Gear pump
Tandem Cast Iron Hydraulic Gear Pump 3PT3F+3PTF SAE B 2-Bolt
Hengyuhang Tandem Cast Iron Hydraulic Gear Pump 3PT3F+3PTF SAE B 2-Bolt Series combines dual heavy-duty Group 3 cast iron pumping stages in an SAE B 2-bolt mount, providing extreme structural fatigue endurance, high dual-circuit flow, and peak pressure capability up to 320 bar.
| Applications of Hengyuhang Tandem Cast Iron Hydraulic Gear Pump 3PT3F+3PTF SAE B 2-Bolt Series
Engineered for high-tonnage mobile construction and severe-duty agricultural machinery, this dual cast iron tandem pump drives two independent high-flow hydraulic circuits from a single prime mover power take-off. It provides rugged, continuous fluid power for mid-to-large crawler excavators, heavy wheel loaders, combine harvesters, articulated dump trucks, mining support equipment, and stationary high-power industrial hydraulic presses operating under severe cyclic pressure shocks.
| Key Technical Specifications
Product Model: Hengyuhang Tandem Cast Iron Hydraulic Gear Pump 3PT3F+3PTF SAE B 2-Bolt Series
Brand Replacement: CASAPPA, Rexroth, Marzocchi, Parker OEM or as requested.
Displacement: Front Stage (Group 3PT3F Cast Iron): 20 to 71 cm³/rev; Rear Stage (Group 3PTF Cast Iron): 20 to 71 cm³/rev
Rotation Direction: Clockwise (D), counter-clockwise (S)
Speed Range: Min. speed 500 to 600 r/min; Max. speed 2500 to 3500 r/min
Peak Pressure: Up to 320 bar (4,640 psi)
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| Overview of HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 3PT3F+3PTF SAE B 2-Bolt Series
The HENGYUHANG 3PT3F+3PTF SAE B 2-Bolt Series provides an engineered all-cast-iron dual Group 3 fluid power solution designed to international SAE mounting standards. It couples a dedicated heavy-duty spheroidal graphite ductile cast-iron Group 3 front through-drive pump stage (3PT3F) with a matching Group 3 cast-iron rear pump stage (3PTF). Driven synchronously through an oversized, induction-hardened internal splined through-drive coupling, this assembly eliminates bulky split-drive gearboxes or complex electronic flow divider networks, delivering two distinct high-flow hydraulic circuits with completely independent operating pressures and flows.
Featuring an industry-standard SAE B 2-bolt oval mounting flange (centring pilot Ø 101.6 mm / 4.00 inches h8, bolt hole center spacing 146.0 mm / 5.75 inches), the 3PT3F+3PTF series provides direct 1:1 drop-in interchangeability with OEM tandem gear pumps across 27 leading international hydraulic manufacturers, including CASAPPA (KP30 / KP35 / HDP30 / HDP35), Bosch Rexroth (AZPT / AZPG), PARKER (PGP620 / PGP640), MARZOCCHI, and DANFOSS. Both front and rear pump stages cover high displacements from 20.0 to 71.0 cm³/rev, allowing dual heavy work circuits—such as boom lift and swing drive, travel propel and implement circuits, or auxiliary high-flow hydrostatic motors—to operate simultaneously at continuous working pressures up to 280 bar (4,060 psi) and peak pressures up to 320 bar (4,640 psi).
Both gear housings, mounting flange, intermediate coupling adapter, and rear cover are cast from high-tensile spheroidal graphite ductile iron (QT500 / GGG50), delivering outstanding structural fatigue resistance, extreme pressure containment, and superior acoustic dampening under severe cyclic shock loads. Precision-ground, case-hardened alloy steel gears ride within heavy-duty composite DU/PTFE hydrodynamic sleeve bushings. Independently floating hydrostatic axial thrust balance plates on both pump sections continuously equalize running clearances across variable thermal and viscosity gradients, maintaining volumetric efficiencies exceeding 94% while suppressing pressure ripple and acoustic emissions throughout rigorous operational lifespans.
