Piston pump
HENGYUHANG Axial Piston Variable Pump HYH4VSO Series 1x and 30
Engineered with an ultra-heavy-duty swashplate axial piston rotary group for open-circuit hydrostatic drives, the HENGYUHANG HYH4VSO Series 1x and 30 variable pump delivers steplessly adjustable flow with hydrostatically balanced cradle bearings, integrated pre-compression volume (PCV) pulsation damping, and a continuous nominal operating pressure of 350 bar (380 bar with port plate 36) and maximum peak pressure of 400 bar (420 bar) (up to 6,090 psi / 42 MPa).
| Applications
Optimized for high-demand heavy industrial machinery and centralized hydraulic power stations, this variable axial piston pump powers heavy metal extrusion and forging presses, plastic injection molding machinery, steel rolling mills, marine winches, shipyard gantry cranes, offshore oil and gas drilling equipment, and mining excavators. Featuring standardized ISO 3019-2 4-bolt and 8-bolt metric mounting flanges, universal through-drive auxiliary pump capability, and comprehensive modular control systems (DR, DP, FR, DFR, LR, MA, EM, HM, HS5, EO, HD, EZ, DS3, DFE1, SYDFE), it provides seamless 1:1 OEM drop-in interchangeability for Bosch Rexroth A4VSO Series 1x and 30 pump installations.
| Key Technical Specifications
Product Model: Hengyuhang Axial Piston Variable Pump HYH4VSO Series 1x and 30
Brand Replacement: Bosch Rexroth A4VSO Series 1x and 30 (Sizes 40, 71, 125, 180, 250, 260, 355, 370, 500, 750, 1000; open circuit) OEM or as requested.
Displacement: 40 to 1000 cm³/rev across 11 standardized frame sizes (HYH4VSO 40, 71, 125, 180, 250, 260, 355, 370, 500, 750, 1000)
Rotation Direction: Clockwise (R), counter-clockwise (L) (viewed from drive shaft end)
Speed Range: Nominal rated speed 1,000 to 2,600 r/min (High-speed version up to 1,500 to 3,000 r/min; maximum intermittent speed up to 1,200 to 3,200 r/min)
Peak Pressure: Nominal continuous working pressure 350 bar (up to 380 bar with port plate 36); Maximum peak pressure 400 bar (up to 420 bar / 6,090 psi / 42 MPa)
- Description
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| Overview of HENGYUHANG HYH4VSO Series 1x and 30
The HENGYUHANG HYH4VSO Series 1x and 30 represents a premier class of high-pressure axial piston variable displacement pumps engineered specifically for open-circuit hydrostatic drive systems in demanding industrial environments. Available across eleven standardized displacement sizes—HYH4VSO 40, HYH4VSO 71, HYH4VSO 125, HYH4VSO 180, HYH4VSO 250, HYH4VSO 260, HYH4VSO 355, HYH4VSO 370, HYH4VSO 500, HYH4VSO 750, and HYH4VSO 1000 cm³/rev—flow delivery is directly proportional to drive speed and pump displacement, steplessly regulated by adjusting the swashplate cradle angle. Built with heavy-duty ductile iron housings, hydrostatically unloaded cradle bearings, and precision-lapped bimetallic cylinder block and piston assemblies, the HYH4VSO Series delivers exceptional power density, rapid dynamic response, and extended service life even under continuous 350/400 bar heavy-duty industrial cycles.
To address demanding acoustic requirements in manufacturing plants, the series integrates an advanced pre-compression volume (PCV) pulsation damping chamber into port plate version 36, dampening hydraulic line pressure ripple by up to 50% and dramatically attenuating airborne noise emissions. Standardized with ISO 3019-2 metric 4-bolt mounting flanges (Code B for sizes 40 to 500) and 8-bolt flanges (Code H for sizes 750 and 1000), SAE J518 metric-threaded working and suction ports, and heavy-duty cylindrical keyed (Code P) or DIN 5480 involute splined (Code Z) drive shafts, the HYH4VSO Series 1x and 30 delivers complete 1:1 mechanical, hydraulic, and dimensional drop-in interchangeability for Bosch Rexroth A4VSO Series 1x (sizes 40, 71) and Series 30 (sizes 125 to 1000) pumps without baseplate redesign or piping modifications.
