Gear pump
Tandem Cast Iron Hydraulic Gear Pump 4PT2F+2PDF 4 Bolt Rectangular
Engineered with a high-strength ductile cast iron front body and a precision extruded aluminum rear stage, the HENGYUHANG 4PT2F+2PDF tandem hydraulic gear pump delivers dual-circuit fluid power with front-stage peak pressures up to 315 bar (4,568 psi) and exceptional volumetric efficiency exceeding 94%.
| Applications
Designed for demanding mobile and industrial hydraulic systems, this cross-frame tandem pump provides independent primary high-pressure fluid delivery and secondary auxiliary flow for heavy construction machinery, agricultural harvesters, material handling excavators, and stationary power units. Its rigid cast iron front structure withstands severe cyclic pressure surges and harsh outdoor operating conditions.
| Key Technical Specifications
Product Model: Hengyuhang Tandem Cast Iron Hydraulic Gear Pump 4PT2F+2PDF 4-Bolt Rectangular Series
Brand Replacement: CASAPPA, Rexroth, Marzocchi, Parker OEM or as requested.
Displacement: Front Stage (Group 4PT2F Cast Iron): 8 to 92 cm³/rev; Rear Stage (Group 2PDF): 4 to 30 cm³/rev
Rotation Direction: Clockwise (R), counter-clockwise (L), reversible (upon request)
Speed Range: Min. speed 350 r/min; Max. speed 3000 r/min
Peak Pressure: Up to 315 bar (4,568 psi / 31.5 MPa)
- Description
- Tecspecs
- Brand & Reference
- Download Tandem Cast Iron 4PT2F Hydraulic Gear Pump PDF
- Send an Inquiry
| Overview of HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 4PT2F+2PDF 4-Bolt Rectangular Series
The HENGYUHANG 4PT2F+2PDF 4-Bolt Rectangular Series is an advanced cross-frame tandem external gear pump that combines a heavy-duty Group 4 cast iron front pump stage (4PT2F) with a versatile Group 2 rear pump stage (2PDF). The 4PT2F front stage is cast from premium spheroidal graphite ductile iron (QT500), providing exceptional mechanical fatigue strength, thermal stability, and pressure retention up to 315 bar (4,568 psi). It incorporates an induction-hardened internal through-shaft coupling mechanism that seamlessly drives the rear 2PDF stage without parasitic deflection. Featuring European standard 4-bolt rectangular mounting geometry (Centring pilot Ø 50.8 mm, hole spacing 128.0 × 98.5 mm, Cover Code 09/15) and standard 1:8 tapered drive shafts (Shaft Code 12), the 4PT2F+2PDF series enables dual hydraulic circuits from a single prime mover, optimizing installation space and delivering 1:1 OEM drop-in interchangeability across leading international hydraulic brands.
| Dimension of HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 4PT2F+2PDF 4-Bolt Rectangular Series
| Interface Data Needed with the Drawing (Dimensional Reference Table)
| Interface Parameter | Engineering Specification & Dimensional Standard | Notes / Tolerance |
|---|---|---|
| Front Mounting Flange | European standard 4-bolt rectangular flange (Catalogue Code 09 / 15) | Cast iron front cover, 4-bolt rectangular pattern |
| Flange Centring Pilot | Ø 50.8 mm | Pilot tolerance h8 (-0.010 / -0.040 mm), depth 5.0 mm |
| Mounting Hole Centers | 128.0 mm (vertical) × 98.5 mm (horizontal) rectangular pattern | Precision CNC-machined centers |
| Mounting Bolt Holes | 4 × Ø 11.0 mm clearance through-holes | Designed for M10 high-tensile grade 10.9/12.9 bolts |
| Primary Drive Shaft | European standard 1:8 tapered shaft (Catalogue Code 12) | Taper 1:8, M14 × 1.5 threaded end with slotted nut |
| Drive Shaft Keyway | Woodruff key 4.0 mm × 7.5 mm (DIN 6888) | Precision-milled keyseat for positive drive coupling |
| Alternative Shafts | 14T/15T/16T splined shafts (Code 01/02/07/08), 1" / 7/8" / 30 mm keyed shafts | Available upon customer requirement |
| Intermediate Coupling | High-torque internal involute splined through-drive coupling | Connects 4PT2F front drive gear to 2PDF rear shaft |
| Front Stage Ports (4PT2F) | Flanged 4-bolt split flange (Metric / SAE) or BSPP threaded ports | Code E04/E05, A04/A05, G06/G07 per displacement |
| Rear Stage Ports (2PDF) | European 4-bolt diamond flange ports or BSPP cylindrical ports | Separate suction or shared common suction option |
