Tandem Mini Hydraulic Gear Pump 1PUF+1PUF

| Overview of HENGYUHANG Tandem Mini Hydraulic Gear Pump 1PUF+1PUF Series

The HENGYUHANG 1PUF+1PUF Series is a high-performance double mini external gear pump configuration uniting two Group 1 displacement sections via a heavy-duty internal through-shaft and precision splined coupling. This dual-circuit architecture eliminates the requirement for bulky split gearboxes, dual electric motors, or complex flow-divider valves, significantly reducing mechanical installation footprint, hydraulic plumbing complexity, and overall system weight. Both primary and secondary pump sections feature high-tensile extruded aluminum alloy gear housings, high-load case-hardened alloy steel gears, and floating bronze thrust compensation balance plates that automatically counterbalance pressure deflection.

Providing flexible displacement combinations from 0.8+0.8 cm³/rev up to 8.0+8.0 cm³/rev (with unequal flow combinations such as 4.2+2.0 cm³/rev or 6.0+1.2 cm³/rev fully supported), the 1PUF+1PUF series operates at continuous rated pressures up to 250 bar (3,625 psi) and maximum peak pressures up to 300 bar (4,350 psi). Available with separate inlet ports or an integrated common suction port for simplified tank suction lines, the series incorporates standardized European 4-bolt rectangular flanges (pilot Ø 25.4 mm), European diamond flanges (pilot Ø 30 mm), and SAE "AA" 2-bolt flanges. It serves as a verified 1:1 drop-in replacement across 27 leading international hydraulic manufacturers, ensuring reliable fluid power delivery in modern mobile and industrial equipment.

| Dimension of HENGYUHANG Tandem Mini Hydraulic Gear Pump 1PUF+1PUF Series

Interface data needed with the drawing:

| Pump Installation Specifications HENGYUHANG 1PUF+1PUF Series

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

Code structure — reference: 1PUF+1PUF — Tandem Mini External Hydraulic Gear Pump Series

| Reading your replacement code

Techspecs — HENGYUHANG 1PUF+1PUF Series

Displacement Performance Matrix (Per Stage)

Operating Conditions & Fluid Specifications

Advantages — HENGYUHANG 1PUF+1PUF Series

Dual Independent Circuit Power from One Drive

Powers two isolated hydraulic circuits (such as steering priority and implement work functions) from a single engine or electric motor drive, reducing machine complexity and assembly cost.

Ultra-Compact Footprint for Tight Enclosures

High power-to-weight ratio and minimal axial length allow effortless integration inside compact engine compartments and small mobile hydraulic power packs.

High Volumetric Efficiency (>94%)

Precision-ground gear teeth and hydrostatic pressure-balanced wear plates guarantee exceptional volumetric efficiency across high operating temperatures and fluctuating loads.

Flexible Flow Displacements

Any Group 1 displacement from 0.8 to 8.0 cm³/rev can be paired to achieve the exact flow ratio required between primary and secondary circuits.

Integrated Common Suction Option

Available with a single combined inlet port to simplify reservoir plumbing, eliminate duplicate suction hoses, and prevent air ingress risks.

Whisper-Quiet Operation

Micro-finished tooth profiles and specialized internal relief channels ensure low pressure ripple and minimal operating noise across all speed ranges.

Reference — HENGYUHANG 1PUF+1PUF Series

Series Architecture

The HENGYUHANG 1PUF+1PUF Series provides modular flexibility across 11 displacement sizes, allowing symmetrical and asymmetrical dual pump combinations:

• Equal Displacement Tandems (Symmetrical): 1PUF-0.8+0.8, 1PUF-1.2+1.2, 1PUF-2.0+2.0, 1PUF-3.2+3.2, 1PUF-4.2+4.2, 1PUF-6.0+6.0, 1PUF-8.0+8.0

• Differential Displacement Tandems (Dual-Flow): 1PUF-4.2+1.2, 1PUF-4.2+2.0, 1PUF-5.0+2.5, 1PUF-6.0+2.0, 1PUF-6.0+3.2, 1PUF-8.0+4.2

Target Brand Interchangeability Matrix

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

• MARZOCCHI: A1PD, 1PD Series (A1PD-D-0.8+0.8 through 8.0+8.0)

• DANFOSS: SNP1NN, SWP1NN Tandem Series

• HYDAC: PGE101, PGE104 Series

• ARGO-HYTOS: P23 Double Gear Pump Series

• ATOS: PFG Series Double Pumps

• Brevini: OT100 Series Tandem Gear Pumps

• BUCHER: AP100 Series Double Pumps

• BONDIOLI & PAVESI: HPLPA1 Tandem Series

• Boden: BAP1, BHP1 Series

• Caproni: 10A, 10C Series

• CASAPPA: PLP10 Polaris Double Pumps

• CONCENTRIC: WP300 Series

• DUPLOMATIC: 1P Series Tandem

• Galtech: 1SPA Series

• GRH: 1PF Series Double Pumps

• HANSA-TMP: 1SP Series

• HESPER: HA11, CHP1 Series

• HONOR: 1KH Series

• HPI: P1BAN1 Series

• HYDRONIT: E Series Mini Power Pack Pumps

• JIHOSTROJ: P23 Series

• PARKER: PGP505, PGP502 Series

• Rexroth: AZPB Series Double Gear Pumps

• RONZIO: 01ZAG, 01ZBG Series

• ROQUET: 1L0, 1PLA Series

• SDH: CBD Series

• VIVOLO: X1P, XV-1P Series

Brand Replacement

Quanzhou Hengyuhang Power Technology Co., Ltd. manufactures the 1PUF+1PUF Series to strict international tolerances, ensuring total mechanical and hydraulic interchangeability 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). Every manufactured unit undergoes computerized end-of-line digital testing, verifying volumetric displacement, continuous rated pressure holding, inter-stage seal isolation, and acoustic noise levels. Machine builders, hydraulic system integrators, and plant maintenance managers can directly replace OEM pumps with zero modifications to existing drive bells, shaft couplings, or hydraulic line geometry.

Applications — HENGYUHANG 1PUF+1PUF Series

• Mini Excavators & Compact Track Loaders: Independent supply for pilot joy-stick 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.