Gear pump
External Hydraulic Gear Pump . Group 3PDF 20CC-71CC SAE A 2-Bolt Oval Flange Series
Hengyuhang External Hydraulic Gear Pump Group 3PDF SAE 2-Bolt Oval Flange Series 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 External Hydraulic Gear Pump Group 3PDF SAE 2-Bolt Oval Flange Series
This external gear pump is engineered for heavy-duty fluid transfer and hydraulic circuit pressurization across industrial manufacturing, agricultural machinery, and mobile hydraulic systems. It powers auxiliary functions, steering circuits, and drive mechanisms in equipment operating under continuous high loads and severe environmental conditions.
| Key Technical Specifications
Product Model: Hengyuhang External Hydraulic Gear Pump Group 3PDF SAE 2-Bolt Oval Flange Series
Brand Replacement: CASAPPA, Rexroth, Marzocchi, Parker OEM or as requested.
Displacement: 20 to 71 cm³/rev
Rotation Direction: Clockwise (D), counter-clockwise (S), reversible (R)
Speed Range: Min. speed 400 to 600 r/min; Max. speed 2500 to 3500 r/min
Peak Pressure: 220 to 280 bar
- Description
- Tecspecs
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| Overview of HENGYUHANG Group 3PDF SAE 2-Bolt Oval Flange Series External Hydraulic Gear Pumps
The HENGYUHANG Group 3PDF SAE 2-Bolt Oval Flange Series is specifically engineered to meet American SAE standards (SAE J744) for heavy-duty mobile machinery and industrial hydraulic equipment. Featuring a precision-machined 2-bolt oval mounting flange with a standard pilot diameter of Ø 101.6 mm (4.0 in) and 146.0 mm (5.75 in) bolt center distance, combined with a heavy-duty Ø 22.22 mm (7/8 in) cylindrical keyed drive shaft, this series offers seamless integration into standard SAE bell housings and PTO drive interfaces. Covering high-delivery displacements from 20.0 up to 71.0 cm³/rev, it provides direct, drop-in replacement across 39 leading international hydraulic manufacturers without necessitating mounting bracket modifications, bell-housing adapters, or driveline realignment.
Constructed using a high-density extruded aerospace-grade aluminum alloy central gear casing paired with heavy-duty spheroidal graphite ductile cast-iron or aluminum front SAE 2-bolt mounting flanges and rear end-covers, the pump resists housing barrel dilation under severe continuous working pressures up to 250 bar (3,625 psi) and transient peak pressures up to 280 bar (4,060 psi). The internal rotating group incorporates case-hardened, precision-ground alloy steel gears supported by high-load hydrodynamic composite DU/PTFE sleeve bushings. Dual hydrostatic floating axial pressure balance thrust plates automatically compensate for operating wear and thermal clearance variations, sustaining volumetric efficiencies above 94% while providing smooth, low-pulsation fluid delivery across demanding mobile construction machinery and heavy industrial hydraulic power units.
| Dimension of HENGYUHANG Group 3PDF SAE 2-Bolt Oval Flange Series External Hydraulic Gear Pumps
Interface data needed with the drawing:
| Item | Value |
|---|---|
| Mounting flange | SAE 2-bolt oval mounting flange (pilot Ø 101.6 -0.05 mm / 4.0 in with 146.0 mm / 5.75 in bolt center distance, 2-Ø 14.3 mm mounting bolt holes, overall flange 174.0 × 156.0 mm, 9.5 mm pilot depth) |
| Drive shaft | Standard cylindrical keyed shaft R4 (Ø 22.22 -0.03 mm / 7/8 in, key width 6.35 -0.03 mm / 1/4 in, key height 24.9 mm, 41.0 mm total extension from pilot face: 33.0 mm shaft length + 8.0 mm shoulder) / Optional 13T / 15T SAE involute splined shaft / 1:8 European taper shaft |