| Housing Materials | Front: Spheroidal graphite ductile iron (QT500); Rear: Extruded aluminum alloy | Front cover, intermediate bracket, rear cover: ductile iron |
| Seals Material | Standard: NBR (-20 °C to +80 °C); Optional: FKM Viton (-10 °C to +200 °C) / HNBR | High-pressure anti-extrusion backup rings |
| Flange Fastening Torque | 68 – 75 N·m (M10 grade 10.9 bolts) | Cross-tightened in two stages |
| Pump Installation Specifications HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 4PT2F+2PDF 4-Bolt Rectangular Series
| Comprehensive Ordering Code Breakdown (Hengyuhang 4PTF Catalogue Structure)
Code structure — reference: 4PTF−D1/D2−R−C−S−P1/P2−M−B
| Code Position | Meaning & Available Values |
|---|---|
| 4PTF | Series designation (Group 4 Heavy-Duty Cast Iron Gear Pump) |
| D1 (Front Stage Displacement) | Selected from official 4PTF ratings: 08, 10, 13, 16, 18, 20, 25, 29, 32, 36, 40, 45, 51, 55, 63, 72, 81, 92 cm³/rev |
| D2 (Rear Stage Displacement) | Selected from Group 2 (2PDF) ratings: 04, 06, 08, 10, 11, 14, 16, 19, 22, 25, 26, 30 cm³/rev |
| R (Rotation Direction) | R = Clockwise (viewed from shaft end); L = Counter-Clockwise; B = Reversible / Bi-directional |
| C (Front Mounting Cover) | 09 = European 4-bolt rectangular flange (Pilot Ø 50.8 mm, 128×98.5 mm); 00 = SAE B 2/4-bolt; 01 = SAE B 2-bolt; 02 = SAE C 4-bolt |
| S (Drive Shaft Code) | 12 = European 1:8 tapered shaft (M14×1.5); 01 = SAE 13T spline; 02 = SAE 15T spline; 03 = SAE 1" straight keyed; 06 = SAE 7/8" straight keyed |
| P1/P2 (Inlet/Outlet Port Dimensions) | Flanged fittings metric (E), SAE (A), BSPP (G), or metric thread (M) |
| M (Seals Compound) | N = NBR Buna-N (standard); V = FKM Viton; H = HNBR |
| B (Outboard Bearing Option) | A = Without axial/radial force; B = With radial force; C = Heavy-duty axial and radial bearing package |
| Reading Your Replacement Code
| Code Segment | Example Value | Meaning & Configuration |
|---|---|---|
| Series & Stage Model | 4PTF.40/16 | Group 4 Cast Iron Front (40 cm³/rev) + Group 2 Rear (16 cm³/rev) |
| Rotation | R | Clockwise rotation when facing drive shaft extension |
| Mounting Flange | 09 | European standard 4-bolt rectangular flange (Ø 50.8 mm pilot, 128.0 × 98.5 mm) |
| Drive Shaft | 12 | European 1:8 cone taper shaft with M14 × 1.5 thread & woodruff key |
| Port Dimensions | E05E04 / E03E02 | Front stage 4-bolt metric flanged ports / Rear stage metric flanged ports |
| Seal Compound | N | Nitrile butadiene rubber (NBR) oil seals with fluoropolymer backup rings |
| Design Revision | A | Standard direct factory production series |
| Techspecs of HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 4PT2F+2PDF 4-Bolt Rectangular Series
| Performance Data Across Displacements
Note: Data based on official Hengyuhang 4PTF technical specifications: ISO VG 46 hydraulic mineral oil, T = 50 °C, ν = 30 mm²/s.
Front Stage — Group 4PT2F Cast Iron
| Model Code | Displacement (cm³/rev) | Flow @ 1500 rpm (l/min) | Continuous Pressure p1 (bar) | Intermittent Pressure p2 (bar) | Peak Pressure p3 (bar) | Max Speed (r/min) | Min Speed (r/min) | Input Power @ 250 bar (kW) |
|---|---|---|---|---|---|---|---|---|
| 4PTF.08 | 8.0 | 12.0 | 200 | 230 | 250 | 3,000 | 350 | 5.7 |
| 4PTF.10 | 10.0 | 15.0 | 200 | 230 | 250 | 3,000 | 350 | 7.1 |
| 4PTF.13 | 13.0 | 19.5 | 200 | 230 | 250 | 3,000 | 350 | 9.2 |
| 4PTF.16 | 16.0 | 24.0 | 200 | 230 | 250 | 3,000 | 350 | 11.4 |
| 4PTF.18 | 18.0 | 27.0 | 200 | 230 | 250 | 3,000 | 350 | 12.8 |
| 4PTF.20 | 20.0 | 30.0 | 230 | 250 | 280 | 3,000 | 350 | 14.2 |
| 4PTF.25 | 25.0 | 37.5 | 230 | 250 | 280 | 3,000 | 350 | 17.8 |
| 4PTF.29 | 29.0 | 43.5 | 230 | 250 | 280 | 3,000 | 350 | 20.6 |
| 4PTF.32 | 32.0 | 48.0 | 250 | 275 | 300 | 3,000 | 350 | 22.7 |
| 4PTF.36 | 36.0 | 54.0 | 275 | 290 | 315 | 3,000 | 350 | 25.6 |
| 4PTF.40 | 40.0 | 60.0 | 275 | 290 | 315 | 3,000 | 350 | 28.4 |
| 4PTF.45 | 45.0 | 67.5 | 275 | 290 | 315 | 3,000 | 350 | 32.0 |
| 4PTF.51 | 51.0 | 76.5 | 250 | 275 | 300 | 3,000 | 350 | 36.2 |
| 4PTF.55 | 55.0 | 82.5 | 230 | 250 | 280 | 3,000 | 350 | 39.6 |
| 4PTF.63 | 63.0 | 94.5 | 230 | 250 | 280 | 3,000 | 350 | 44.7 |
| 4PTF.72 | 72.0 | 108.0 | 200 | 230 | 250 | 3,000 | 350 | 51.1 |
