Gear pump
Tandem Cast Iron Hydraulic Gear Pump 4PT2F+2PDF SAE B 2/4-Bolt
Engineered with a high-strength ductile cast iron front body and a versatile SAE B universal 2/4-bolt combination flange, 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 North American and global 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 universal SAE B 2/4-bolt mounting pattern allows direct retrofit onto either 2-bolt or 4-bolt pilot pads without structural alteration.
| Key Technical Specifications
Product Model: Hengyuhang Tandem Cast Iron Hydraulic Gear Pump 4PT2F+2PDF SAE B 2/4-Bolt 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
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| Overview of HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 4PT2F+2PDF SAE B 2/4-Bolt Series
The HENGYUHANG 4PT2F+2PDF SAE B 2/4-Bolt Series is an advanced cross-frame tandem external gear pump combining a heavy-duty Group 4 cast iron front stage (4PT2F) with a versatile Group 2 rear stage (2PDF). The 4PT2F front stage is cast from premium spheroidal graphite ductile iron (QT500), delivering supreme mechanical fatigue resistance, bore stability, and high-pressure retention up to 315 bar (4,568 psi). It incorporates an induction-hardened internal involute splined through-shaft coupling that smoothly drives the rear 2PDF stage without parasitic deflection. Featuring a universal combination SAE B 2/4-bolt mounting flange (Centring pilot Ø 101.6 mm / 4.00" h8, 2-bolt diagonal spacing 146.0 mm / 5.75", 4-bolt pattern 89.7 × 114.3 mm / 3.53" × 4.50", Cover Code 00) and standard SAE splined or keyed drive shafts (Shaft Code 01/02/06), this series delivers dual independent hydraulic circuits from a single prime mover, offering 1:1 OEM drop-in interchangeability across 27+ international brands.
| Dimension of HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 4PT2F+2PDF SAE B 2/4-Bolt Series
| Interface Data Needed with the Drawing (Dimensional Reference Table)
| Interface Parameter | Engineering Specification & Dimensional Standard | Notes / Tolerance |
|---|---|---|
| Front Mounting Flange | SAE B Combination 2/4-Bolt oval/rectangular flange (Catalogue Code 00) | Universal dual-mounting pad to SAE J744 / ISO 3019-1 |
| Flange Centring Pilot | Ø 101.6 mm (4.00 in) | Pilot tolerance h8 (-0.012 / -0.054 mm), pilot depth 9.5 mm |
| 2-Bolt Mounting Pattern | 146.0 mm (5.75 in) diagonal center-to-center spacing | Precision CNC-machined 2-bolt mounting holes |
| 4-Bolt Mounting Pattern | 89.7 mm × 114.3 mm (3.53 in × 4.50 in) rectangular pattern | Standard 4-bolt SAE B pattern for rigid industrial mounting |
| Mounting Bolt Holes | 4 × Ø 14.3 mm (9/16 in) clearance through-holes | Suitable for 1/2"-13 UNC or M12/M14 high-tensile grade 10.9 bolts |
| Primary Drive Shaft | SAE 13-tooth involute splined shaft (Catalogue Code 01) | 16/32 DP, 30° pressure angle, flat root side fit, major Ø 21.8 mm |
| Alternative Drive Shafts | SAE 15T spline (Code 02), SAE 7/8" keyed (Code 06), SAE 1" keyed (Code 03) | Available upon customer installation requirements |
| Intermediate Coupling | High-torque internal involute splined through-drive coupling | Connects 4PT2F front drive gear to 2PDF rear shaft |
| Front Stage Ports (4PT2F) | 4-bolt split flange (SAE Code 61 / Metric) or SAE O-ring boss / BSPP | Code A04/A05, E04/E05, G06/G07 per displacement |
| Rear Stage Ports (2PDF) | SAE O-ring boss (UNF/UN), BSPP threaded, or European flanged ports | Separate suction or shared common suction manifold |
| 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 | 100 – 115 N·m (1/2" grade 8 / M12 grade 10.9 bolts) | Cross-tightened in two stages |
| Pump Installation Specifications HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 4PT2F+2PDF SAE B 2/4-Bolt 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) | 00 = SAE B 2/4-bolt combination flange (Pilot Ø 101.6 mm, 146 mm 2-bolt / 89.7×114.3 mm 4-bolt); 01 = SAE B 2-bolt; 02 = SAE C 4-bolt; 09 = European 4-bolt rectangular |
| S (Drive Shaft Code) | 01 = SAE 13T spline (Ø 21.8 mm); 02 = SAE 15T spline (Ø 25 mm); 06 = SAE 7/8" straight keyed (Ø 22.22 mm); 03 = SAE 1" straight keyed (Ø 25.4 mm); 12 = European 1:8 tapered |
| P1/P2 (Inlet/Outlet Port Dimensions) | Flanged fittings SAE (A), metric (E), 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 | 00 | SAE B combination 2/4-bolt flange (Ø 101.6 mm pilot, universal 2-bolt and 4-bolt pads) |
