Piston pump
HENGYUHANG Axial Piston Variable Double Pump HYH20VLO Series 10
HENGYUHANG HYH20VLO Series 10 is a heavy-duty back-to-back swashplate axial piston variable double pump equipped with an integrated centrifugal charge pump (impeller), delivering 350 bar nominal continuous pressure (400 bar peak), elevated prime mover drive speeds up to 2,500 rpm without external inlet pressurization, and seamless 1:1 drop-in interchangeability with Bosch Rexroth A20VLO Series 10 pumps.
| Applications
Engineered specifically for dual-circuit open-loop hydraulic systems in high-power mobile machinery and heavy off-highway equipment driven directly by high-speed diesel engines, including 40-tonne to 120-tonne crawler mining excavators, heavy demolition machines, material handlers, harbor cranes, rotary drilling rigs, and heavy mobile crushing plants requiring synchronous or independent high-flow dual circuits up to 2×598 L/min.
| Key Technical Specifications
Product Model: HYH20VLO Series 10 (Sizes 2×190 and 2×260)
Brand Replacement: Bosch Rexroth A20VLO Series 10 (Sizes 190 and 260), OEM or as requested.
Displacement: 2×192.7 cm³/rev (Size 190, combined 385.4 cm³/rev) and 2×260.0 cm³/rev (Size 260, combined 520.0 cm³/rev)
Rotation Direction: Clockwise (R) or Counter-clockwise (L), viewed facing drive shaft
Speed Range: Rated speed with charge pump n nom = 2,500 rpm (Size 190) / 2,300 rpm (Size 260) at atmospheric inlet pressure (p abs = 0.8 bar at port S; n min = 500 rpm)
Peak Pressure: Nominal continuous pressure p nom = 350 bar (5,100 psi) / Maximum peak pressure p max = 400 bar (5,800 psi)
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| Overview of HENGYUHANG HYH20VLO Series 10 Hydraulic Pumps
The HENGYUHANG HYH20VLO Series 10 is an ultra-heavy-duty swashplate axial piston variable double pump specifically engineered for demanding open-circuit dual-stream hydrostatic drive systems. Integrating two independently variable rotary groups back-to-back within a single high-integrity monobloc cast housing, the HYH20VLO is distinguished by its built-in centrifugal charge pump (impeller) positioned coaxially on the main drive line. This internal charge pump pre-pressurizes hydraulic fluid entering both rotary groups from a shared central suction port S, allowing high-power diesel engines to run at elevated operational speeds (up to 2,500 rpm for size 190 and 2,300 rpm for size 260) without requiring an elevated or pressurized reservoir.
Serving as a direct 1:1 dimensional, physical, and functional drop-in replacement for Bosch Rexroth A20VLO Series 10 pumps, this series incorporates battle-proven rotary group components and heavy-duty hydrostatic cradle bearing kinematics from the flagship A11VLO Series 1x platform (Data Sheet 92500). Fluid delivery across each circuit is steplessly variable from full rated output down to zero stroke. Featuring symmetrical opposite high-pressure working ports (Ports A and B), dual case drain ports (T1, T2), external dynamic power setting capabilities while the machine is operating under full load, and standard full-torque through-drive rear mounting flanges for secondary auxiliary pumps (gear pumps or axial piston pumps), the HYH20VLO delivers unmatched power density, structural fatigue resistance, and system reliability across harsh mining, construction, and maritime duty cycles.
| Dimension of HENGYUHANG HYH20VLO Series 10 Hydraulic Pumps
| Mechanical Installation Interface Specifications
| Frame Size (HYH20VLO) | Mounting Flange Standard (ISO 3019-1) | Drive Shaft Options (DIN 5480 / ANSI B92.1a) |
|---|---|---|
| HYH20VLO190 | 4-Hole SAE 165-4 (E) Spigot Ø165.1 mm / Opt. SAE J617 No. 3 Flywheel Mount | Z: W50×2×24×9g (DIN 5480); T: 2 in 15T 8/16DP (ANSI B92.1a Reinforced) |
| HYH20VLO260 | 4-Hole SAE 165-4 (E) Spigot Ø165.1 mm | Z: W60×2×28×9g (DIN 5480); T: 2 1/4 in 17T 8/16DP (ANSI B92.1a Reinforced) |
| Frame Size (HYH20VLO) | Working Pressure Ports A and B (SAE J518 / ISO 6162-2) | Central Suction Port S (SAE J518 / ISO 6162-1) | Case Drain Ports T1 and T2 (DIN 3852-1) | Air Bleed Port R (DIN 3852-1) | Control Gauge Ports M1(A), M1(B), MA, MB | Control Pressure Ports GA, GB (DIN 3852-1) |
|---|---|---|---|---|---|---|
| HYH20VLO190 | Two Ports (A & B): 1 1/2 in (M16×2, 21 deep; 400 bar, Code 24) | 5 in (M16×2, 23 deep; max 30 bar absolute) | M33×2 (18 deep; max 10 bar) | M33×2 (16 deep; max 10 bar) | M12×1.5 (12 deep; max 400 bar) | M14×1.5 (12 deep; max 40 bar) |
| HYH20VLO260 | Two Ports (A & B): 1 1/2 in (M16×2, 21 deep; 400 bar, Code 24) | 5 in (M16×2, 23 deep; max 30 bar absolute) | M33×2 (18 deep; max 10 bar) | M33×2 (16 deep; max 10 bar) | M12×1.5 (12 deep; max 400 bar) | M14×1.5 (12 deep; max 40 bar) |
| Interface Engineering Notes
Common Suction Port S: A single 5-inch SAE flange port feeds the integral impeller charge pump, distributing pressurized fluid evenly to both rotary groups and eliminating complicated split suction manifolds.
Port Arrangement Code 24: Two lateral high-pressure ports (A and B) positioned symmetrically on opposite sides of the pump housing with metric DIN 13 fastening threads, perfectly clearing excavator frame rails.
Integral Centrifugal Charge Pump (Impeller): Permanently driven by the input shaft, maintaining a minimum internal inlet pressure ≥0.6 bar absolute across high-speed diesel cycles.