| Outboard bearing | Standard without front bearing (direct bell-housing coupling engagement) / Optional heavy-duty front radial/axial bearing for belt, chain, and pulley drive systems |
| Rotation | Clockwise (D) or Anti-clockwise (S), looking at the drive shaft end (Bi-directional reversible rotation available upon request) |
| Ports position | Side-positioned flanged/threaded ports on body / Rear-cover ports for compact manifold block integration |
| Inlet Port | Standard 4-bolt split flange port with 3/8-16 UNC or 7/16-14 UNC threads (Ø 27.0 mm or Ø 33.0 mm port bore with 52.4 × 26.2 mm or 58.7 × 30.2 mm bolt pitch) / 1-5/8-12 UN SAE straight-thread O-ring boss / G 1-1/4" BSPP thread |
| Outlet Port | Standard 4-bolt split flange port with 3/8-16 UNC or 7/16-14 UNC threads (Ø 19.0 mm or Ø 27.0 mm port bore with 47.6 × 22.2 mm or 52.4 × 26.2 mm bolt pitch) / 1-1/16-12 UN SAE straight-thread O-ring boss / G 3/4" or G 1" BSPP thread |
| Seals | N — Buna-N (NBR) elastomeric seals (-20 °C to +85 °C) standard; Viton (FKM) available for high-temperature hydraulic fluids (-15 °C to +110 °C) |
| Body construction | High-tensile extruded aluminum alloy body with ductile cast-iron or aluminum SAE 2-bolt oval front mounting flange and rear cover |
| Flange mounting bolt torque | 90 ±5 Nm (796 ÷ 840 lbf in) |
| Body tie-rod clamp bolt torque | 95 ±5 Nm (840 ÷ 885 lbf in) |
| Pump Installation Specifications HENGYUHANG Group 3PDF SAE 2-Bolt Oval Flange Series
The HENGYUHANG Group 3PDF SAE 2-Bolt Oval Flange Series pump utilizes a standardized modular ordering and specification code to ensure precise mechanical, hydraulic, and mounting interchangeability:
Code structure — reference: 3PDF-SAE — Group 3 Heavy-Duty SAE 2-Bolt Oval Flange High-Pressure External Gear Pump Series
| Segment | Meaning | Standard Options & Features |
|---|---|---|
| Series | 3PDF | Group 3 heavy-duty high-pressure external gear pump architecture with SAE 2-bolt oval flange (20.0 to 71.0 cm³/rev) |
| Displacement | 20 to 71 | Geometric displacement in cm³/rev (20, 22, 26, 33, 39, 46, 50, 52, 55, 63, 71) |
| Rotation | D / S / R | D: Clockwise; S: Anti-clockwise; R: Reversible / Bi-directional |
| Outboard Bearing | 0 / 1 | 0: Standard without front bearing; 1: With heavy-duty front radial/axial support bearing |
| Drive Shaft | R4 / S4 / T6 | R4: Ø 22.22 mm (7/8 in) cylindrical keyed shaft; S4: SAE 13T/15T splined shaft; T6: 1:8 European taper shaft |
| Mounting Flange | SB / SA | SB: SAE "B" 2-bolt oval flange (pilot Ø 101.6 mm, 146.0 mm pitch); SA: SAE "A" 2-bolt flange (pilot Ø 82.55 mm) |
| Ports Code | L / P | L: Side flanged/threaded body ports; P: Rear cover threaded ports |
| Inlet / Outlet | U4 / S3 / G3 | U4: 4-bolt UNC flanged ports (3/8-16 / 7/16-14 UNC); S3: SAE straight thread O-ring boss; G3: BSPP thread |
| Seals | N / V | N: Buna-N (NBR) standard; V: Viton (FKM) high-temperature seals |
| Special Features | RV / ST | RV: Integrated internal pressure relief valve; ST: Customized OEM body configuration |
| Reading your replacement code
| Your Target Brand & Model | HENGYUHANG 3PDF SAE Equivalent | Interchange Verification Notes |
|---|---|---|
| CASAPPA POLARIS PLP30 (SAE B 2-Bolt Flange S3/S5) | HENGYUHANG 3PDF SAE Series | 100% mounting spigot pilot Ø 101.6 mm, 2-bolt pitch (146.0 mm), shaft R4 (7/8 in), and UNC port centerlines match |
| Bosch Rexroth AZPF / AZPN (SAE 2-Bolt Flange) | HENGYUHANG 3PDF SAE Series | Identical mounting pilot, shaft dimensions, and continuous pressure rating match |
| MARZOCCHI 3P / ALP3 / GHP3 (SAE 2-Bolt Flange) | HENGYUHANG 3PDF SAE Series | Direct mechanical envelope match; identical UNC flanged port drillings |
