Gear pump
Tandem Cast Iron Hydraulic Gear Pump 4PT4F+4PTF 4 Bolt Rectangular
Engineered with heavy-duty spheroidal graphite ductile iron bodies and a precision European standard 4-bolt rectangular mounting flange, the HENGYUHANG 4PT4F+4PTF dual Group 4 tandem gear pump delivers high-flow dual-circuit fluid power with peak pressures up to 315 bar (4,568 psi) and superior volumetric efficiency exceeding 94%.
| Applications
Designed for high-demand European and international mobile machinery and severe-duty industrial hydraulic power units, this dual Group 4 tandem pump independently drives heavy primary hydraulic working circuits and secondary steering, cooling, or auxiliary functions on crawler excavators, agricultural harvesters, forestry forwarders, and scrap metal balers. Its standardized European 4-bolt rectangular flange configuration enables direct 1:1 drop-in replacement onto existing equipment bellhousings without mechanical modifications.
| Key Technical Specifications
Product Model: Hengyuhang Tandem Cast Iron Hydraulic Gear Pump 4PT4F+4PTF 4 Bolt Rectangular Series
Brand Replacement: CASAPPA, Rexroth, Marzocchi, Parker OEM or as requested.
Displacement: Front Stage (Group 4PT4F Cast Iron): 8 to 92 cm³/rev; Rear Stage (Group 4PTF Cast Iron): 8 to 92 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 4PT4F Hydraulic Gear Pump PDF
- Send an Inquiry
| Overview of HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 4PT4F+4PTF 4 Bolt Rectangular Series
The HENGYUHANG 4PT4F+4PTF 4 Bolt Rectangular Series is an ultra-heavy-duty dual Group 4 cast iron tandem external gear pump engineered for demanding mobile and industrial hydraulic systems requiring high combined flow and dual independent delivery circuits. Both the front through-drive pump stage (4PT4F) and the rear pump stage (4PTF) are cast from high-tensile spheroidal graphite ductile iron , delivering outstanding fatigue durability, structural stiffness, and continuous pressure ratings up to 275 bar with peak pressure capability reaching 315 bar (4,568 psi). An oversized, induction-hardened internal involute splined through-shaft coupling transmits maximum downstream driving torque without shaft deflection or thermal binding. Featuring standard European 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) or optional splined shafts, this series offers complete 1:1 OEM drop-in interchangeability across 27+ leading international hydraulic brands.
| Dimension of HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 4PT4F+4PTF 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) | Precision cast iron front cover, 4-bolt rectangular pattern |
| Flange Centring Pilot | Ø 50.8 mm (2.00 in) | Pilot tolerance h8 (-0.010 / -0.040 mm), pilot depth 5.0 mm |
| Mounting Hole Centers | 128.0 mm (vertical) × 98.5 mm (horizontal) rectangular pattern | Standard European Group 3 / Group 4 rectangular pattern |
| Mounting Bolt Holes | 4 × Ø 11.0 mm through clearance 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 mechanical drive |
| Alternative Shafts | SAE 13T spline (Code 01), SAE 15T spline (Code 02), SAE 1" keyed (Code 03) | Available upon customer installation requirements |
| Intermediate Through-Drive | Dedicated high-torque internal splined coupling (Group 4 to Group 4) | High-strength alloy steel connecting front and rear drive gears |
| Front Stage Ports (4PT4F) | 4-bolt split flange (Metric / SAE) or BSPP cylindrical ports | Standard Code E04/E05, A04/A05, G06/G07 per displacement |
| Rear Stage Ports (4PTF) | 4-bolt split flange (Metric / SAE) or BSPP cylindrical ports | Independent inlet/outlet or common combined inlet configuration |
| Housing Construction | High-tensile spheroidal graphite ductile iron (QT500) | Front cover, intermediate coupling bracket, bodies, and rear cover |
| Seals Material | Standard: NBR (-20 °C to +80 °C); Optional: FKM Viton (-10 °C to +200 °C) / HNBR | Anti-extrusion backup rings for continuous high-pressure operation |
| Flange Fastening Torque | 68 – 75 N·m (M10 grade 10.9 bolts) | Cross-tightened evenly in two stages |
| Pump Installation Specifications HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 4PT4F+4PTF 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 Tandem Gear Pump) |
| D1 (Front Stage Displacement) | Selected from Group 4 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 4 ratings: 08, 10, 13, 16, 18, 20, 25, 29, 32, 36, 40, 45, 51, 55, 63, 72, 81, 92 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, 128.0 × 98.5 mm); 15 = European 4-bolt rectangular; 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.45/36 | Dual Group 4 Cast Iron: Front (45 cm³/rev) + Rear (36 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 / E05E04 | 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 4PT4F+4PTF 4 Bolt Rectangular Series
| Performance Data Across Displacements
Note: Reference test conditions: ISO VG 46 hydraulic mineral oil, T = 50 °C, ν = 30 mm²/s.