| Dimension of HENGYUHANG HYH4VSO Series 1x and 30
| Interface Data Needed with the Drawing Across the 11 Models
| Model / Size (HYH4VSO) | Series | Mounting Flange (ISO 3019-2) | Drive Shaft Options | Working Port B (SAE J518 High-Pressure, 400 bar) | Suction Port S (SAE J518 Standard Series, 30 bar) | Drain Ports K1, K2 / T / R(L) (6 bar abs) | Flushing Port U (DIN 3852, 6 bar abs) | Gauge Ports MB, MS |
|---|---|---|---|---|---|---|---|---|
| HYH4VSO 40 | 10 (11) | 4-bolt flange (pilot Ø 125 mm, 4-Ø18 mm holes) | 1. Keyed P: DIN 6885; 2. Splined Z: DIN 5480 | SAE 3/4 in, 4-M10 × 1.5 depth 17 mm | SAE 1-1/2 in, 4-M12 × 1.75 depth 20 mm | ISO 6149 M22 × 1.5 depth 14 mm | DIN 3852 M14 × 1.5 depth 12 mm | MB: M14 × 1.5 (400 bar); MS: M14 × 1.5 (30 bar) |
| HYH4VSO 71 | 10 (11) | 4-bolt flange (pilot Ø 160 mm, 4-Ø18 mm holes) | 1. Keyed P: DIN 6885; 2. Splined Z: DIN 5480 | SAE 1 in, 4-M12 × 1.75 depth 20 mm | SAE 2 in, 4-M12 × 1.75 depth 20 mm | ISO 6149 M27 × 2 depth 16 mm | DIN 3852 M14 × 1.5 depth 12 mm | MB: M14 × 1.5 (400 bar); MS: M14 × 1.5 (30 bar) |
| HYH4VSO 125 | 30 | 4-bolt flange (pilot Ø 180 mm, 4-Ø22 mm holes) | 1. Keyed P: DIN 6885; 2. Splined Z: DIN 5480 | SAE 1-1/4 in, 4-M14 × 2.0 depth 19 mm | SAE 2-1/2 in, 4-M12 × 1.75 depth 18 mm | ISO 6149 M33 × 2 depth 18 mm | DIN 3852 M14 × 1.5 depth 12 mm | MB: M14 × 1.5 (400 bar); MS: M14 × 1.5 (30 bar) |
| HYH4VSO 180 | 30 | 4-bolt flange (pilot Ø 200 mm, 4-Ø22 mm holes) | 1. Keyed P: DIN 6885; 2. Splined Z: DIN 5480 | SAE 1-1/4 in, 4-M14 × 2.0 depth 19 mm | SAE 3 in, 4-M16 × 2.0 depth 24 mm | ISO 6149 M33 × 2 depth 18 mm | DIN 3852 M14 × 1.5 depth 12 mm | MB: M14 × 1.5 (400 bar); MS: M14 × 1.5 (30 bar) |
| HYH4VSO 250 | 30 | 4-bolt flange (pilot Ø 224 mm, 4-Ø22 mm holes) | 1. Keyed P: DIN 6885; 2. Splined Z: DIN 5480 | SAE 1-1/2 in, 4-M16 × 2.0 depth 25 mm | SAE 3 in, 4-M16 × 2.0 depth 24 mm | ISO 6149 M42 × 2 depth 20 mm | DIN 3852 M18 × 1.5 depth 12 mm | MB: M14 × 1.5 (400 bar); MS: M14 × 1.5 (30 bar) |
| HYH4VSO 260 | 30 | 4-bolt flange (pilot Ø 224 mm, 4-Ø22 mm holes) | 1. Keyed P: DIN 6885; 2. Splined Z: DIN 5480 | SAE 1-1/2 in, 4-M16 × 2.0 depth 25 mm (420 bar) | SAE 3 in, 4-M16 × 2.0 depth 24 mm | ISO 6149 M42 × 2 depth 20 mm | DIN 3852 M18 × 1.5 depth 12 mm | MB: M14 × 1.5 (420 bar); MS: M14 × 1.5 (30 bar) |
| HYH4VSO 355 | 30 | 4-bolt flange (pilot Ø 280 mm, 4-Ø30 mm holes) | 1. Keyed P: DIN 6885; 2. Splined Z: DIN 5480 | SAE 1-1/2 in, 4-M16 × 2.0 depth 25 mm | SAE 4 in, 4-M16 × 2.0 depth 24 mm | DIN 3852 M42 × 2 depth 20 mm | DIN 3852 M18 × 1.5 depth 12 mm | MB: M14 × 1.5 (400 bar); MS: M14 × 1.5 (30 bar) |
| HYH4VSO 370 | 30 | 4-bolt flange (pilot Ø 280 mm, 4-Ø30 mm holes) | 1. Keyed P: DIN 6885; 2. Splined Z: DIN 5480 | SAE 1-1/2 in, 4-M16 × 2.0 depth 25 mm (420 bar) | SAE 4 in, 4-M16 × 2.0 depth 24 mm | DIN 3852 M42 × 2 depth 20 mm | DIN 3852 M18 × 1.5 depth 12 mm | MB: M14 × 1.5 (420 bar); MS: M14 × 1.5 (30 bar) |
