Gear pump
Mini External Gear Pump.Group 1PUF 0.8CC-8CC
Hengyuhang Mini External Gear Pump Group 1PUF is a robust positive displacement gear pump designed to deliver high volumetric efficiency and stable fluid power under demanding industrial and mobile operating pressures.
| Applications of Hengyuhang Mini External Gear Pump Group 1PUF
This mini external gear pump is engineered for compact fluid power and hydraulic circuit pressurization across industrial automation, micro power units (HPUs), and mobile hydraulic systems. It powers auxiliary functions, steering boosters, and lift mechanisms in equipment operating under space-constrained conditions.
| Key Technical Specifications
Product Model: Hengyuhang Mini External Gear Pump Group 1PUF
Brand Replacement: CASAPPA, Rexroth, Marzocchi, Parker OEM or as requested.
Displacement: 0.8 to 8 cm³/rev.
Rotation Direction: Clockwise (D), counter-clockwise (S), reversible (R).
Speed Range: Min. speed 600 r/min; Max. speed 3500 to 5000 r/min.
Peak Pressure: 210 to 300 bar.
Overview — HENGYUHANG Group 1PUF Mini External Gear Pumps
The HENGYUHANG Group 1PUF series represents precision hydraulic engineering tailored to provide flexible, reliable, and standardized fluid power across the 0.8 to 8.0 cm³/rev displacement envelope. As one of the most widely utilized hydraulic gear pump frame sizes globally, Group 1 pumps are deployed in thousands of distinct machine configurations requiring strict adherence to international mounting standards and high volumetric performance.
The pump features a three-piece modular structure consisting of a high-tensile extruded aluminum alloy body paired with heavy-duty cast-iron or aluminum front mounting flanges and end covers. Precision-hobbed alloy steel gear pairs are heat-treated and ground to micron-level profile tolerances, minimizing tooth clearance gaps and fluid trapping noise. Hydrodynamic DU sleeve bearings provide low friction and high radial load absorption under continuous pressure. Internally, floating bronze-faced axial pressure balance thrust plates automatically adjust their sealing face contact based on dynamic system pressure, compensating for thermal expansion and mechanical wear to maintain volumetric efficiencies above 94%. The series supports universal mounting configurations, including standard European 4-bolt spigot flanges, SAE "AA" 2-bolt flanges, and customized manifold block interfaces, providing direct mechanical compatibility with pumps from CASAPPA, Rexroth, MARZOCCHI, PARKER, and 35+ other leading manufacturers.
Dimension — HENGYUHANG Group 1PUF Mini External Gear Pumps
Interface data needed with the drawing
| Item | Value |
|---|---|
| Mounting flange | European standard 4-bolt rectangular flange (pilot Ø 25.4 mm, bolt pattern 52.4 x 72.0 mm) / SAE "AA" 2-bolt flange (pilot Ø 50.8 mm) |
| Drive shaft | 1:8 tapered shaft with woodruff key (M7x1 nut) / Ø 12.0 mm or Ø 12.7 mm cylindrical keyed shaft / involute spline shaft |
| Outboard bearing | Without outboard bearing (standard direct motor coupling fit) |