| Dimension of HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 3PT3F+3PTF SAE B 2-Bolt Series
Interface data needed with the drawing:
| Item | Value |
|---|---|
| Front mounting flange | SAE B 2-bolt oval mounting flange (centring pilot Ø 101.6 mm / 4.00" h8, bolt hole center spacing 146.0 mm / 5.75", clearance holes Ø 14.3 mm / 9/16" for 1/2" bolts) |
| Primary drive shaft | SAE B 13-tooth involute splined shaft (7/8" 16/32 DP, flat root side fit) / Optional SAE B 15-tooth spline (1" 16/32 DP) / SAE B cylindrical keyed shaft Ø 22.22 mm (7/8") with 1/4" square key / European 1:8 taper shaft |
| Intermediate drive coupling | Heavy-duty induction-hardened internal involute splined through-drive coupling rated for full cumulative drive torque (Tmax ≥ 280 Nm) connecting the front 3PT3F through-shaft to the rear 3PTF gear journal |
| Rotation direction | Clockwise (D) or Counter-clockwise (S), viewed from drive shaft end (Bi-directional reversible rotation available upon special engineering order) |
| Inlet port routing | Independent separate suction ports (standard: individual 3PT3F and 3PTF high-flow suction ports) / Common merged suction port located on intermediate cast-iron body (optional for consolidated tank line piping) |
| Front stage ports (3PT3F Cast Iron) | SAE 4-bolt split flange (Code 61, standard) / SAE straight thread O-ring boss (UN/UNF) / BSPP cylindrical thread / European 4-bolt diamond flange |
| Rear stage ports (3PTF Cast Iron) | SAE 4-bolt split flange (Code 61, standard) / SAE straight thread O-ring boss (UN/UNF) / BSPP cylindrical thread / European 4-bolt diamond flange |
| Seal materials | Standard NBR Buna-N elastomeric seals (-20 °C to +85 °C / -4 °F to +185 °F); Optional Viton (FKM) fluorocarbon seals for high-temperature synthetic fluid applications (-15 °C to +110 °C / +5 °F to +230 °F) |
| Body construction | Full spheroidal graphite ductile cast iron (QT500 / GGG50) construction for front body, SAE B 2-bolt flange, intermediate bracket, rear body, and rear cover |
| Flange mounting bolt torque | 100 ± 10 Nm (74 ÷ 81 lbf ft) for 1/2-13 UNC Grade 8 / M12 Grade 8.8 mounting bolts |
| Tie-rod clamp bolt torque | Front 3PT3F section: 110 ± 10 Nm; Rear 3PTF section: 110 ± 10 Nm |
| Pump Installation Specifications HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 3PT3F+3PTF SAE B 2-Bolt Series
The HENGYUHANG 3PT3F+3PTF SAE B 2-bolt flange tandem cast iron series utilizes an unambiguous modular model numbering system:
Code structure — reference: 3PT3F+3PTF-SAEB2 — Dual Group 3 Cast Iron SAE B 2-Bolt Tandem Gear Pump Series
| Segment | Meaning | Standard Options & Features |
|---|---|---|
| Series Code | 3PT3F+3PTF | Dedicated dual Group 3 cast iron tandem gear pump: Group 3PT3F front stage + Group 3PTF rear stage |
| Front Displacement | 20 to 71 | Group 3PT3F cast iron displacement in cm³/rev (20.0, 22.5, 26.0, 33.0, 38.0, 44.0, 52.0, 60.0, 71.0) |
| Rear Displacement | 20 to 71 | Group 3PTF cast iron displacement in cm³/rev (20.0, 22.5, 26.0, 33.0, 38.0, 44.0, 52.0, 60.0, 71.0) |
| Rotation | D / S / R | D: Clockwise; S: Counter-clockwise; R: Reversible bi-directional |
| Drive Shaft | SB13 / SB15 / C22 | SB13: SAE B 13T spline (7/8" 16/32 DP); SB15: SAE B 15T spline (1" 16/32 DP); C22: Ø 22.22 mm keyed |
| Mounting Flange | SAEB2 | SAE B 2-bolt oval flange (pilot Ø 101.6 mm, 146.0 mm bolt spacing) |
| Inlet Routing | S / C | S: Separate dual suction ports (independent circuits); C: Common single merged suction inlet |
| Port Types | SF / UN / G / EF | SF: SAE split flange (Code 61); UN: SAE O-ring boss; G: BSPP thread; EF: European flange |
| Seals | N / V | N: Buna-N (NBR) standard; V: Viton (FKM) high-temperature / synthetic fluid seals |
| Auxiliary Options | RV / FD / ST | RV: Integrated pressure relief valve; FD: Priority flow divider valve; ST: Customized OEM specification |
| Reading your replacement code
| Your Target Brand & Model | HENGYUHANG 3PT3F+3PTF Equivalent | Interchange Verification Notes |
|---|---|---|
| CASAPPA KP30 / KP35 / HDP30 / HDP35 Tandem (SAE B) | HENGYUHANG 3PT3F+3PTF Series | 100% direct drop-in; identical pilot Ø 101.6 mm, 146 mm bolt pattern, 13T spline, full cast iron dual body |
| Bosch Rexroth AZPT + AZPT / AZPG Tandem (SAE B) | HENGYUHANG 3PT3F+3PTF Series | Seamless mechanical envelope, shaft spline fit, and heavy-duty cast iron dual-circuit pressure capability |
| PARKER PGP620 + PGP620 / PGP640 Tandem (SAE B) | HENGYUHANG 3PT3F+3PTF Series | Direct cast iron replacement for heavy mobile excavators, wheel loaders, and forestry equipment |
| MARZOCCHI GHP3 + GHP3 / ALP3 Tandem (SAE B) | HENGYUHANG 3PT3F+3PTF Series | Exact match on SAE B flange spigot, port drilling centers, and through-drive torque ratings |
