Piston pump
HENGYUHANG Axial Piston Variable Pump HYH10VO Series 31
HENGYUHANG HYH10VO Series 31 is a heavy-duty swashplate axial piston variable displacement pump engineered for open-circuit hydrostatic systems, delivering continuous 280 bar nominal pressure (350 bar peak), dual case drain ports, high power-to-weight ratio, and full 100% through-drive capability across mobile and industrial hydraulic applications.
| Applications
Engineered for demanding open-loop hydraulic circuits in mobile and stationary machinery including excavators, concrete pump trucks, mobile cranes, drilling rigs, material handling loaders, agricultural tractors, forestry harvesters, and industrial hydraulic power packs requiring rugged 280 bar continuous pressure capability, versatile load-sensing or power regulation, and multi-pump compound through-drives.
| Key Technical Specifications
Product Model: HYH10VO Series 31 (Sizes 18, 28, 45, 71, 88, 100)
Brand Replacement: Bosch Rexroth A10VO Series 31 (Sizes 18, 28, 45, 71, 88, 100; open circuit), OEM or as requested.
Displacement: 18.0 / 28.0 / 45.0 / 71.0 / 88.0 / 100.0 cm³/rev
Rotation Direction: Clockwise (R) or Counter-clockwise (L), viewed from drive shaft end
Speed Range: Standard nominal rating n nom 2,000–3,300 rpm at Vg max (High-Speed version up to 2,300–3,000 rpm; permissible speed n max perm up to 2,400–3,900 rpm at reduced displacement; minimum operating speed n min = 500 rpm)
Peak Pressure: Nominal continuous pressure p nom = 280 bar (4,100 psi) / Maximum peak pressure p max = 350 bar (5,100 psi)
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| Overview of HENGYUHANG HYH10VO Series 31 Hydraulic Pumps
The HENGYUHANG HYH10VO Series 31 is a proven swashplate-design axial piston variable displacement pump engineered specifically for open-circuit hydrostatic drive systems requiring medium-to-high working pressure. Manufactured as a direct 1:1 drop-in replacement for the industry-standard Bosch Rexroth A10VO Series 31 product line, this series covers all six primary frame sizes: 18, 28, 45, 71, 88, and 100 cm³/rev.
Delivery flow is proportional to input drive speed and cradle swashplate angle, allowing stepless variation between maximum displacement and zero flow. Engineered with robust bi-metallic cylinder barrel technology, heavy-duty rotary group bearings, dual symmetric case drain ports (L and L1) for flexible horizontal or vertical mounting, and a standard full-torque through-drive capable of mounting secondary gear or piston pumps up to the same frame size (100% through-drive), the HYH10VO Series 31 delivers exceptional suction characteristics, low operating noise, and extensive modular control versatility (including DG direct two-point control, DR pressure regulation, DFR/DFR1/DRSC load-sensing flow governors, DFLR power limiters, ED/ER electrohydraulic pressure controls, and EC4/EB4 electro-proportional valves).
| Dimension of HENGYUHANG HYH10VO Series 31 Hydraulic Pumps
| Mechanical Installation Interface Specifications
| Frame Size (HYH10VO) | Mounting Flange Standard (ISO 3019-1 / SAE) | Drive Shaft Options (ANSI B92.1a Involute Spline) | Working Pressure Port B (ISO 6162 / SAE J518) | Suction Port S (ISO 6162 / SAE J518) | Dual Case Drain Ports L / L1 (ISO 11926 / DIN 3852) | Pilot Pressure Port X (ISO 11926 / DIN 3852) |
|---|---|---|---|---|---|---|
| HYH10VO18 | 2-Hole SAE 82-2 (A) Spigot Ø82.55 mm | S: 3/4 in 11T 16/32DP; R: 3/4 in 11T (Reinforced); U: 5/8 in 9T 16/32DP | 3/4 in (M10×1.5, 17 deep / UNC 3/8-16) | 1 in (M10×1.5, 17 deep / UNC 3/8-16) | Metric: M16×1.5 (12 deep); UNC: 9/16-18UNF-2B (13 deep) | Metric: M14×1.5 (12 deep); UNC: 7/16-20UNF-2B (11.5 deep) |
| HYH10VO28 | 2-Hole SAE 101-2 (B) Spigot Ø101.6 mm | S: 7/8 in 13T 16/32DP; R: 7/8 in 13T (Reinforced); U: 3/4 in 11T / W: 3/4 in 11T (High torque) | 3/4 in (M10×1.5, 17 deep / UNC 3/8-16) | 1 1/4 in (M10×1.5, 17 deep / UNC 7/16-14) | Metric: M18×1.5 (12 deep); UNC: 3/4-16UNF-2B (15 deep) | Metric: M14×1.5 (12 deep); UNC: 7/16-20UNF-2B (11.5 deep) |
| HYH10VO45 | 2-Hole SAE 101-2 (B) Spigot Ø101.6 mm | S: 1 in 15T 16/32DP; R: 1 in 15T (Reinforced); U: 7/8 in 13T / W: 7/8 in 13T (High torque) | 1 in (M10×1.5, 17 deep / UNC 3/8-16) | 1 1/2 in (M12×1.75, 20 deep / UNC 1/2-13) | Metric: M22×1.5 (12 deep); UNC: 7/8-14UNF-2B (17 deep) | Metric: M14×1.5 (12 deep); UNC: 7/16-20UNF-2B (11.5 deep) |
| HYH10VO71 | 2-Hole SAE 127-2 (C) Spigot Ø127.0 mm | S: 1 1/4 in 14T 12/24DP; R: 1 1/4 in 14T (Reinforced); U: 1 in 15T / W: 1 in 15T (High torque) | 1 in (M10×1.5, 17 deep / UNC 3/8-16) | 2 in (M12×1.75, 20 deep / UNC 1/2-13) | Metric: M22×1.5 (12 deep); UNC: 7/8-14UNF-2B (17 deep) | Metric: M14×1.5 (12 deep); UNC: 7/16-20UNF-2B (11.5 deep) |
| HYH10VO88 | 2-Hole SAE 127-2 (C) Spigot Ø127.0 mm | S: 1 1/4 in 14T 12/24DP; R: 1 1/4 in 14T (Reinforced); U: 1 in 15T / W: 1 in 15T (High torque) | 1 in (M10×1.5, 17 deep / UNC 3/8-16) | 2 in (M12×1.75, 20 deep / UNC 1/2-13) | Metric: M22×1.5 (12 deep); UNC: 7/8-14UNF-2B (17 deep) | Metric: M14×1.5 (12 deep); UNC: 7/16-20UNF-2B (11.5 deep) |
| HYH10VO100 | 2-Hole SAE 127-2 (C) or 2/4-Hole (D) Ø127.0 mm | S: 1 1/2 in 17T 12/24DP; U: 1 1/4 in 14T 12/24DP; W: 1 1/4 in 14T (High torque) | 1 1/4 in (M14×2, 19 deep / UNC 1/2-13; High-Pressure Series) | 2 1/2 in (M12×1.75, 17 deep / UNC 1/2-13) | Metric: M27×2 (16 deep); UNC: 1 1/16-12UNF-2B (20 deep) | Metric: M14×1.5 (12 deep); UNC: 7/16-20UNF-2B (11.5 deep) |
| Port Connection Configurations
Port Plate 11 / 61 (Sizes 18, 28, 45, 100): Rear SAE flange ports, metric / UNC fastening thread (not suitable for through drive).