Case Drain Ports: Symmetrical ports T1 and T2 allow simple adaptation to horizontal or inclined installation attitudes without case over-pressurization.
| Pump Installation Specifications
| Complete Ordering Code Structure
HYH20V−L−O−[Size]−[Control]/10 [Rotation]−[Seal][Shaft][Flange][Ports][Through Drive]
| Position | Code Segment | Available Designations & Options | Technical Description & Functional Purpose |
|---|---|---|---|
| 01 | Axial Piston Unit | HYH20V / A20V | Swashplate design, variable double pump in back-to-back tandem arrangement |
| 02 | Charge Pump Version | L | Integrated centrifugal charge pump (impeller) for high-speed operation |
| 03 | Operating Mode | O | Open-circuit hydrostatic transmission |
| 04 | Frame Size | 190, 260 | Nominal displacement per rotary group in cm³/rev (2×192.7 or 2×260.0) |
| 05 | Control Devices | LR / LRDS / LRDH1 LRC / LR3 EP2D / EP2 / HD1D | LR / LRDS / LRDH1: Constant power controller, load sensing, pressure cut-off, and hydraulic stroke limiter (per A11VLO Data Sheet 92500) LRC / LR3: Cross-sensing power summation controller across both rotary groups or high-pressure related control EP2D / EP2 / HD1D: Electrohydraulic proportional control (24V DC EP2D) or hydraulic pilot-pressure control with pressure cut-off |
| 06 | Series | 10 | Series 1, Index 0 |
| 07 | Direction of Rotation | R, L | Clockwise (R) or Counter-clockwise (L), viewed facing drive shaft |
| 08 | Sealing Material | N, V | N: NBR nitrile rubber with FKM shaft seal ring; V: Full FKM fluorocarbon rubber seals |
| 09 | Drive Shaft Type | Z, T | Z: DIN 5480 involute splined shaft (W50 for 190, W60 for 260) T: Reinforced ANSI B92.1a splined shaft for heavy tandem drive (2 in 15T for 190, 2 1/4 in 17T for 260) |
| 10 | Mounting Flange | D, G | D: ISO 3019-1 4-hole flange (SAE 165-4 / SAE E) G: SAE J617 No. 3 combustion engine flywheel housing direct mount (Size 190) |
| 11 | Working Line Ports | 24 | SAE flanges, two ports (A and B) laterally opposite, common suction port S with metric DIN 13 fastening threads |
| 12 | Through-Drive Flange | N00, K01, K02, K04, K07 | N00: Without through drive K01/K52: SAE A 82-2 (9T / 11T) K02/K04: SAE B 101-2 (13T / 15T) K07: SAE C 127-2 (14T) |
| Reading Your Replacement Code
| Rexroth OEM Model Code | HENGYUHANG Drop-In Code | Dual Displacement | Operating Pressure | Control Execution | Drive Shaft & Mounting |
|---|---|---|---|---|---|
| A20VLO190LRDS/10R-NZD24K07 | HYH20VLO190LRDS/10R-NZD24K07 | 2×192.7 cm³/rev | 350 bar nom / 400 bar peak | Power + LS + Cut-off (LRDS) | DIN 5480 W50 Spline, SAE E 4-Bolt |
| A20VLO190LRDH1/10R-NTD24K04 | HYH20VLO190LRDH1/10R-NTD24K04 | 2×192.7 cm³/rev | 350 bar nom / 400 bar peak | Power + Cut-off + Stroke Limiter | ANSI 2" 15T Spline (T), SAE E 4-Bolt |
| A20VLO190EP2D/10R-NZD24K07 | HYH20VLO190EP2D/10R-NZD24K07 | 2×192.7 cm³/rev | 350 bar nom / 400 bar peak | Electrohydraulic Proportional 24V | DIN 5480 W50 Spline, SAE E 4-Bolt |
| A20VLO260LRDS/10R-NZD24K07 | HYH20VLO260LRDS/10R-NZD24K07 | 2×260.0 cm³/rev | 350 bar nom / 400 bar peak | Power + LS + Cut-off (LRDS) | DIN 5480 W60 Spline, SAE E 4-Bolt |
| A20VLO260LRDH1/10R-NTD24K07 | HYH20VLO260LRDH1/10R-NTD24K07 | 2×260.0 cm³/rev | 350 bar nom / 400 bar peak | Power + Cut-off + Stroke Limiter | ANSI 2 1/4" 17T Spline (T), SAE E 4-Bolt |
| A20VLO260EP2D/10R-NZD24K07 | HYH20VLO260EP2D/10R-NZD24K07 | 2×260.0 cm³/rev | 350 bar nom / 400 bar peak | Electrohydraulic Proportional 24V | DIN 5480 W60 Spline, SAE E 4-Bolt |
Technical Specifications of HENGYUHANG HYH20VLO Series 10 (Sizes 190 / 260, Integral Charge Pump)
4.1 Dual Rotary Group Performance Matrix (Data at atmospheric inlet pₐᵦₛ=0.8 bar at port S, mineral fluid ρ=0.88 kg/L)
| Performance Parameter | Unit | HYH20VLO190 | HYH20VLO260 |
|---|---|---|---|
| Max Displacement per Rotary Group (Vgₘₐₓ) | cm³/rev | 192.7 | 260.0 |
| Combined Maximum Displacement (2×Vgₘₐₓ) | cm³/rev | 385.4 | 520.0 |
| Minimum Displacement (Vg min) | cm³/rev | 0 | 0 |
| Maximum Continuous Input Speed (nₙₒₘ with Charge Pump at Vgₘₐₓ) | rpm | 2,500 | 2,300 |
| Limiting Input Speed (nₘₐₓ at reduced swivel angle) | rpm | 2,500 | 2,300 |
| Minimum Operating Speed (nₘᵢₙ) | rpm | 500 | 500 |
| Continuous Delivery Flow (qV at nₙₒₘ and Vgₘₐₓ) | L/min | 2×482 (combined 964 L/min) | 2×598 (combined 1,196 L/min) |
| Continuous Input Power (P at nₙₒₘ, Vgₘₐₓ and Δp=350 bar) | kW | 562 (753 HP) | 698 (936 HP) |