Front & Rear Stages — Group 4PT4F / 4PTF Cast Iron (Shared Group 4 Ratings)
| 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 |
Note: Both front (4PT4F) and rear (4PTF) pump stages utilize the identical high-performance Group 4 cast iron displacement ratings. Combined total delivery flow exceeds 270 l/min at rated speeds. Maximum continuous operating parameters are subject to the total cumulative drive shaft torque rating.
| 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
Dual Group 4 Heavy-Duty Cast Iron Construction
Both stages are built from spheroidal graphite ductile iron , delivering maximum structural stiffness, exceptional fatigue resistance, and continuous high-pressure operation up to 275 bar with peak capability up to 315 bar (4,568 psi).
Standard European 4-Bolt Rectangular Flange
Conforms to European mounting geometry (Cover Code 09/15, Centring pilot Ø50.8 mm, 128.0 × 98.5 mm hole pattern), enabling direct drop-in installation on European equipment bellhousings.
High Flow Dual Independent Delivery
Integrates two high-capacity Group 4 gear sets, delivering combined flow rates exceeding 270 l/min to independently power heavy primary and secondary circuits without mutual pressure interference.
Heavy-Duty Group 4 Through-Drive Splined Coupling
Equipped with an oversized, induction-hardened internal involute splined through-drive connection engineered to withstand heavy cumulative drive torque under continuous duty cycles.
High Volumetric Efficiency (>94%)
Precision-machined 12-tooth gear profiles and hydrostatically balanced floating thrust plates minimize internal leakage and maintain high volumetric efficiency across full temperature and pressure envelopes.
Superior Vibration & Acoustic Damping
High-density ductile iron dampens mechanical resonance and pressure ripples, delivering smooth and quiet hydraulic performance in heavy mobile cabs and indoor industrial plants.
Reference
Series Architecture & Displacements
Series Nomenclature: HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 4PT4F+4PTF 4 Bolt Rectangular Series
Front Stage (Group 4PT4F Cast Iron): Displacements from 8.0 to 92.0 cm³/rev (18 standard displacement steps).
Rear Stage (Group 4PTF Cast Iron): Displacements from 8.0 to 92.0 cm³/rev (18 standard displacement steps).
Flange Standard: European standard 4-bolt rectangular flange (Cover Code 09/15, Pilot Ø50.8 mm / 2.00").
Drive Shaft: European standard 1:8 tapered shaft (Code 12) or optional SAE splined / keyed drive shafts.
Intermediate Coupling: Dedicated heavy-duty Group 4 internal splined through-drive coupling.
Comprehensive Interchangeability & Replacement Matrix
The HENGYUHANG 4PT4F+4PTF 4 Bolt Rectangular series provides 1:1 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 4PT4F+4PTF 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 European-standard pilot centering (Ø50.8 mm / 2.00") 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 & Earthmoving: Main boom, arm, and swing circuits paired with high-flow auxiliary implement circuits on crawler excavators, large wheel loaders, and trenchers.
Mining & Drilling Machinery: Rotary drilling rigs, continuous miners, underground haul trucks, and hydraulic breaker power circuits.
Heavy Material Handling & Port Equipment: Mast lifting and high-demand hydraulic steering circuits for container reach stackers, heavy rough-terrain cranes, and counterbalance forklifts.
Forestry & Timber Processing: Log loaders, heavy timber forwarders, debarkers, and tree harvesters requiring dual high-pressure continuous flow.
Industrial Hydraulic Power Units (HPUs): Central hydraulic power stations, scrap metal compactors, high-tonnage hydraulic forging presses, and injection molding machinery.