Port Plate 41 / 91 (Sizes 71, 88): Rear SAE flange ports, metric / UNC fastening thread (not suitable for through drive).
Port Plate 12 / 62 (Sizes 18, 28, 45, 100): Lateral opposite SAE flange ports, metric / UNC fastening thread (standard for through drive).
Port Plate 42 / 92 (Sizes 71, 88): Lateral opposite SAE flange ports, metric / UNC fastening thread (standard for through drive).
| Pump Installation Specifications
| Complete Ordering Code Structure
HYH10V−O−[Size]−[Control]/31 [Rotation]−V[Shaft][Flange][Port Plate][Through Drive]−[Connector][Sensor]
| Position | Code Segment | Available Designations & Options | Technical Description & Functional Purpose |
|---|---|---|---|
| 01 | Unit Version | Blank / H | Blank: Standard rotating group; H: High-speed rotating group (Sizes 45, 71, 100) |
| 02 | Axial Piston Unit | HYH10V / A10V | Swashplate design, variable displacement, nominal pressure 280 bar, peak 350 bar |
| 03 | Operating Mode | O | Pump, open-circuit hydrostatic drive |
| 04 | Geometric Frame Size | 18, 28, 45, 71, 88, 100 | Rated geometric displacement in cm³/rev |
| 05 | Control Devices | DG; DR / DRG; DFR / DFR1 / DRSC; DFLR; ED71 / ED72; ER71 / ER72; EC4 / EB4 | DG: Two-point direct-operated hydraulic on/off displacement control; DR / DRG: Pressure controller (standard hydraulic or remote controlled); DFR / DFR1 / DRSC: Pressure and flow controller (load-sensing; X-T open, plugged with flushing, or without flushing); DFLR: Pressure, flow, and power controller (hyperbolic power limiter); ED71 / ED72: Electrohydraulic pressure control, negative control (12V DC / 24V DC); ER71 / ER72: Electrohydraulic pressure control, positive control (12V DC / 24V DC); EC4 / EB4: Electro-hydraulic proportional control valve (positive EC4 / negative EB4, 12V–24V DC) |
| 06 | Series / Design Index | 31 | Series 3, Index 1 |
| 07 | Direction of Rotation | R, L | Clockwise (R) or Counter-clockwise (L), viewed facing drive shaft |
| 08 | Sealing Material | V | FKM (fluorocarbon rubber) high-temperature dynamic seals |
| 09 | Drive Shaft Type | S, R, U, W | S: ANSI B92.1a spline (standard); R: Reinforced spline for high torque; U: Undersized spline; W: High-torque reduced spline |
| 10 | Mounting Flange | C, D | C: ISO 3019-1 (SAE) 2-hole flange; D: ISO 3019-1 (SAE) 2/4-hole flange (Size 100) |
| 11 | Working Line Ports | 11, 12, 41, 42, 61, 62, 91, 92 | 11/41/61/91: Rear ports (metric / UNC); 12/42/62/92: Lateral side ports (metric / UNC) |
| 12 | Through-Drive Flange | N00, K01, K52, K68, K04, K07, K24 | N00: None; K01/K52: SAE A (9T/11T); K68/K04: SAE B (13T/15T); K07/K24: SAE C (14T/17T) |
| 13 | Connector for Solenoid | Blank / P | Blank: Purely hydraulic control; P: Molded DEUTSCH 2-pin connector (DT04-2P) without suppressor diode |
| 14 | Swivel Angle Sensor | Blank / H / P | Blank: Without sensor; H: Ratiometric electric angle sensor (PAL, 5V DC); P: SENT digital protocol |
| Reading Your Replacement Code
| Rexroth OEM Model Code | HENGYUHANG Drop-In Code | Displacement | Control Mechanism | Mounting & Drive Shaft | Porting & Through Drive |
|---|---|---|---|---|---|
| A10VO18DR/31R-VSC12N00 | HYH10VO18DR/31R-VSC12N00 | 18.0 cm³/rev | Hydraulic pressure regulator (DR) | SAE 82-2 2-bolt flange, ANSI 3/4" 11T spline | Side SAE ports (M10), without through drive |
| A10VO28DFR1/31R-VSC12K01 | HYH10VO28DFR1/31R-VSC12K01 | 28.0 cm³/rev | Pressure & flow control (LS, DFR1) | SAE 101-2 2-bolt flange, ANSI 7/8" 13T spline | Side SAE ports, SAE A through drive (9T) |
| A10VO45DFR/31R-VSC12K68 | HYH10VO45DFR/31R-VSC12K68 | 45.0 cm³/rev | Pressure & flow control (LS, DFR) | SAE 101-2 2-bolt flange, ANSI 1" 15T spline | Side SAE ports, SAE B through drive (13T) |
| A10VO71DFLR/31R-VSC42K04 | HYH10VO71DFLR/31R-VSC42K04 | 71.0 cm³/rev | Pressure, flow & power control (DFLR) | SAE 127-2 2-bolt flange, ANSI 1 1/4" 14T spline | Side SAE ports (Code 42), SAE B through drive (15T) |
| A10VO88DR/31R-VSC42K07 | HYH10VO88DR/31R-VSC42K07 | 88.0 cm³/rev | Hydraulic pressure regulator (DR) | SAE 127-2 2-bolt flange, ANSI 1 1/4" 14T spline | Side SAE ports (Code 42), SAE C through drive (14T) |
| A10VO100ED72/31R-VSD12K24-P | HYH10VO100ED72/31R-VSD12K24-P | 100.0 cm³/rev | Electrohydraulic pressure (24V negative) | SAE 127-4 4-bolt flange, ANSI 1 1/2" 17T spline | Side SAE ports, SAE C through drive (17T), DEUTSCH |
Technical Specifications of HENGYUHANG HYH10VO Series 31 (Sizes 18–100)
4.1 Frame Size Performance Matrix (Data at pₐᵦₛ=1 bar at suction port S, mineral oil ρ=0.88 kg/L)
| Performance Parameter | Unit | HYH10VO18 | HYH10VO28 | HYH10VO45 | HYH10VO71 | HYH10VO88 | HYH10VO100 |
|---|---|---|---|---|---|---|---|
| Max Displacement (Vgₘₐₓ) | cm³/rev | 18.0 | 28.0 | 45.0 | 71.0 | 88.0 | 100.0 |
| Nominal Speed Standard (nₙₒₘ at Vgₘₐₓ) | rpm | 3,300 | 3,000 | 2,600 | 2,200 | 2,100 | 2,000 |