| Maximum Drive Torque (M_max at 2×Vgₘₐₓ and Δp=350 bar) | Nm | 2,147 | 2,897 |
| Maximum Permissible Input Torque on Shaft Z (M_E max DIN 5480) | Nm | 3,140 | 5,780 |
| Maximum Permissible Input Torque on Shaft T (M_E max ANSI B92.1a) | Nm | 2,670 | 4,070 |
| Rotary Stiffness of Drive Shaft Z (c) | kNm/rad | 346.2 | 686.5 |
| Rotary Stiffness of Drive Shaft T (c) | kNm/rad | 301.9 | 567.1 |
| Rotary Group Moment of Inertia (J_TW) | kg·m² | 0.1127 | 0.1773 |
| Maximum Permissible Angular Acceleration (α) | rad/s² | 6,800 | 4,800 |
| Housing Case Fluid Volume (Approx.) | L | 7.6 | 9.2 |
| Dry Weight without Through Drive (Approx.) | kg | 213 | 275 |
4.2 Operating Pressure Boundaries
| Pressure Characteristic | Permissible Value | Operational Definition & Safety Limits |
|---|---|---|
| Nominal Operating Pressure (pₙₒₘ) | 350 bar (5,100 psi) | Maximum continuous design fatigue pressure according to ISO/DIN standards |
| Maximum Peak Pressure (pₘₐₓ) | 400 bar (5,800 psi) | Maximum transient peak within single operating period (t<1.0 s, total accumulated ≤300 h) |
| Minimum Pressure on Working Ports A / B | ≥10 bar (145 psi) absolute | Minimum high-pressure side rating required to prevent rotary group unseating |
| Rate of Pressure Change (RAₘₐₓ) | 16,000 bar/s (232,000 psi/s) | Maximum permissible speed of pressure rise and drop across continuous duty |
| Suction Port Minimum Pressure (p_S min at Port S) | ≥0.6 bar (8.7 psi) absolute | Minimum inlet suction pressure enabled by the integral centrifugal charge pump |
| Suction Port Maximum Pressure (p_S max at Port S) | ≤2.0 bar (29 psi) absolute | Maximum permissible continuous pressure rating at port S |
| Case Drain Permissible Pressure (p_T at Ports T1, T2) | ≤2.0 bar (29 psi) absolute | Continuous case pressure; max 1.2 bar higher than inlet pressure at port S |
4.3 Hydraulic Fluid & Temperature Operational Limits
| Fluid Characteristic | Permissible Value | Operational Note |
|---|---|---|
| Recommended Fluid Media | Mineral oil (HLP to DIN 51524) | High-performance petroleum-based hydraulic fluid with anti-wear additives |
| Optimum Operating Viscosity (νₒₚₜ) | 16 to 36 mm²/s | Optimum balance of volumetric efficiency, response time, and bearing life |
| Continuous Operating Viscosity | 10 to 400 mm²/s | Full operational envelope with continuous temperature monitoring |
| Minimum Viscosity (νₘᵢₙ) | 7 to 10 mm²/s | Short-term limit (t≤3 min) at p≤0.3⋅pₙₒₘ, T_max=+85 ∘C (NBR) / +110 ∘C (FKM) |
| Maximum Viscosity at Cold Start (νₘₐₓ) | 1,600 mm²/s | Permissible at cold start (p≤50 bar, n≤0.5⋅nₙₒₘ, ϑ_St≥−25 ∘C, warm-up phase ≤3 min) |
| Permissible Fluid Temperature Range | −25 ∘C to +110 ∘C (−13 ∘F to +230 ∘F) | Full operating phase with standard FKM dynamic seals (NBR rated to +85 ∘C) |
| Fluid Cleanliness Class | ISO 4406 Class 20/18/15 | At elevated temperatures (>90 ∘C), maintain Class 19/17/14 minimum |
Product Advantages
High-Speed Diesel Direct Drive with Integral Charge Pump
The internal impeller charge pump delivers positive head pressure directly to the cylinder barrel bores, raising allowable continuous input speed to 2,500 rpm (Size 190) and 2,300 rpm (Size 260) without requiring an external boost circuit or pressurized tank.
True 350 Bar Continuous / 400 Bar Peak Heavy-Duty Power
Built upon proven A11VLO Series 1x rotary components, featuring high-strength ductile iron housings, bi-metal cylinder barrels, and heavy-duty hydrostatic cradle bearings engineered for severe cyclic pressure spikes.
Dual Independent High-Flow Hydraulic Circuits
Delivers up to 2×598 L/min from two independently controlled swashplates, enabling synchronized multi-actuator movements (e.g. excavator boom, stick, and dual tracks) without circuit cross-interference.
External Power Adjustment Under Load
Dynamic mechanical and electronic power controller adjustments can be performed externally while the diesel engine and hydraulic system are fully loaded, optimizing fuel consumption and cycle speeds.
Full Auxiliary Through-Drive Compounding
Equipped with rear SAE and ISO through-drive flange options (SAE A, B, C) capable of transmitting full auxiliary torque to secondary pilot gear pumps or swing circuit pumps.
Seamless 1:1 OEM Drop-In Interchangeability
Engineered down to the millimeter to match Bosch Rexroth A20VLO Series 10 mounting flanges, shaft splines, port locations, and control interfaces with zero machine modification required.