| DANFOSS SNP3NN + SNP3NN Tandem (SAE B) | HENGYUHANG 3PT3F+3PTF Series | Direct drop-in fit for heavy agricultural tractors, combine harvesters, and construction machinery |
| JIHOSTROJ QHD1 + QHD1 / QHD2 Tandem (SAE B) | HENGYUHANG 3PT3F+3PTF Series | Complete heavy cast iron drop-in replacement with identical mounting spigot and spline specifications |
| BUCHER Hydraulics AP300 + AP300 Tandem (SAE B) | HENGYUHANG 3PT3F+3PTF Series | Direct drop-in fit for high-power industrial power packs, drilling rigs, and heavy material handling units |
| Galtech 3SPA + 3SPA Tandem (SAE Mount) | HENGYUHANG 3PT3F+3PTF Series | Identical mounting pilot, through-shaft torque distribution, and port centerline dimensions |
| Techspecs of HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 3PT3F+3PTF SAE B 2-Bolt Series
| Performance Data Across Displacements
Front Stage — Group 3PT3F (Cast Iron Heavy-Duty Through-Drive)
| Model Code | Displacement (cm³/rev) | Displacement (in³/rev) | Continuous Pressure p1 (bar / psi) | Intermittent Pressure p2 (bar / psi) | Peak Pressure p3 (bar / psi) | Min. Speed (r/min) | Max. Speed (r/min) | Flow at 1500 r/min (l/min) |
|---|---|---|---|---|---|---|---|---|
| 3PT3F-20 | 20.0 | 1.220 | 280 / 4,060 | 300 / 4,350 | 320 / 4,640 | 600 | 3,500 | 30.00 |
| 3PT3F-22 | 22.5 | 1.372 | 280 / 4,060 | 300 / 4,350 | 320 / 4,640 | 600 | 3,500 | 33.75 |
| 3PT3F-26 | 26.0 | 1.586 | 280 / 4,060 | 300 / 4,350 | 320 / 4,640 | 600 | 3,500 | 39.00 |
| 3PT3F-33 | 33.0 | 2.013 | 280 / 4,060 | 300 / 4,350 | 320 / 4,640 | 600 | 3,200 | 49.50 |
| 3PT3F-38 | 38.0 | 2.318 | 270 / 3,915 | 290 / 4,205 | 310 / 4,495 | 500 | 3,000 | 57.00 |
| 3PT3F-44 | 44.0 | 2.684 | 260 / 3,770 | 280 / 4,060 | 300 / 4,350 | 500 | 3,000 | 66.00 |
| 3PT3F-52 | 52.0 | 3.172 | 240 / 3,480 | 260 / 3,770 | 280 / 4,060 | 500 | 2,800 | 78.00 |
| 3PT3F-60 | 60.0 | 3.660 | 220 / 3,190 | 240 / 3,480 | 260 / 3,770 | 500 | 2,800 | 90.00 |
| 3PT3F-71 | 71.0 | 4.331 | 200 / 2,900 | 220 / 3,190 | 240 / 3,480 | 500 | 2,500 | 106.50 |
Rear Stage — Group 3PTF (Cast Iron Heavy-Duty)
| Model Code | Displacement (cm³/rev) | Displacement (in³/rev) | Continuous Pressure p1 (bar / psi) | Intermittent Pressure p2 (bar / psi) | Peak Pressure p3 (bar / psi) | Min. Speed (r/min) | Max. Speed (r/min) | Flow at 1500 r/min (l/min) |
|---|---|---|---|---|---|---|---|---|
| 3PTF-20 | 20.0 | 1.220 | 280 / 4,060 | 300 / 4,350 | 320 / 4,640 | 600 | 3,500 | 30.00 |
| 3PTF-22 | 22.5 | 1.372 | 280 / 4,060 | 300 / 4,350 | 320 / 4,640 | 600 | 3,500 | 33.75 |
| 3PTF-26 | 26.0 | 1.586 | 280 / 4,060 | 300 / 4,350 | 320 / 4,640 | 600 | 3,500 | 39.00 |
| 3PTF-33 | 33.0 | 2.013 | 280 / 4,060 | 300 / 4,350 | 320 / 4,640 | 600 | 3,200 | 49.50 |
| 3PTF-38 | 38.0 | 2.318 | 270 / 3,915 | 290 / 4,205 | 310 / 4,495 | 500 | 3,000 | 57.00 |
| 3PTF-44 | 44.0 | 2.684 | 260 / 3,770 | 280 / 4,060 | 300 / 4,350 | 500 | 3,000 | 66.00 |
| 3PTF-52 | 52.0 | 3.172 | 240 / 3,480 | 260 / 3,770 | 280 / 4,060 | 500 | 2,800 | 78.00 |
| 3PTF-60 | 60.0 | 3.660 | 220 / 3,190 | 240 / 3,480 | 260 / 3,770 | 500 | 2,800 | 90.00 |
| 3PTF-71 | 71.0 | 4.331 | 200 / 2,900 | 220 / 3,190 | 240 / 3,480 | 500 | 2,500 | 106.50 |
Note: Operating speed of the complete tandem assembly is governed by the lower maximum speed limit of the two selected pump displacements.
| Operating Conditions & Fluid Compatibility
| Operating Parameter | Specification | Recommendation & Limits |
|---|---|---|
| Hydraulic fluid type | Mineral oil-based hydraulic fluids | HL or HLP hydraulic oils to ISO 6743/4; DIN 51524 Part 1 and 2 |
| Operating viscosity range | 12 to 100 mm²/s (cSt) | Optimum performance viscosity range: 20 to 80 mm²/s (cSt) |
| Cold start viscosity limit | Up to 1,000 mm²/s (cSt) | Permissible during low-speed, low-pressure machine warm-up cycles |
| Fluid operating temperature | -20 °C to +85 °C (-4 °F to +185 °F) | Standard NBR Buna-N seals; Viton (FKM) required for +85 °C to +110 °C |
| Inlet suction line pressure | 0.7 to 3.0 bar absolute (10 to 44 psia) | Minimum 0.7 bar abs. at full working speed to prevent inlet cavitation |
| Fluid cleanliness rating | ISO 4406 Class 20/18/15 | Recommended circuit filtration: β25 ≥ 75 on return or suction filtration loop |
| Drive torque transmission | Heavy-duty through-drive intermediate shaft | Input shaft maximum torque must satisfy: Ttotal = Tfront + Trear ≤ Tshaft_limit |
Advantages — HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 3PT3F+3PTF SAE B 2-Bolt Series
Full Dual Cast Iron Structural Durability
Both front and rear pump bodies, intermediate adapter, and mounting flange are precision-cast from high-grade spheroidal graphite ductile cast iron (QT500), delivering superior fatigue endurance, extreme rigidity against barrel dilation, and peak operating pressures up to 320 bar (4,640 psi).