| Nominal Speed High-Speed Version (n_nom H) | rpm | — | — | 3,000 | 2,550 | — | 2,300 |
| Max Permissible Speed (n_max perm at Vg<Vgₘₐₓ) | rpm | 3,900 | 3,600 | 3,100 | 2,600 | 2,500 | 2,400 |
| Minimum Operating Speed (nₘᵢₙ) | rpm | 500 | 500 | 500 | 500 | 500 | 500 |
| Continuous Flow Rate (qV at nₙₒₘ) | L/min | 59 | 84 | 117 | 156 | 185 | 200 |
| Continuous Flow Rate High-Speed (q_V H) | L/min | — | — | 135 | 178 | — | 230 |
| Drive Power Standard (Pₘₐₓ at Δp=280 bar) | kW | 28 | 39 | 55 | 73 | 86 | 93 |
| Drive Power High-Speed (P_max H at Δp=280 bar) | kW | — | — | 63 | 83 | — | 107 |
| Drive Torque at Vgₘₐₓ (Δp=280 bar) | Nm | 80 | 125 | 200 | 316 | 392 | 445 |
| Drive Torque at Vgₘₐₓ (Δp=100 bar) | Nm | 30 | 45 | 72 | 113 | 140 | 159 |
| Shaft Stiffness Standard S (c) | kNm/rad | 11.1 | 22.3 | 37.5 | 71.9 | 71.9 | 121.1 |
| Shaft Stiffness Reinforced R (c) | kNm/rad | 14.9 | 26.4 | 41.0 | 76.5 | 76.5 | — |
| Shaft Stiffness Reduced U (c) | kNm/rad | 8.1 | 16.7 | 30.1 | 52.8 | 52.8 | 91.1 |
| Shaft Stiffness High-Torque W (c) | kNm/rad | — | 19.9 | 34.5 | 57.5 | 57.5 | 101.8 |
| Rotary Moment of Inertia (J_TW) | kg·m² | 0.00093 | 0.00170 | 0.00330 | 0.00830 | 0.00830 | 0.01670 |
| Max Permissible Angular Acceleration (α) | rad/s² | 6,800 | 5,500 | 4,000 | 2,900 | 2,600 | 2,400 |
| Housing Case Fluid Volume | L | 0.40 | 0.70 | 1.00 | 1.60 | 1.60 | 2.20 |
| Dry Weight (without through drive) | kg | 12.9 | 18.0 | 23.5 | 35.2 | 35.2 | 49.5 |
| Dry Weight (with through drive) | kg | 14.0 | 19.3 | 25.1 | 38.0 | 38.0 | 55.4 |
4.2 Operating Pressure Boundaries
| Pressure Characteristic | Value | Definition & Operational Guidelines |
|---|---|---|
| Nominal Operating Pressure (pₙₒₘ) | 280 bar (4,100 psi) | Maximum continuous design fatigue pressure according to ISO standards |
| Maximum Peak Pressure (pₘₐₓ) | 350 bar (5,100 psi) | Maximum transient peak within single operating period (t≤2.5 ms, total accumulated ≤300 h) |
| Minimum Pressure on High-Pressure Port B | ≥10 bar (145 psi) absolute | Minimum high-pressure rating required to prevent rotary group lift-off damage |
| Rate of Pressure Change (RAₘₐₓ) | 16,000 bar/s (232,000 psi/s) | Maximum permissible speed of pressure rise and reduction across operating range |
| Suction Port Pressure (pₛ at Port S) | ≥0.8 bar (12 psi) absolute | Minimum continuous suction pressure; maximum permissible p_S max=10 bar (145 psi) absolute |
| Case Drain Permissible Pressure (p_L, p_L1) | ≤2.0 bar (30 psi) absolute | Maximum 0.5 bar higher than inlet pressure at port S; case must always exceed ambient pressure |
| Pilot Pressure Line Port X | ≤350 bar (5,100 psi) | Maximum external pilot pressure rating for control circuits |
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 | Optimal balance of volumetric efficiency and mechanical longevity |
| Continuous Operating Viscosity | 10 to 400 mm²/s | Full performance across standard operating temperature envelope |
| Minimum Viscosity (νₘᵢₙ) | 7 to 10 mm²/s | Short-term limit (t≤1 min) at p≤0.3⋅pₙₒₘ, T_max=+110 ∘C measured at drain port L / L1 |
| Maximum Viscosity at Cold Start (νₘₐₓ) | 1,600 mm²/s | Permissible at cold start (p≤30 bar, n≤1,000 rpm, ϑ_St≥−25 ∘C, warm-up ≤1 min) |
| Permissible Fluid Temperature Range | −25 ∘C to +110 ∘C (−13 ∘F to +230 ∘F) | Full operating phase with standard FKM fluorocarbon dynamic seals |
| Fluid Cleanliness Class | ISO 4406 Class 20/18/15 | At elevated temperatures (+90 ∘C to +115 ∘C), maintain Class 19/17/14 |
| Alternative Fluids | HETG, HEES, HEPG, HFDU | Environmental fluids; observe specific operating viscosity boundaries |
Product Advantages
Rugged 280 Bar Continuous Rating
Higher pressure margin (280 bar nominal, 350 bar peak) provides increased hydraulic power density compared to standard 210/250 bar medium-pressure units.
Dual Case Drain Ports (L & L1)
Symmetrically positioned drain ports allow straightforward fluid return piping and prevent internal case overpressurization in both horizontal and vertical mounting orientations.
Full 100% Torque Through-Drive
Heavy-duty through-drive mechanism supports secondary pump compounding with identical frame sizes, transmitting 100% input drive torque without structural fatigue.
Optional High-Speed Rotating Group (H Version)
Available for Sizes 45, 71, and 100, boosting maximum continuous drive speeds up to 3,000 rpm for direct engine-coupled applications.
Comprehensive Modular Control Range
Easily configured with load-sensing (DFR/DFR1), remote pressure limiter (DRG), hyperbolic power limiter (DFLR), and electronic proportional controls (ED/ER/EC4).
Precision 1:1 OEM Drop-In Compatibility
Exact adherence to Bosch Rexroth A10VO Series 31 dimensions, mounting flanges, ANSI splines, and port centers guarantees direct field replacement without machine modification.