| Interchangeability & Cross Reference
6.1 Direct Replacement Matrix: Bosch Rexroth A20VLO to HENGYUHANG HYH20VLO
| OEM Model Code | Displacement Band | Operating Pressure | Built-in Features | Mounting & Porting | HENGYUHANG 1:1 Replacement |
| A20VLO190LRDS/10R-NZD24K07 | 2×192.7 cm³/rev | 350 bar nom / 400 bar peak | Integral Impeller, Power + LS Control | SAE E 4-Hole, SAE 1 1/2" Ports A/B, 5" Port S | HYH20VLO190LRDS/10R-NZD24K07 |
| A20VLO190LRDH1/10R-NTD24K04 | 2×192.7 cm³/rev | 350 bar nom / 400 bar peak | Integral Impeller, Power + Stroke Limiter | SAE E 4-Hole, ANSI 2" 15T Spline (T) | HYH20VLO190LRDH1/10R-NTD24K04 |
| A20VLO190EP2D/10R-NZD24K07 | 2×192.7 cm³/rev | 350 bar nom / 400 bar peak | Integral Impeller, Electrohydraulic 24V | SAE E 4-Hole, SAE 1 1/2" Ports A/B, 5" Port S | HYH20VLO190EP2D/10R-NZD24K07 |
| A20VLO260LRDS/10R-NZD24K07 | 2×260.0 cm³/rev | 350 bar nom / 400 bar peak | Integral Impeller, Power + LS Control | SAE E 4-Hole, SAE 1 1/2" Ports A/B, 5" Port S | HYH20VLO260LRDS/10R-NZD24K07 |
| A20VLO260LRDH1/10R-NTD24K07 | 2×260.0 cm³/rev | 350 bar nom / 400 bar peak | Integral Impeller, Power + Stroke Limiter | SAE E 4-Hole, ANSI 2 1/4" 17T Spline (T) | HYH20VLO260LRDH1/10R-NTD24K07 |
| A20VLO260EP2D/10R-NZD24K07 | 2×260.0 cm³/rev | 350 bar nom / 400 bar peak | Integral Impeller, Electrohydraulic 24V | SAE E 4-Hole, SAE 1 1/2" Ports A/B, 5" Port S | HYH20VLO260EP2D/10R-NZD24K07 |
6.2 Modular Controller Functionality Mapping
| Primary Control Function | Rexroth A20VLO Code | HENGYUHANG Functional Equivalent | Operational Characteristic |
| Constant Pressure Limiter | DR / DRG | HYH-DR / HYH-DRG | Destrokes both pumps at preset pressure cut-off; remote pilot relief via port GA/GB |
| Load-Sensing Flow Control | DRS / DRSC | HYH-DRS / HYH-DRSC | Regulates pump displacement to maintain constant differential across main control valve orifices |
| Hyperbolic Power Limiter | LR / LRDS | HYH-LR / HYH-LRDS | Limits total combined engine torque absorption across both rotary groups to prevent engine stall |
| Power + Stroke Limiter | LRDH1 / LRDH2 | HYH-LRDH1 / HYH-LRDH2 | Combines hyperbolic power limiting, pressure cut-off, and hydraulic stroke limitation (Δp = 25 bar) |
| Electrohydraulic Pilot Control | EP2D / EP2 | HYH-EP2D / HYH-EP2 | Digital proportional solenoid regulation with integrated pressure cut-off (24V DC DEUTSCH connector) |
| Brand Replacement
Bosch Rexroth (Primary 1:1 direct interchangeability for A20VLO Series 10 variable double pumps with charge pump)
Kawasaki (K3V180DT / K5V200DTH / K3V280DT Series) and Uchida-Rexroth tandem excavator pump retrofits engineered upon request
Caterpillar, Komatsu, and Hitachi mining excavator dual main pump replacements with customized mounting flanges and shaft splines
| Applications
Heavy Mining & Quarrying Excavators (50T–120T): Primary dual main hydraulic power source for heavy boom, stick, bucket, and dual travel drive motors.
Heavy Demolition & Scrap Recyclers: Dedicated independent dual circuits for continuous high-pressure shear crushing and rapid arm positioning.
Large Mobile Harbour Cranes & Container Handlers: High-speed, high-flow supplies for main hoisting winches, luffing cylinders, and continuous slewing.
Deep Rotary Drilling Rigs & Piling Machinery: Independent dual circuits driving high-torque power swivel heads and heavy crowd winches.
Material Handling & Scrap Grapple Machines: Smooth multi-actuator coordination with optimized diesel fuel efficiency and anti-stall power regulation.
Offshore Deck Winch & Dredging Systems: Continuous dual-flow high-pressure hydraulic power units operating under high ambient marine environments.
| Packaging & Shipping
| Packaging Layer | Specification & Protection Material | Safety Standard |
| Inner Protection | Corrosion-inhibiting VCI plastic wrap, desiccants, and heavy-duty port thread plugs | Prevents moisture, atmospheric corrosion, and debris contamination |
| Shock Cushioning | Custom-molded high-density expanded polyethylene (EPE) foam enclosure | Absorbs severe multi-axis transit impacts and protects shaft extensions |
| Outer Enclosure | ISPM-15 export-certified solid fumigation-free engineered wooden crate | Structural reinforcement for global ocean, air, and multimodal handling |
| Logistics Options | Express Courier (DHL, FedEx, UPS), Air Freight, LCL/FCL Ocean Cargo, DDP door-to-door | Dispatch in 48–72 hours for standard configurations; tailored tracking provided |
| Why Choose Hengyuhang?
Direct Factory Precision Manufacturing & CNC Excellence: State-of-the-art multi-axis CNC machining centers, precision spherical grinding equipment, and sub-micron gear and bearing fitment (Ra < 0.2 μm) guarantee superior rotary group alignment and low internal leakage.
100% Full-Cycle Multi-Parameter Factory Inspection: Every HYH20VLO double pump undergoes automated dual-circuit test-bench trials verifying volumetric efficiency (> 94%), continuous and peak pressure hold at 350/400 bar, charge pump boost pressure, response hysteresis, and vibration/noise spectra prior to dispatch.
Seamless 1:1 OEM Drop-In Interchangeability: Engineered to match European DIN, ISO, and SAE standards down to the millimeter, allowing immediate replacement of Bosch Rexroth A20VLO Series 10 units with zero pipe rework or bracket modification.
Flexible Engineering Customization & Rapid Prototyping: In-house hydraulic engineering team provides tailored control-valve calibrations, special shaft profiles, auxiliary flushing ports, and rapid prototype turnarounds with minimal MOQ requirements.
Robust Supply Chain, Extensive Inventory & Fast Global Dispatch: Continuous inventory of finished cast bodies, bearing kits, rotary groups, and modular controllers enables standardized orders to ship globally within 48 to 72 hours.
12-Month Comprehensive Warranty & Lifetime Technical Support: All units are backed by an unconditional 12-month factory warranty, 24-hour drawing verification service, and lifetime engineering consultation from certified fluid power specialists.
HENGYUHANG Axial Piston Variable Double Pump HYH20VLO Series 10 (Variable Swashplate Open-Circuit Hydraulic Double Pump With Integrated Charge Pump, 2×192.70~2×260.00 cm³/rev) is a high-pressure, heavy-duty axial piston variable double pump incorporating two swashplate rotary groups arranged back-to-back in a common housing and equipped with an integrated centrifugal charge pump for demanding open-circuit hydrostatic drive systems in mobile machinery, heavy mining excavators, drilling rigs, and industrial power packs. Manufactured by Quanzhou Hengyuhang Power Technology Co., Ltd. as an engineered, direct-fit replacement line designed to match the benchmark performance, mounting dimensions, pressure ratings, and hydraulic characteristics of the Rexroth A20VLO Series 10 (RE 93100), the HYH20VLO Series 10 is built using proven, field-tested components from the heavy-duty HYH11VLO Series 1x (RE 92500) swashplate rotary group family. By incorporating an integrated centrifugal auxiliary impeller (charge pump) on frame sizes 190 and 260 cm³/rev, the HYH20VLO achieves superior self-priming capability and eliminates inlet cavitation risks at elevated rotational speeds, allowing continuous nominal operation at up to 2500 rpm on Size 190 and 2300 rpm on Size 260. Operating at a nominal continuous working pressure of 350 bar (5100 psi / 35 MPa) and a maximum peak pressure of 400 bar (5800 psi / 40 MPa), the HYH20VLO delivers simultaneous dual-flow outputs of up to 2 × 482 L/min (964.0 L/min total) on Size 190 and 2 × 598 L/min (1196.0 L/min total) on Size 260 from a single prime mover input. The series features heavy-duty tapered roller swashplate bearings, dual independent displacement controls per rotary group, external power setting capability during machine operation, and a universal 100% full-torque rear through-drive capable of mounting secondary gear or piston pumps without splitter gearboxes. Supported by hyperbolic power limiters (LR/LRD/LRDS), cross-sensing power summation (LR.C), load-sensing flow matching (DRS), electric proportional overrides (LE2), hydraulic pilot controls (HD2), and electrohydraulic servo valves (EC4/EB4), the HYH20VLO Series 10 provides a proven, drop-in replacement solution for heavy-duty multi-circuit open hydraulic systems.