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. 520 mm × 280 mm × 260 mm (varies with displacement pairing) |
| Gross Weight | Approx. 34.0 – 46.5 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 4PT4F+4PTF 4-Bolt Rectangular Flange Series (8.00~92.00 + 8.00~92.00 cm³/rev) is an ultra-heavy-duty, all-cast-iron dual-stage external gear pump engineered for demanding European mobile machinery and severe-duty industrial hydraulic power units requiring maximum structural rigidity, dual heavy-circuit power delivery, and standardized European mechanical mounting. Featuring a standard European 4-bolt rectangular pilot mounting flange (spigot centering pilot Ø50.8 mm / 2.000 in with 5.0 mm pilot depth, 98.5 × 128.0 mm bolt center pattern, 122.0 × 152.0 mm overall face with 4 × Ø11.0 mm clearance holes, front cover code 09), this multi-section assembly integrates two full-sized Group 4 ductile cast-iron pumps interconnected via a heavy-duty internal spline through-drive coupling. Built with 100% spheroidal graphite cast-iron front covers, gear housings, intermediate coupling adapters, and rear covers, the pump eliminates high-pressure deflection and casing deformation under continuous working pressures (p1) up to 275 bar (3,988 psi) and peak pressure spikes (p3) reaching 315 bar (4,568 psi). With 18 standardized displacement sizes available on both the front 4PT4F stage and rear 4PTF stage (8.0, 10.0, 13.0, 16.0, 18.0, 20.0, 25.0, 29.0, 32.0, 36.0, 40.0, 45.0, 51.0, 55.0, 63.0, 72.0, 81.0, and 92.0 cm³/rev), the combined dual displacement spans 16.00 up to 184.00 cm³/rev (delivering up to 276.00 L/min combined flow @ 1500 rpm). Equipped with case-hardened alloy steel integral gears, high-load hydrodynamic sleeve journal bearings, and hydrostatic axial pressure-balanced floating thrust plates, the 4PT4F+4PTF European 4-bolt rectangular series maintains volumetric efficiencies exceeding 94% under demanding continuous heavy-duty service.
| Applications
The all-cast-iron 4PT4F+4PTF European 4-bolt rectangular tandem hydraulic gear pump series is specifically engineered for severe off-highway equipment, heavy industrial power packs, and demanding multi-circuit machinery operating on European-standard PTO drive interfaces:
European Agricultural Tractors and Combine Harvesters: Direct-mounts to transmission or engine auxiliary PTO pads utilizing standard European 4-bolt rectangular mounting interfaces; the front Group 4 pump powers primary high-pressure electro-hydraulic steering and hydrostatic transmission feed systems, while the rear Group 4 pump supplies dedicated high-flow output to heavy three-point linkage lifts, front loaders, and auxiliary hydraulic remotes.
Heavy Wheel Loaders, Motor Graders, and Earthmoving Equipment: Provides independent high-pressure delivery to dual high-load hydraulic circuits; the primary cast-iron stage operates boom hoisting and bucket dump cylinder breakout circuits, while the secondary cast-iron stage drives hydraulic power steering, priority braking systems, and thermostatic cooling fan drives.
Municipal Refuse Compactors and Hook-Lift Container Trucks: Direct-coupled to European transmission PTO gearboxes; the front cast-iron pump powers main high-tonnage packing ejection blades, while the rear cast-iron pump handles heavy bin lifters, container roll-off hoists, and stabilizer outrigger cylinders simultaneously without mutual hydraulic pressure drops.
Heavy Drilling Rigs, Trenchers, and Piling Machinery: Delivers reliable high-pressure hydraulic flow to dual severe-duty circuits; one section drives the mast positioning and drill head feed cylinders, while the second section powers the continuous rotation hydraulic drive motor.
Mobile Forestry Harvesters, Forwarders, and Timber Cranes: Fully cast-iron casing design withstands extreme hydraulic shock loads and continuous vibration; the front pump feeds high-flow felling head drive motors and boom slewing systems, while the rear pump handles timber clamping arms and hydraulic cooling systems.