| PARKER PGP517 / PGP620 (SAE B 2-Bolt Flange) | HENGYUHANG 3PDF SAE Series | Full hydraulic flow compatibility, exact 2-bolt oval pattern, and 7/8 in shaft interchange |
| DANFOSS Power Solutions (SNP3 / Turolla SAE Flange) | HENGYUHANG 3PDF SAE Series | Seamless drop-in fit for American and European mobile machinery, skid steers, and HPUs |
| VIVOLO (Vivoil) X3P / XV-3P (SAE 2-Bolt Flange) | HENGYUHANG 3PDF SAE Series | Direct interchange on shaft, flange, and side UNC flanged ports |
| SALAMI 3PB / 3PE (SAE 2-Bolt Flange) | HENGYUHANG 3PDF SAE Series | Identical bolt hole pattern, shaft dimensions, and gear journal high-pressure ratings |
| BUCHER Hydraulics AP300 / QX3 (SAE Mounting) | HENGYUHANG 3PDF SAE Series | Direct mounting fit for heavy industrial machine tools, presses, and mobile cranes |
Techspecs — HENGYUHANG Group 3PDF SAE 2-Bolt Oval Flange Series
Performance Data Across Displacements
| Model Code | Displacement (cm³/rev) | Displacement (in³/rev) | Continuous Pressure p1 (bar / psi) | Intermittent Pressure p2 (bar / psi) | Peak Pressure p3 (bar / psi) | Min. Speed (r/min) | Max. Speed (r/min) | Flow at 1500 r/min (l/min) |
|---|---|---|---|---|---|---|---|---|
| 3PDF-20-D*R4 | 20.00 | 1.220 | 250 / 3,625 | 265 / 3,843 | 280 / 4,060 | 600 | 3,500 | 30.00 |
| 3PDF-22-D*R4 | 22.00 | 1.343 | 250 / 3,625 | 265 / 3,843 | 280 / 4,060 | 600 | 3,500 | 33.00 |
| 3PDF-26-D*R4 | 26.00 | 1.586 | 250 / 3,625 | 265 / 3,843 | 280 / 4,060 | 600 | 3,000 | 39.00 |
| 3PDF-33-D*R4 | 33.00 | 2.014 | 230 / 3,335 | 250 / 3,625 | 270 / 3,915 | 500 | 3,000 | 49.50 |
| 3PDF-39-D*R4 | 39.00 | 2.380 | 230 / 3,335 | 250 / 3,625 | 270 / 3,915 | 500 | 3,000 | 58.50 |
| 3PDF-46-D*R4 | 46.00 | 2.807 | 230 / 3,335 | 250 / 3,625 | 270 / 3,915 | 500 | 3,000 | 69.00 |
| 3PDF-50-D*R4 | 50.00 | 3.051 | 220 / 3,190 | 240 / 3,480 | 260 / 3,770 | 500 | 3,000 | 75.00 |
| 3PDF-52-D*R4 | 52.00 | 3.173 | 220 / 3,190 | 240 / 3,480 | 260 / 3,770 | 500 | 3,000 | 78.00 |
| 3PDF-55-D*R4 | 55.00 | 3.356 | 200 / 2,900 | 230 / 3,335 | 250 / 3,625 | 400 | 2,800 | 82.50 |
| 3PDF-63-D*R4 | 63.00 | 3.844 | 200 / 2,900 | 230 / 3,335 | 250 / 3,625 | 400 | 2,800 | 94.50 |
| 3PDF-71-D*R4 | 71.00 | 4.333 | 180 / 2,610 | 200 / 2,900 | 220 / 3,190 | 400 | 2,500 | 106.50 |
Operating Conditions & Fluid Compatibility
| Operating Parameter | Specification | Recommendation & Limits |
|---|---|---|
| Hydraulic fluid type | Mineral oil-based hydraulic fluids | HL or HLP hydraulic oils to ISO 6743/4; DIN 51524 Class 1 and 2 |
| Fluid operating viscosity | 12 to 100 mm²/s (cSt) | Optimal operating viscosity range: 20 to 80 mm²/s (cSt) |
| Max. cold starting viscosity | Up to 1,000 mm²/s (cSt) | Short duration cold start at low speed without excessive load |
| Fluid operating temperature | -20 °C to +85 °C (-4 °F to +185 °F) | Standard NBR seals; Viton (FKM) seals required for +85 °C to +110 °C |
| Inlet suction line pressure | 0.7 to 3.0 bar absolute (10 to 44 psia) | Minimum suction line absolute pressure 0.7 bar (avoid cavitation) |
| Fluid cleanliness level | Class 20/18/15 to ISO 4406 | Recommended filtration: β25 ≥ 75 on return/suction circuit |
Advantages — HENGYUHANG Group 3PDF SAE 2-Bolt Oval Flange Series
Direct SAE OEM Drop-In Interchangeability
Precision-machined to standard SAE 2-bolt oval mounting dimensions (pilot Ø 101.6 mm with 146.0 mm bolt pitch), heavy-duty Ø 22.22 mm (7/8 in) cylindrical keyed drive shaft (R4), and standard UNC flanged ports, enabling immediate 1:1 drop-in replacement across 39 leading global manufacturers.