Interchangeability & Cross Reference
6.1 Direct Replacement Matrix: Bosch Rexroth A10VO Series 31 to HENGYUHANG HYH10VO Series 31
| Rexroth OEM Model | Displacement | Mounting Flange Standard | Drive Shaft Specification | Working Port Connection | Direct Replacement |
|---|---|---|---|---|---|
| A10VO18 | 18.0 cm³/rev | SAE 82-2 (A) 2-Hole Ø82.55 mm | ANSI 3/4 in 11T Spline (S / R / U) | SAE J518 3/4" Port B / 1" Port S (Code 11/12) | HYH10VO18 |
| A10VO28 | 28.0 cm³/rev | SAE 101-2 (B) 2-Hole Ø101.6 mm | ANSI 7/8 in 13T Spline (S / R / U / W) | SAE J518 3/4" Port B / 1 1/4" Port S (Code 11/12) | HYH10VO28 |
| A10VO45 | 45.0 cm³/rev | SAE 101-2 (B) 2-Hole Ø101.6 mm | ANSI 1 in 15T Spline (S / R / U / W) | SAE J518 1" Port B / 1 1/2" Port S (Code 11/12) | HYH10VO45 |
| A10VO71 | 71.0 cm³/rev | SAE 127-2 (C) 2-Hole Ø127.0 mm | ANSI 1 1/4 in 14T Spline (S / R / U / W) | SAE J518 1" Port B / 2" Port S (Code 41/42) | HYH10VO71 |
| A10VO88 | 88.0 cm³/rev | SAE 127-2 (C) 2-Hole Ø127.0 mm | ANSI 1 1/4 in 14T Spline (S / R / U / W) | SAE J518 1" Port B / 2" Port S (Code 41/42) | HYH10VO88 |
| A10VO100 | 100.0 cm³/rev | SAE 127-2 (C) 2-Hole or 127-4 (D) 4-Hole | ANSI 1 1/2 in 17T Spline (S / U / W) | SAE J518 1 1/4" Port B / 2 1/2" Port S (Code 11/12) | HYH10VO100 |
6.2 Common Control Assembly Cross Reference
| Target Rexroth Function | OEM Controller Code | Equivalent | Functional Characteristic |
|---|---|---|---|
| Two-Point Control | DG | HYH-DG | Direct-operated on/off displacement switching between Vg min and Vg max |
| Pressure Regulator | DR | HYH-DR | Maintains constant system pressure by swiveling pump to zero flow at cut-off |
| Remote Pressure Regulator | DRG | HYH-DRG | Remotely adjustable pressure limiter via external hydraulic pilot relief valve |
| Load-Sensing Flow Control | DFR / DFR1 | HYH-DFR / HYH-DFR1 | Matches pump flow to actuator demand (Δp=14…25 bar); DFR1 includes flushing |
| Power Controller | DFLR | HYH-DFLR | Hyperbolic input torque/power limitation combined with pressure & LS control |
| Electrohydraulic Pressure Control | ED71 / ED72 | HYH-ED71 / HYH-ED72 | Proportional pressure regulation, negative characteristic (12V DC / 24V DC) |
| Electrohydraulic Pressure Control | ER71 / ER72 | HYH-ER71 / HYH-ER72 | Proportional pressure regulation, positive characteristic (12V DC / 24V DC) |
| Electro-Proportional Valve | EC4 / EB4 | HYH-EC4 / HYH-EB4 | Integrated proportional pilot control valve (positive EC4 / negative EB4, 12V–24V DC) |
Brand Replacement
Bosch Rexroth: Primary 1:1 direct interchangeability for A10VO Series 31 open-circuit variable displacement pumps.
Danfoss: Series 45 open-circuit pumps; Parker Hannifin (P1/PD Series) and Eaton open-circuit pumps engineered upon request.
Applications
Construction Excavators & Trenchers: Main or auxiliary hydraulic supply for arm cylinders, swing drives, and auxiliary attachment circuits.
Concrete Mixers & Pump Trucks: Auxiliary boom placement, water washout systems, chute positioning, and transfer drives.
Mobile Cranes & Telehandlers: Outrigger leveling, boom elevation, telescoping extensions, and auxiliary hoist winches.
Agricultural Tractors & Forestry Harvesters: Central hydraulic supply for three-point hitches, remote hydraulic spools, and harvesting heads.
Material Handling Loaders & Dumpers: Steering priority feeds, mast tilting, and hydraulic brake charging circuits.
Stationary Industrial Hydraulic Power Packs: Metal balers, hydraulic presses, marine winches, and machine tool clamping units.
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 HYH10VO pump undergoes automated test-bench trials verifying volumetric efficiency (>94%), continuous and peak pressure hold at 280/350 bar, internal case leakage limits, 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 A10VO Series 31 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 Pump HYH10VO Series 31 (Variable Swashplate Open-Circuit Hydraulic Pump, 18.00~100.00 cm³/rev) is a heavy-duty, all-purpose medium-pressure variable-displacement axial piston pump designed in swashplate rotary architecture for hydrostatic open-circuit drives in mobile machinery, construction equipment, agricultural tractors, and industrial power units. Manufactured by Quanzhou Hengyuhang Power Technology Co., Ltd. as an engineered, direct-fit replacement line designed to match the benchmark performance, mounting geometry, pressure ratings, and hydraulic characteristics of the Rexroth A10VO Series 31, the HYH10VO Series 31 is built to the technical benchmark standards defined in official OEM documentation (RE 92701). Fluid delivery flow is directly proportional to drive speed and swashplate displacement angle, allowing infinitely variable, smooth flow modulation from zero to maximum output. Operating at an elevated nominal continuous pressure of 280 bar (4100 psi / 28 MPa) and a maximum peak operating pressure of 350 bar (5100 psi / 35 MPa) across 6 primary displacement sizes—18, 28, 45, 71, 88, and 100 cm³/rev (with optional high-speed H-versions for sizes 45, 71, and 100)—the HYH10VO Series 31 features dual case drain ports, favorable power-to-weight ratio, high permissible rotational speeds (up to 3300 rpm standard / 3900 rpm intermittent), low noise levels, and standard 100% full-torque rear through-drives (SAE A, SAE B, SAE C) capable of powering secondary pumps up to the same displacement size. Equipped with stable preloaded drive shaft bearings, standard SAE J744 2-bolt / 4-bolt mounting flanges, ANSI B92.1a splined shafts, and ISO 6162 split-flange ports, the HYH10VO Series 31 supports an extensive controller program including direct two-point control (DG), hydraulic pressure controllers (DR/DRG), load-sensing flow controllers (DFR/DFR1/DRSC), electrohydraulic pressure controllers (ED71/ED72, ER71/ER72), and power controllers with pressure cut-off (DFLR), offering a proven, cost-effective drop-in replacement worldwide.
| Applications
The HYH10VO Series 31 variable swashplate pump is engineered specifically for open-circuit mobile work hydraulics and medium/high-pressure industrial systems requiring robust duty cycles, compact envelope dimensions, and responsive displacement control:
Construction & Earthmoving Machinery: Primary implement and auxiliary hydraulic pump for compact excavators, mini wheel loaders, skid-steer attachments, trenchers, and backhoe loaders.
Agricultural Tractors & Self-Propelled Harvesters: Powers high-flow implement circuits, three-point hitches, hydraulic steering priority units, and boom/header positioning systems with load-sensing (DFR/DFR1) efficiency.
Mobile Cranes & Material Handling Telehandlers: Supplies hydraulic power for boom elevation, telescoping cylinders, winch hoist drives, outrigger stabilizers, and steering circuits.
On-Demand Electrohydraulic Fan Drives: Electronic proportional speed control of radiator and hydraulic cooler cooling fans on heavy off-highway trucks and gensets using ED71/ED72 negative electrohydraulic control.
Forestry & Concrete Equipment: Powers continuous-duty log splitters, tree harvesters, concrete transit mixer drum drives, and small pump-truck auxiliary arms.