High-Low Industrial Hydraulic Presses and Shears: Functions as an energy-efficient high-low dual-delivery power unit; both stages combine for rapid low-pressure ram advance, after which the secondary stage unloads to reservoir and the primary cast-iron stage maintains high holding pressures up to 275 bar without thermal fatigue.
| Key Specifications Overview
| Parameter | Specification |
|---|---|
| Series Architecture | Heavy-Duty All-Cast-Iron Dual-Stage External Gear Pump (Group 4 Front 4PT4F + Group 4 Rear 4PTF) |
| Front Stage Displacement (4PT4F) | 8.00 ~ 92.00 cm³/rev (18 standardized sizes: 8, 10, 13, 16, 18, 20, 25, 29, 32, 36, 40, 45, 51, 55, 63, 72, 81, 92 cm³/rev) |
| Rear Stage Displacement (4PTF) | 8.00 ~ 92.00 cm³/rev (18 standardized sizes: 8, 10, 13, 16, 18, 20, 25, 29, 32, 36, 40, 45, 51, 55, 63, 72, 81, 92 cm³/rev) |
| Total Combined Displacement Range | 16.00 ~ 184.00 cm³/rev (modular dual-stage independent circuit pairing: V1 + V2) |
| Continuous Operating Pressure (p1) | 160 ~ 275 bar (2,320 ~ 3,988 psi) across both front and rear cast-iron stages depending on displacement |
| Intermittent Operating Pressure (p2) | 180 ~ 290 bar (2,610 ~ 4,205 psi) across both front and rear cast-iron stages |
| Max. Peak Pressure (p3) | 210 ~ 315 bar (3,045 ~ 4,568 psi) across both front and rear cast-iron stages |
| Operational Rotational Speed Range | Minimum speed: 350 min⁻¹; Maximum rated speed: 3000 min⁻¹ |
| Volumetric Efficiency | ≥ 94% across both stages under rated continuous pressure and fluid viscosity |
| Hydro-Mechanical Efficiency | ≥ 89% ~ 92% |
| Body and Housing Construction | 100% heavy-duty spheroidal graphite ductile cast iron: front mounting flange, front gear body, intermediate coupling body, rear gear body, and rear end cover |
| Mounting Flange Standard | European 4-bolt rectangular flange (spigot centering pilot Ø50.8 -0.01/-0.04 mm / 2.000 in, pilot depth 5.0 mm, 98.5 × 128.0 mm bolt centers with 4 × Ø11.0 mm clearance holes, face 122.0 × 152.0 mm, front cover code 09) |
| Primary Drive Shaft Specification | Standard: European 1:8 taper shaft (Ø21.6 mm, M14×1.5 threaded end, woodruff key, shaft code 12, max torque 280 Nm); Options: European 1:5 taper shaft (code 16, 320 Nm), metric straight keyed shaft (code 04/05), or SAE B 13T spline (code 01, 280 Nm) |
| Intermediate Coupling Mechanism | Heavy-duty high-tensile alloy steel internal spline through-drive coupling connecting front and rear Group 4 stages (allowable intermediate torque limit: up to 220 Nm) |
| Hydraulic Port Connections | Metric 4-bolt flanged ports (Code E01~E07), SAE 4-bolt split flange ports (Code A01~A07), or European BSPP/metric cylindrical straight threads across both stages |
| Rotation Direction | Clockwise (R / Right-Hand) standard; Counter-Clockwise (L / Left-Hand) available upon request (viewed facing drive shaft) |
| 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; Intermediate & rear cast-iron tie-rod bolts: 95 ± 5 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) | Input Power @ 250 bar (kW) | |||
|---|---|---|---|---|---|---|---|---|---|
| Continuous (p1) | Intermittent (p2) | Peak (p3) | Min. Speed | Max. Speed | |||||