Superior High-Flow Fluid Power Delivery
Capable of generating up to 106.5 l/min at 1500 r/min (displacements up to 71 cm³/rev), providing massive hydraulic muscle for heavy mobile construction machinery, wheel loaders, and intensive industrial manufacturing systems.
High Continuous Pressure Resilience
High-strength extruded aluminum alloy body reinforced with heavy-duty spheroidal ductile cast-iron or aluminum end covers prevents casing barrel dilation under continuous operating pressures up to 250 bar (3,625 psi).
Outstanding Volumetric Efficiency (>94%)
Hydrostatic floating pressure balance thrust plates automatically compensate for wear and thermal clearance changes, sustaining peak flow output and minimizing internal slip over thousands of operating hours.
Low Acoustic Emission & Pulsation
Precision-shaved, case-hardened alloy steel gear profiles minimize fluid trapping and pressure pulsation, ensuring ultra-quiet operation in mobile machinery cabins and indoor industrial plants.
Flexible Port & Valve Customization
Readily configured with 4-bolt split flange ports (UNC threads), SAE straight-thread O-ring boss ports, BSPP cylindrical ports, or integrated relief valves tailored to bespoke customer requirements.
Reference — HENGYUHANG Group 3PDF SAE 2-Bolt Oval Flange Series
Series Architecture Across Group 3PDF SAE 2-Bolt Oval Flange Series
The HENGYUHANG Group 3PDF SAE 2-Bolt Oval Flange family covers 11 standardized displacements, ensuring optimal hydraulic matching:
Intermediate High-Pressure Range (20.0 – 26.0 cm³/rev): 3PDF-20, 3PDF-22, 3PDF-26
Mid-to-High Displacement Work-Horse Range (33.0 – 46.0 cm³/rev): 3PDF-33, 3PDF-39, 3PDF-46
Heavy-Duty High-Flow Output Range (50.0 – 71.0 cm³/rev): 3PDF-50, 3PDF-52, 3PDF-55, 3PDF-63, 3PDF-71
Comprehensive Interchangeability Matrix Across 39 Brands
The HENGYUHANG Group 3PDF SAE 2-Bolt Oval Flange Series provides proven mechanical, mounting, and hydraulic drop-in substitution for the following 39 international manufacturers:
ARGO-HYTOS: GP3 Series SAE 2-bolt external gear pumps
ASEDA: Group 3 SAE 2-bolt tractor implement gear pumps
ATOS: PFG-3 / PFE series SAE 2-bolt external gear pumps
B&C Hydraulics: GR3 series SAE 2-bolt compact gear pumps
BLUEASCEND: Group 3 SAE 2-bolt aluminum gear pumps for mobile machinery
Boden: Boden B3 / BG3 SAE 2-bolt hydraulic gear pumps
BONDIOLI & PAVESI: HP Series Group 3 SAE gear pumps (HP3, HPL3)
Brevini Fluid Power (Dana Brevini): OT300 / B300 series SAE 2-bolt heavy-duty pumps
BUCHER Hydraulics: AP300 / QX3 series SAE 2-bolt high-pressure gear pumps
Caproni: 30A / 30C / Group 3 SAE 2-bolt hydraulic gear pumps
CASAPPA: POLARIS Group 3 (PLP30 SAE B 2-bolt flange S3/S5, 3PDF, PL30) gear pumps
CONCENTRIC (Haldex): W1200 / W1500 Group 3 SAE 2-bolt external pumps
DANFOSS Power Solutions: SNP3NN / SNW3NN / SNM3NN Turolla D Series SAE 2-bolt Group 3 pumps
DUPLOMATIC: IGP3 / GP3 series SAE 2-bolt external gear pumps
Galtech: 3SP series SAE 2-bolt heavy-duty gear pumps
GRH Hydraulics: 3PF series SAE 2-bolt aluminum gear pumps
HANSA-TMP: Group 3 SAE 2-bolt gear pumps and power pack units
HESPER: Group 3 SAE 2-bolt mobile hydraulic gear pumps
HIDRAULICA: Group 3 SAE 2-bolt external gear pumps
HONOR Gear Pumps: Group 3 SAE 2-bolt series pumps
HPI (Hydraulique Professionnelle Industrielle): Series M3 / P3 SAE 2-bolt gear pumps
HYDAC: PGE103 series SAE 2-bolt external gear pumps
HYDROMAX: Group 3 SAE 2-bolt external hydraulic gear pumps
HYDRONIT: Group 3 SAE 2-bolt power pack central block gear pumps
JIHOSTROJ: J3 / Q3 Series Group 3 SAE 2-bolt hydraulic gear pumps
JOYANG: Group 3 SAE 2-bolt gear pumps for material handling
KOMPASS: Group 3 SAE 2-bolt industrial gear pumps
KRACHT: KF 3 / KP 3 series SAE 2-bolt high-performance gear pumps
MARZOCCHI: 3P / ALP3 / GHP3 series SAE 2-bolt high-pressure gear pumps
MetaHydra: Group 3 SAE 2-bolt custom gear pumps
PARKER Hannifin: PGP517 / PGP620 Series SAE B 2-bolt Group 3 gear pumps