| 4PTF.81 | 81.0 | 121.5 | 200 | 230 | 250 | 3,000 | 350 | 57.5 |
| 4PTF.92 | 92.0 | 138.0 | 160 | 180 | 210 | 3,000 | 350 | 65.3 |
Rear Stage — Group 2PDF
| Model Code | Displacement (cm³/rev) | Flow @ 1500 rpm (l/min) | Continuous Pressure p1 (bar) | Intermittent Pressure p2 (bar) | Peak Pressure p3 (bar) | Max Speed (r/min) | Min Speed (r/min) |
|---|---|---|---|---|---|---|---|
| 2PDF.04 | 4.0 | 6.0 | 250 | 280 | 300 | 3,500 | 600 |
| 2PDF.06 | 6.0 | 9.0 | 250 | 280 | 300 | 3,500 | 600 |
| 2PDF.08 | 8.5 | 12.8 | 250 | 280 | 300 | 3,500 | 550 |
| 2PDF.10 | 10.0 | 15.0 | 250 | 280 | 300 | 3,500 | 500 |
| 2PDF.11 | 11.0 | 16.5 | 250 | 280 | 300 | 3,500 | 500 |
| 2PDF.14 | 14.0 | 21.0 | 250 | 280 | 300 | 3,500 | 500 |
| 2PDF.16 | 16.0 | 24.0 | 250 | 280 | 300 | 3,500 | 500 |
| 2PDF.19 | 19.5 | 29.3 | 230 | 260 | 280 | 3,000 | 500 |
| 2PDF.22 | 22.5 | 33.8 | 210 | 240 | 260 | 3,000 | 500 |
| 2PDF.25 | 25.0 | 37.5 | 200 | 230 | 250 | 3,000 | 500 |
| 2PDF.26 | 26.0 | 39.0 | 180 | 210 | 240 | 2,800 | 500 |
| 2PDF.30 | 30.0 | 45.0 | 160 | 190 | 220 | 2,500 | 500 |
Note: Technical values represent nominal catalogue ratings. Final combined operating pressures and speed limits are determined by fluid operating temperature, circuit filtration, and cumulative input drive torque.
| Operating Conditions & Fluid Compatibility
| Parameter | Permissible Operating Range | Recommended Optimal Target |
|---|---|---|
| Working Fluid | Mineral oil-based hydraulic fluids (HL / HLP to DIN 51524) | High-quality anti-wear hydraulic oil |
| Operating Viscosity | 10 to 1000 mm²/s (cSt) | 20 to 80 mm²/s (cSt) |
| Max. Cold Start Viscosity | Up to 1200 mm²/s (p < 10 bar, n < 1500 r/min) | Pre-warm oil before applying heavy system loads |
| Fluid Temperature (NBR) | -20 °C to +80 °C (-4 °F to +176 °F) | +30 °C to +60 °C (+86 °F to +140 °F) |
| Fluid Temperature (FKM) | -10 °C to +200 °C (+14 °F to +392 °F) | Extreme temperature / synthetic fluid duties |
| Inlet Absolute Pressure | 0.8 to 2.2 bar absolute (12 to 32 psi) | Recommended 0.9 to 1.1 bar at pump suction |
| Fluid Cleanliness Class | ISO 4406 Class 20/18/15 (NAS 1638 Class 9) | Class 19/17/14 (NAS 8) for extended service life |
Advantages
Cast Iron High-Pressure Fatigue Durability
The 4PT2F front stage is manufactured from spheroidal graphite ductile iron (QT500), delivering immense structural stiffness that resists cyclic fatigue, bore breathing, and pressure spikes up to 315 bar (4,568 psi).
European Standard 4-Bolt Rectangular Compatibility
Built with precision-machined European Group 4 dimensions (Ø50.8 mm pilot, 128.0 × 98.5 mm hole pattern, Cover Code 09/15) and 1:8 tapered drive shafts (Code 12), ensuring instant drop-in replacement without bracket rework.
Dual-Circuit Independent Power Density
Enables a heavy-duty primary circuit (up to 138 l/min) and an independent auxiliary circuit (up to 45 l/min) driven from a single engine or motor take-off, eliminating extra gearboxes.
Heavy-Duty Through-Drive Splined Coupling
Equipped with a reinforced internal involute splined through-drive connection rated for full downstream hydraulic loads without angular deflection or premature fatigue.
Superior Volumetric Efficiency (>94%)
Utilizes micro-finished 12-tooth case-hardened alloy gears and precision hydrostatic thrust balance plates to ensure minimal internal slippage across high working pressures.
Ultra-Low Noise & Vibration Damping
High-density cast iron absorbs mechanical noise and fluid pulsation, operating significantly quieter than conventional aluminum gear pumps in demanding mobile environments.
Reference
Series Architecture & Displacements
Series Nomenclature: HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 4PT2F+2PDF 4-Bolt Rectangular Series
Front Stage (Group 4PT2F Cast Iron): Displacements from 8.0 to 92.0 cm³/rev (18 standard displacement steps).
Rear Stage (Group 2PDF): Displacements from 4.0 to 30.0 cm³/rev (12 displacement steps).
Flange & Shaft Standard: European Standard 4-bolt rectangular mount (Code 09) with 1:8 tapered keyed shaft (Code 12).
Through-Drive Coupling: Dedicated intermediate splined coupling connecting front and rear stages.