| Front Primary Stage (Group 4PT4F Ductile Cast Iron Series — European 4-Bolt Rectangular Interface) | |||||||||
| 4PT4F8 | Ductile Cast Iron | 8.00 (0.488) | 200 / 2,900 | 230 / 3,335 | 250 / 3,625 | 350 | 3000 | 12.00 | 5.7 |
| 4PT4F10 | Ductile Cast Iron | 10.00 (0.610) | 200 / 2,900 | 230 / 3,335 | 250 / 3,625 | 350 | 3000 | 15.00 | 7.1 |
| 4PT4F13 | Ductile Cast Iron | 13.00 (0.793) | 200 / 2,900 | 230 / 3,335 | 250 / 3,625 | 350 | 3000 | 19.50 | 9.2 |
| 4PT4F16 | Ductile Cast Iron | 16.00 (0.976) | 200 / 2,900 | 230 / 3,335 | 250 / 3,625 | 350 | 3000 | 24.00 | 11.3 |
| 4PT4F18 | Ductile Cast Iron | 18.00 (1.098) | 200 / 2,900 | 230 / 3,335 | 250 / 3,625 | 350 | 3000 | 27.00 | 12.8 |
| 4PT4F20 | Ductile Cast Iron | 20.00 (1.220) | 230 / 3,335 | 250 / 3,625 | 280 / 4,060 | 350 | 3000 | 30.00 | 16.3 |
| 4PT4F25 | Ductile Cast Iron | 25.00 (1.526) | 230 / 3,335 | 250 / 3,625 | 280 / 4,060 | 350 | 3000 | 37.50 | 20.4 |
| 4PT4F29 | Ductile Cast Iron | 29.00 (1.770) | 230 / 3,335 | 250 / 3,625 | 280 / 4,060 | 350 | 3000 | 43.50 | 23.7 |
| 4PT4F32 | Ductile Cast Iron | 32.00 (1.953) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 350 | 3000 | 48.00 | 28.4 |
| 4PT4F36 | Ductile Cast Iron | 36.00 (2.197) | 275 / 3,988 | 290 / 4,205 | 315 / 4,568 | 350 | 3000 | 54.00 | 35.2 |
| 4PT4F40 | Ductile Cast Iron | 40.00 (2.441) | 275 / 3,988 | 290 / 4,205 | 315 / 4,568 | 350 | 3000 | 60.00 | 39.1 |
| 4PT4F45 | Ductile Cast Iron | 45.00 (2.746) | 275 / 3,988 | 290 / 4,205 | 315 / 4,568 | 350 | 3000 | 67.50 | 44.0 |
| 4PT4F51 | Ductile Cast Iron | 51.00 (3.112) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 350 | 3000 | 76.50 | 45.2 |
| 4PT4F55 | Ductile Cast Iron | 55.00 (3.356) | 230 / 3,335 | 250 / 3,625 | 280 / 4,060 | 350 | 3000 | 82.50 | 44.8 |
| 4PT4F63 | Ductile Cast Iron | 63.00 (3.845) | 230 / 3,335 | 250 / 3,625 | 280 / 4,060 | 350 | 3000 | 94.50 | 51.4 |
| 4PT4F72 | Ductile Cast Iron | 72.00 (4.394) | 200 / 2,900 | 230 / 3,335 | 250 / 3,625 | 350 | 3000 | 108.00 | 51.1 |
| 4PT4F81 | Ductile Cast Iron | 81.00 (4.943) | 200 / 2,900 | 230 / 3,335 | 250 / 3,625 | 350 | 3000 | 121.50 | 57.5 |
| 4PT4F92 | Ductile Cast Iron | 92.00 (5.614) | 160 / 2,320 | 180 / 2,610 | 210 / 3,045 | 350 | 3000 | 138.00 | 65.3 |
| Rear Secondary Stage (Group 4PTF Ductile Cast Iron Series) | |||||||||
| 4PTF08 | Ductile Cast Iron | 8.00 (0.488) | 200 / 2,900 | 230 / 3,335 | 250 / 3,625 | 350 | 3000 | 12.00 | 5.7 |
| 4PTF10 | Ductile Cast Iron | 10.00 (0.610) | 200 / 2,900 | 230 / 3,335 | 250 / 3,625 | 350 | 3000 | 15.00 | 7.1 |
| 4PTF13 | Ductile Cast Iron | 13.00 (0.793) | 200 / 2,900 | 230 / 3,335 | 250 / 3,625 | 350 | 3000 | 19.50 | 9.2 |
| 4PTF16 | Ductile Cast Iron | 16.00 (0.976) | 200 / 2,900 | 230 / 3,335 | 250 / 3,625 | 350 | 3000 | 24.00 | 11.3 |
| 4PTF18 | Ductile Cast Iron | 18.00 (1.098) | 200 / 2,900 | 230 / 3,335 | 250 / 3,625 | 350 | 3000 | 27.00 | 12.8 |
| 4PTF20 | Ductile Cast Iron | 20.00 (1.220) | 230 / 3,335 | 250 / 3,625 | 280 / 4,060 | 350 | 3000 | 30.00 | 16.3 |
| 4PTF25 | Ductile Cast Iron | 25.00 (1.526) | 230 / 3,335 | 250 / 3,625 | 280 / 4,060 | 350 | 3000 | 37.50 | 20.4 |