REXPOWER: Group 3 SAE 2-bolt external gear pumps
Bosch Rexroth: AZPF / AZPG Series SAE 2-bolt Group 3 gear pumps
REXROTH-SIGMA: Sigma Group 3 SAE 2-bolt gear pumps
RONZIO: 03 Series Group 3 SAE 2-bolt high-pressure gear pumps
ROQUET: 3L / 3M Series Group 3 SAE 2-bolt external gear pumps
SALAMI: 3PB / 3PE series SAE 2-bolt heavy-duty gear pumps
SDH (Shengda Hydraulics): Group 3 SAE 2-bolt gear pumps
VIVOLO (Vivoil): X3P / XV-3P Series Group 3 SAE 2-bolt gear pumps
7. Brand Replacement
Quanzhou Hengyuhang Power Technology Co., Ltd. manufactures the Group 3PDF SAE 2-Bolt Oval Flange Series conforming to international OEM American SAE J744 2-bolt mounting standards. Every manufactured pump undergoes 100% end-of-line verification, including volumetric efficiency benchmarking, continuous rated pressure testing, and port thread gauge inspection. Equipment operators and hydraulic distributors can replace worn or discontinued original pumps from CASAPPA, Rexroth, MARZOCCHI, PARKER, and DANFOSS with zero alterations to existing bell housings, electric motor couplings, or hydraulic plumbing. Custom batch manufacturing with specialized drive shafts, special flange spigots, or integrated relief valves is fully supported.
8. Applications of HENGYUHANG Group 3PDF SAE 2-Bolt Oval Flange Series
Mobile Construction Machinery: Large excavators, heavy-duty wheel loaders, motor graders, crawler bulldozers, vibratory soil compactors, and hydraulic drilling rigs requiring rigid SAE 2-bolt bell-housing mounting.
Agricultural Equipment: High-horsepower articulated tractors, combine harvesters, self-propelled forage harvesters, large square balers, and forestry timber loaders.
Material Handling & Port Equipment: Heavy container handlers, reach stackers, rough-terrain forklifts, mobile harbor cranes, and truck-mounted telescopic cranes.
Stationary Industrial Hydraulic Power Units (HPUs): Heavy metal forming hydraulic presses, scrap metal compactors, injection molding machines, automated extrusion lines, and heavy foundry equipment.
Municipal & Specialty Vehicles: Large waste compactor trucks, municipal snow plows, vacuum sweeper high-flow hydraulic drives, and marine winch/deck machinery systems.
9. Package & Shipping
| Item | Details |
|---|---|
| Packaging | Neutral heavy-duty export carton with internal molded foam suspension; individual moisture-resistant sealed VCI polybags; export standard fumigation-free wooden pallets for batch consignments. |
| Selling Unit | Single item (MOQ: 1 piece for standard models; low MOQ for customized OEM configurations). |
| Single Package Size | 32.0 × 22.0 × 20.0 cm (12.60 × 8.66 × 7.87 in) per pump. |
| Single Gross Weight | 8.50 to 12.80 kg (18.74 to 28.22 lbs) depending on displacement and flange material. |
| Standard Lead Time | 3–7 business days for stock items; 15–20 business days for volume OEM batch customization. |
| Logistics & Express | Air express (DHL, FedEx, UPS, TNT), air freight, sea freight (FCL / LCL), and multimodal door-to-door DDP services worldwide. |
| Customization Services | Custom nameplate laser engraving, private labeling, custom drive shafts, integrated valves, and bespoke flange geometries. |
| Warranty & Support | 12 months comprehensive warranty from dispatch date; full lifetime technical support. |
10. Why Choose Hengyuhang?
Direct Factory Precision Manufacturing & CNC Excellence: Equipped with multi-axis CNC machining centers, high-precision gear hobbing machines, and automated micro-honing lines, Hengyuhang maintains sub-micron dimensional tolerances (Ra < 0.2 μm) on all internal gear teeth, journals, and housing cavities. This guarantees minimal internal friction, ultra-low hydraulic 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, high/low temperature volumetric efficiency testing (>94%), and acoustic noise spectrum profiling, ensuring zero-defect delivery to global OEM assembly lines.