Comprehensive Interchangeability & Replacement Matrix
The HENGYUHANG 4PT2F+2PDF 4-Bolt Rectangular series provides drop-in replacement compatibility across the following 27 international hydraulic pump manufacturers and designated series:
MARZOCCHI: GHP2A, ALP2A, GHP2, ALP2, 1PD, GHP3, ALP3, GHP3A, ALP3A series
DANFOSS: SNP1NN, SNP3NN, SNW3NN, SNP2, SNW2 series
HYDAC: PGE102, PGE103, PGE104 series
ARGO-HYTOS: GP2, GP3, GP1 series
ATOS: PFG series
Brevini (Dana Brevini): OT100, OT200, OT300 series
BUCHER Hydraulics: AP100, AP200, AP212, AP300 series
BONDIOLI & PAVESI: HPLPA1, HPLPA2, HPLPA3 series
Boden: BAP1, BHP1, BAP2, BHP2, BHP3, BAP3 series
Caproni: 10A, 20A, 30A, 10C, 20C, 30C series
CASAPPA: KP20, PHP20, Polaris 20, PLP30, KP30, KP35, HDP30, HDP35 series
CONCENTRIC: WP300, WP900, WP1500 series
DUPLOMATIC: 1P, GP2, GP3, GP1 series
Galtech: 1SPA, 2SPA, 3GPG, 3SPA series
GRH: 1PF, 2PF, 3PF series
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
JIHOSTROJ: P23, J, T3, Q2, UD, QHD1, QHD2 series
PARKER (Commercial Hydraulics / Parker): PGP511, PGP517, PGP620, PGP640 series
Bosch Rexroth: AZPF, AZPG, AZPN, AZPT series
RONZIO: 02ZAG, 02ZCG, 02ZLG, 03ZBG, 03ZAG series
ROQUET: 1L0, PLA, GZ, G, GLA, PLC, PNA, PLJ, PLK, PLH, PLZ series
SDH: CBN, CBT, CBF series
VIVOLO (Vivoil): X1P, XV-1P, X2P, X3P, XV-2P, XV-3P series
Brand Replacement
The HENGYUHANG 4PT2F+2PDF 4-Bolt Rectangular series is precision-engineered to serve as a reliable, direct replacement for major global brands including CASAPPA, Bosch Rexroth, Parker, Marzocchi, Danfoss, Jihostroj, and Bondioli & Pavesi. Every pump undergoes 100% factory dynamic testing across its full speed and pressure curve to guarantee volumetric efficiency, continuous pressure integrity up to 315 bar, and minimal internal bypass. Utilizing strict ISO-standard European 4-bolt rectangular pilot centering (Ø50.8 mm) and standardized 1:8 tapered shaft geometries, Hengyuhang pumps allow equipment builders and maintenance engineers to perform drop-in field retrofits without pipe rework, adapter plates, or system modifications. Custom displacement pairings, shared or separate suction ports, and specialized shaft extensions are fully supported with rapid turnaround.
Applications
Heavy Mobile Construction Equipment: Primary boom/bucket circuit and auxiliary pilot steering/cooling circuits on crawler excavators, backhoe loaders, wheel loaders, and trenchers.
Agricultural Machinery: Main hitch lifting and auxiliary steering/hydraulic motor drives on heavy tractors, combine harvesters, and forage harvesters.
Material Handling & Lifting: Mast elevation and power steering circuits for heavy counterbalance forklifts, telehandlers, container reach stackers, and rough-terrain cranes.
Forestry & Municipal Vehicles: Feller bunchers, timber forwarders, road sweepers, refuse compactor trucks, and municipal snowplows.
Industrial Hydraulic Power Units (HPUs): Dual-pressure central hydraulic systems, plastic injection molding auxiliary circuits, scrap metal balers, and hydraulic press accumulator charging.
Package & Shipping
| Packaging Type | Heavy-duty export corrugated carton with custom molded shock-absorbing foam inserts; sea-freight orders packed in fumigation-free wooden cases |
|---|---|
| Port Protection | Heavy-duty threaded plastic port plugs and shaft sleeve protectors installed |
| Corrosion Prevention | External rust-preventive oil coating and vapor-corrosion inhibitor (VCI) polybag wrapping |
| Selling Unit | Single item (MOQ = 1 piece for standard models) |
| Package Dimensions | Approx. 460 mm × 250 mm × 230 mm (varies with displacement pairing) |
| Gross Weight | Approx. 22.0 – 28.5 kg (depending on displacement configuration) |
| Standard Lead Time | 3 – 5 business days for stocked components; 15 – 25 business days for volume OEM production |
| Shipping Methods | Global express air freight (DHL / FedEx / UPS / TNT) for urgent maintenance; Sea freight / Air cargo for wholesale orders |
| OEM & Customization | Private label laser marking, customer part numbering, and custom displacement combinations supported |
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 27+ international brands (Casappa, Rexroth, Marzocchi, Parker, Danfoss, Jihostroj, 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 spheroidal graphite ductile iron castings, precision 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.