| Rotation | Clockwise (D) or Anti-clockwise (S), looking at drive shaft end (reversible configuration optional) |
| Ports position | Side-positioned ports (L) on body or Rear-cover positioned ports (P) for central manifold blocks |
| Inlet Port | G 3/8" or G 1/2" BSPP female thread (ISO 228/1) / European 4-bolt diamond flange (Ø 30 mm pattern) / 3/4-16 UNF |
| Outlet Port | G 3/8" or G 1/2" BSPP female thread (ISO 228/1) / European 4-bolt diamond flange (Ø 30 mm pattern) / 9/16-18 UNF |
| Seals | N — Buna-N (NBR) standard (-20 °C to +85 °C); Viton-FKM available for high-temperature and synthetic fluids (-15 °C to +110 °C) |
| Body construction | High-tensile extruded aluminum alloy body with ductile cast-iron or aluminum end covers |
| Flange bolt tightening torque | 30 ±3 Nm (265 ÷ 292 lbf in) |
| Body tie-rod clamp bolt torque | 35 ±3 Nm (310 ÷ 336 lbf in) |
Pump Installation Specifications — HENGYUHANG Group 1PUF Series
The HENGYUHANG Group 1PUF pump follows a standardized modular coding matrix that defines displacement, mechanical interfaces, and custom brand replacement parameters:
Code structure — reference: 1PUF — Group 1 Compact Hydraulic Gear Pump Series
| Segment | Meaning | Standard Options & Features |
|---|---|---|
| Series | 1PUF | Group 1 compact external gear pump architecture (0.8 to 8.0 cm³/rev) |
| Displacement | 0.8 to 8.0 | Specific displacement in cm³/rev (0.8, 1.2, 1.6, 2.0, 2.5, 3.2, 4.2, 5.0, 6.3, 7.0, 8.0) |
| Rotation | D / S / B | D clockwise, S anti-clockwise, B bi-directional (internal drain) |
| Flange Type | E1 / S2 / I4 | E1 (European 4-bolt Ø 25.4 pilot), S2 (SAE "AA" 2-bolt), I4 (Italian 4-bolt flange) |
| Drive Shaft | T8 / C12 / S9 | T8 (1:8 taper shaft), C12 (Ø 12 mm cylindrical keyed), S9 (involute spline) |
| Ports | G / F / U | G (BSPP G 3/8"-G 1/2"), F (European 4-bolt flanged), U (SAE O-Ring Boss UNF) |
| Seals | N / V | N (Buna NBR standard), V (Viton-FKM high temperature) |
| Mounting Orientation | S / R | S (Side ports on pump body), R (Rear ports on end-cover) |
Reading your code & brand replacement cross-references
| HENGYUHANG Model Code | Replaces CASAPPA Code | Replaces Rexroth Code | Replaces MARZOCCHI Code | Replaces PARKER / DANFOSS Code | Replaces VIVOLO / SALAMI Code | Displacement | Max. Continuous Pressure |
|---|---|---|---|---|---|---|---|
| 1PUF-0.8D-E1-T8-G-N | PLP10.1 / POLARIS 10 | AZPB-11-0008 / AZPF | 1P D 0.8 G | PGP505 / SNP1NN-0.8 | XV-1P/0.9 / 1.5PE-0.8 | 0.8 cm³/rev | 250 bar (3,625 psi) |
| 1PUF-1.2D-E1-T8-G-N | PLP10.1.5 / POLARIS 10 | AZPB-11-0012 / AZPF | 1P D 1.2 G | PGP505 / SNP1NN-1.2 | XV-1P/1.2 / 1.5PE-1.2 | 1.2 cm³/rev | 250 bar (3,625 psi) |
| 1PUF-1.6D-E1-T8-G-N | PLP10.2 / POLARIS 10 | AZPF-10-0016 | 1P D 1.6 G | PGP505 / SNP1NN-1.6 | XV-1P/1.7 / 1.5PE-1.6 | 1.6 cm³/rev | 250 bar (3,625 psi) |
| 1PUF-2.0D-E1-T8-G-N | PLP10.2.5 / POLARIS 10 | AZPF-10-0020 | 1P D 2.0 G | PGP505 / SNP1NN-2.0 | XV-1P/2.2 / 1.5PE-2.0 | 2.0 cm³/rev | 250 bar (3,625 psi) |
| 1PUF-2.5D-E1-T8-G-N | PLP10.3.15 / POLARIS 10 | AZPF-10-0025 | 1P D 2.5 G | PGP505 / SNP1NN-2.5 | XV-1P/2.6 / 1.5PE-2.5 | 2.5 cm³/rev | 250 bar (3,625 psi) |