| Drive Shaft | 01 | SAE 13-tooth involute splined shaft (16/32 DP, 7/8" nominal OD) |
| Port Dimensions | A05A04 / G04G03 | Front stage SAE split flange ports / Rear stage BSPP threaded 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 SAE B 2/4-Bolt 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 Fatigue Durability up to 315 bar
The 4PT2F front stage is cast from spheroidal graphite ductile iron (QT500), delivering supreme structural stiffness that resists cyclic pressure pulsation and bore expansion up to 315 bar (4,568 psi).
Universal SAE B Combination 2/4-Bolt Mount
Features a dual-geometry flange (Cover Code 00) accommodating both 2-bolt oval and 4-bolt rectangular mounting pads (Pilot Ø101.6 mm / 4.00"), maximizing inventory flexibility across diverse OEM fleets.
Dual-Circuit Independent Power Density
Delivers two independent hydraulic delivery circuits from a single prime mover take-off—primary high flow up to 138 l/min and auxiliary flow up to 45 l/min.
Heavy-Duty Through-Drive Splined Coupling
Incorporates an induction-hardened internal involute splined through-shaft coupling engineered to transmit the full downstream drive torque without torsional flexure or premature wear.
High Volumetric Efficiency (>94%)
Micro-finished high-precision gear pairs and hydrostatically balanced floating pressure plates eliminate internal leakage and maintain consistent volumetric efficiency across high working pressures.
Low Noise & Vibration Damping
High-density ductile iron absorbs mechanical noise and fluid pulsation, operating significantly quieter than conventional aluminum pumps in demanding mobile operator environments.
Reference
Series Architecture & Displacements
Series Nomenclature: HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 4PT2F+2PDF SAE B 2/4-Bolt 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: SAE B Combination 2/4-Bolt mount (Cover Code 00) with SAE 13T spline (Code 01) or SAE keyed shafts.
Through-Drive Coupling: Dedicated intermediate splined coupling connecting front and rear stages.
Comprehensive Interchangeability & Replacement Matrix
The HENGYUHANG 4PT2F+2PDF SAE B 2/4-Bolt 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 SAE B 2/4-Bolt 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 SAE-standard pilot centering (Ø101.6 mm / 4.00") and standardized 13-tooth involute splined 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 SAE B 2/4-Bolt Combination Flange Series (8.00~92.00 + 4.00~30.00 cm³/rev) is a high-performance, heavy-duty hybrid dual-stage external gear pump engineered for severe mobile equipment circuits and industrial hydraulic power units requiring maximum casing rigidity, multi-circuit versatility, and universal mounting flexibility. Featuring an industry-standard SAE "B" combination 2-bolt and 4-bolt pilot mounting flange (spigot centering pilot Ø101.6 mm / 4.000 in with 9.4 mm / 0.370 in pilot depth, 90.0 × 90.0 mm 4-bolt square pattern, and 118.0 mm overall face with 4 × Ø14.3 mm mounting clearance holes, front cover code 00), this multi-section assembly integrates a high-strength spheroidal graphite ductile cast-iron front pump (4PT2F) with an extruded aluminum alloy Group 2 rear pump (2PDF), interconnected via a high-tensile alloy steel through-drive internal spline coupling shaft. The front cast-iron stage eliminates structural deflection and thermal fatigue under continuous working pressures (p1) up to 275 bar (3,988 psi) and peak pressure spikes (p3) reaching 315 bar (4,568 psi), while the rear aluminum stage provides agile auxiliary hydraulic flow with continuous operating pressures up to 250 bar (3,625 psi). Standardized across 18 displacement sizes for the front cast-iron 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) and 10 displacement sizes for the rear aluminum 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 total combined displacement spans 12.00 up to 122.00 cm³/rev (delivering up to 183.00 L/min combined flow @ 1500 rpm). Equipped with case-hardened alloy steel integral gears and hydrostatic axial pressure-balanced floating wear plates across both sections, the 4PT2F+2PDF SAE B 2/4-bolt combination series maintains over 94% volumetric efficiency under demanding continuous duty.