Tandem Cast Iron Hydraulic Gear Pump Group 4PT2F+2PDF 4-Bolt Rectangular Flange Series (21.99~73.82 + 4.00~30.00 cm³/rev) is a high-pressure hybrid dual-stage external gear pump engineered to deliver maximum mechanical rigidity, high continuous operating pressure, and optimized weight balance across dual hydraulic circuits. Featuring a standard European Group 3 / Group 4 4-bolt rectangular mounting flange (centering pilot Ø50.8 mm / 2.000 in with 98.5 × 128.0 mm bolt hole centers and 4 × Ø11.4 mm through holes), this multi-section assembly integrates a heavy-duty spheroidal graphite ductile cast-iron front pump (4PT2F) with a lightweight, high-volumetric-efficiency Group 2 extruded aluminum rear pump (2PDF), coupled via a high-tensile internal spline through-drive intermediate shaft. The front cast-iron stage eliminates housing barrel dilation, joint separation, and fatigue failure under cyclic breakout shocks and high continuous working pressures (p1) up to 260 bar (3,770 psi) in standard casing (and up to 280 bar in heavy-duty configuration) with peak spike pressures (p3) up to 300~320 bar (4,350~4,640 psi). The rear aluminum stage delivers responsive auxiliary flow and high volumetric efficiency with continuous pressures up to 250 bar (3,625 psi). Offering 12 standardized displacements for the front stage (21.99, 26.70, 30.63, 34.56, 39.27, 41.62, 43.98, 46.34, 51.83, 56.54, 61.26, and 73.82 cm³/rev) and 10 standardized displacements for the rear stage (4.00, 6.00, 8.50, 11.00, 14.00, 16.50, 19.50, 22.50, 26.00, and 30.00 cm³/rev), the combined displacement spans 25.99 up to 103.82 cm³/rev (delivering up to 155.73 L/min @ 1500 rpm). Equipped with case-hardened alloy steel precision gears and hydrostatic floating thrust plates across both sections, the 4PT2F+2PDF series sustains over 94% volumetric efficiency and serves as a direct 1:1 drop-in replacement for CASAPPA KAPPA + POLARIS (KP30+PLP20), Bosch Rexroth (AZPN/AZPG+AZPF), Marzocchi (GHP3+ALP2), Parker Commercial (PGP517+PGP511), and Jihostroj (QHD3+P23) European 4-bolt hybrid dual gear pumps.
| Applications
The 4PT2F+2PDF European 4-bolt rectangular hybrid tandem hydraulic gear pump series is specifically developed for demanding mobile machinery, European agricultural tractors, and industrial machinery where primary circuits require heavy-duty cast-iron pressure endurance while auxiliary circuits demand smooth, high-efficiency secondary flow:
European Agricultural Tractors and Combine Harvesters: The primary ductile cast-iron pump operates heavy front-end loader arms, rear three-point hitches, and high-load hydraulic implements under severe continuous breakout pressure, while the secondary aluminum pump feeds responsive hydrostatic power steering and auxiliary spool valve circuits.
Telescopic Handlers and Rough-Terrain Forklifts: Powered directly from transmission or engine PTO bellhousings; the front cast-iron stage operates high-tonnage telescopic boom lift and crowd rams under continuous holding loads, while the rear aluminum stage supplies fluid to carriage side-shift, frame leveling, and steering circuits.
Medium Construction Wheel Loaders and Backhoe Loaders: The heavy-duty cast-iron pump withstands severe digging shock loads for boom and bucket cylinders, while the secondary aluminum pump powers variable-speed hydraulic cooling fans and auxiliary quick-coupler attachments.
High-Low Industrial Hydraulic Presses and Shears: Functions as an efficient dual-flow power unit; both stages combine to deliver high delivery volume during rapid cylinder approach, after which the secondary aluminum stage unloads to tank and the front cast-iron stage maintains high holding pressures up to 260 bar without structural deflection or overheating.
Commercial Municipal Vehicles and Refuse Trucks: The front cast-iron pump powers heavy compactor blade packing rams and container roll-off hoists, while the secondary aluminum pump powers auxiliary bin lifters, cab tilt hydraulics, and pilot control circuits.
Mobile Forestry Forwarders and Timber Equipment: Operates reliably under severe outdoor temperature fluctuations, supplying high-pressure fluid to felling grapple jaws and saw drives on the front cast-iron pump, while the rear aluminum pump powers cooling fan and auxiliary steering systems.
| Key Specifications Overview
| Parameter | Specification |