Tandem Multi-Circuit Auxiliary Power Packs: Utilizes standardized rear through-drive configurations (SAE A, SAE B, SAE C) to drive secondary gear or piston pumps with 100% full-torque mechanical transfer.
| Key Specifications Overview
| Parameter | Hengyuhang HYH10VO Series 31 Specification (OEM Benchmark Standard) |
|---|---|
| Pump Classification | Axial Piston Variable Displacement Pump in Swashplate Design for Open Circuits (HYH10VO Series 31) |
| OEM Interchange Reference | Direct dimensional, functional, and hydraulic drop-in replacement for Rexroth A10VO Series 31 |
| Displacement Size Range | 6 Standard Frame Sizes: 18, 28, 45, 71, 88, and 100 cm³/rev (1.10 to 6.10 in³/rev) |
| High-Speed Version Option (Code H) | Available on Sizes 45, 71, and 100 cm³/rev with higher permissible nominal drive speeds and flow outputs |
| Nominal Continuous Pressure (pnom) | 280 bar (4100 psi / 28 MPa) continuous working pressure at service port B |
| Maximum Peak Operating Pressure (pmax) | 350 bar (5100 psi / 35 MPa) maximum peak pressure within single operating periods (single period: 2 ms; total: 300 h) |
| Minimum High-Pressure Holding (pB abs) | 10 bar (145 psi) absolute minimum pressure required on high-pressure side to prevent internal slipper liftoff |
| 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 |
| Case Drain Configuration | 2 distinct drain ports (L and L1) for flexible vertical or horizontal mounting and rapid case thermal venting |
| Rotational Speed Range (at Vg max, pabs = 1 bar) | Standard nominal speeds: 2000 rpm (Size 100) to 3300 rpm (Size 18); High-speed version: up to 3000 rpm (Size 45 H) |
| Suction Pressure Range (Port S Inlet) | Continuous pS min ≥ 0.8 bar absolute (12 psi); Maximum allowable inlet pressure pS max ≤ 5 bar absolute (75 psi) |
| Case Drain Pressure Rating (Ports L, L1) | Maximum continuous case pressure pL max ≤ 2 bar absolute (30 psi); Case pressure must always exceed ambient pressure |
| Rotary Group & Swashplate Technology | Swashplate rotary group with steel slipper shoes, hardened barrel, dual return springs, and stable preloaded bearings |
| Mounting Flange Standards | ISO 3019-1 (SAE J744) 2-bolt (Code C: SAE A, SAE B, SAE C); Code D: SAE C 2/4-bolt combination flange (Size 100) |
| Drive Shaft Configurations | ANSI B92.1a splined shafts: Code S (standard), Code R (reinforced torque), Code U (reduced diameter), Code W (high torque) |
| Working Fluid Ports (Port B Outlet) | ISO 6162-1 (Code 61) split-flange on sizes 18~88 (350 bar rated); ISO 6162-2 (Code 62) high-pressure flange on size 100 |
| Suction Fluid Ports (Port S Inlet) | ISO 6162-1 (Code 61) split-flange: 1 in (size 18), 1 1/4 in (size 28), 1 1/2 in (size 45), 2 in (sizes 71 & 88), 2 1/2 in (size 100) |
| Case Drain Fluid Ports (Ports L, L1) | Metric DIN 3852 (M16~M27) or SAE ISO 11926 (3/4-16 UNF to 1 1/16-12 UN) threaded ports depending on port plate code |
| Sealing Material System | Code V: Premium FKM (fluorocarbon rubber) seals standard (-25°C to +110°C continuous, +115°C short-term) |
| 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 rear through-drive shaft (Codes K01, K52, K68, K04, K07, K24) for mounting secondary gear or piston pumps |
| Technical Performance Matrix Across Available Sizes
| Model Number (Hengyuhang Series) | Geometric Displacement Vg max (cm³/rev / in³) | Drive Speed (rpm) | Delivery Flow @ n_nom (L/min / gpm) | Drive Power @ 280 bar (kW / HP) | Torque Output @ 280 bar (Nm / lb-ft) | Rotary Stiffness c (Nm/rad) | Angular Accel. α (rad/s²) | Case Fill (L / gal) | Unit Mass m (kg / lbs) | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Nominal n_nom | Maximum n_max | Shaft S | Shaft R | w/o Thru-Drive | with Thru-Drive | |||||||
| ■ Standard Version Series (18 to 100 cm³/rev, 280 bar Nominal / 350 bar Peak) | ||||||||||||
| HYH10VO-18 | 18.00 (1.10) | 3300 | 3900 | 59.0 (15.6) | 28.0 (38.0) | 80.0 (59.0) | 11,087 | 14,850 | 6800 | 0.40 (0.106) | 12.9 (28.0) | 14.0 (31.0) |
| HYH10VO-28 | 28.00 (1.71) | 3000 | 3600 | 84.0 (22.0) | 39.0 (52.0) | 125.0 (92.0) | 22,317 | 26,360 | 5500 | 0.70 (0.185) | 18.0 (40.0) | 19.3 (43.0) |
| HYH10VO-45 | 45.00 (2.75) | 2600 | 3100 | 117.0 (30.9) | 55.0 (74.0) | 200.0 (148.0) | 37,500 | 41,025 | 4000 | 1.00 (0.264) | 23.5 (52.0) | 25.1 (55.0) |
| HYH10VO-71 | 71.00 (4.33) | 2200 | 2600 | 156.0 (41.2) | 73.0 (98.0) | 316.0 (233.0) | 71,884 | 76,545 | 2900 | 1.60 (0.420) | 35.2 (78.0) | 38.0 (84.0) |
| HYH10VO-88 | 88.00 (5.37) | 2100 | 2500 | 185.0 (48.9) | 86.0 (115.0) | 392.0 (289.0) | 71,884 | 76,545 | 2600 | 1.60 (0.420) | 35.2 (78.0) | 38.0 (84.0) |
| HYH10VO-100 | 100.00 (6.10) | 2000 | 2400 | 200.0 (52.8) | 93.0 (125.0) | 445.0 (328.0) | 121,142 | – | 2400 | 2.20 (0.580) | 49.5 (109.0) | 55.4 (122.0) |
| ■ High-Speed Version Series (Code H, Increased Rotation Speed & Output Flow) | ||||||||||||
| HYH10VO-45 / H | 45.00 (2.75) | 3000 | 3300 | 135.0 (35.7) | 63.0 (84.0) | 200.0 (148.0) | 37,500 | 41,025 | 4000 | 1.00 (0.264) | 23.5 (52.0) | 25.1 (55.0) |
| HYH10VO-71 / H | 71.00 (4.33) | 2550 | 2800 | 178.0 (47.0) | 83.0 (111.0) | 316.0 (233.0) | 71,884 | 76,545 | 2900 | 1.60 (0.420) | 35.2 (78.0) | 38.0 (84.0) |
| HYH10VO-100 / H | 100.00 (6.10) | 2300 | 2500 | 230.0 (60.8) | 107.0 (143.0) | 445.0 (328.0) | 121,142 | – | 2400 | 2.20 (0.580) | 49.5 (109.0) | 55.4 (122.0) |
| Control Devices & Operating Mechanisms
| Control Code | Control Classification | Control Signal & Pilot Supply | Functional Operation & Machine Application |
|---|---|---|---|