| 1PUF-3.2D-E1-T8-G-N | PLP10.4 / POLARIS 10 | AZPF-10-0032 | 1P D 3.3 G | PGP505 / SNP1NN-3.2 | XV-1P/3.2 / 1.5PE-3.2 | 3.2 cm³/rev | 240 bar (3,480 psi) |
| 1PUF-4.2D-E1-T8-G-N | PLP10.5 / POLARIS 10 | AZPF-10-0042 | 1P D 4.2 G | PGP505 / SNP1NN-4.2 | XV-1P/4.3 / 1.5PE-4.2 | 4.2 cm³/rev | 230 bar (3,335 psi) |
| 1PUF-5.0D-E1-T8-G-N | PLP10.6.3 / POLARIS 10 | AZPF-10-0050 | 1P D 5.0 G | PGP505 / SNP1NN-5.0 | XV-1P/4.9 / 1.5PE-5.0 | 5.0 cm³/rev | 220 bar (3,190 psi) |
| 1PUF-6.3D-E1-T8-G-N | PLP10.8 / POLARIS 10 | AZPF-10-0063 | 1P D 6.3 G | PGP505 / SNP1NN-6.3 | XV-1P/5.9 / 1.5PE-6.3 | 6.3 cm³/rev | 200 bar (2,900 psi) |
| 1PUF-7.0D-E1-T8-G-N | PLP10.9 / POLARIS 10 | AZPF-10-0070 | 1P D 7.0 G | PGP505 / SNP1NN-7.0 | XV-1P/6.5 / 1.5PE-7.0 | 7.0 cm³/rev | 190 bar (2,755 psi) |
| 1PUF-8.0D-E1-T8-G-N | PLP10.10 / POLARIS 10 | AZPF-10-0080 | 1P D 8.0 G | PGP505 / SNP1NN-8.0 | XV-1P/7.5 / 1.5PE-8.0 | 8.0 cm³/rev | 180 bar (2,610 psi) |
Full cross-reference and drop-in dimensional compatibility also covers equivalent Group 1 models from: ARGO-HYTOS (GP1), ASEDA, ATOS (PFG-1), B&C, BLUEASCEND, Boden, BONDIOLI & PAVESI (HP1), Brevini (OT100), BUCHER (AP100), Caproni (10), CONCENTRIC, DUPLOMATIC (GP1), Galtech (1SP), GRH (1PF), HANSA-TMP, HESPER, HIDRAULICA, HONOR, HPI, HYDAC, HYDROMAX, HYDRONIT, JIHOSTROJ (P23/X), JOYANG, KOMPASS, KRACHT (KF1), MetaHydra, REXPOWER, REXROTH-SIGMA, RONZIO (01/02), ROQUET (1L), and SDH.
4. Techspecs of HENGYUHANG Group 1PUF Mini External Gear Pumps
Performance
| Parameter | 1PUF-0.8 | 1PUF-1.6 | 1PUF-2.5 | 1PUF-3.2 | 1PUF-4.2 | 1PUF-6.3 | 1PUF-8.0 | Unit |
|---|---|---|---|---|---|---|---|---|
| Geometric Displacement | 0.80 (0.049) | 1.60 (0.098) | 2.50 (0.153) | 3.20 (0.195) | 4.20 (0.256) | 6.30 (0.384) | 8.00 (0.488) | cm³/rev (in³/rev) |
| Continuous Operating Pressure p1 | 250 (3,625) | 250 (3,625) | 250 (3,625) | 240 (3,480) | 230 (3,335) | 200 (2,900) | 180 (2,610) | bar (psi) |
| Intermittent Operating Pressure p2 | 280 (4,060) | 280 (4,060) | 280 (4,060) | 260 (3,770) | 250 (3,625) | 220 (3,190) | 200 (2,900) | bar (psi) |
| Peak Working Pressure p3 | 300 (4,350) | 300 (4,350) | 300 (4,350) | 280 (4,060) | 270 (3,915) | 240 (3,480) | 220 (3,190) | bar (psi) |
| Maximum Continuous Speed | 5,000 | 5,000 | 4,500 | 4,000 | 3,500 | 3,000 | 2,500 | r/min |
| Minimum Operating Speed | 650 | 650 | 600 | 600 | 600 | 550 | 550 | r/min |
| Theoretical Flow @ 1,500 r/min | 1.20 (0.32) | 2.40 (0.63) | 3.75 (0.99) | 4.80 (1.27) | 6.30 (1.66) | 9.45 (2.50) | 12.00 (3.17) | l/min (US gpm) |
| Theoretical Flow @ 3,000 r/min | 2.40 (0.63) | 4.80 (1.27) | 7.50 (1.98) | 9.60 (2.54) | 12.60 (3.33) | 18.90 (4.99) | 24.00 (6.34) | l/min (US gpm) |
| Volumetric Efficiency | ≥ 94% | ≥ 94% | ≥ 95% | ≥ 95% | ≥ 95% | ≥ 95% | ≥ 95% | — |
| Hydro-mechanical Efficiency | ≥ 89% | ≥ 89% | ≥ 90% | ≥ 90% | ≥ 90% | ≥ 91% | ≥ 91% | — |
| Unit Mass (Approximate) | 1.10 (2.43) | 1.20 (2.65) | 1.30 (2.87) | 1.38 (3.04) | 1.48 (3.26) | 1.68 (3.70) | 1.85 (4.08) | kg (lbs) |