|---|---|
| Series Architecture | Heavy-Duty Hybrid Dual-Stage External Gear Pump (Group 4 Cast-Iron Front 4PT2F + Group 2 Aluminum Rear 2PDF) |
| Front Stage Displacement (4PT2F) | 21.99 ~ 73.82 cm³/rev (12 sizes: 21.99, 26.70, 30.63, 34.56, 39.27, 41.62, 43.98, 46.34, 51.83, 56.54, 61.26, 73.82 cm³/rev) |
| Rear Stage Displacement (2PDF) | 4.00 ~ 30.00 cm³/rev (10 sizes: 4.00, 6.00, 8.50, 11.00, 14.00, 16.50, 19.50, 22.50, 26.00, 30.00 cm³/rev) |
| Total Combined Displacement Range | 25.99 ~ 103.82 cm³/rev (modular dual-stage independent pairing: V1 + V2) |
| Continuous Operating Pressure (p1) | Front stage: 170 ~ 260 bar (up to 280 bar in heavy-duty casing); Rear stage: 170 ~ 250 bar (2,465 ~ 3,625 psi) |
| Intermittent Operating Pressure (p2) | Front stage: 190 ~ 280 bar (up to 300 bar); Rear stage: 190 ~ 275 bar (2,755 ~ 3,988 psi) |
| Max. Peak Pressure (p3) | Front stage: 210 ~ 300 bar (up to 320 bar); Rear stage: 210 ~ 300 bar (3,045 ~ 4,350 psi) |
| Combined Rotational Speed Range | Operational minimum: 500 ~ 700 min⁻¹ (governed by rear stage lubrication threshold); Maximum: 2500 ~ 2800 min⁻¹ |
| Volumetric Efficiency | ≥ 94% across both stages under rated pressure and operating temperature |
| Hydro-Mechanical Efficiency | ≥ 89% ~ 92% |
| Body and Housing Construction | Hybrid construction: spheroidal graphite ductile cast-iron front flange, front body, and intermediate adapter; high-strength extruded aluminum alloy rear body and end cover |
| Mounting Flange Standard | European Group 3 / Group 4 4-bolt rectangular flange (pilot Ø50.8 -0.025/-0.080 mm / 2.000 in, 98.5 × 128.0 mm bolt centers, 4 × Ø11.4 mm holes, face 122.0 × 152.0 mm) |
| Primary Drive Shaft Specification | European 1:8 taper shaft with woodruff key (key 4.0 × 12.2 mm, M14×1.5 locknut, max torque 280 Nm); optional straight keyed or involute splined shaft |
| Intermediate Coupling Mechanism | High-tensile alloy steel internal spline through-drive coupling connecting Group 4 and Group 2 stages (allowable intermediate torque: up to 140 Nm) |
| Hydraulic Port Connections | Front stage: European 4-bolt flanged ports (diamond/rectangular pattern) or BSPP; Rear stage: European 4-bolt flanged ports (G 3/4 inlet, G 1/2 outlet) or BSPP |
| Rotation Direction | Clockwise (D / Right-Hand) standard; Counter-Clockwise (S / Left-Hand) available upon request (viewed from drive shaft end) |
| Hydraulic Fluid Compatibility | Mineral-oil-based hydraulic fluids (HL / HLP to ISO 6743/4; DIN 51524 Class 1 and 2); optimal viscosity range: 20 ~ 80 mm²/s (cSt) |
| Operating Temperature Range | -20°C to +85°C (standard NBR seals); -15°C to +110°C (optional Viton FKM seals) |
| Assembly Tightening Torques | Flange mounting bolts: 85 ± 5 Nm; Front cast-iron tie-rod bolts: 95 ± 5 Nm; Rear aluminum tie-rod bolts: 60 ± 4 Nm; Shaft nut: 80 Nm |
| Technical Performance Matrix Across Available Stages
| Stage Model Code | Stage Material | Displacement cm³/rev (in³/rev) | Operating Pressure (bar / psi) | Speed Range (min⁻¹) | Flow @ 1500 rpm (L/min) | |||
|---|---|---|---|---|---|---|---|---|
| Continuous (p1) | Intermittent (p2) | Peak (p3) | Min. Speed | Max. Speed | ||||
| Front Primary Stage (Group 4PT2F Ductile Cast Iron Series — European 4-Bolt Interface) | ||||||||
| 4PT2F22 | Ductile Cast Iron | 21.99 (1.342) | 260 / 3,770 | 280 / 4,060 | 300 / 4,350 | 350 | 3000 | 32.99 |
| 4PT2F27 | Ductile Cast Iron | 26.70 (1.629) | 240 / 3,480 | 260 / 3,770 | 280 / 4,060 | 350 | 3000 | 40.05 |
| 4PT2F31 | Ductile Cast Iron | 30.63 (1.869) | 220 / 3,190 | 240 / 3,480 | 260 / 3,770 | 350 | 3000 | 45.95 |
| 4PT2F34 | Ductile Cast Iron | 34.56 (2.109) | 210 / 3,045 | 230 / 3,335 | 250 / 3,625 | 350 | 3000 | 51.84 |
| 4PT2F38 | Ductile Cast Iron | 39.27 (2.396) | 210 / 3,045 | 230 / 3,335 | 250 / 3,625 | 350 | 3000 | 58.91 |
| 4PT2F41 | Ductile Cast Iron | 41.62 (2.540) | 250 / 3,625 | 270 / 3,915 | 290 / 4,205 | 350 | 3000 | 62.43 |
| 4PT2F43 | Ductile Cast Iron | 43.98 (2.684) | 230 / 3,335 | 250 / 3,625 | 270 / 3,915 | 350 | 3000 | 65.97 |
| 4PT2F46 | Ductile Cast Iron | 46.34 (2.828) | 210 / 3,045 | 230 / 3,335 | 250 / 3,625 | 350 | 3000 | 69.51 |
| 4PT2F51 | Ductile Cast Iron | 51.83 (3.163) | 210 / 3,045 | 230 / 3,335 | 250 / 3,625 | 350 | 2500 | 77.75 |
| 4PT2F56 | Ductile Cast Iron | 56.54 (3.450) | 190 / 2,755 | 210 / 3,045 | 230 / 3,335 | 350 | 2500 | 84.81 |