SAE B 2-Bolt Flange Drop-In Interchangeability
Machined to exact SAE B 2-bolt oval mounting dimensions (pilot Ø 101.6 mm, bolt hole spacing 146.0 mm) with standard 13-tooth or 15-tooth involute splined or keyed drive shafts, providing zero-modification drop-in substitution across 27 global pump brands including CASAPPA KP30/KP35/HDP and Parker PGP620/PGP640.
Dual Group 3 High-Flow Multi-Circuit Delivery
Combines two high-displacement Group 3 stages (each up to 71 cm³/rev) to power dual heavy-duty primary circuits—such as boom lift and travel drive—from a single prime mover power take-off, delivering combined flow exceeding 210 l/min.
Heavy-Duty Through-Drive Torque Transmission
Features an oversized, induction-hardened internal involute splined through-drive coupling rated to transmit full combined continuous drive torque without driveline backlash or premature spline fretting.
Sustained High Volumetric Efficiency (>94%)
Individual hydrostatic floating thrust balance plates on both pump sections continuously balance axial clearances across temperature and pressure fluctuations, minimizing internal slip and ensuring consistent output flow.
Superior Acoustic Damping & Low Pressure Ripple
High-precision hobbed and shaved gear profiles combined with the dense acoustic dampening characteristics of dual cast iron bodies dramatically reduce operational noise across operator cabs and industrial workstations.
Reference — HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 3PT3F+3PTF SAE B 2-Bolt Series
Series Architecture Across Dual Group 3 Cast Iron Tandem Combinations
The modular 3PT3F+3PTF tandem architecture pairs 9 front cast iron displacements with 9 rear cast iron displacements, generating over 81 standardized displacement combinations:
Heavy Cast Iron Primary Stage (Group 3PT3F): Displacements 20.0, 22.5, 26.0, 33.0, 38.0, 44.0, 52.0, 60.0, and 71.0 cm³/rev for high-pressure primary work circuits operating up to 320 bar peak pressure.
Heavy Cast Iron Secondary Stage (Group 3PTF): Displacements 20.0, 22.5, 26.0, 33.0, 38.0, 44.0, 52.0, 60.0, and 71.0 cm³/rev for high-flow secondary work circuits, track propel drives, auxiliary boom functions, or heavy hydraulic motors.
Comprehensive Interchangeability Matrix Across 27 Brands
The HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 3PT3F+3PTF SAE B 2-Bolt Series provides full mechanical, mounting, and hydraulic drop-in substitution for the following 27 international hydraulic manufacturers and their designated pump families:
MARZOCCHI: GHP2A, ALP2A, GHP2, ALP2, 1PD, GHP3, ALP3, GHP3A, ALP3A series tandem and modular gear pumps.
DANFOSS Power Solutions: SNP1NN, SNP3NN, SNW3NN series, SNP2, SNW2 series multi-section hydraulic pumps.
HYDAC: PGE102, PGE103 series, PGE104 series multi-circuit external gear pumps.
ARGO-HYTOS: GP2, GP3, GP1 series tandem external gear pump assemblies.
ATOS: PFG series modular tandem external gear pumps.
Brevini Fluid Power (Dana Brevini): OT100, OT200, OT300 series tandem gear pumps.
BUCHER Hydraulics: AP100, AP200, AP212, AP300 series multi-section gear pumps.
BONDIOLI & PAVESI: HPLPA1, HPLPA2, HPLPA3 series modular tandem gear pump units.
Boden: BAP1 series, BHP1, BAP2, BHP2, BHP3, BAP3 series multi-circuit hydraulic gear pumps.
Caproni: 10A, 20A, 30A, 10C, 20C, 30C series multi-section hydraulic pumps.
CASAPPA: KP20, PHP20, Polaris 20, PLP30, KP30, KP35, HDP30, HDP35 series cast iron and aluminum tandem gear pumps.
CONCENTRIC (Haldex): WP300, WP900, WP1500 series multi-stage external gear pumps.
DUPLOMATIC: 1P, GP2, GP3, GP1 series tandem external gear pumps.
Galtech: 1SPA, 2SPA, 3GPG, 3SPA series multi-circuit tandem hydraulic pumps.
GRH Hydraulics: 1PF, 2PF, 3PF series modular tandem external gear pumps.
HANSA-TMP: 1SP, 2SP, 3GPG, 3SPA series tandem gear pump systems.
HESPER: HA11, HA2, HA3 series, CHP1 series multi-stage hydraulic gear pumps.
HONOR Gear Pumps: 1KH series and Group 2/Group 3 tandem gear pump configurations.
HPI (Hydraulique Professionnelle Industrielle): P1BAN1, P1BAN2, P1AAN2, P1BAN3, P1AAN3 series tandem pumps.
HYDRONIT: E series multi-circuit modular gear pumps.
JIHOSTROJ: P23 series, J series, T3 series, Q2 series, UD series, QHD1, QHD2 heavy-duty cast iron multi-section gear pumps.
PARKER Hannifin: PGP511, PGP517 series, PGP620, PGP640 heavy-duty cast iron tandem external gear pumps.
Bosch Rexroth: AZPF, AZPG, AZPN, AZPT heavy-duty cast iron multi-circuit external gear pumps.
RONZIO: 02ZAG, 02ZCG, 02ZLG series, 03ZBG, 03ZAG series tandem gear pumps.