| DG | Two-Point Control, Direct Operated | Hydraulic external switching pressure at port X (G 1/4 in) | Simple direct switching between minimum displacement (Vg min) and maximum displacement (Vg max) via an external hydraulic pilot pressure signal. |
| DR | Hydraulic Pressure Controller | Internal pressure sensing up to 280/350 bar | Maintains constant hydraulic system pressure by swiveling pump displacement back towards zero when set pressure is reached; protects system against overload. |
| DRG | Remotely Controlled Pressure Controller | External pilot pressure relief valve connected via port X | Enables multi-pressure stage control or remote proportional pressure adjustment via an external remote relief valve connected to pilot port X. |
| DFR | Pressure and Flow Controller (Load-Sensing, X-T Open) | Load pressure signal connected at port X with open drain orifice | True load-sensing control that adjusts pump flow to match actuator demand while maintaining preset differential pressure (Δp = 14~22 bar); minimizes energy losses. |
| DFR1 / DRSC | Pressure and Flow Controller (Load-Sensing, X-T Plugged) | Port X plugged with internal flushing function (DFR1) or without flushing (DRSC) | Load-sensing regulation designed for systems where the load signal line drain orifice is integrated externally inside the main directional control valve block. |
| DFLR | Pressure, Flow and Power Controller | Combined hydraulic load-sensing signal and hyperbolic power-limiter spring | Overrides pressure and flow controls to limit drive engine torque and power absorption to a preset hyperbolic curve, preventing diesel engine stall. |
| ED71 / ED72 | Electrohydraulic Pressure Controller (Negative Characteristic) | Electric current signal (ED71: 12V DC / ED72: 24V DC, DEUTSCH DT04-2P) | Electrical proportional pressure setting; maximum pressure achieved at zero current (fail-safe high pressure), pressure decreases proportionally as solenoid current increases (ideal for fan drives). |
| ER71 / ER72 | Electrohydraulic Pressure Controller (Positive Characteristic) | Electric current signal (ER71: 12V DC / ER72: 24V DC, DEUTSCH DT04-2P) | Electrical proportional pressure setting with positive characteristic; minimum pressure at zero current, pressure rises proportionally with increasing control current. |
| EC4 / EB4 | Electro-Hydraulic Control Valve with Swivel Angle Sensor | Electric current 12V to 24V DC with integrated Hall swivel angle sensor PAL | Direct closed-loop electrohydraulic proportional displacement positioning with real-time electronic angle feedback. |
| Mounting Flange, Shaft and Port Specifications Across Sizes
| Size Model | Mounting Flange Standards | Drive Shaft Options (ANSI B92.1a / ISO) | Fluid Port Connections (Working, Suction, Drain & Pilot) |
|---|---|---|---|
| HYH10VO-18 | Code C: ISO 3019-1 (SAE J744 82-2 / SAE A 2-bolt): Pilot Ø82.55 mm (-0.054 mm); Bolt pitch 106.4 mm; 2 × Ø11.0 mm holes | Code S: Splined 3/4 in 11T 16/32DP (ext. 38.0 mm); Code R: Splined 3/4 in 11T 16/32DP (reinforced); Code U: Splined 5/8 in 9T | Port B Working: ISO 6162-1 (Code 61) 3/4 in (350 bar, M10×1.5 or 3/8-16 UNC); Port S Suction: ISO 6162-1 1 in (10 bar, M10×1.5 or 3/8-16 UNC); Drain L/L1: DIN 3852 M16×1.5 (or 9/16-18 UNF); Pilot X: M14×1.5 (or G 1/4 in) |
| HYH10VO-28 | Code C: ISO 3019-1 (SAE J744 101-2 / SAE B 2-bolt): Pilot Ø101.6 mm (-0.054 mm); Bolt pitch 146.0 mm; 2 × Ø14.3 mm holes | Code S: Splined 7/8 in 13T 16/32DP (ext. 41.0 mm); Code R: Splined 7/8 in 13T (reinforced); Code U: Splined 3/4 in 11T; Code W: Splined | Port B Working: ISO 6162-1 (Code 61) 3/4 in (350 bar, M10×1.5 or 3/8-16 UNC); Port S Suction: ISO 6162-1 1 1/4 in (10 bar, M10×1.5 or 7/16-14 UNC); Drain L/L1: M18×1.5 (or 3/4-16 UNF); Pilot X: M14×1.5 (or G 1/4 in) |
| HYH10VO-45 | Code C: ISO 3019-1 (SAE J744 101-2 / SAE B 2-bolt): Pilot Ø101.6 mm (-0.054 mm); Bolt pitch 146.0 mm; 2 × Ø14.3 mm holes | Code S: Splined 1 in 15T 16/32DP (ext. 45.9 mm); Code R: Splined 1 in 15T (reinforced); Code U: Splined 7/8 in 13T; Code W: Splined | Port B Working: ISO 6162-1 (Code 61) 1 in (350 bar, M10×1.5 or 3/8-16 UNC); Port S Suction: ISO 6162-1 1 1/2 in (10 bar, M12×1.75 or 1/2-13 UNC); Drain L/L1: M22×1.5 (or 7/8-14 UNF); Pilot X: M14×1.5 (or G 1/4 in) |
| HYH10VO-71 & 88 | Code C: ISO 3019-1 (SAE J744 127-2 / SAE C 2-bolt): Pilot Ø127.0 mm (-0.054 mm); Bolt pitch 181.0 mm; 2 × Ø17.5 mm holes | Code S: Splined 1 1/4 in 14T 12/24DP (ext. 55.5 mm); Code R: Splined 1 1/4 in 14T (reinforced); Code U: Splined 1 in 15T; Code W: Splined | Port B Working: ISO 6162-1 (Code 61) 1 in (350 bar, M10×1.5 or 3/8-16 UNC); Port S Suction: ISO 6162-1 2 in (10 bar, M12×1.75 or 1/2-13 UNC); Drain L/L1: M22×1.5 (or 7/8-14 UNF); Pilot X: M14×1.5 (or G 1/4 in) |
| HYH10VO-100 | Code C: ISO 3019-1 (SAE C 2-bolt: Pilot Ø127.0 mm, pitch 181 mm); or Code D: ISO 3019-1 (SAE C 2/4-bolt combo: Pilot Ø127.0 mm, 4 × Ø14.3 mm holes on Ø161.9 mm pitch circle) | Code S: Splined 1 1/2 in 17T 12/24DP (ext. 67.0 mm); Code U: Splined 1 1/4 in 14T 12/24DP; Code W: Splined 1 1/2 in 17T | Port B Working: ISO 6162-2 (Code 62 High Pressure) 1 1/4 in (350 bar, M14×2 or 1/2-13 UNC); Port S Suction: ISO 6162-1 2 1/2 in (10 bar, M12×1.75 or 1/2-13 UNC); Drain L/L1: M27×2 (or 1 1/16-12 UN); Pilot X: M14×1.5 (or G 1/4 in) |
| Through-Drive Options and Multi-Pump Combinations
| Through-Drive Code | Mounting Flange Standard | Internal Splined Coupling Hub | Typical 2nd Auxiliary Pump Combination |
|---|---|---|---|