| 4PT2F61 | Ductile Cast Iron | 61.26 (3.738) | 180 / 2,610 | 200 / 2,900 | 220 / 3,190 | 350 | 2500 | 91.89 |
| 4PT2F73 | Ductile Cast Iron | 73.82 (4.505) | 170 / 2,465 | 190 / 2,755 | 210 / 3,045 | 350 | 2500 | 110.73 |
| Rear Secondary Stage (Group 2PDF Extruded Aluminum Series) | ||||||||
| 2PDF4 | Extruded Aluminum | 4.00 (0.244) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 700 | 4000 | 6.00 |
| 2PDF6 | Extruded Aluminum | 6.00 (0.366) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 700 | 4000 | 9.00 |
| 2PDF8 | Extruded Aluminum | 8.50 (0.518) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 700 | 3800 | 12.75 |
| 2PDF11 | Extruded Aluminum | 11.00 (0.671) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 600 | 3800 | 16.50 |
| 2PDF14 | Extruded Aluminum | 14.00 (0.854) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 600 | 3500 | 21.00 |
| 2PDF16 | Extruded Aluminum | 16.50 (1.006) | 230 / 3,335 | 255 / 3,698 | 280 / 4,060 | 600 | 3500 | 24.75 |
| 2PDF19 | Extruded Aluminum | 19.50 (1.189) | 210 / 3,045 | 235 / 3,408 | 260 / 3,770 | 500 | 3200 | 29.25 |
| 2PDF22 | Extruded Aluminum | 22.50 (1.372) | 200 / 2,900 | 225 / 3,263 | 250 / 3,625 | 500 | 3000 | 33.75 |
| 2PDF26 | Extruded Aluminum | 26.00 (1.586) | 180 / 2,610 | 205 / 2,973 | 230 / 3,335 | 500 | 3000 | 39.00 |
| 2PDF30 | Extruded Aluminum | 30.00 (1.830) | 170 / 2,465 | 190 / 2,755 | 210 / 3,045 | 500 | 2800 | 45.00 |
| Mechanical Drive Guidelines and Torque Limitations
| Mechanical Parameter | Engineering Specification and Limit |
|---|---|
| Primary Shaft Max. Drive Torque (T1_max) | 280 Nm (2,478 lbf in) for European 1:8 taper shaft with woodruff key (key 4.0 × 12.2 mm, M14×1.5 locknut) |
| Intermediate Coupling Torque Limit (T2_max) | 140 Nm (1,239 lbf in) max torque transfer capacity for heavy-duty internal spline through-drive coupling connecting Group 4 and Group 2 stages |
| Cumulative Drive Torque Verification Formula | T_total = (V1 × p1) / (20 × π × η_hm) + (V2 × p2) / (20 × π × η_hm) ≤ T1_max |
| Secondary Stage Torque Verification Formula | T_rear = (V2 × p2) / (20 × π × η_hm) ≤ 140 Nm (protects through-drive intermediate spline coupling) |
| Recommended Stage Sequencing Rule | Always mount the heavy-duty ductile cast-iron stage at the front (4PT2F) and the aluminum auxiliary stage at the rear (2PDF) to preserve driveline integrity |
| 4-Bolt Rectangular Mounting Flange, Shaft and Port Details
| Interface Feature | Technical Standard and Dimension |
|---|---|
| Mounting Flange Standard | European Group 3 / Group 4 4-bolt rectangular mounting flange (pilot Ø50.8 -0.025/-0.080 mm / 2.000 in, pilot depth 5.0 mm) |
| Bolt Hole Center Distance | 98.5 mm × 128.0 mm rectangular hole centers with 4 × Ø11.4 mm through mounting holes (flange face 122.0 × 152.0 mm) |
| Primary Drive Shaft (Standard) | European 1:8 taper shaft with woodruff key (key 4.0 × 12.2 mm, M14×1.5 thread, locknut tightening torque 80 Nm, extension 47.0 mm) |
| Primary Drive Shaft (Optional) | Straight cylindrical keyed shaft or multi-tooth involute splined shaft |
| Intermediate Coupling Shaft | Heavy-duty alloy steel internal spline through-drive coupling connecting Group 4 and Group 2 stages (allowable torque: up to 140 Nm) |
| Front Stage Port Connections (4PT2F) | European 4-bolt flanged ports (diamond / rectangular bolt pattern) or BSPP gas cylindrical threads |
| Rear Stage Port Connections (2PDF) | European 4-bolt flanged ports (G 3/4 inlet, G 1/2 outlet) or BSPP gas cylindrical threads |
| 1:1 Direct-Fit OEM Brand Replacement Coverage
| Manufacturer Brand | Direct-Fit Drop-In Tandem Equivalent Series |
|---|---|
| CASAPPA | KAPPA + POLARIS Hybrid Series (KP30 Cast Iron Front + PLP20 Aluminum Rear with European 4-bolt rectangular flange) |
| Bosch Rexroth | AZPN / AZPG Group 3 Cast Iron Front + AZPF Group 2 Aluminum Rear dual modular gear pump units (European 4-bolt mount) |
| MARZOCCHI | GHP3 Heavy Cast Iron Front + ALP2 High Performance Aluminum Rear tandem gear pumps with 4-bolt rectangular flange |
| PARKER Commercial | PGP517 Cast Iron Front + PGP511 Aluminum Rear dual modular external gear pumps (European 4-bolt interface) |
| JIHOSTROJ | QHD3 Cast Iron Front + P23 Aluminum Rear hybrid tandem gear pumps with European rectangular mounting |
| DANFOSS / Turolla | SNP3 Cast Iron Front + SNP2 Aluminum Rear modular multiple gear pump assemblies with European 4-bolt flange |