Seamless 1:1 OEM Drop-In Interchangeability: Conforming precisely to international European standard, SAE ("AA", "A", "B", "C"), and DIN/ISO mounting configurations, our pumps deliver genuine plug-and-play replacement for over 39 leading global manufacturers. Machine operators and distributors can replace original units without modifying bell housings, drive couplings, or hydraulic line geometry, drastically reducing costly machine downtime.
Flexible Engineering Customization & Rapid Prototyping: Backed by an experienced in-house hydraulic engineering team, Hengyuhang offers comprehensive bespoke customization, including non-standard 4PTF/6PTF mounting flanges, special shaft tapers or splines, dual port configurations, and integrated relief or priority flow control valves. We support low-MOQ trial orders and agile custom prototyping to resolve obsolescence issues for out-of-production machinery.
Robust Supply Chain, Extensive Inventory & Fast Global Dispatch: With dedicated raw material casting facilities, high-strength extruded aluminum alloy reserves, and extensive finished inventory across Group 0, Group 1, Group 2, and Group 3 platforms, standard orders ship within 48 to 72 hours. We partner strategically with major international logistics carriers (DHL, FedEx, UPS, air/ocean freight) 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.
External Hydraulic Gear Pump Group 3PDF 20CC–71CC (SAE 2-Bolt Oval Flange Series - R4) is a heavy-duty, high-flow external hydraulic gear pump featuring an SAE 2-bolt oval mounting flange (146 mm bolt centers with Ø101.6 mm centering pilot). Engineered with an extruded high-strength aluminium alloy casing, case-hardened alloy steel gear sets, and pressure-compensated DU composite anti-friction thrust plates, this series offers 11 displacement ratings from 20 to 71 cm³/rev. It delivers continuous operating pressures (P1) up to 250 bar (peak pressure up to 280 bar) and operating speeds up to 3500 r/min. Configured with a heavy-duty Ø22.22 mm (7/8 in) straight keyed drive shaft (6.35 mm key) and industry-standard SAE 4-bolt Code 61 split-flange ports with UNC threaded bolt holes, the Group 3PDF-D*R4 series delivers high volumetric and mechanical efficiency, dependable continuous fluid power, and low operating noise in demanding mobile machinery and industrial hydraulic power units.
| Applications
The Group 3PDF SAE 2-bolt oval flange series is widely utilized across heavy mobile machinery and industrial installations, including agricultural tractors, combine harvesters, forestry equipment, wheel loaders, medium excavators, backhoe loaders, paving and road construction machines, heavy-duty forklift trucks, container telehandlers, refuse compaction trucks, mobile crane winch systems, and stationary industrial hydraulic power packs requiring standard SAE 2-bolt mounting with robust continuous delivery pressure and high flow rates.