| Applications
The 4PT2F+2PDF SAE B 2/4-bolt combination hybrid tandem cast-iron hydraulic gear pump series is specifically engineered for severe off-highway equipment, commercial utility vehicles, and split-circuit industrial machinery:
Agricultural Tractors, Combines, and Field Sprayers: Direct-mounts to transmission or engine auxiliary PTO pads utilizing either SAE B 2-bolt or 4-bolt interface patterns; the primary cast-iron stage drives high-pressure front-end loader cylinders, steering systems, and hydraulic drive motors, while the secondary aluminum stage powers auxiliary hitch lift cylinders and electro-hydraulic implement valves.
Rough-Terrain Forklifts, Telehandlers, and Aerial Work Platforms: The heavy cast-iron front pump withstands severe cyclic holding pressures and boom hoisting breakout loads, while the secondary aluminum pump powers auxiliary mast tilt, chassis leveling, and power steering circuits.
Medium Wheel Loaders, Mini Excavators, and Backhoe Loaders: Powers dual independent hydraulic circuits; the front cast-iron pump handles main boom and bucket cylinder breakout cycles, while the rear aluminum pump operates thermostatically controlled hydraulic cooling fans and pilot control circuits.
Municipal Refuse Compactors and Roll-Off Trucks: Driven directly via transmission Chelsea or Muncie PTO shafts; the front stage drives high-pressure packing blade rams and container hoist cylinders, while the secondary stage operates automated bin tippers, tailgate latches, and auxiliary outriggers.
High-Low Industrial Hydraulic Presses and Balers: Functions as an energy-efficient dual-delivery power unit; both stages combine for rapid low-pressure cylinder approach, after which the secondary stage unloads to reservoir and the front cast-iron stage maintains high tonnage holding pressures up to 275 bar without thermal degradation.
Mobile Forestry Chippers, Log Splitters, and Forwarders: Provides continuous high-pressure flow to timber grab jaws and infeed roller hydraulic motors on the front stage, while the rear stage operates hydraulic oil cooler fan drives and steering cylinders.