| SALAMI | 3PB Cast Iron Front + 2PE Aluminum Rear hybrid double gear pumps with European rectangular mounting flange |
| BUCHER Hydraulics | AP300 / QX3 Cast Iron Front + AP212 Aluminum Rear hybrid double gear pump assemblies |
| Technical Performance Matrix Across Available Stages
| Stage Model Code | Stage Material | Displacement cm³/rev (in³/rev) | Operating Pressure (bar / psi) | Speed Range (min⁻¹) | Flow @ 1500 rpm (L/min) | |||
|---|---|---|---|---|---|---|---|---|
| Continuous (p1) | Intermittent (p2) | Peak (p3) | Min. Speed | Max. Speed | ||||
| Front Primary Stage (Group 4PT2F Ductile Cast Iron Series — European 4-Bolt Interface) | ||||||||
| 4PT2F22 | Ductile Cast Iron | 21.99 (1.342) | 260 / 3,770 | 280 / 4,060 | 300 / 4,350 | 350 | 3000 | 32.99 |
| 4PT2F27 | Ductile Cast Iron | 26.70 (1.629) | 240 / 3,480 | 260 / 3,770 | 280 / 4,060 | 350 | 3000 | 40.05 |
| 4PT2F31 | Ductile Cast Iron | 30.63 (1.869) | 220 / 3,190 | 240 / 3,480 | 260 / 3,770 | 350 | 3000 | 45.95 |
| 4PT2F34 | Ductile Cast Iron | 34.56 (2.109) | 210 / 3,045 | 230 / 3,335 | 250 / 3,625 | 350 | 3000 | 51.84 |
| 4PT2F38 | Ductile Cast Iron | 39.27 (2.396) | 210 / 3,045 | 230 / 3,335 | 250 / 3,625 | 350 | 3000 | 58.91 |
| 4PT2F41 | Ductile Cast Iron | 41.62 (2.540) | 250 / 3,625 | 270 / 3,915 | 290 / 4,205 | 350 | 3000 | 62.43 |
| 4PT2F43 | Ductile Cast Iron | 43.98 (2.684) | 230 / 3,335 | 250 / 3,625 | 270 / 3,915 | 350 | 3000 | 65.97 |
| 4PT2F46 | Ductile Cast Iron | 46.34 (2.828) | 210 / 3,045 | 230 / 3,335 | 250 / 3,625 | 350 | 3000 | 69.51 |
| 4PT2F51 | Ductile Cast Iron | 51.83 (3.163) | 210 / 3,045 | 230 / 3,335 | 250 / 3,625 | 350 | 2500 | 77.75 |
| 4PT2F56 | Ductile Cast Iron | 56.54 (3.450) | 190 / 2,755 | 210 / 3,045 | 230 / 3,335 | 350 | 2500 | 84.81 |
| 4PT2F61 | Ductile Cast Iron | 61.26 (3.738) | 180 / 2,610 | 200 / 2,900 | 220 / 3,190 | 350 | 2500 | 91.89 |
| 4PT2F73 | Ductile Cast Iron | 73.82 (4.505) | 170 / 2,465 | 190 / 2,755 | 210 / 3,045 | 350 | 2500 | 110.73 |
| Rear Secondary Stage (Group 2PDF Extruded Aluminum Series) | ||||||||
| 2PDF4 | Extruded Aluminum | 4.00 (0.244) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 700 | 4000 | 6.00 |
| 2PDF06 | Extruded Aluminum | 6.00 (0.366) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 700 | 4000 | 9.00 |
| 2PDF8 | Extruded Aluminum | 8.50 (0.518) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 700 | 3800 | 12.75 |
| 2PDF11 | Extruded Aluminum | 11.00 (0.671) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 600 | 3800 | 16.50 |
| 2PDF14 | Extruded Aluminum | 14.00 (0.854) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 600 | 3500 | 21.00 |
| 2PDF16 | Extruded Aluminum | 16.50 (1.006) | 230 / 3,335 | 255 / 3,698 | 280 / 4,060 | 600 | 3500 | 24.75 |
| 2PDF19 | Extruded Aluminum | 19.50 (1.189) | 210 / 3,045 | 235 / 3,408 | 260 / 3,770 | 500 | 3200 | 29.25 |
| 2PDF22 | Extruded Aluminum | 22.50 (1.372) | 200 / 2,900 | 225 / 3,263 | 250 / 3,625 | 500 | 3000 | 33.75 |
| 2PDF26 | Extruded Aluminum | 26.00 (1.586) | 180 / 2,610 | 205 / 2,973 | 230 / 3,335 | 500 | 3000 | 39.00 |
| 2PDF30 | Extruded Aluminum | 30.00 (1.830) | 170 / 2,465 | 190 / 2,755 | 210 / 3,045 | 500 | 2800 | 45.00 |
| Manufacturer Brand | Direct-Fit Drop-In Tandem Equivalent Series |
|---|---|
| CASAPPA | KAPPA + POLARIS Hybrid Series (KP30 Cast Iron Front + PLP20 Aluminum Rear with European 4-bolt rectangular flange) |
| Bosch Rexroth | AZPN / AZPG Group 3 Cast Iron Front + AZPF Group 2 Aluminum Rear dual modular gear pump units (European 4-bolt mount) |
| MARZOCCHI | GHP3 Heavy Cast Iron Front + ALP2 High Performance Aluminum Rear tandem gear pumps with 4-bolt rectangular flange |
| PARKER Commercial | PGP517 Cast Iron Front + PGP511 Aluminum Rear dual modular external gear pumps (European 4-bolt interface) |
| JIHOSTROJ | QHD3 Cast Iron Front + P23 Aluminum Rear hybrid tandem gear pumps with European rectangular mounting |
| DANFOSS / Turolla | SNP3 Cast Iron Front + SNP2 Aluminum Rear modular multiple gear pump assemblies with European 4-bolt flange |
| SALAMI | 3PB Cast Iron Front + 2PE Aluminum Rear hybrid double gear pumps with European rectangular mounting flange |
| BUCHER Hydraulics | AP300 / QX3 Cast Iron Front + AP212 Aluminum Rear hybrid double gear pump assemblies |
WhatsApp
Email
+86 19918575358