Interfaces and configuration
| Parameter | Value |
|---|---|
| Rotation | Clockwise (D) or Anti-clockwise (S); bi-directional rotation with internal drain optional |
| Mounting flange | European 4-bolt rectangular flange (pilot Ø 25.4 mm, 52.4x72 mm) / SAE "AA" 2-bolt flange (pilot Ø 50.8 mm) |
| Drive shaft | 1:8 tapered shaft with woodruff key (M7x1 nut) / Ø 12.0 mm / Ø 12.7 mm cylindrical keyed / involute spline shaft |
| Ports position | Side-positioned ports (L) on body or Rear-cover positioned ports (P) for central manifold blocks |
| Port sizing | G 3/8" or G 1/2" BSPP female thread (ISO 228/1) / European 4-bolt diamond flange / SAE O-Ring Boss UNF |
| Seals | N — Buna NBR standard (-20 °C to +85 °C); Viton-FKM optional for high temperatures (-15 °C to +110 °C) |
| Construction | High-tensile extruded aluminum body with ductile cast-iron or aluminum end covers |
| Flange bolt tightening torque | 30 ±3 Nm (265 ÷ 292 lbf in) |
| Body tie-rod clamp bolt torque | 35 ±3 Nm (310 ÷ 336 lbf in) |
Operating conditions
| Parameter | Value |
|---|---|
| Fluid | Mineral-oil-based hydraulic fluid to ISO 6743/4 (HL, HLP) and DIN 51524 |
| Inlet pressure range (absolute) | 0.7 ÷ 3.0 bar abs. (10 ÷ 44 psi abs.) |
| Viscosity — recommended | 17 to 60 mm²/s (cSt) [85 to 280 SSU] |
| Viscosity — permissible range | 10 to 1,000 mm²/s (cSt) [60 to 4,600 SSU] |
| Cold start maximum viscosity | 1,800 mm²/s (cSt) [8,300 SSU] |
| Fluid temperature, N seals | −20 °C to +85 °C continuous (−4 °F to +185 °F); 100 °C (212 °F) peak |
| Fluid temperature, V seals | −15 °C to +110 °C continuous (+5 °F to +230 °F); 125 °C (257 °F) peak |
| Required fluid cleanliness | ISO 4406 19/17/14 (NAS 1638 class 8) — filter rating β10(c) ≥ 200 |
| Storage conditions | Dry environment, 5 °C to 20 °C (41 °F to 68 °F), maximum 24 months |
| Dimensions | — see section 2. |
5. Advantages of HENGYUHANG Group 1PUF Mini External Gear Pumps
Complete 39-Brand Interchangeability. Built to standardized European, SAE, and international Group 1 specifications, providing 100% mechanical and hydraulic drop-in replacement across 39 global hydraulic pump brands without requiring piping, bracket, or coupling alterations.
High Continuous Pressure Capability. Rated up to 250 bar (3,625 psi) continuous operating pressure and 300 bar (4,350 psi) peak pressure, matching or exceeding original OEM specifications for demanding compact machinery.
High Volumetric Efficiency Across Full Life Cycle. Hydrostatic axial pressure balance plates actively adjust under load to seal gear side faces, maintaining volumetric efficiency above 94% across all temperature and viscosity conditions.
Low Operating Noise & Minimal Flow Pulsation. Precision tooth profiles, balanced anti-trapping relief pockets, and rigid body extrusion combine to dampen hydraulic resonance, ensuring quiet operation below 60 dBA.
Extended High-Speed Operational Range. High-load composite Teflon-lined DU sleeve bearings permit operating speeds up to 5,000 r/min, directly accommodating high-speed electric and engine drive couplings.
