, Extensive Inventory & Fast Global Dispatch: With dedicated casting, extrusion, and precision machining facilities, raw material reserves, and extensive finished inventory across all Group 1 displacement models, standard orders ship within 48 to 72 hours. We partner strategically with major international logistics carriers to provide seamless door-to-door DDP global delivery.

• 12-Month Comprehensive Warranty & Lifetime Technical Support: All Hengyuhang hydraulic pumps are backed by a complete 12-month factory warranty and dedicated lifetime technical assistance. Our specialized fluid power engineers provide free 24-hour CAD drawing verification, OEM cross-reference confirmation, hydraulic displacement calculations, and system troubleshooting to ensure total operational peace of mind.