| Key Specifications Overview
| Parameter | Specification |
|---|---|
| Series | Group 3PDF Series (3PDF-...-D*R4 SAE 2-Bolt Oval Flange) |
| Displacement Range | 20 ~ 71 cm³/rev (11 standard displacement sizes: 20, 22, 26, 33, 39, 46, 50, 52, 55, 63, 71 cm³/rev) |
| Continuous Operating Pressure (P1) | 180 ~ 250 bar (250 bar for 20~26 cc; 230 bar for 33~46 cc; 220 bar for 50~52 cc; 200 bar for 55~63 cc; 180 bar for 71 cc) |
| Intermittent Operating Pressure (P2) | 200 ~ 265 bar (265 bar for 20~26 cc; 250 bar for 33~46 cc; 240 bar for 50~52 cc; 230 bar for 55~63 cc; 200 bar for 71 cc) |
| Max. Peak Pressure (P3) | 220 ~ 280 bar (280 bar for 20~26 cc; 270 bar for 33~46 cc; 260 bar for 50~52 cc; 250 bar for 55~63 cc; 220 bar for 71 cc) |
| Rotational Speed Range | 400 ~ 3500 r/min (displacement dependent; up to 3500 r/min for 20~22 cc) |
| Body Construction | Extruded high-tensile aluminium alloy casing with cast iron front and rear end covers |
| Mounting Flange (R4) | SAE 2-bolt oval flange (174 mm width, 146 mm bolt centers, Ø101.6 mm pilot, 2 × Ø14.3 mm mounting holes) |
| Drive Shaft | Ø22.22 mm (7/8 in) straight keyed shaft, 6.35 mm (1/4 in) key width, 41 mm total shaft extension |
| Inlet Port (SAE Code 61) | SAE 4-bolt split flange port: 1 in (52.4 × 26.2 mm, 3/8-16UNC, Ø27 mm) for 20~52 cc; 1 1/4 in (58.7 × 30.2 mm, 7/16-14UNC, Ø33 mm) for 55~71 cc |
| Outlet Port (SAE Code 61) | SAE 4-bolt split flange port: 3/4 in (47.6 × 22.2 mm, 3/8-16UNC, Ø19 mm) for 20~52 cc; 1 in (52.4 × 26.2 mm, 3/8-16UNC, Ø27 mm) for 55~71 cc |
| Rotation Direction | Clockwise (D) standard / Counter-clockwise (S) optional |
| Hydraulic Fluid | Mineral-based hydraulic oil (ISO VG 46 / HLP) |
| Operating Temperature Range | -20°C to +80°C (standard NBR seals) |
| Technical Parameters & Performance Ratings (Group 3PDF-D*R4)
| Type / Model | Displacement (cm³/rev) | Max. Pressure (bar) | Max. Speed (r/min) | Min. Speed (r/min) | Dimensions (mm) | SAE Flange Ports (Inlet / Outlet) | ||||
|---|---|---|---|---|---|---|---|---|---|---|
| P1 (Cont.) | P2 (Int.) | P3 (Peak) | M | L | Inlet Port (A × B, C, D) | Outlet Port (a × b, UNC, d) | ||||
| 3PDF-20-D*R4 | 20.0 | 250 | 265 | 280 | 3500 | 600 | 128.0 | 63.0 | 52.4 × 26.2 mm, 3/8-16UNC, Ø27 mm | 47.6 × 22.2 mm, 3/8-16UNC, Ø19 mm |
| 3PDF-22-D*R4 | 22.0 | 250 | 265 | 280 | 3500 | 600 | 130.0 | 64.0 | 52.4 × 26.2 mm, 3/8-16UNC, Ø27 mm | 47.6 × 22.2 mm, 3/8-16UNC, Ø19 mm |
| 3PDF-26-D*R4 | 26.0 | 250 | 265 | 280 | 3000 | 600 | 133.0 | 65.0 | 52.4 × 26.2 mm, 3/8-16UNC, Ø27 mm | 47.6 × 22.2 mm, 3/8-16UNC, Ø19 mm |
| 3PDF-33-D*R4 | 33.0 | 230 | 250 | 270 | 3000 | 500 | 139.0 | 68.0 | 52.4 × 26.2 mm, 3/8-16UNC, Ø27 mm | 47.6 × 22.2 mm, 3/8-16UNC, Ø19 mm |
| 3PDF-39-D*R4 | 39.0 | 230 | 250 | 270 | 3000 | 500 | 146.0 | 72.0 | 52.4 × 26.2 mm, 3/8-16UNC, Ø27 mm | 47.6 × 22.2 mm, 3/8-16UNC, Ø19 mm |