Modular Multi-Section Combinations. Available as single pumps or as modular tandem, triple, and multi-section pump combinations, allowing multiple hydraulic functions from a single drive input.
| Reference of HENGYUHANG Group 1PUF Mini External Gear Pumps
| 6.1 Series architecture across Group 1 micro displacements
| Model Code | Geometric Displacement | Continuous Pressure (p1) | Peak Pressure (p3) | Speed Range | Envelope Length (L) |
|---|---|---|---|---|---|
| 1PUF-0.8 | 0.80 cm³/rev (0.049 in³/rev) | 250 bar (3,625 psi) | 300 bar (4,350 psi) | 650 to 5,000 r/min | 73.0 mm (2.87 in) |
| 1PUF-1.2 | 1.20 cm³/rev (0.073 in³/rev) | 250 bar (3,625 psi) | 300 bar (4,350 psi) | 650 to 5,000 r/min | 76.0 mm (2.99 in) |
| 1PUF-1.6 | 1.60 cm³/rev (0.098 in³/rev) | 250 bar (3,625 psi) | 300 bar (4,350 psi) | 650 to 5,000 r/min | 79.0 mm (3.11 in) |
| 1PUF-2.0 | 2.00 cm³/rev (0.122 in³/rev) | 250 bar (3,625 psi) | 300 bar (4,350 psi) | 600 to 5,000 r/min | 82.0 mm (3.23 in) |
| 1PUF-2.5 | 2.50 cm³/rev (0.153 in³/rev) | 250 bar (3,625 psi) | 300 bar (4,350 psi) | 600 to 4,500 r/min | 86.0 mm (3.39 in) |
| 1PUF-3.2 | 3.20 cm³/rev (0.195 in³/rev) | 240 bar (3,480 psi) | 280 bar (4,060 psi) | 600 to 4,000 r/min | 91.0 mm (3.58 in) |
| 1PUF-4.2 | 4.20 cm³/rev (0.256 in³/rev) | 230 bar (3,335 psi) | 270 bar (3,915 psi) | 600 to 3,500 r/min | 99.0 mm (3.90 in) |
| 1PUF-5.0 | 5.00 cm³/rev (0.305 in³/rev) | 220 bar (3,190 psi) | 260 bar (3,770 psi) | 550 to 3,500 r/min | 105.0 mm (4.13 in) |
| 1PUF-6.3 | 6.30 cm³/rev (0.384 in³/rev) | 200 bar (2,900 psi) | 240 bar (3,480 psi) | 550 to 3,000 r/min | 115.0 mm (4.53 in) |
| 1PUF-7.0 | 7.00 cm³/rev (0.427 in³/rev) | 190 bar (2,755 psi) | 230 bar (3,335 psi) | 550 to 2,800 r/min | 120.0 mm (4.72 in) |
| 1PUF-8.0 | 8.00 cm³/rev (0.488 in³/rev) | 180 bar (2,610 psi) | 220 bar (3,190 psi) | 550 to 2,500 r/min | 128.0 mm (5.04 in) |
| 6.2 Complete replacement brand and cross-reference coverage
The Group 1PUF series is configured to directly replace the following manufacturer models and product series:
ARGO-HYTOS (GP1 Series)
ASEDA Group 1 Gear Pumps
ATOS (PFG-1 Series)
B&C Hydraulic Gear Pumps
BLUEASCEND Group 1 Series
Boden Group 1 Gear Pumps
BONDIOLI & PAVESI (HP1 Series)
Brevini Fluid Power / Dana Brevini (OT100 Series)
BUCHER Hydraulics (AP100 Series)
Caproni (Group 10 Series)
CASAPPA (POLARIS PLP 10 Series)
CONCENTRIC (W300 / W600 / Group 1 Series)
DANFOSS Power Solutions / Turolla (SNP1NN / SKP1NN / D Series)
DUPLOMATIC Oleodinamica (GP1 Series)
Galtech (1SP Series)
GRH (1PF Series)
HANSA-TMP (Group 1 Series)
HESPER Hydraulic Pumps
HIDRAULICA Group 1 Pumps
HONOR Gear Pumps
HPI Hydroperfect International (Series 1)
HYDAC (PGE100 Series)
HYDROMAX (HGP-1A Series)
HYDRONIT Compact Power Pack Pumps
JIHOSTROJ (P23 / X Series)
JOYANG Group 1 Pumps
KOMPASS (Group 1 Gear Pumps)
KRACHT (KF 1 Series)
MARZOCCHI (1P / ALP1 / GHP1 Series)
MetaHydra Group 1 Pumps
PARKER Hannifin (PGP 505 / PGP 502 Series)
REXPOWER Hydraulic Pumps
Rexroth / Bosch Rexroth (AZPF / AZPB Series)
REXROTH-SIGMA Series
RONZIO (01 / 02 Series)
ROQUET (1L Series)
SALAMI (1.5PE Series)
SDH Gear Pumps
VIVOLO / Vivoil (X1P / XV-1P Series)
| Brand Replacement
HENGYUHANG specializes in custom OEM replacement manufacturing for Group 1 hydraulic gear pumps. The Group 1PUF series is engineered to provide an exact 1:1 drop-in replacement across 39 international pump brands: ARGO-HYTOS, ASEDA, ATOS, B&C, BLUEASCEND, Boden, BONDIOLI, Brevini, BUCHER, Caproni, CASAPPA, CONCENTRIC, DANFOSS, DUPLOMATIC, Galtech, GRH, HANSA-TMP, HESPER, HIDRAULICA, HONOR, HPI, HYDAC, HYDROMAX, HYDRONIT, JIHOSTROJ, JOYANG, KOMPASS, KRACHT, MARZOCCHI, MetaHydra, PARKER, REXPOWER, Rexroth, REXROTH-SIGMA, RONZIO, ROQUET, SALAMI, SDH, and VIVOLO.