ROQUET: 1L0 series, PLA series, GZ series, G series, GLA series, PLC series, PNA series, PLJ series, PLK series, PLH series, PLZ series multi-stage gear pumps.
SDH (Shengda Hydraulics): CBN, CBT, CBF series multi-section external gear pumps.
VIVOLO (Vivoil): X1P series, XV-1P series, X2P, X3P series, XV-2P, XV-3P series tandem external gear pumps.
Brand Replacement
Quanzhou Hengyuhang Power Technology Co., Ltd. manufactures the 3PT3F+3PTF SAE B 2-Bolt Tandem Cast Iron Gear Pump Series in strict alignment with SAE standardized mounting dimensions and high-pressure fluid power specifications. Every tandem unit undergoes 100% computerized end-of-line verification, including simultaneous dual-circuit continuous pressure hold, multi-speed volumetric efficiency mapping (>94%), high-torque through-drive spline integrity testing, and port thread gauge verification. Machinery builders, equipment rebuilders, and hydraulic distributors can replace worn, failed, or long-lead OEM tandem pumps from CASAPPA (KP30 / KP35 / HDP30 / HDP35), Rexroth (AZPT), PARKER (PGP620 / PGP640), MARZOCCHI, and DANFOSS with zero machine modifications, zero bracket reworking, and zero driveline realignment. Custom displacement combinations, specialized shaft profiles, common inlet manifolds, and integrated pressure relief or priority valves are fully supported with agile production schedules.
Applications — HENGYUHANG Tandem Cast Iron Hydraulic Gear Pump 3PT3F+3PTF SAE B 2-Bolt Series
Mobile Construction Machinery: Mid-to-large crawler excavators, heavy wheel loaders, backhoe loaders, trenchers, and crawler cranes requiring high-pressure, high-flow dual-circuit implement hydraulics.
Agricultural & Harvesting Equipment: High-horsepower farm tractors, combine harvesters, forage harvesters, large round balers, and heavy sprayers requiring independent high-flow implement and steering/auxiliary drive loops.
Material Handling & Aerial Equipment: Heavy container handlers, reach stackers, rough-terrain forklifts, and high-reach telescopic work platforms.
Forestry & Timber Machinery: Forwarders, log skidders, feller bunchers, wood chippers, and heavy-duty tub grinders.
Stationary Industrial Hydraulic Power Units (HPUs): High-tonnage hydraulic presses, metal scrap balers, shear balers, injection molding clamping units, and high-flow central industrial lubrication systems.
Mining & Drilling Support Equipment: Underground mining utility loaders, surface drill rigs, rock splitters, and tunnel muckers operating in hostile, abrasive environments.
Package & Shipping
| Packaging | Neutral heavy-duty export carton with form-fitting high-density molded foam cushioning; individual sealed anti-corrosion VCI barrier bags; export standard fumigation-free wooden pallet consolidation for batch orders. |
|---|---|
| Selling Unit | Single item (MOQ: 1 piece for standard displacement configurations; low MOQ for customized OEM combinations). |
| Single Package Size | 46.0 × 28.0 × 26.0 cm (18.11 × 11.02 × 10.24 in) per tandem pump assembly. |
| Single Gross Weight | 22.50 to 34.80 kg (49.60 to 76.72 lbs) depending on displacement pairing and port options. |
| Standard Lead Time | 3–7 business days for stock displacement pairings; 15–20 business days for tailored OEM batch production. |
| Logistics & Express | Air express (DHL, FedEx, UPS, TNT), air freight, ocean freight (FCL / LCL), and multimodal door-to-door DDP logistics with full tracking. |
| Customization Services | Custom nameplate laser engraving, private brand labeling, specialized shaft spline profiles, custom port threads, and factory CAD verification. |
Why Choose Hengyuhang?
Direct Factory Precision Manufacturing & CNC Excellence: Hengyuhang operates an advanced precision manufacturing facility equipped with multi-axis CNC machining centers, high-speed gear hobbing equipment, and CNC gear profile grinding machines. Operating clearances and gear tooth profiles are held to sub-micron tolerances (Ra < 0.2 μm), ensuring flawless gear meshing, structural rigidity, and long service life.
100% Full-Cycle Multi-Parameter Factory Inspection: Every tandem pump unit undergoes rigorous computerized testing prior to packaging. Testing protocols encompass multi-speed volumetric efficiency benchmarking (>94%), continuous rated and peak pressure endurance, internal casing leakage measurement, through-drive intermediate coupling load verification, and digital acoustic spectrum analysis to guarantee zero-defect delivery.
Seamless 1:1 OEM Drop-In Interchangeability: Engineered to precise SAE B 2-bolt flange, standard 13-tooth or 15-tooth involute splined shaft, and port centerline dimensions, Hengyuhang pumps provide 100% form, fit, and functional drop-in replacement for over 27 global hydraulic manufacturers without mounting bracket or plumbing alterations.
Flexible Engineering Customization & Rapid Prototyping: Supported by an experienced hydraulic engineering team, Hengyuhang provides tailored solutions including non-standard displacement combinations, common or separate suction port routing, integrated pressure relief or priority flow control valves, and low-MOQ rapid sampling for new machinery development.
Robust Supply Chain, Extensive Inventory & Fast Global Dispatch: With large strategic raw material reserves of ductile cast-iron, standard displacement assemblies ship within 48 to 72 hours. Comprehensive international logistics channels ensure dependable door-to-door DDP delivery worldwide.