| 3PDF-46-D*R4 | 46.0 | 230 | 250 | 270 | 3000 | 500 | 152.0 | 75.0 | 52.4 × 26.2 mm, 3/8-16UNC, Ø27 mm | 47.6 × 22.2 mm, 3/8-16UNC, Ø19 mm |
| 3PDF-50-D*R4 | 50.0 | 220 | 240 | 260 | 3000 | 500 | 156.0 | 77.0 | 52.4 × 26.2 mm, 3/8-16UNC, Ø27 mm | 47.6 × 22.2 mm, 3/8-16UNC, Ø19 mm |
| 3PDF-52-D*R4 | 52.0 | 220 | 240 | 260 | 3000 | 500 | 158.0 | 78.0 | 52.4 × 26.2 mm, 3/8-16UNC, Ø27 mm | 47.6 × 22.2 mm, 3/8-16UNC, Ø19 mm |
| 3PDF-55-D*R4 | 55.0 | 200 | 230 | 250 | 2800 | 400 | 160.0 | 79.0 | 58.7 × 30.2 mm, 7/16-14UNC, Ø33 mm | 52.4 × 26.2 mm, 3/8-16UNC, Ø27 mm |
| 3PDF-63-D*R4 | 63.0 | 200 | 230 | 250 | 2800 | 400 | 168.0 | 83.0 | 58.7 × 30.2 mm, 7/16-14UNC, Ø33 mm | 52.4 × 26.2 mm, 3/8-16UNC, Ø27 mm |
| 3PDF-71-D*R4 | 71.0 | 180 | 200 | 220 | 2500 | 400 | 175.0 | 86.0 | 58.7 × 30.2 mm, 7/16-14UNC, Ø33 mm | 52.4 × 26.2 mm, 3/8-16UNC, Ø27 mm |
| Mounting Flange, Shaft & Port Dimensions
| Feature | Design Specification |
|---|---|
| Mounting Flange | SAE 2-bolt oval flange (146 mm bolt centers, Ø101.6 mm pilot with 0/-0.05 mm tolerance, 9.5 mm protrusion, 2 × Ø14.3 mm holes) |
| Drive Shaft | Ø22.22 mm (7/8 in) straight shaft with 6.35 mm (1/4 in) woodruff/straight key, 41 mm length from mounting face |
| Inlet Flanged Port (20~52 cc) | SAE Code 61 1 in split flange pattern (52.4 × 26.2 mm spacing, 3/8-16UNC tapped holes, Ø27 mm through-hole) |
| Inlet Flanged Port (55~71 cc) | SAE Code 61 1 1/4 in split flange pattern (58.7 × 30.2 mm spacing, 7/16-14UNC tapped holes, Ø33 mm through-hole) |
| Outlet Flanged Port (20~52 cc) | SAE Code 61 3/4 in split flange pattern (47.6 × 22.2 mm spacing, 3/8-16UNC tapped holes, Ø19 mm through-hole) |
| Outlet Flanged Port (55~71 cc) | SAE Code 61 1 in split flange pattern (52.4 × 26.2 mm spacing, 3/8-16UNC tapped holes, Ø27 mm through-hole) |
HENGYUHANG 3PDF / 3PDM Series — Complete Model List
3PDF Series — Type D*R4
| Type |
|---|
| 3PDF-20-D*R4 |
| 3PDF-22-D*R4 |
| 3PDF-26-D*R4 |
| 3PDF-33-D*R4 |
| 3PDF-39-D*R4 |
| 3PDF-46-D*R4 |
| 3PDF-50-D*R4 |
| 3PDF-52-D*R4 |
| 3PDF-55-D*R4 |
| 3PDF-63-D*R4 |
| 3PDF-71-D*R4 |
3PDF Series — Type D*R5
| Type |
|---|
| 3PDF-20-D*R5 |
| 3PDF-25-D*R5 |
| 3PDF-32-D*R5 |
| 3PDF-40-D*R5 |
| 3PDF-50-D*R5 |
| 3PDF-63-D*R5 |
3PDM Series — Type R*T6
| Type |
|---|
| 3PDM-20-R*T6 |
| 3PDM-22-R*T6 |
| 3PDM-26-R*T6 |
| 3PDM-33-R*T6 |
| 3PDM-39-R*T6 |
| 3PDM-46-R*T6 |
| 3PDM-50-R*T6 |
| 3PDM-52-R*T6 |
| 3PDM-55-R*T6 |
| 3PDM-63-R*T6 |
| 3PDM-71-R*T6 |
3PDF Series — Type D*O1
| Type |
|---|
| 3PDF-20-D*O1 |
| 3PDF-22-D*O1 |
| 3PDF-26-D*O1 |
| 3PDF-33-D*O1 |
| 3PDF-39-D*O1 |
| 3PDF-46-D*O1 |
| 3PDF-50-D*O1 |
| 3PDF-52-D*O1 |
| 3PDF-55-D*O1 |
| 3PDF-63-D*O1 |
| 3PDF-71-D*O1 |
3PDF Series — Type D*T6
| Type |
|---|
| 3PDF-20-D*T6 |
| 3PDF-22-D*T6 |
| 3PDF-26-D*T6 |
| 3PDF-33-D*T6 |
| 3PDF-39-D*T6 |
| 3PDF-46-D*T6 |
| 3PDF-50-D*T6 |
| 3PDF-52-D*T6 |
| 3PDF-55-D*T6 |
| 3PDF-63-D*T6 |
| 3PDF-71-D*T6 |
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