| HYH4VSO 500 | 30 | 4-bolt flange (pilot Ø 315 mm, 4-Ø30 mm holes) | 1. Keyed P: DIN 6885; 2. Splined Z: DIN 5480 | SAE 2 in, 4-M20 × 2.5 depth 25 mm | SAE 5 in, 4-M16 × 2.0 depth 24 mm | DIN 3852 M48 × 2 depth 22 mm | DIN 3852 M18 × 1.5 depth 12 mm | MB: M18 × 1.5 (400 bar); MS: M18 × 1.5 (30 bar) |
| HYH4VSO 750 | 30 | 8-bolt flange (pilot Ø 400 mm, 8-Ø30 mm holes) | 1. Keyed P: DIN 6885; 2. Splined Z: DIN 5480 | SAE 2 in, 4-M20 × 2.5 depth 25 mm | SAE 5 in, 4-M16 × 2.0 depth 24 mm | DIN 3852 M48 × 2 depth 22 mm | DIN 3852 M18 × 1.5 depth 12 mm | MB: M18 × 1.5 (400 bar); MS: M18 × 1.5 (30 bar) |
| HYH4VSO 1000 | 30 | 8-bolt flange (pilot Ø 450 mm, 8-Ø33 mm holes) | 1. Keyed P: DIN 6885; 2. Splined Z: DIN 5480 | SAE 2 in, 4-M20 × 2.5 depth 30 mm | SAE 5 in, 4-M16 × 2.0 depth 24 mm | DIN 3852 M48 × 2 depth 22 mm | DIN 3852 M18 × 1.5 depth 12 mm | MB: M18 × 1.5 (400 bar); MS: M18 × 1.5 (30 bar) |
Note: Depending on installation position, drain port T, K1, K2 or R(L) must be connected to tank below minimum fluid level. Drive shaft coupling must be equipped with flexible element.
Pump Installation Specifications
Comprehensive Ordering Code Structure (Aligned with RE 92050 Series 1x and 30)
HYH4VS−O−Size−Control/Series−Rotation−Seals−Shaft−Flange−PortPlate−ThroughDrive−Filtration
| 01 | Hydraulic Fluid | Without code = Mineral oil and HFD hydraulic fluids; E = HFA, HFB, and HFC fire-resistant hydraulic fluids (NBR/PTFE seals, code P in position 09); H = High-speed rotary group version (sizes 71, 180, 250, 260, 355, 370, 500) |
|---|---|---|
| 02 | Axial Piston Unit | HYH4VS = Swashplate axial piston variable displacement pump, nominal pressure 350 bar, peak pressure 400 bar |
| 03 | Charge Pump (Impeller) | Without code = Standard without charge pump; L = With integrated charge pump (open circuit A4VSLO, size 750 with port plate 25, counter-clockwise L) |
| 04 | Operating Mode | O = Open circuit pump (Pumpe, offener Kreislauf) |
| 05 | Displacement Size (HYH4VSO) | 040, 071, 125, 180, 250, 260, 355, 370, 500, 750, 1000 cm³/rev |
| 06 | Control Device | DR = Hydraulic pressure controller, one-sided swiveling; DP = Pressure controller for parallel operation; FR = Flow controller; DFR = Pressure and flow controller (load sensing); LR = Power controller with hyperbolic characteristic curve; MA = Manual lever control; EM = Electric motor control; HM = Hydraulic control, volume dependent; HS5 = Digital electro-hydraulic pump control system; EO = Analog electro-hydraulic pump control system; HD = Hydraulic control, pressure dependent (pilot control); EZ = Two-point electric control (12 V / 24 V DC); DS3 = Secondary controlled pressure controller; DFE1 = Electro-hydraulic control system with integrated proportional valve; SYDFE = System solution for servo-variable pump systems |