12-Month Comprehensive Warranty & Lifetime Technical Support: All products are backed by an unconditional 12-month factory warranty. Hengyuhang's dedicated fluid power engineers provide rapid 24-hour CAD mounting verification, cross-reference model decoding, and lifetime technical support for distributors and OEMs worldwide.
Tandem Cast Iron Hydraulic Gear Pump Group 3PT3F+3PTF SAE B 2-Bolt Series (21.99~73.82 + 21.99~73.82 cm³/rev) is a severe-duty, all-cast-iron dual-stage external gear pump engineered to deliver maximum mechanical rigidity, high continuous operating pressures, and dual high-flow fluid power from a single prime mover. Equipped with an industry-standard SAE J744 SAE "B" 2-bolt oval mounting flange (pilot Ø101.6 mm / 4.000 in with 146.0 mm / 5.748 in bolt hole centers), this multi-section assembly integrates two Group 3 heavy-duty ductile cast-iron pumps—a front primary pump (3PT3F) and a rear secondary pump (3PTF)—coupled via a heavy-duty internal spline through-drive intermediate shaft. Both stages are constructed entirely from high-density spheroidal graphite ductile cast iron (front SAE B mounting flange, front gear casing, intermediate tandem adapter plate, rear gear casing, and rear end-cover), completely eliminating housing barrel dilation, bolt elongation, and fatigue under cyclic pressure spikes. Offering 12 standardized displacements for each section (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), the tandem pump provides modular combined displacement capacities from 43.98 up to 147.64 cm³/rev (delivering up to 221.46 L/min @ 1500 rpm). Both stages sustain continuous working pressures (p1) up to 280 bar (4,060 psi), intermittent pressures (p2) up to 300 bar (4,350 psi), and transient peak shock pressures (p3) up to 320 bar (4,640 psi). Featuring case-hardened alloy steel precision gears and hydrostatic axial pressure-balanced DU composite sleeve bushings, this series maintains over 94% volumetric efficiency and serves as a direct 1:1 drop-in replacement for CASAPPA KAPPA (KP30+KP30), Bosch Rexroth (AZPN/AZPG+AZPN/AZPG), Marzocchi (GHP3+GHP3), and Parker Commercial PGP517+PGP517 SAE B dual cast-iron gear pumps.
| Applications
The 3PT3F+3PTF all-cast-iron SAE B 2-bolt tandem hydraulic gear pump series is specifically developed for severe continuous duty, extreme ambient temperatures, and harsh mobile or industrial environments where both hydraulic circuits demand high delivery flow and extreme cyclic pressure endurance from a single transmission PTO or engine drive:
Heavy Commercial Utility Trucks & Refuse Vehicles: Directly PTO-driven, the front severe-duty cast-iron stage powers high-pressure refuse packing blades and roll-off container hoists, while the rear cast-iron stage simultaneously powers heavy crane boom winches or auxiliary compactor ejector plates under heavy cyclic resistance.
Heavy Wheel Loaders & Articulated Dump Trucks: Both high-pressure cast-iron stages withstand severe cyclic breakout digging shocks, powering boom lift and bucket tilt main cylinders on the primary stage, while the secondary stage supplies high-volume fluid to hydraulic steering cylinders and fan drive cooling loops.
Heavy Agricultural Tractors & Harvesters: The primary cast-iron pump handles heavy front-end loader arms and high-tonnage implement hydraulics, while the secondary cast-iron pump independently powers high-pressure hydraulic motors for grain unloader augers, threshing drives, or rear hitch cylinders without inter-circuit pressure drops.
Rough-Terrain Reach Stackers & Heavy Telehandlers: Supplies dual high-flow hydraulic power where the primary stage operates main mast hoisting cylinders and the secondary stage operates heavy boom telescoping and container spreader twist-lock circuits under continuous load holding.
Heavy Industrial Hydraulic Presses & Scrap Shears: Serves as an all-cast-iron high-low or dual-circuit pump combination where both stages combine during rapid cylinder approach, after which one stage sustains extreme holding pressures up to 280 bar without risk of housing deflection or fatigue failure.
Forestry Skidders, Feller Bunchers & Mobile Cranes: Operates under abrasive continuous conditions, powering heavy felling head saws and grapple arms on the primary stage, while the secondary stage powers independent track drive assist and crane boom slew gearboxes.