| 4PTF29 | Ductile Cast Iron | 29.00 (1.770) | 230 / 3,335 | 250 / 3,625 | 280 / 4,060 | 350 | 3000 | 43.50 | 23.7 |
| 4PTF32 | Ductile Cast Iron | 32.00 (1.953) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 350 | 3000 | 48.00 | 28.4 |
| 4PTF36 | Ductile Cast Iron | 36.00 (2.197) | 275 / 3,988 | 290 / 4,205 | 315 / 4,568 | 350 | 3000 | 54.00 | 35.2 |
| 4PTF40 | Ductile Cast Iron | 40.00 (2.441) | 275 / 3,988 | 290 / 4,205 | 315 / 4,568 | 350 | 3000 | 60.00 | 39.1 |
| 4PTF45 | Ductile Cast Iron | 45.00 (2.746) | 275 / 3,988 | 290 / 4,205 | 315 / 4,568 | 350 | 3000 | 67.50 | 44.0 |
| 4PTF51 | Ductile Cast Iron | 51.00 (3.112) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 350 | 3000 | 76.50 | 45.2 |
| 4PTF55 | Ductile Cast Iron | 55.00 (3.356) | 230 / 3,335 | 250 / 3,625 | 280 / 4,060 | 350 | 3000 | 82.50 | 44.8 |
| 4PTF63 | Ductile Cast Iron | 63.00 (3.845) | 230 / 3,335 | 250 / 3,625 | 280 / 4,060 | 350 | 3000 | 94.50 | 51.4 |
| 4PTF72 | Ductile Cast Iron | 72.00 (4.394) | 200 / 2,900 | 230 / 3,335 | 250 / 3,625 | 350 | 3000 | 108.00 | 51.1 |
| 4PTF81 | Ductile Cast Iron | 81.00 (4.943) | 200 / 2,900 | 230 / 3,335 | 250 / 3,625 | 350 | 3000 | 121.50 | 57.5 |
| 4PTF92 | Ductile Cast Iron | 92.00 (5.614) | 160 / 2,320 | 180 / 2,610 | 210 / 3,045 | 350 | 3000 | 138.00 | 65.3 |
| Mechanical Drive Guidelines and Torque Limitations
| Mechanical Parameter | Engineering Specification and Limit |
|---|---|
| Primary Shaft Drive Torque Limit (T1_max) | European 1:8 Taper Shaft (shaft code 12): 280 Nm (2,478 lbf in); European 1:5 Taper Shaft (code 16): 320 Nm (2,832 lbf in); Metric Keyed Shaft (code 04/05): 280 Nm; SAE B 13-Tooth Spline (code 01): 280 Nm |
| Intermediate Coupling Torque Limit (T2_max) | 220 Nm (1,947 lbf in) max torque transfer capacity for heavy-duty internal spline through-drive coupling connecting Group 4 front and Group 4 rear 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) ≤ 220 Nm (safely protects through-drive intermediate internal spline coupling) |
| Stage Sizing and Sequencing Engineering Rule | When pairing different displacements, select the primary front stage (4PT4F) with displacement equal to or larger than the rear secondary stage (4PTF) to optimize driveline stress distribution |
| European 4-Bolt Rectangular Mounting Flange, Shaft and Port Details
| Interface Feature | Technical Standard and Dimension |
|---|---|
| Mounting Flange Standard | European 4-bolt rectangular flange (spigot centering pilot Ø50.8 -0.01/-0.04 mm / 2.000 in, pilot depth 5.0 mm, front cover code 09) |
| Mounting Hole Pattern Dimensions | Rectangular bolt centers: 98.5 mm horizontal × 128.0 mm vertical (3.878 × 5.039 in) with 4 × Ø11.0 mm clearance holes, overall rectangular face 122.0 × 152.0 mm (4.803 × 5.984 in) |
| Primary Drive Shaft (Standard) | European 1:8 Taper Shaft: major diameter Ø21.6 mm, M14×1.5 threaded end with lock nut, woodruff key (shaft code 12, max allowable drive torque 280 Nm) |
| Primary Drive Shaft (Optional) | European 1:5 Taper Shaft (Ø25.0 mm, M16×1.5, code 16, 320 Nm); Metric straight keyed shaft (code 04/05); or SAE B 13T involute spline (code 01, 280 Nm) |