| N00 | Without through drive | None (closed rear housing end) | Single pump standalone open-circuit operation |
| K01 | ISO 3019-1 82-2 (SAE A 2-bolt) | Spline ANSI B92.1a 5/8 in 9T 16/32DP | Auxiliary micro gear pumps (HYH-HGP-1A, AZPF) for steering or pilot control (Sizes 18~100) |
| K52 | ISO 3019-1 82-2 (SAE A 2-bolt) | Spline ANSI B92.1a 3/4 in 11T 16/32DP | Medium gear pumps, secondary open-circuit piston pumps (HYH10VO-18, HYH10VO-28) |
| K68 | ISO 3019-1 101-2 (SAE B 2-bolt) | Spline ANSI B92.1a 7/8 in 13T 16/32DP | Secondary HYH10VO-28/45, HYH10VSO-28/45, cast iron gear pumps (HYH-CB-FC) (Sizes 28~100) |
| K04 | ISO 3019-1 101-2 (SAE B 2-bolt) | Spline ANSI B92.1a 1 in 15T 16/32DP | Secondary HYH10VO-45/71, heavy-duty mobile gear pumps (Sizes 45~100) |
| K07 | ISO 3019-1 127-2 (SAE C 2-bolt) | Spline ANSI B92.1a 1 1/4 in 14T 12/24DP | Secondary piston pumps up to same frame size (Sizes 71, 88, 100) |
| K24 | ISO 3019-1 127-2 (SAE C 2-bolt) | Spline ANSI B92.1a 1 1/2 in 17T 12/24DP | Heavy secondary piston pumps up to same frame size (Size 100 only) |
| Direct Interchangeability and OEM Replacement Matrix (Rexroth A10VO Series 31)
| Hengyuhang Series Model | OEM Original Rexroth Reference Model | Flange & Shaft Standard | Interchangeability Verification Status |
|---|---|---|---|
| HYH10VO-18 | A10VO 18 DR / 31R-VSC12N00 (or DFR1 / 31R-VSC12N00) | SAE A 2-Bolt, 3/4 in 11T Spline | 100% Direct Physical & Functional Drop-in Replacement |
| HYH10VO-28 | A10VO 28 DFR1 / 31R-VSC12N00 (or DR / 31R-VSC12N00) | SAE B 2-Bolt, 7/8 in 13T Spline | 100% Direct Physical & Functional Drop-in Replacement |
| HYH10VO-45 | A10VO 45 DFR1 / 31R-VSC12N00 (or DFLR / 31R-VSC12N00) | SAE B 2-Bolt, 1 in 15T Spline | 100% Direct Physical & Functional Drop-in Replacement |
| HYH10VO-45 / H | A10VOH 45 DFR1 / 31R-VSC12N00 (High-Speed Version) | SAE B 2-Bolt, 1 in 15T Spline | 100% Direct Physical & Functional Drop-in Replacement |
| HYH10VO-71 | A10VO 71 DFR1 / 31R-VSC42N00 (or DFLR / 31R-VSC42N00) | SAE C 2-Bolt, 1 1/4 in 14T Spline | 100% Direct Physical & Functional Drop-in Replacement |
| HYH10VO-71 / H | A10VOH 71 DFR1 / 31R-VSC42N00 (High-Speed Version) | SAE C 2-Bolt, 1 1/4 in 14T Spline | 100% Direct Physical & Functional Drop-in Replacement |
| HYH10VO-88 | A10VO 88 DFR1 / 31R-VSC42N00 (or DFLR / 31R-VSC42N00) | SAE C 2-Bolt, 1 1/4 in 14T Spline | 100% Direct Physical & Functional Drop-in Replacement |
| HYH10VO-100 | A10VO 100 DFR1 / 31R-VSC12N00 (or DFLR / 31R-VSD12N00) | SAE C 2-Bolt / 4-Bolt, 1 1/2 in 17T Spline | 100% Direct Physical & Functional Drop-in Replacement |
| HYH10VO-100 / H | A10VOH 100 DFR1 / 31R-VSD12N00 (High-Speed Version) | SAE C 2/4-Bolt, 1 1/2 in 17T Spline | 100% Direct Physical & Functional Drop-in Replacement |
| Model Coding & Ordering Structure
| Code Field | Field Designation | Available Standard Codes | Technical Definition & Configuration Meaning |
|---|---|---|---|
| [01] Version | Speed Version Type | Without code / H | Without code: Standard speed version; Code H: High-speed version (Sizes 45, 71, 100) |
| [02] Unit Type | Axial Piston Variable Pump | HYH10V | Swashplate variable displacement machine, nominal pressure 280 bar (4100 psi), max 350 bar (5100 psi) |
| [03] Mode | Circuit Operation Mode | O | Open-circuit hydrostatic drive pump |
| [04] Frame Size | Geometric Displacement (cm³) | 18 / 28 / 45 / 71 / 88 / 100 | Nominal displacement size Vg max in cm³/rev (18, 28, 45, 71, 88, 100) |
| [05] Control Device | Displacement Control Mechanism | DG / DR / DRG / DFR / DFR1 / DRSC / DFLR / ED71 / ED72 / ER71 / ER72 / EC4 / EB4 | DG: Two-point; DR: Pressure; DFR/DFR1: Load-sensing; DFLR: Pressure/flow/power; ED/ER: Electrohydraulic fan; EC4/EB4: Proportional |
| [06] Series | Series Designation | 31 | Series 3, Index 1 |
| [07] Rotation | Direction of Rotation | R / L | Code R: Clockwise; Code L: Counter-Clockwise, viewed facing drive shaft |
| [08] Seals | Sealing Material System | V | Code V: Premium FKM (fluorocarbon rubber) seals standard (-25°C to +110°C continuous) |
| [09] Drive Shaft | Input Shaft Configuration | S / R / U / W / P | Code S: ANSI B92.1a standard spline; Code R: Reinforced spline; Code U: Reduced diameter; Code W: High torque; Code P: Keyed |
| [10] Mounting Flange | Mounting Flange Style | C / D | Code C: ISO 3019-1 2-bolt (SAE A, SAE B, SAE C); Code D: ISO 3019-1 2/4-bolt combination (SAE C on size 100) |
| [11] Working Ports | Service Port Configuration | 11 / 12 / 41 / 42 / 61 / 62 / 91 / 92 | Codes 11/12/41/42: SAE flange with metric threads; Codes 61/62/91/92: SAE flange with UNC threads; Code 62 HP flange on size 100 |
| [12] Through Drive | Rear Auxiliary Attachment | N00 / K01 / K52 / K68 / K04 / K07 / K24 | Code N00: Without through drive; Codes K01~K24: Standard SAE A, SAE B, SAE C auxiliary flanges and splined hubs (100% torque) |
| [13] Connectors | Electrical Valve Connectors | Without code / P | Without code: Hydraulic controls; Code P: DEUTSCH 2-pin molded connector DT04-2P without diode (for electric controls) |
| Technical Performance Matrix Across Available Sizes
| Model Number (Hengyuhang Series) | Geometric Displacement Vg max (cm³/rev / in³) | Drive Speed (rpm) | Delivery Flow @ n_nom (L/min / gpm) | Drive Power @ 280 bar (kW / HP) | Torque Output @ 280 bar (Nm / lb-ft) | Rotary Stiffness c (Nm/rad) | Angular Accel. α (rad/s²) | Case Fill (L / gal) | Unit Mass m (kg / lbs) | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Nominal n_nom | Maximum n_max | Shaft S | Shaft R | w/o Thru-Drive | with Thru-Drive | |||||||