| Applications
The HYH20VLO Series 10 variable double pump with charge pump is engineered specifically for heavy-duty, high-flow open-circuit hydraulic systems requiring high drive speeds, continuous 350 bar operation, and independent twin-circuit power transmission from a single prime mover:
Heavy Mining Excavators & High-Tonnage Diggers: Dedicated twin-circuit hydraulic power supply for boom lift, stick crowd, bucket curl, and independent dual-track crawler travel drives on 50-ton to 200-ton mining excavators operating under high diesel engine speeds.
Rotary Drilling Rigs & Heavy Piling Equipment: Supplies continuous 350 bar hydraulic power for rotary powerhead drive on circuit 1 while simultaneously powering mast elevation, crowd winches, and casing oscillators on circuit 2.
Mobile All-Terrain, Rough-Terrain & Crawler Cranes: Dual-circuit power delivery for multi-fall main hoist winches, auxiliary hoist lines, telescopic boom multi-stage extension cylinders, and proportional hydraulic slewing drives.
Concrete Boom Pumps & Heavy Placing Equipment: High-flow, high-pressure twin-stream delivery for concrete pumping cylinders and rapid hydraulic S-tube switching valve actuation under continuous high duty cycles.
Heavy Industrial Power Skids & Scrap Balers: Large-displacement twin power supply (up to 1196 L/min total delivery) for high-tonnage scrap shears, forging manipulators, extrusion presses, and offshore winch drive skids.
Single-Engine Multi-Pump Machinery (Splitter Gearbox Elimination): Directly couples two 350 bar high-capacity pumps back-to-back on a single diesel engine flywheel shaft, utilizing standardized SAE A, B, and C rear through-drives to mount auxiliary pilot and steering pumps.
| Key Specifications Overview
| Parameter | Hengyuhang HYH20VLO Series 10 Specification (OEM Benchmark Standard) |
|---|---|
| Pump Classification | Axial Piston Variable Double Pump in Swashplate Design with Integrated Charge Pump for Open Circuits (HYH20VLO Series 10) |
| OEM Interchange Reference | Direct 1:1 physical, dimensional, and hydraulic drop-in replacement for Rexroth A20VLO Series 10 (Sizes 190 and 260, RE 93100) |
| Displacement Size Range | High-Capacity Double Frame Sizes: HYH20VLO-190 (2 × 192.7 cm³/rev) and HYH20VLO-260 (2 × 260.0 cm³/rev) |
| Integrated Charge Pump (Auxiliary Impeller) | Internal centrifugal charge impeller boosts fluid intake at suction port S, preventing cavitation and enabling elevated drive speeds |
| Modular Architecture Pedigree | Built from proven rotary group components of the HYH11VLO Series 1x (Data Sheet RE 92500) high-pressure pump family |
| Nominal Continuous Pressure (pnom) | 350 bar (5100 psi / 35 MPa) continuous working pressure at both service ports A and B (high-pressure side) |
| Maximum Peak Operating Pressure (pmax) | 400 bar (5800 psi / 40 MPa) maximum intermittent peak pressure (single operating period < 1 s; total cumulative period: 300 h) |
| Minimum Pressure at High-Pressure Port (pabs min) | Hydraulic holding pressure required on high-pressure side to prevent internal slipper shoe separation during deceleration |
| Rate of Pressure Change (RA max) | 16,000 bar/s (232,060 psi/s) maximum permissible rate of pressure build-up and reduction across entire pressure range |
| Nominal Rotational Speed (at Vg max, pabs = 0.8 bar) | HYH20VLO-190: n_nom = 2500 rpm; HYH20VLO-260: n_nom = 2300 rpm (boosted speed tier enabled by integrated charge pump) |
| Minimum Operating Speed (n_min) | 500 rpm continuous minimum drive speed across all displacement sizes |
| Suction Pressure Range (Port S Inlet) | Minimum inlet pressure pS min ≥ 0.6 bar absolute (8.7 psi) to prevent cavitation; Maximum allowable suction pressure pS max ≤ 2 bar absolute (29 psi) |
| Case Drain Pressure Rating (Ports T1, T2) | Maximum continuous case pressure pL max ≤ 2 bar absolute (30 psi); Case pressure must always exceed ambient pressure |
| Rotary Group & Swashplate Technology | Dual back-to-back swashplate rotary groups with shared drive shaft, hardened cylinder barrels, and heavy-duty cradle bearings |
| Mounting Flange Standards | ISO 3019-1 (SAE J744 165-4 / SAE E 4-bolt: Pilot Ø165.1 mm, pitch circle Ø224.5 mm); Optional Code G: SAE J617 flywheel housing (Size 190) |
| Drive Shaft Configurations | Splined shaft DIN 5480 Code Z (W50 on Size 190, W60 on Size 260); Splined shaft ANSI B92.1a Code T (2 in 15T 8/16DP on both sizes) |
| Working Fluid Ports (Dual Outlet A, B / B1, B2) | SAE J518 / ISO 6162-2 Code 62 High Pressure: 1 1/2 in (400 bar rated, M16×2 fastening thread, 21 mm deep) |
| Suction Fluid Port (Shared Single Inlet S) | SAE J518 / ISO 6162-1 Code 61 Standard Pressure: 5 in (30 bar rated, M16×2 fastening thread, 23 mm deep) |
| Case Drain & Air Bleed Ports (T1, T2, R) | DIN 3852 M33×2 metric threaded ports (Drain T1, T2: 18 mm deep; Air bleed R: 16 mm deep, 10 bar rated) |