Every HENGYUHANG Group 1PUF pump conforms strictly to the physical dimensions, mounting pilot diameters (Ø 25.4 mm European standard or Ø 50.8 mm SAE "AA"), drive shaft tapers/splines, port centerlines (G 3/8", G 1/2", or 4-bolt flanged), and performance curves of original equipment. This enables equipment manufacturers, mobile machinery operators, and hydraulic maintenance centers to source high-grade replacements without modifying motor adapters, bell housings, or hydraulic plumbing.
All replacement pumps undergo 100% computerized bench testing under full continuous operating pressures up to 250 bar, verifying flow rate linearity, volumetric efficiency, noise levels, and external seal integrity before dispatch. Specify your original brand and part number when placing an order for immediate cross-referencing.
| Applications of HENGYUHANG Group 1PUF Mini External Gear Pumps
Typical equipment applications of the Group 1PUF hydraulic gear pump series:
Mobile Construction & Earthmoving: Mini excavators, micro loaders, skid-steer auxiliary circuits, and compact road rollers.
Aerial Work Platforms & Material Handling: Electric scissor lifts, vertical mast lifts, compact warehouse stackers, tail lifts, and loading dock levelers.
Mini Hydraulic Power Units: AC and DC (12V/24V/48V) hydraulic power packs for industrial presses, lift tables, and modular manifold assemblies.
Agricultural & Turf Machinery: Compact utility tractors, vineyard harvesters, micro trenchers, rotary mowers, and automated greenhouse equipment.
Automotive & Commercial Vehicles: Cabin tilt mechanisms, recovery vehicle winches, car transporter decks, and municipal sweeper hydraulic drives.
Industrial Automation & Machine Tools: Hydraulic clamping circuits, workpiece indexing tables, automatic lubrication units, and plastic blow-molding auxiliaries.
Marine & Offshore Equipment: Small boat hydraulic steering systems, anchor windlasses, trim tab actuators, and gangway controls.
In all applications, the pump delivers stable continuous high-pressure fluid flow with low noise, high volumetric efficiency, and extended service life.
| Package & Shipping
| Item | Specification |
|---|---|
| Packaging | Single unit packaged in protective shockproof carton with sealed port plugs; bulk orders in reinforced export crates |
| Selling unit | Single item — MOQ 1 unit |
| Net weight | Approximately 1.10 kg (1PUF-0.8) to 1.85 kg (1PUF-8.0) |
| Gross weight | Approximately 1.40 kg to 2.20 kg per unit with export carton packaging |
| Lead time | 3 to 7 working days for standard configurations; volume OEM batches per production schedule |
| Shipping | Air freight, ocean shipping, or international express (DHL, FedEx, UPS) directly to destination |
| Customization | Full customization of mounting flanges, shaft styles, rear/side ports, and laser nameplates |
| Warranty | 1 year comprehensive warranty against manufacturing defects |
| Why Choose Hengyuhang?
Custom Hydraulic Manufacturing Specialist. Quanzhou Hengyuhang Power Technology Co., Ltd. is located in Fujian, China, specializing in the precision design, manufacture, and custom adaptation of high-pressure hydraulic gear pumps, motors, and multi-section pump assemblies.