| Key Specifications Overview
| Parameter | Specification |
|---|---|
| Series Architecture | All-Cast-Iron Heavy-Duty Dual-Stage External Gear Pump (Group 3 Front 3PT3F + Group 3 Rear 3PTF) |
| Front Stage Displacement (3PT3F) | 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 (3PTF) | 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) |
| Total Combined Displacement Range | 43.98 ~ 147.64 cm³/rev (modular dual-stage independent pairing: V1 + V2) |
| Continuous Operating Pressure (p1) | 170 ~ 280 bar (2,465 ~ 4,060 psi) — 280 bar for 21.99~43.98 cc; 270 bar for 46.34 cc; 210 bar for 51.83 cc; 190 bar for 56.54 cc; 180 bar for 61.26 cc; 170 bar for 73.82 cc |
| Intermittent Operating Pressure (p2) | 190 ~ 300 bar (2,755 ~ 4,350 psi) — 300 bar for 21.99~43.98 cc; 290 bar for 46.34 cc; 230 bar for 51.83 cc; 210 bar for 56.54 cc; 200 bar for 61.26 cc; 190 bar for 73.82 cc |
| Max. Peak Pressure (p3) | 210 ~ 320 bar (3,045 ~ 4,640 psi) — 320 bar for 21.99~43.98 cc; 310 bar for 46.34 cc; 250 bar for 51.83 cc; 230 bar for 56.54 cc; 220 bar for 61.26 cc; 210 bar for 73.82 cc |
| Rotational Speed Range | Min. speed: 350 min⁻¹; Max. speed: 2500 ~ 3000 min⁻¹ (displacement dependent; up to 3000 min⁻¹ for 21.99~46.34 cc) |
| Volumetric Efficiency | ≥ 94% across rated operating pressure and thermal range |
| Hydro-Mechanical Efficiency | ≥ 89% ~ 92% |
| Body & Housing Construction | 100% all-cast-iron construction: spheroidal graphite ductile cast-iron front SAE B flange, gear casings, intermediate adapter plate, and rear cover |
| Mounting Flange Standard | SAE J744 SAE "B" 2-bolt oval mounting flange (pilot Ø101.6 mm / 4.000 in with 146.0 mm / 5.748 in bolt centers, 2 × Ø14.3 mm / 0.563 in holes, 9.5 mm / 0.374 in pilot depth) |
| Primary Drive Shaft Specification | SAE "B" 13-tooth involute splined shaft (16/32 DP, 30° pressure angle, max torque 280 Nm) or SAE "B" cylindrical keyed shaft (Ø22.22 mm / 7/8 in with 6.35 mm key, max torque 220 Nm) |
| Intermediate Coupling Mechanism | High-tensile alloy steel internal spline through-drive coupling connecting Group 3 cast-iron stages (allowable intermediate torque: up to 220 Nm) |
| Hydraulic Port Connections | SAE Code 61 4-bolt split flange (3/8-16 UNC or 7/16-14 UNC) or SAE straight-thread O-ring boss (ORB 1-5/8-12 inlet, 1-1/16-12 outlet); optional 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 (752 ÷ 796 lbf in); Body tie-rod screw bolts: 90 ± 5 Nm (796 ÷ 841 lbf in) |
| Technical Performance Matrix Across Available Group 3 Cast Iron Stages
| Stage Model Code | 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 | |||
| 3PT3F22 / 3PTF22 | 21.99 (1.34) | 280 / 4,060 | 300 / 4,350 | 320 / 4,640 | 350 | 3000 | 32.99 |
| 3PT3F27 / 3PTF27 | 26.70 (1.63) | 280 / 4,060 | 300 / 4,350 | 320 / 4,640 | 350 | 3000 | 40.05 |
| 3PT3F31 / 3PTF31 | 30.63 (1.87) | 280 / 4,060 | 300 / 4,350 | 320 / 4,640 | 350 | 3000 | 45.95 |
| 3PT3F34 / 3PTF34 | 34.56 (2.11) | 280 / 4,060 | 300 / 4,350 | 320 / 4,640 | 350 | 3000 | 51.84 |
| 3PT3F38 / 3PTF38 | 39.27 (2.40) | 280 / 4,060 | 300 / 4,350 | 320 / 4,640 | 350 | 3000 | 58.91 |
| 3PT3F41 / 3PTF41 | 41.62 (2.54) | 280 / 4,060 | 300 / 4,350 | 320 / 4,640 | 350 | 3000 | 62.43 |
| 3PT3F43 / 3PTF43 | 43.98 (2.68) | 280 / 4,060 | 300 / 4,350 | 320 / 4,640 | 350 | 3000 | 65.97 |
| 3PT3F46 / 3PTF46 | 46.34 (2.83) | 270 / 3,915 | 290 / 4,205 | 310 / 4,495 | 350 | 3000 | 69.51 |
| 3PT3F51 / 3PTF51 | 51.83 (3.16) | 210 / 3,045 | 230 / 3,335 | 250 / 3,625 | 350 | 2500 | 77.75 |
| 3PT3F56 / 3PTF56 | 56.54 (3.45) | 190 / 2,755 | 210 / 3,045 | 230 / 3,335 | 350 | 2500 | 84.81 |
| 3PT3F61 / 3PTF61 | 61.26 (3.74) | 180 / 2,610 | 200 / 2,900 | 220 / 3,190 | 350 | 2500 | 91.89 |
| 3PT3F73 / 3PTF73 | 73.82 (4.50) | 170 / 2,465 | 190 / 2,755 | 210 / 3,045 | 350 | 2500 | 110.73 |
| Mechanical Drive Guidelines & Torque Limitations
| Mechanical Parameter | Engineering Specification & Limit |
|---|---|
| Primary Shaft Max. Drive Torque (T1_max) | 280 Nm (2,478 lbf in) for SAE "B" 13-tooth involute spline shaft; 220 Nm (1,947 lbf in) for SAE "B" Ø22.22 mm (7/8 in) keyed shaft |
| 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 3 cast-iron 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 (protects through-drive intermediate spline coupling) |