| Measuring & Gauge Ports (MA, MB, M1, GA, GB) | DIN 3852 M12×1.5 (Working pressure MA, MB and control pressure M1; 400 bar); DIN 3852 M14×1.5 (Pilot control GA, GB; 40 bar) |
| Sealing Material System | Code V: Premium FKM (fluorocarbon rubber) standard (-25°C to +110°C); Code N: NBR with FKM shaft seal ring (-40°C to +90°C) |
| Direction of Rotation | Clockwise (Code R) or Counter-Clockwise (Code L), viewed facing input drive shaft |
| Operating Viscosity Range | Optimum: νopt = 16 to 36 mm²/s; Permissible: ν = 10 to 400 mm²/s; Maximum cold start: νmax ≤ 1600 mm²/s |
| Fluid Cleanliness Standard | ISO 4406 Class 20/18/15 minimum (Class 19/17/14 recommended for high operating temperatures or extended life) |
| Through-Drive Capability | 100% full-torque through-drive rear mountings (SAE A, B, C) for mounting auxiliary gear or piston pumps up to same frame size |
| Technical Performance Matrix Across Available Sizes
| ■ High-Speed Boosted Variable Double Pump Series with Charge Pump (HYH20VLO — 350 bar Nominal / 400 bar Peak Benchmark) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Model Number (Hengyuhang Series) | Displacement per Group (cm³) | Drive Speed (rpm) | Total Delivery Flow @ n_nom (L/min) | Nominal Pressure pnom (bar) | Drive Power @ 350 bar (kW) | Drive Torque @ 350 bar (Nm) | Shaft Stiffness c (kNm/rad) | Inertia JTW (kg·m²) | Case Fill (L) | Unit Mass m w/o thru (kg) | ||
| Nominal n_nom | Max n_max | Shaft Z | Shaft T | |||||||||
| HYH20VLO-190 | 192.70 (2×192.7) | 2500 | 2500 | 2 × 482 (964.0) | 350 | 562.0 | 2147.0 | 346.2 | 301.9 | 0.1127 | 7.60 | 213.0 |
| HYH20VLO-260 | 260.00 (2×260.0) | 2300 | 2300 | 2 × 598 (1196.0) | 350 | 698.0 | 2897.0 | 686.5 | 567.1 | 0.1773 | 9.20 | 275.0 |
| Reference: Standard Naturally Aspirated Double Pump Architecture (HYH20VO / HYH20VNO Family Cross-Reference) | ||||||||||||
| HYH20VO-60 (Ref) | 60.00 (2×60.0) | 2700 | 3140 | 2 × 162 (324.0) | 250 | 135.0 | 477.0 | – | 65.5 (S) | 0.0113 | 1.60 | 44.0 |
| HYH20VO-72 (Ref) | 72.00 (2×72.0) | 2600 | 3140 | 2 × 187 (374.0) | 250 | 154.0 | 572.0 | – | 65.5 (S) | 0.0113 | 1.60 | 44.0 |
| HYH20VNO-85 (Ref) | 85.00 (2×85.0) | 2700 | – | 2 × 230 (460.0) | 210 | 160.0 | 568.0 | – | 65.5 (S) | 0.0113 | 1.60 | 44.0 |
| HYH20VO-95 (Ref) | 93.80 (2×93.8) | 2350 | 2780 | 2 × 220 (440.0) | 350 | 257.0 | 1045.0 | 199.6 | 173.7 (S) | 0.0346 | 4.20 | 107.0 |
| HYH20VO-520 (Ref) | 520.00 (2×520.0) | 1450 | 1720 | 2 × 754 (1508.0) | 350 | 880.0 | 5793.0 | 1136.0 | – | 0.6960 | 28.00 | 640.0 |
| Control Devices & Operating Mechanisms
| Control Code | Control Classification | Control Signal & Pilot Supply | Functional Operation & Machine Circuit Application |
|---|---|---|---|
| LR / LRD | Power Controller with Pressure Cut-Off | Internal hydraulic pressure sensing with hyperbolic spring package | Maintains constant prime mover horsepower absorption along a hyperbolic curve; automatically swivels pump towards zero flow when preset working pressure is reached. |
| LRDS | Power Controller with Pressure Cut-Off & Load-Sensing | Load pressure signal connected at pilot port X with differential spool | Combines hyperbolic horsepower limiting, maximum system pressure cut-off, and hydraulic load-sensing flow matching to ensure optimal multi-actuator excavating efficiency. |
| LR.C | Power Controller with Cross-Sensing Summation | Pilot interconnect line between dual pumps in tandem or parallel | Summation power control for twin-pump hydraulic excavators; dynamically balances displacement between circuits to maintain total engine power utilization without stall. |
| LE2 / LE2S | Power Controller with Electric Proportional Override | Proportional electric current signal (24V DC solenoid, DEUTSCH DT04-2P) | Allows dynamic electronic adjustment of the hyperbolic power setting from the vehicle management system (ECU) based on engine speed and working modes. |
| DR / DRS / DRG | Pressure Controller / Load-Sensing / Remote Pressure | Hydraulic pressure sensing; port X for load-sensing (DRS) or remote relief (DRG) | Maintains constant circuit pressure (DR), matches output flow directly to proportional control valve demand (DRS), or permits remote multi-stage pressure setting (DRG). |
| HD2 / HD2D | Hydraulic Proportional Displacement Control | Hydraulic pilot pressure signal (Δp = 25 bar) at pilot port Y | Direct proportional adjustment of swashplate tilt angle and pump displacement via an external hydraulic pilot pressure signal, available with pressure cut-off (HD2D). |
| EP2 / EP2D | Electrical Proportional Displacement Control | Proportional electric current (24V DC solenoid) with spring return | Electrical proportional displacement positioning; pump displacement increases proportionally with control current, available with hydraulic pressure cut-off (EP2D). |
| EC4 / EB4 | Electrohydraulic Control Valve with Swivel Angle Sensor | Electric current 12V/24V DC with integrated Hall swivel angle sensor PAL | Direct closed-loop electrohydraulic displacement control with real-time electronic angle position feedback for advanced digital mobile machinery controls. |