| 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) | 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 (2PDF) | 4.00 ~ 30.00 cm³/rev (10 standardized 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 | 12.00 ~ 122.00 cm³/rev (modular dual-stage independent circuit pairing: V1 + V2) |
| Continuous Operating Pressure (p1) | Front stage: 160 ~ 275 bar (2,320 ~ 3,988 psi); Rear stage: 170 ~ 250 bar (2,465 ~ 3,625 psi) |
| Intermittent Operating Pressure (p2) | Front stage: 180 ~ 290 bar (2,610 ~ 4,205 psi); Rear stage: 190 ~ 275 bar (2,755 ~ 3,988 psi) |
| Max. Peak Pressure (p3) | Front stage: 210 ~ 315 bar (3,045 ~ 4,568 psi); Rear stage: 210 ~ 300 bar (3,045 ~ 4,350 psi) |
| Combined Rotational Speed Range | Operational minimum: 500 ~ 700 min⁻¹ (governed by rear stage hydrodynamic threshold); Maximum: 2500 ~ 3000 min⁻¹ |
| Volumetric Efficiency | ≥ 94% across both stages under rated operating pressure and fluid viscosity |
| Hydro-Mechanical Efficiency | ≥ 89% ~ 92% |
| Body and Housing Construction | Hybrid construction: high-density spheroidal graphite ductile cast-iron front flange, front body, and intermediate adapter; extruded aluminum alloy rear body and end cover |
| Mounting Flange Standard | SAE "B" 2/4-bolt combination flange (spigot centering pilot Ø101.6 -0.012/-0.047 mm / 4.000 in, pilot depth 9.4 mm / 0.370 in, 90.0 × 90.0 mm 4-bolt square pattern with 4 × Ø14.3 mm clearance holes, front cover code 00) |
| Primary Drive Shaft Specification | Standard: SAE B 13-tooth involute spline (16/32 DP, 30° pressure angle, shaft code 01, max torque 280 Nm); Options: SAE 1 in straight keyed (code 03, 280 Nm), SAE 7/8 in straight keyed (code 06, 220 Nm), or European 1:8 taper (code 12) |
| Intermediate Coupling Mechanism | High-tensile alloy steel internal spline through-drive intermediate coupling connecting Group 4 and Group 2 stages (allowable intermediate torque limit: up to 140 Nm) |
| Hydraulic Port Connections | Front stage: Metric 4-bolt flanged ports (Code E01~E07), SAE 4-bolt split flange ports (Code A01~A07), or SAE/BSPP threaded ports; Rear stage: European 4-bolt flanged or BSPP/SAE threaded ports |
| 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; Rear aluminum tie-rod bolts: 60 ± 4 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 — SAE B 2/4-Bolt Interface) | ||||||||
| 4PT2F08 | Ductile Cast Iron | 8.00 (0.488) | 200 / 2,900 | 230 / 3,335 | 250 / 3,625 | 350 | 3000 | 12.00 |
| 4PT2F10 | Ductile Cast Iron | 10.00 (0.610) | 200 / 2,900 | 230 / 3,335 | 250 / 3,625 | 350 | 3000 | 15.00 |
| 4PT2F13 | Ductile Cast Iron | 13.00 (0.793) | 200 / 2,900 | 230 / 3,335 | 250 / 3,625 | 350 | 3000 | 19.50 |
| 4PT2F16 | Ductile Cast Iron | 16.00 (0.976) | 200 / 2,900 | 230 / 3,335 | 250 / 3,625 | 350 | 3000 | 24.00 |
| 4PT2F18 | Ductile Cast Iron | 18.00 (1.098) | 200 / 2,900 | 230 / 3,335 | 250 / 3,625 | 350 | 3000 | 27.00 |
| 4PT2F20 | Ductile Cast Iron | 20.00 (1.220) | 230 / 3,335 | 250 / 3,625 | 280 / 4,060 | 350 | 3000 | 30.00 |
| 4PT2F25 | Ductile Cast Iron | 25.00 (1.526) | 230 / 3,335 | 250 / 3,625 | 280 / 4,060 | 350 | 3000 | 37.50 |
| 4PT2F29 | Ductile Cast Iron | 29.00 (1.770) | 230 / 3,335 | 250 / 3,625 | 280 / 4,060 | 350 | 3000 | 43.50 |