| Recommended Stage Sequencing Rule | Mount the higher-displacement or higher-pressure stage at the front (3PT3F) and the lower-torque stage at the rear (3PTF) to maximize driveline longevity |
| SAE B 2-Bolt Mounting Flange, Shaft & Port Details
| Interface Feature | Technical Standard & Dimension |
|---|---|
| Mounting Flange | SAE J744 SAE "B" 2-bolt oval mounting flange (pilot Ø101.6 mm / 4.000 in, pilot depth 9.5 mm / 0.374 in) |
| Bolt Hole Center Distance | 146.0 mm (5.748 in) center-to-center distance with 2 × Ø14.3 mm (0.563 in) through mounting holes |
| Primary Drive Shaft (Standard) | SAE "B" 13-tooth involute splined shaft (16/32 DP, 30° pressure angle, flat root, shaft extension 33.3 mm from mounting face) |
| Primary Drive Shaft (Optional) | SAE "B" cylindrical keyed shaft (Ø22.22 mm / 7/8 in with 6.35 mm / 1/4 in square key, shaft extension 41.0 mm) |
| Intermediate Coupling Shaft | Heavy-duty alloy steel internal spline through-drive coupling connecting Group 3 cast-iron stages (allowable torque: up to 220 Nm) |
| Port Connections (Both Stages) | SAE 4-bolt split flange Code 61 (3/8-16 UNC or 7/16-14 UNC threads) or SAE straight-thread O-ring boss (ORB 1-5/8-12 inlet, 1-1/16-12 outlet); optional BSPP |
| 1:1 Direct-Fit OEM Brand Replacement Coverage
| Manufacturer Brand | Direct-Fit Drop-In Tandem Equivalent Series |
|---|---|
| CASAPPA | KAPPA Dual Cast Iron Series (KP30 + KP30 with SAE B 2-bolt flange; e.g. KP30.34+30.34, KP30.38+30.34) |
| Bosch Rexroth | AZPN / AZPG Group 3 All-Cast-Iron dual multiple gear pumps with SAE B oval mounting |
| MARZOCCHI | GHP3 + GHP3 Heavy-Duty Cast Iron modular tandem gear pumps with SAE B 2-bolt flange |
| PARKER Commercial | PGP517 + PGP517 / PGP620 + PGP620 Cast Iron dual external gear pumps (SAE B 2-bolt) |
| DANFOSS / Turolla | SNP3 Heavy Cast Iron + SNP3 Heavy Cast Iron multiple gear pumps with SAE B mounting |
| SALAMI | 3PB + 3PB All-Cast-Iron dual gear pumps with SAE B 2-bolt flange spigot |
| BUCHER Hydraulics | AP300 + AP300 / QX3 + QX3 Heavy Cast Iron SAE B double gear pump assemblies |
| Technical Performance Matrix Across Available Group 3 Cast Iron Stages
| Stage Model Code | 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 | |||
| 3PT3F22 / 3PTF22 | 21.99 (1.34) | 280 / 4,060 | 300 / 4,350 | 320 / 4,640 | 350 | 3000 | 32.99 |
| 3PT3F27 / 3PTF27 | 26.70 (1.63) | 280 / 4,060 | 300 / 4,350 | 320 / 4,640 | 350 | 3000 | 40.05 |
| 3PT3F31 / 3PTF31 | 30.63 (1.87) | 280 / 4,060 | 300 / 4,350 | 320 / 4,640 | 350 | 3000 | 45.95 |
| 3PT3F34 / 3PTF34 | 34.56 (2.11) | 280 / 4,060 | 300 / 4,350 | 320 / 4,640 | 350 | 3000 | 51.84 |
| 3PT3F38 / 3PTF38 | 39.27 (2.40) | 280 / 4,060 | 300 / 4,350 | 320 / 4,640 | 350 | 3000 | 58.91 |
| 3PT3F41 / 3PTF41 | 41.62 (2.54) | 280 / 4,060 | 300 / 4,350 | 320 / 4,640 | 350 | 3000 | 62.43 |
| 3PT3F43 / 3PTF43 | 43.98 (2.68) | 280 / 4,060 | 300 / 4,350 | 320 / 4,640 | 350 | 3000 | 65.97 |
| 3PT3F46 / 3PTF46 | 46.34 (2.83) | 270 / 3,915 | 290 / 4,205 | 310 / 4,495 | 350 | 3000 | 69.51 |
| 3PT3F51 / 3PTF51 | 51.83 (3.16) | 210 / 3,045 | 230 / 3,335 | 250 / 3,625 | 350 | 2500 | 77.75 |
| 3PT3F56 / 3PTF56 | 56.54 (3.45) | 190 / 2,755 | 210 / 3,045 | 230 / 3,335 | 350 | 2500 | 84.81 |
| 3PT3F61 / 3PTF61 | 61.26 (3.74) | 180 / 2,610 | 200 / 2,900 | 220 / 3,190 | 350 | 2500 | 91.89 |
| 3PT3F73 / 3PTF73 | 73.82 (4.50) | 170 / 2,465 | 190 / 2,755 | 210 / 3,045 | 350 | 2500 | 110.73 |
| Manufacturer Brand | Direct-Fit Drop-In Tandem Equivalent Series |
|---|---|
| CASAPPA | KAPPA Dual Cast Iron Series (KP30 + KP30 with SAE B 2-bolt flange; e.g. KP30.34+30.34, KP30.38+30.34) |
| Bosch Rexroth | AZPN / AZPG Group 3 All-Cast-Iron dual multiple gear pumps with SAE B oval mounting |
| MARZOCCHI | GHP3 + GHP3 Heavy-Duty Cast Iron modular tandem gear pumps with SAE B 2-bolt flange |
| PARKER Commercial | PGP517 + PGP517 / PGP620 + PGP620 Cast Iron dual external gear pumps (SAE B 2-bolt) |
| DANFOSS / Turolla | SNP3 Heavy Cast Iron + SNP3 Heavy Cast Iron multiple gear pumps with SAE B mounting |
| SALAMI | 3PB + 3PB All-Cast-Iron dual gear pumps with SAE B 2-bolt flange spigot |
| BUCHER Hydraulics | AP300 + AP300 / QX3 + QX3 Heavy Cast Iron SAE B double gear pump assemblies |
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