| Mounting Flange, Shaft and Port Specifications Across Sizes
| Mechanical Installation Interface (Mounting Flange & Drive Shaft) | ||
|---|---|---|
| Frame Size Model | Mounting Flange Standards | Drive Shaft Options (Splined Standards & Torque Limits) |
| HYH20VLO-190 | Code D: ISO 3019-1 (SAE J744 165-4 / SAE E 4-bolt: Pilot Ø165.1 mm, pitch circle Ø224.5 mm); Optional Code G: SAE J617 flywheel housing | Code Z: Splined shaft DIN 5480 W50×2×24×9g (ME max = 3140 Nm); Code T: Splined shaft ANSI B92.1a 2 in 15T 8/16DP (ME max = 2770 Nm) |
| HYH20VLO-260 | Code D: ISO 3019-1 (SAE J744 165-4 / SAE E 4-bolt: Pilot Ø165.1 mm, pitch circle Ø224.5 mm) | Code Z: Splined shaft DIN 5480 W60×2×28×9g (ME max = 5780 Nm); Code T: Splined shaft ANSI B92.1a 2 in 15T 8/16DP (ME max = 4680 Nm) |
| Fluid Port Configuration (Service, Suction, Drain, Air Bleed & Gauge Ports) | |||||
|---|---|---|---|---|---|
| Frame Size Model | Dual Working Ports A, B | Shared Suction Port S | Case Drain Ports T1, T2 | Air Bleed Port R | Gauge & Pilot Ports |
| HYH20VLO-190 | SAE J518 Code 62 1 1/2 in (400 bar, M16×2; 21 deep) | SAE J518 Code 61 5 in (30 bar, M16×2; 23 deep) | DIN 3852 M33×2; 18 deep (10 bar) | DIN 3852 M33×2; 16 deep (10 bar) | MA, MB, M1: M12×1.5; GA, GB: M14×1.5 |
| HYH20VLO-260 | SAE J518 Code 62 1 1/2 in (400 bar, M16×2; 21 deep) | SAE J518 Code 61 5 in (30 bar, M16×2; 23 deep) | DIN 3852 M33×2; 18 deep (10 bar) | DIN 3852 M33×2; 16 deep (10 bar) | MA, MB, M1: M12×1.5; GA, GB: M14×1.5 |
| Through-Drive Options and Multi-Pump Combinations
| Through-Drive Code | Mounting Flange Standard | Internal Splined Coupling Hub | Applicable Frame Sizes & Auxiliary Pump Combinations |
|---|---|---|---|
| N00 | Without through drive | None (closed rear housing end) | Single double-pump standalone configuration for high-flow excavator implement circuits |
| K01 | ISO 3019-1 82-2 (SAE A 2-bolt) | Spline ANSI B92.1a 5/8 in 9T 16/32DP | Mounting auxiliary external gear pumps AZPF or HYH10VO-10/18 for pilot control or brake charge |
| K02 | ISO 3019-1 101-2 (SAE B 2-bolt) | Spline ANSI B92.1a 7/8 in 13T 16/32DP | Mounting auxiliary gear pumps AZPN/AZPG or HYH10VO-28/45 for auxiliary cooling and steering circuits |
| K04 | ISO 3019-1 101-2 (SAE B 2-bolt) | Spline ANSI B92.1a 1 in 15T 16/32DP | Mounting secondary HYH10VO-45/60 or HYH11VO-40 piston pumps for auxiliary mobile work circuits |
| K07 | ISO 3019-1 127-2 (SAE C 2-bolt) | Spline ANSI B92.1a 1 1/4 in 14T 12/24DP | Mounting secondary HYH10VO-71/85/100 or HYH11VO-60 piston pumps up to full secondary power transfer |
| Direct Interchangeability and OEM Replacement Matrix (Rexroth A20VLO Series 10)
| Hengyuhang Series Model | Rexroth OEM Reference Model (A20VLO Series 10) | Interchangeability Verification Status |
|---|---|---|
| HYH20VLO-190 | A20VLO 190 LRDS / 10R-NZD24K04 | 100% Direct Physical, Dimensional & Hydraulic Drop-in Replacement |
| HYH20VLO-190 | A20VLO 190 LR.C / 10R-NZD24K07 | 100% Direct Physical, Dimensional & Hydraulic Drop-in Replacement |
| HYH20VLO-190 | A20VLO 190 LE2S / 10R-NZD24N00 | 100% Direct Physical, Dimensional & Hydraulic Drop-in Replacement |
| HYH20VLO-260 | A20VLO 260 LRDS / 10R-NZD24K04 | 100% Direct Physical, Dimensional & Hydraulic Drop-in Replacement |
| HYH20VLO-260 | A20VLO 260 LR.C / 10R-NZD24K07 | 100% Direct Physical, Dimensional & Hydraulic Drop-in Replacement |
| HYH20VLO-260 | A20VLO 260 LE2S / 10R-NZD24N00 | 100% Direct Physical, Dimensional & Hydraulic Drop-in Replacement |
| Model Coding & Ordering Structure
| Position | Code Segment | Available Standard Options | Technical Definition & Feature Description |
|---|---|---|---|
| [01] | Unit Type | HYH20V | Variable swashplate double pump with two rotary groups arranged in back-to-back architecture |
| [02] | Additional Function | L | Code L: With integrated centrifugal charge pump / auxiliary impeller for high-speed operation (Sizes 190 and 260) |
| [03] | Operating Mode | O | Code O: Open circuit double pump |
| [04] | Frame Size | 190 / 260 | Geometric displacement per rotary group in cm³/rev (192.7 cm³ and 260.0 cm³) |
| [05] | Control Device | LR / LRD / LRDS / LR.C / LE2 / LE2S DR / DRS / DRG / HD2 / HD2D EP2 / EP2D / EC4 / EB4 | Hyperbolic power controllers, cross-sensing summation, load-sensing flow matching, electric proportional overrides, and electrohydraulic servo valves (Data Sheet RE 92500) |
| [06] | Series & Index | 10 | Series 1, Index 0 |
| [07] | Direction of Rotation | R / L | Code R: Clockwise; Code L: Counter-Clockwise (viewed facing drive shaft) |
| [08] | Sealing Material | V / N | Code V: Premium FKM standard (-25°C to +110°C); Code N: NBR with FKM shaft seal ring (-40°C to +90°C) |
| [09] | Drive Shaft | Z / T | Code Z: Splined shaft DIN 5480 (W50 on 190, W60 on 260) Code T: Splined shaft ANSI B92.1a 2 in 15T 8/16DP (Sizes 190 and 260) |