| 4PT2F32 | Ductile Cast Iron | 32.00 (1.953) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 350 | 3000 | 48.00 |
| 4PT2F36 | Ductile Cast Iron | 36.00 (2.197) | 275 / 3,988 | 290 / 4,205 | 315 / 4,568 | 350 | 3000 | 54.00 |
| 4PT2F40 | Ductile Cast Iron | 40.00 (2.441) | 275 / 3,988 | 290 / 4,205 | 315 / 4,568 | 350 | 3000 | 60.00 |
| 4PT2F45 | Ductile Cast Iron | 45.00 (2.746) | 275 / 3,988 | 290 / 4,205 | 315 / 4,568 | 350 | 3000 | 67.50 |
| 4PT2F51 | Ductile Cast Iron | 51.00 (3.112) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 350 | 3000 | 76.50 |
| 4PT2F55 | Ductile Cast Iron | 55.00 (3.356) | 230 / 3,335 | 250 / 3,625 | 280 / 4,060 | 350 | 3000 | 82.50 |
| 4PT2F63 | Ductile Cast Iron | 63.00 (3.845) | 230 / 3,335 | 250 / 3,625 | 280 / 4,060 | 350 | 3000 | 94.50 |
| 4PT2F72 | Ductile Cast Iron | 72.00 (4.394) | 200 / 2,900 | 230 / 3,335 | 250 / 3,625 | 350 | 3000 | 108.00 |
| 4PT2F81 | Ductile Cast Iron | 81.00 (4.943) | 200 / 2,900 | 230 / 3,335 | 250 / 3,625 | 350 | 3000 | 121.50 |
| 4PT2F92 | Ductile Cast Iron | 92.00 (5.614) | 160 / 2,320 | 180 / 2,610 | 210 / 3,045 | 350 | 3000 | 138.00 |
| 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 Drive Torque Limit (T1_max) | SAE B 13-Tooth Involute Spline (shaft code 01): 280 Nm (2,478 lbf in); SAE 1 in Keyed Shaft (code 03): 280 Nm; SAE 7/8 in Keyed Shaft (code 06): 220 Nm (1,947 lbf in) |
| 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 (safely protects through-drive intermediate spline coupling) |
| Stage Sequencing Engineering Rule | Always position the heavy-duty ductile cast-iron stage at the front (4PT2F) and the aluminum auxiliary stage at the rear (2PDF) to safeguard driveline structural integrity |
| SAE B 2/4-Bolt Mounting Flange, Shaft and Port Details
| Interface Feature | Technical Standard and Dimension |
|---|---|
| Mounting Flange Standard | SAE "B" 2/4-bolt combination flange (spigot centering pilot Ø101.6 -0.012/-0.047 mm / 4.000 in, pilot depth 9.4 mm / 0.370 in, front cover code 00) |
| Mounting Hole Pattern Dimensions | Dual-compatibility pattern: 90.0 × 90.0 mm (3.543 × 3.543 in) square center-to-center spacing with 4 × Ø14.3 mm clearance holes, overall square face 118.0 × 118.0 mm (4.646 × 4.646 in) |
| Primary Drive Shaft (Standard) | SAE B Involute Spline: 13 Teeth, 16/32 Pitch, 30° pressure angle, major diameter Φ21.8 mm (shaft code 01, max allowable drive torque 280 Nm) |
| Primary Drive Shaft (Optional) | SAE 1 in straight keyed (Φ25.4 mm, key 6.3×6.3×31.7 mm, code 03, 280 Nm); SAE 7/8 in straight keyed (Φ22.22 mm, key 6.3×6.3×25.4 mm, code 06, 220 Nm); or 1:8 taper shaft (code 12) |
| Intermediate Coupling Shaft | Heavy-duty alloy steel internal spline through-drive coupling connecting Group 4 and Group 2 stages (allowable intermediate torque: up to 140 Nm) |
| Front Stage Port Connections (4PT2F) | Metric 4-bolt flanged ports (Code E01~E07), SAE 4-bolt split flange ports (Code A01~A07), or SAE/BSPP cylindrical straight threads |
| Rear Stage Port Connections (2PDF) | European 4-bolt flanged ports (G 3/4 inlet, G 1/2 outlet) or BSPP/SAE straight threads |
| Standard Interchangeability and Mounting Compliance
| Standardization Category | Technical Compliance and Interchangeability Characteristics |
|---|---|