| ■ Standard Version Series (18 to 100 cm³/rev, 280 bar Nominal / 350 bar Peak) | ||||||||||||
| HYH10VO-18 | 18.00 (1.10) | 3300 | 3900 | 59.0 (15.6) | 28.0 (38.0) | 80.0 (59.0) | 11,087 | 14,850 | 6800 | 0.40 (0.106) | 12.9 (28.0) | 14.0 (31.0) |
| HYH10VO-28 | 28.00 (1.71) | 3000 | 3600 | 84.0 (22.0) | 39.0 (52.0) | 125.0 (92.0) | 22,317 | 26,360 | 5500 | 0.70 (0.185) | 18.0 (40.0) | 19.3 (43.0) |
| HYH10VO-45 | 45.00 (2.75) | 2600 | 3100 | 117.0 (30.9) | 55.0 (74.0) | 200.0 (148.0) | 37,500 | 41,025 | 4000 | 1.00 (0.264) | 23.5 (52.0) | 25.1 (55.0) |
| HYH10VO-71 | 71.00 (4.33) | 2200 | 2600 | 156.0 (41.2) | 73.0 (98.0) | 316.0 (233.0) | 71,884 | 76,545 | 2900 | 1.60 (0.420) | 35.2 (78.0) | 38.0 (84.0) |
| HYH10VO-88 | 88.00 (5.37) | 2100 | 2500 | 185.0 (48.9) | 86.0 (115.0) | 392.0 (289.0) | 71,884 | 76,545 | 2600 | 1.60 (0.420) | 35.2 (78.0) | 38.0 (84.0) |
| HYH10VO-100 | 100.00 (6.10) | 2000 | 2400 | 200.0 (52.8) | 93.0 (125.0) | 445.0 (328.0) | 121,142 | – | 2400 | 2.20 (0.580) | 49.5 (109.0) | 55.4 (122.0) |
| ■ High-Speed Version Series (Code H, Increased Rotation Speed & Output Flow) | ||||||||||||
| HYH10VO-45 / H | 45.00 (2.75) | 3000 | 3300 | 135.0 (35.7) | 63.0 (84.0) | 200.0 (148.0) | 37,500 | 41,025 | 4000 | 1.00 (0.264) | 23.5 (52.0) | 25.1 (55.0) |
| HYH10VO-71 / H | 71.00 (4.33) | 2550 | 2800 | 178.0 (47.0) | 83.0 (111.0) | 316.0 (233.0) | 71,884 | 76,545 | 2900 | 1.60 (0.420) | 35.2 (78.0) | 38.0 (84.0) |
| HYH10VO-100 / H | 100.00 (6.10) | 2300 | 2500 | 230.0 (60.8) | 107.0 (143.0) | 445.0 (328.0) | 121,142 | – | 2400 | 2.20 (0.580) | 49.5 (109.0) | 55.4 (122.0) |
| Hengyuhang Series Model | OEM Original Rexroth Reference Model | Flange & Shaft Standard | Interchangeability Verification Status |
|---|---|---|---|
| HYH10VO-18 | A10VO 18 DR / 31R-VSC12N00 (or DFR1 / 31R-VSC12N00) | SAE A 2-Bolt, 3/4 in 11T Spline | 100% Direct Physical & Functional Drop-in Replacement |
| HYH10VO-28 | A10VO 28 DFR1 / 31R-VSC12N00 (or DR / 31R-VSC12N00) | SAE B 2-Bolt, 7/8 in 13T Spline | 100% Direct Physical & Functional Drop-in Replacement |
| HYH10VO-45 | A10VO 45 DFR1 / 31R-VSC12N00 (or DFLR / 31R-VSC12N00) | SAE B 2-Bolt, 1 in 15T Spline | 100% Direct Physical & Functional Drop-in Replacement |
| HYH10VO-45 / H | A10VOH 45 DFR1 / 31R-VSC12N00 (High-Speed Version) | SAE B 2-Bolt, 1 in 15T Spline | 100% Direct Physical & Functional Drop-in Replacement |
| HYH10VO-71 | A10VO 71 DFR1 / 31R-VSC42N00 (or DFLR / 31R-VSC42N00) | SAE C 2-Bolt, 1 1/4 in 14T Spline | 100% Direct Physical & Functional Drop-in Replacement |
| HYH10VO-71 / H | A10VOH 71 DFR1 / 31R-VSC42N00 (High-Speed Version) | SAE C 2-Bolt, 1 1/4 in 14T Spline | 100% Direct Physical & Functional Drop-in Replacement |
| HYH10VO-88 | A10VO 88 DFR1 / 31R-VSC42N00 (or DFLR / 31R-VSC42N00) | SAE C 2-Bolt, 1 1/4 in 14T Spline | 100% Direct Physical & Functional Drop-in Replacement |
| HYH10VO-100 | A10VO 100 DFR1 / 31R-VSC12N00 (or DFLR / 31R-VSD12N00) | SAE C 2-Bolt / 4-Bolt, 1 1/2 in 17T Spline | 100% Direct Physical & Functional Drop-in Replacement |
| HYH10VO-100 / H | A10VOH 100 DFR1 / 31R-VSD12N00 (High-Speed Version) | SAE C 2/4-Bolt, 1 1/2 in 17T Spline | 100% Direct Physical & Functional Drop-in Replacement |
| Code Field | Field Designation | Available Standard Codes | Technical Definition & Configuration Meaning |
|---|---|---|---|
| [01] Version | Speed Version Type | Without code / H | Without code: Standard speed version; Code H: High-speed version (Sizes 45, 71, 100) |
| [02] Unit Type | Axial Piston Variable Pump | HYH10V | Swashplate variable displacement machine, nominal pressure 280 bar (4100 psi), max 350 bar (5100 psi) |
| [03] Mode | Circuit Operation Mode | O | Open-circuit hydrostatic drive pump |
| [04] Frame Size | Geometric Displacement (cm³) | 18 / 28 / 45 / 71 / 88 / 100 | Nominal displacement size Vg max in cm³/rev (18, 28, 45, 71, 88, 100) |
| [05] Control Device | Displacement Control Mechanism | DG / DR / DRG / DFR / DFR1 / DRSC / DFLR / ED71 / ED72 / ER71 / ER72 / EC4 / EB4 | DG: Two-point; DR: Pressure; DFR/DFR1: Load-sensing; DFLR: Pressure/flow/power; ED/ER: Electrohydraulic fan; EC4/EB4: Proportional |
| [06] Series | Series Designation | 31 | Series 3, Index 1 |
| [07] Rotation | Direction of Rotation | R / L | Code R: Clockwise; Code L: Counter-Clockwise, viewed facing drive shaft |
| [08] Seals | Sealing Material System | V | Code V: Premium FKM (fluorocarbon rubber) seals standard (-25°C to +110°C continuous) |
| [09] Drive Shaft | Input Shaft Configuration | S / R / U / W / P | Code S: ANSI B92.1a standard spline; Code R: Reinforced spline; Code U: Reduced diameter; Code W: High torque; Code P: Keyed |
| [10] Mounting Flange | Mounting Flange Style | C / D | Code C: ISO 3019-1 2-bolt (SAE A, SAE B, SAE C); Code D: ISO 3019-1 2/4-bolt combination (SAE C on size 100) |
| [11] Working Ports | Service Port Configuration | 11 / 12 / 41 / 42 / 61 / 62 / 91 / 92 | Codes 11/12/41/42: SAE flange with metric threads; Codes 61/62/91/92: SAE flange with UNC threads; Code 62 HP flange on size 100 |
| [12] Through Drive | Rear Auxiliary Attachment | N00 / K01 / K52 / K68 / K04 / K07 / K24 | Code N00: Without through drive; Codes K01~K24: Standard SAE A, SAE B, SAE C auxiliary flanges and splined hubs (100% torque) |
| [13] Connectors | Electrical Valve Connectors | Without code / P | Without code: Hydraulic controls; Code P: DEUTSCH 2-pin molded connector DT04-2P without diode (for electric controls) |
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