| [10] | Mounting Flange | D / G | Code D: ISO 3019-1 165-4 (SAE J744 165-4 / SAE E 4-bolt: Pilot Ø165.1 mm, pitch circle Ø224.5 mm) Code G: Based on SAE J617 flywheel housing (Size 190) |
| [11] | Working Ports | 24 | Code 24: Two working ports (A, B) and one shared suction port S laterally opposite, metric DIN 13 fastening threads |
| [12] | Through Drive | N00 / K01 / K02 / K04 / K07 | Code N00: Without through drive; Codes K01~K07: Rear mounting attachments (SAE A, SAE B, SAE C) for secondary gear or piston pumps |
| Technical Performance Matrix Across Available Sizes
| ■ High-Speed Boosted Variable Double Pump Series with Charge Pump (HYH20VLO — 350 bar Nominal / 400 bar Peak Benchmark) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Model Number (Hengyuhang Series) | Displacement per Group (cm³) | Drive Speed (rpm) | Total Delivery Flow @ n_nom (L/min) | Nominal Pressure pnom (bar) | Drive Power @ 350 bar (kW) | Drive Torque @ 350 bar (Nm) | Shaft Stiffness c (kNm/rad) | Inertia JTW (kg·m²) | Case Fill (L) | Unit Mass m w/o thru (kg) | ||
| Nominal n_nom | Max n_max | Shaft Z | Shaft T | |||||||||
| HYH20VLO-190 | 192.70 (2×192.7) | 2500 | 2500 | 2 × 482 (964.0) | 350 | 562.0 | 2147.0 | 346.2 | 301.9 | 0.1127 | 7.60 | 213.0 |
| HYH20VLO-260 | 260.00 (2×260.0) | 2300 | 2300 | 2 × 598 (1196.0) | 350 | 698.0 | 2897.0 | 686.5 | 567.1 | 0.1773 | 9.20 | 275.0 |
| Reference: Standard Naturally Aspirated Double Pump Architecture (HYH20VO / HYH20VNO Family Cross-Reference) | ||||||||||||
| HYH20VO-60 (Ref) | 60.00 (2×60.0) | 2700 | 3140 | 2 × 162 (324.0) | 250 | 135.0 | 477.0 | – | 65.5 (S) | 0.0113 | 1.60 | 44.0 |
| HYH20VO-72 (Ref) | 72.00 (2×72.0) | 2600 | 3140 | 2 × 187 (374.0) | 250 | 154.0 | 572.0 | – | 65.5 (S) | 0.0113 | 1.60 | 44.0 |
| HYH20VNO-85 (Ref) | 85.00 (2×85.0) | 2700 | – | 2 × 230 (460.0) | 210 | 160.0 | 568.0 | – | 65.5 (S) | 0.0113 | 1.60 | 44.0 |
| HYH20VO-95 (Ref) | 93.80 (2×93.8) | 2350 | 2780 | 2 × 220 (440.0) | 350 | 257.0 | 1045.0 | 199.6 | 173.7 (S) | 0.0346 | 4.20 | 107.0 |
| HYH20VO-520 (Ref) | 520.00 (2×520.0) | 1450 | 1720 | 2 × 754 (1508.0) | 350 | 880.0 | 5793.0 | 1136.0 | – | 0.6960 | 28.00 | 640.0 |
| Hengyuhang Series Model | Rexroth OEM Reference Model (A20VLO Series 10) | Interchangeability Verification Status |
|---|---|---|
| HYH20VLO-190 | A20VLO 190 LRDS / 10R-NZD24K04 | 100% Direct Physical, Dimensional & Hydraulic Drop-in Replacement |
| HYH20VLO-190 | A20VLO 190 LR.C / 10R-NZD24K07 | 100% Direct Physical, Dimensional & Hydraulic Drop-in Replacement |
| HYH20VLO-190 | A20VLO 190 LE2S / 10R-NZD24N00 | 100% Direct Physical, Dimensional & Hydraulic Drop-in Replacement |
| HYH20VLO-260 | A20VLO 260 LRDS / 10R-NZD24K04 | 100% Direct Physical, Dimensional & Hydraulic Drop-in Replacement |
| HYH20VLO-260 | A20VLO 260 LR.C / 10R-NZD24K07 | 100% Direct Physical, Dimensional & Hydraulic Drop-in Replacement |
| HYH20VLO-260 | A20VLO 260 LE2S / 10R-NZD24N00 | 100% Direct Physical, Dimensional & Hydraulic Drop-in Replacement |
| Position | Code Segment | Available Standard Options | Technical Definition & Feature Description |
|---|---|---|---|
| [01] | Unit Type | HYH20V | Variable swashplate double pump with two rotary groups arranged in back-to-back architecture |
| [02] | Additional Function | L | Code L: With integrated centrifugal charge pump / auxiliary impeller for high-speed operation (Sizes 190 and 260) |
| [03] | Operating Mode | O | Code O: Open circuit double pump |
| [04] | Frame Size | 190 / 260 | Geometric displacement per rotary group in cm³/rev (192.7 cm³ and 260.0 cm³) |
| [05] | Control Device | LR / LRD / LRDS / LR.C / LE2 / LE2S DR / DRS / DRG / HD2 / HD2D EP2 / EP2D / EC4 / EB4 | Hyperbolic power controllers, cross-sensing summation, load-sensing flow matching, electric proportional overrides, and electrohydraulic servo valves (Data Sheet RE 92500) |
| [06] | Series & Index | 10 | Series 1, Index 0 |
| [07] | Direction of Rotation | R / L | Code R: Clockwise; Code L: Counter-Clockwise (viewed facing drive shaft) |
| [08] | Sealing Material | V / N | Code V: Premium FKM standard (-25°C to +110°C); Code N: NBR with FKM shaft seal ring (-40°C to +90°C) |
| [09] | Drive Shaft | Z / T | Code Z: Splined shaft DIN 5480 (W50 on 190, W60 on 260) Code T: Splined shaft ANSI B92.1a 2 in 15T 8/16DP (Sizes 190 and 260) |
| [10] | Mounting Flange | D / G | Code D: ISO 3019-1 165-4 (SAE J744 165-4 / SAE E 4-bolt: Pilot Ø165.1 mm, pitch circle Ø224.5 mm) Code G: Based on SAE J617 flywheel housing (Size 190) |
| [11] | Working Ports | 24 | Code 24: Two working ports (A, B) and one shared suction port S laterally opposite, metric DIN 13 fastening threads |
| [12] | Through Drive | N00 / K01 / K02 / K04 / K07 | Code N00: Without through drive; Codes K01~K07: Rear mounting attachments (SAE A, SAE B, SAE C) for secondary gear or piston pumps |
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