| Mounting Interface Standard | Conforms fully to international SAE J744 mounting standards for SAE B combination interfaces (centering pilot Ø101.6 mm, 90 × 90 mm 4-bolt square pattern), providing universal physical interchangeability across both 2-bolt and 4-bolt machine mounting pads. |
| Drive Shaft Standardization | Standard 13-tooth involute spline conforms to SAE J498 / ANSI B92.1 (16/32 DP, 30° pressure angle), enabling direct coupling to standard SAE B hydraulic drive adapters and PTO shafts without modification. |
| Hydraulic Port Compatibility | Porting options include standard 4-bolt split flange interfaces conforming to SAE J518 / ISO 6162-1 (Code 61) and metric flanged ports, providing full plumbing compatibility with international standard hydraulic piping lines. |
| Hybrid Dual-Stage Replacement | Functions as a direct drop-in replacement for standard Group 4 cast-iron front and Group 2 aluminum rear hybrid tandem gear pumps operating on agricultural tractors, telehandlers, refuse trucks, and mobile power units. |
| 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 — SAE B 2/4-Bolt Interface) | ||||||||
| 4PT2F08 | Ductile Cast Iron | 8.00 (0.488) | 200 / 2,900 | 230 / 3,335 | 250 / 3,625 | 350 | 3000 | 12.00 |
| 4PT2F10 | Ductile Cast Iron | 10.00 (0.610) | 200 / 2,900 | 230 / 3,335 | 250 / 3,625 | 350 | 3000 | 15.00 |
| 4PT2F13 | Ductile Cast Iron | 13.00 (0.793) | 200 / 2,900 | 230 / 3,335 | 250 / 3,625 | 350 | 3000 | 19.50 |
| 4PT2F16 | Ductile Cast Iron | 16.00 (0.976) | 200 / 2,900 | 230 / 3,335 | 250 / 3,625 | 350 | 3000 | 24.00 |
| 4PT2F18 | Ductile Cast Iron | 18.00 (1.098) | 200 / 2,900 | 230 / 3,335 | 250 / 3,625 | 350 | 3000 | 27.00 |
| 4PT2F20 | Ductile Cast Iron | 20.00 (1.220) | 230 / 3,335 | 250 / 3,625 | 280 / 4,060 | 350 | 3000 | 30.00 |
| 4PT2F25 | Ductile Cast Iron | 25.00 (1.526) | 230 / 3,335 | 250 / 3,625 | 280 / 4,060 | 350 | 3000 | 37.50 |
| 4PT2F29 | Ductile Cast Iron | 29.00 (1.770) | 230 / 3,335 | 250 / 3,625 | 280 / 4,060 | 350 | 3000 | 43.50 |
| 4PT2F32 | Ductile Cast Iron | 32.00 (1.953) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 350 | 3000 | 48.00 |
| 4PT2F36 | Ductile Cast Iron | 36.00 (2.197) | 275 / 3,988 | 290 / 4,205 | 315 / 4,568 | 350 | 3000 | 54.00 |
| 4PT2F40 | Ductile Cast Iron | 40.00 (2.441) | 275 / 3,988 | 290 / 4,205 | 315 / 4,568 | 350 | 3000 | 60.00 |
| 4PT2F45 | Ductile Cast Iron | 45.00 (2.746) | 275 / 3,988 | 290 / 4,205 | 315 / 4,568 | 350 | 3000 | 67.50 |
| 4PT2F51 | Ductile Cast Iron | 51.00 (3.112) | 250 / 3,625 | 275 / 3,988 | 300 / 4,350 | 350 | 3000 | 76.50 |
| 4PT2F55 | Ductile Cast Iron | 55.00 (3.356) | 230 / 3,335 | 250 / 3,625 | 280 / 4,060 | 350 | 3000 | 82.50 |
| 4PT2F63 | Ductile Cast Iron | 63.00 (3.845) | 230 / 3,335 | 250 / 3,625 | 280 / 4,060 | 350 | 3000 | 94.50 |
| 4PT2F72 | Ductile Cast Iron | 72.00 (4.394) | 200 / 2,900 | 230 / 3,335 | 250 / 3,625 | 350 | 3000 | 108.00 |
| 4PT2F81 | Ductile Cast Iron | 81.00 (4.943) | 200 / 2,900 | 230 / 3,335 | 250 / 3,625 | 350 | 3000 | 121.50 |
| 4PT2F92 | Ductile Cast Iron | 92.00 (5.614) | 160 / 2,320 | 180 / 2,610 | 210 / 3,045 | 350 | 3000 | 138.00 |
| 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 |
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