One-Piece Minimum Order Quantity. Custom-engineered units available with an MOQ of just 1 piece, providing immediate solutions for maintenance repairs, prototypes, and low-volume OEM equipment.
Extensive 39-Brand Cross-Referencing. Full cross-referencing capability replacing CASAPPA, Rexroth, MARZOCCHI, PARKER, DANFOSS, BUCHER, and 33+ other brands with guaranteed dimensional fit.
High-Precision CNC Machining. Equipped with automated CNC micro-machining centers and gear grinding equipment capable of maintaining tolerances within microns for high volumetric efficiency.
100% Computerized Bench Testing. Every pump is tested on automated computerized test benches to verify flow rate, pressure holding, volumetric efficiency, and low acoustic emissions before dispatch.
Fast Global Logistics. Direct connections to international logistics networks ensure prompt delivery of custom replacement pumps to minimize machinery downtime.
One-Year Comprehensive Warranty. Full 12-month warranty backed by responsive technical support for fitment confirmation and commissioning.
Mini External Gear Pump Group 1PUF (0.8~8 cm³/rev) is a high-performance, compact external hydraulic gear pump engineered for compact hydraulic power packs, mobile machinery, and precision fluid power applications. Built with a high-strength aluminium alloy body, hardened alloy steel gear pairs, and pressure-balanced DU thrust bushings, the Group 1PUF series delivers 14 standard displacements from 0.8 cm³/rev to 8.0 cm³/rev, continuous operating pressures up to 230 bar (peak up to 270 bar), and operating speeds up to 6000 r/min. Its standard European 4-bolt rectangular mounting flange (52.4 × 71.9 mm) and 1:8 taper shaft ensure reliable mechanical alignment, high volumetric efficiency, and quiet, dependable performance under continuous duty cycles.
| Applications
The Group 1PUF mini external gear pump series is widely utilized across compact hydraulic power packs (AC/DC micro power units, scissor lifts, dock levelers, tail lifts), light agricultural machinery (small tractors, fertilizer spreaders, mini mowers), light construction equipment (mini excavators, compact loaders, trenchers), industrial lubrication systems, test benches, and municipal utility vehicles requiring high pressure, compact envelope dimensions, and durable continuous service.
| Key Specifications Overview
| Parameter | Specification |
|---|---|
| Series | Group 1PUF Series (Group 1 Mini External Gear Pump) |
| Displacement Range | 0.8 ~ 8.0 cm³/rev (14 discrete model sizes) |
| Continuous Operating Pressure (P1) | 160 ~ 230 bar |
| Intermittent Pressure (P2) | 180 ~ 250 bar |
| Peak Pressure (P3) | 200 ~ 270 bar |
| Max. Speed Range | 2100 ~ 6000 r/min |
| Min. Speed Range | 600 ~ 1000 r/min |
| Body Construction Material | High-strength extruded aluminium alloy body with cast aluminium front flange and rear cover |