| Intermediate Coupling Shaft | Heavy-duty alloy steel internal spline through-drive coupling connecting Group 4 and Group 4 stages (allowable intermediate torque: up to 220 Nm) |
| Front Stage Port Connections (4PT4F) | Metric 4-bolt flanged ports (Code E01~E07), SAE 4-bolt split flange ports (Code A01~A07), or European BSPP/metric cylindrical straight threads |
| Rear Stage Port Connections (4PTF) | Metric 4-bolt flanged ports (Code E01~E07), SAE 4-bolt split flange ports (Code A01~A07), or European BSPP/metric cylindrical straight threads |
| Standard Interchangeability and Mounting Compliance
| Standardization Category | Technical Compliance and Interchangeability Characteristics |
|---|---|
| Mounting Interface Standard | Conforms fully to European Group 4 rectangular mounting standards (centering pilot Ø50.8 mm, 98.5 × 128.0 mm 4-bolt rectangular pattern, face 122 × 152 mm), providing direct physical interchangeability across European agricultural tractors and industrial power unit drive pads. |
| Drive Shaft Standardization | Standard 1:8 European taper shaft (M14×1.5) conforms to European mobile hydraulic drive standards, enabling direct coupling to standard European PTO adapters and pulley hubs without modification. |
| Hydraulic Port Compatibility | Porting options include standard metric 4-bolt flanged ports and SAE J518 / ISO 6162-1 (Code 61) split flange interfaces, providing complete plumbing compatibility with international standard hydraulic piping lines. |
| All-Cast-Iron Tandem Replacement | Functions as a direct drop-in replacement for standard European Group 4 / Group 3 heavy-duty all-cast-iron dual gear pumps operating on agricultural tractors, wheel loaders, municipal refuse vehicles, and high-pressure mobile power units. |
4PTF Series — Technical Specifications
| Model | Displacement (cm³/rev) | Flow Rate @1500RPM (l/min) | P1 (bar) | P2 (bar) | P3 (bar) | Max Speed (rpm) | Min Speed (rpm) | Input Power @250bar & 1500rpm (kW) |
|---|---|---|---|---|---|---|---|---|
| 4PTF08 | 8 | 12 | 200 | 230 | 250 | 3000 | 350 | 5.7 |
| 4PTF10 | 10 | 15 | 200 | 230 | 250 | 3000 | 350 | 7.1 |
| 4PTF13 | 13 | 19.5 | 200 | 230 | 250 | 3000 | 350 | 9.2 |
| 4PTF16 | 16 | 24 | 200 | 230 | 250 | 3000 | 350 | 11.4 |
| 4PTF18 | 18 | 27 | 200 | 230 | 250 | 3000 | 350 | 12.8 |
| 4PTF20 | 20 | 30 | 230 | 250 | 280 | 3000 | 350 | 14.2 |
| 4PTF25 | 25 | 37.5 | 230 | 250 | 280 | 3000 | 350 | 17.8 |
| 4PTF29 | 29 | 43.5 | 230 | 250 | 280 | 3000 | 350 | 20.6 |
| 4PTF32 | 32 | 48 | 250 | 275 | 300 | 3000 | 350 | 22.7 |
| 4PTF36 | 36 | 54 | 275 | 290 | 315 | 3000 | 350 | 25.6 |
| 4PTF40 | 40 | 60 | 275 | 290 | 315 | 3000 | 350 | 28.4 |
| 4PTF45 | 45 | 67.5 | 275 | 290 | 315 | 3000 | 350 | 32 |
| 4PTF51 | 51 | 76.5 | 250 | 275 | 300 | 3000 | 350 | 36.2 |
| 4PTF55 | 55 | 82.5 | 230 | 250 | 280 | 3000 | 350 | 39.6 |
| 4PTF63 | 63 | 94.5 | 230 | 250 | 280 | 3000 | 350 | 44.7 |
| 4PTF72 | 72 | 108 | 200 | 230 | 250 | 3000 | 350 | 51.1 |
| 4PTF81 | 81 | 121.5 | 200 | 230 | 250 | 3000 | 350 | 57.5 |
| 4PTF92 | 92 | 138 | 160 | 180 | 210 | 3000 | 350 | 65.3 |
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