| Mounting Flange | Standard European 4-bolt rectangular flange (52.4 × 71.9 mm pattern, Ø25.4 mm pilot) |
| Drive Shaft | Tapered shaft 1:8 with 2.4 mm woodruff key and M7 threaded end |
| Inlet & Outlet Ports | 4-bolt flanged ports (4 × M6, Ø12 mm bore, 30 mm bolt circle) |
| Rotation Direction | Clockwise (D) standard / Counter-clockwise optional |
| Hydraulic Fluid | Mineral hydraulic oil (ISO VG 32 ~ 46, HLP) |
| Technical Specifications & Dimensional Parameters (Group 1PUF)
| Type | Displacement (cm³/rev) | Max. Pressure (bar) | Max. Speed (r/min) | Min. Speed (r/min) | Dimensions (mm) | |||
|---|---|---|---|---|---|---|---|---|
| P1 (Continuous) | P2 (Intermittent) | P3 (Peak) | M | L | ||||
| 1PUF-0.8-D*T0 | 0.8 | 230 | 250 | 270 | 6000 | 1000 | 73.5 | 32.8 |
| 1PUF-1.1-D*T0 | 1.1 | 230 | 250 | 270 | 6000 | 1000 | 74.0 | 33.0 |
| 1PUF-1.3-D*T0 | 1.3 | 230 | 250 | 270 | 6000 | 1000 | 75.0 | 33.5 |
| 1PUF-1.6-D*T0 | 1.6 | 230 | 250 | 270 | 6000 | 1000 | 76.0 | 34.0 |
| 1PUF-1.8-D*T0 | 1.8 | 230 | 250 | 270 | 6000 | 1000 | 77.0 | 34.5 |
| 1PUF-2.1-D*T0 | 2.1 | 230 | 250 | 270 | 6000 | 1000 | 78.0 | 35.0 |
| 1PUF-2.7-D*T0 | 2.7 | 230 | 250 | 270 | 6000 | 800 | 80.0 | 36.0 |
| 1PUF-3.2-D*T0 | 3.2 | 210 | 230 | 250 | 5000 | 800 | 82.0 | 37.0 |
| 1PUF-3.7-D*T0 | 3.7 | 210 | 230 | 250 | 4500 | 800 | 84.0 | 38.0 |
| 1PUF-4.2-D*T0 | 4.2 | 210 | 230 | 250 | 4000 | 800 | 86.0 | 39.0 |
| 1PUF-4.8-D*T0 | 4.8 | 190 | 210 | 230 | 3500 | 600 | 88.0 | 40.0 |
| 1PUF-5.8-D*T0 | 5.8 | 190 | 210 | 230 | 3000 | 600 | 92.0 | 42.0 |
| 1PUF-7.0-D*T0 | 7.0 | 160 | 180 | 200 | 2500 | 600 | 96.0 | 44.0 |
| 1PUF-8.0-D*T0 | 8.0 | 160 | 180 | 200 | 2100 | 600 | 100.0 | 46.0 |
HENGYUHANG 1PUF Series — Complete Model List
1PUF Series — Type D*K1
| Type |
|---|
| 1PUF-0.8-D*K1 |
| 1PUF-1.1-D*K1 |
| 1PUF-1.3-D*K1 |
| 1PUF-1.6-D*K1 |
| 1PUF-1.8-D*K1 |
| 1PUF-2.1-D*K1 |
| 1PUF-2.5-D*K1 |
| 1PUF-2.7-D*K1 |
| 1PUF-3.2-D*K1 |
| 1PUF-3.7-D*K1 |
| 1PUF-4.2-D*K1 |
| 1PUF-4.8-D*K1 |
| 1PUF-5.8-D*K1 |
| 1PUF-7.0-D*K1 |
| 1PUF-8.0-D*K1 |
1PUF Series — Type D*K2
| Type |
|---|
| 1PUF-0.8-D*K2 |
| 1PUF-1.1-D*K2 |
| 1PUF-1.3-D*K2 |
| 1PUF-1.6-D*K2 |
| 1PUF-1.8-D*K2 |
| 1PUF-2.1-D*K2 |
| 1PUF-2.7-D*K2 |
| 1PUF-3.2-D*K2 |
| 1PUF-3.7-D*K2 |
| 1PUF-4.2-D*K2 |
| 1PUF-4.8-D*K2 |
| 1PUF-5.8-D*K2 |
| 1PUF-7.0-D*K2 |
| 1PUF-8.0-D*K2 |
1PUF Series — Type D*K3
| Type |
|---|
| 1PUF-0.8-D*K3 |
| 1PUF-1.1-D*K3 |
| 1PUF-1.3-D*K3 |
| 1PUF-1.6-D*K3 |
| 1PUF-1.8-D*K3 |
| 1PUF-2.1-D*K3 |
| 1PUF-2.7-D*K3 |
| 1PUF-3.2-D*K3 |
| 1PUF-3.7-D*K3 |
| 1PUF-4.2-D*K3 |
| 1PUF-4.8-D*K3 |
| 1PUF-5.8-D*K3 |
| 1PUF-7.0-D*K3 |
| 1PUF-8.0-D*K3 |
1PUF Series — Type D*T0
| Type |
|---|
| 1PUF-0.8-D*T0 |
| 1PUF-1.1-D*T0 |
| 1PUF-1.3-D*T0 |
| 1PUF-1.6-D*T0 |
| 1PUF-1.8-D*T0 |
| 1PUF-2.1-D*T0 |
| 1PUF-2.7-D*T0 |
| 1PUF-3.2-D*T0 |
| 1PUF-3.7-D*T0 |
| 1PUF-4.2-D*T0 |
| 1PUF-4.8-D*T0 |
| 1PUF-5.8-D*T0 |
| 1PUF-7.0-D*T0 |
| 1PUF-8.0-D*T0 |
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