| 07 | Series | 10 / 11 = Series 1, index 0 / index 1 (sizes 40 and 71); 30 = Series 3, index 0 (sizes 125, 180, 250, 260, 355, 370, 500, 750, 1000) |
| 08 | Direction of Rotation | R = Clockwise; L = Counter-clockwise (viewed from drive shaft end) |
| 09 | Sealing Material | V = FKM (fluorocarbon rubber, standard for mineral oil and HFD); P = NBR nitrile rubber with PTFE shaft seal (for HFA, HFB, HFC fluids); F = Special version for enhanced-power HFC operation |
| 10 | Drive Shaft | P = Parallel cylindrical keyed shaft according to DIN 6885; Z = Involute splined shaft according to DIN 5480 |
| 11 | Mounting Flange | B = ISO 3019-2 metric 4-hole flange (sizes 40 to 500); H = ISO 3019-2 metric 8-hole flange (sizes 750 and 1000) |
| 12 | Working Port Configuration | 13 = Standard: Ports B and S SAE flange lateral, offset 90°, metric fastening thread (only with N00 or K.. through-drives); 25 = Standard & High-Speed: Ports B and S SAE lateral, offset 90°, 2nd pressure port B1 opposite B plugged with flange plate upon delivery; 36 = High-Speed: Ports B and S SAE lateral, offset 90°, 2nd port B1 plugged, with integrated PCV pulsation damping (pₙₒₘ=380 bar, pₘₐₓ=420 bar) |
| 13 | Through-Drive | N00 = Without through-drive (sealed rear end cover); K.. = With through-drive without conversion option; U.. = For universal through-drive (sizes 125 to 500); 99 = Prepared for through-drive, with pressure-resistant plugged cover; ISO / SAE mounting flange hubs: 01, 52, 68, 04, 06, E2, 15, 16, 07, 24, 96, 17, 84, 57, 31, 33, 34, 35, 77, 43, 76, 88, B2, B3, B4, E1, B5, B6, B8, B9, B7 |
| 14 | Filtration (DS.. Control Only) | N = Without filter; Z = Intermediate plate filter (for secondary controlled DS.. systems) |
Reading Your Replacement Code
Techspecs
4.1 Operating Pressure & Bearing Flushing Parameters (Aligned with RE 92050)
| Target Bosch Rexroth Part Code | HENGYUHANG HYH Equivalent | Interchange Verification Notes |
|---|---|---|
| A4VSO40DR/10R-PPB13N00 | HYH4VSO-040-DR/10-R-P-P-B-13-N00 | Direct 1:1 drop-in: HYH4VSO 40, DR pressure control, Series 10, keyed shaft P, ISO 4-bolt flange, lateral ports 13 |
| A4VSO71DFR/10R-VPB25N00 | HYH4VSO-071-DFR/10-R-V-P-B-25-N00 | Direct 1:1 drop-in: HYH4VSO 71, DFR pressure & flow control, Series 10, FKM seals, keyed shaft, 2nd port B1 plugged |
| A4VSO125LR2/30R-VPB25U04 | HYH4VSO-125-LR2/30-R-V-P-B-25-U04 | Direct 1:1 drop-in: HYH4VSO 125, LR2 hyperbolic power controller, Series 30, SAE B through-drive hub U04 |
| A4VSO180DR/30R-VZB25N00 | HYH4VSO-180-DR/30-R-V-Z-B-25-N00 | Direct 1:1 drop-in: HYH4VSO 180, DR pressure controller, Series 30, DIN 5480 splined shaft Z, ISO 4-bolt flange |
| A4VSO250HD1/30R-VPB25N00 | HYH4VSO-250-HD1/30-R-V-P-B-25-N00 | Direct 1:1 drop-in: HYH4VSO 250, HD1 hydraulic pilot pressure control, Series 30, keyed shaft P, 350/400 bar |
| A4VSO355DP/30R-VPB25N00 | HYH4VSO-355-DP/30-R-V-P-B-25-N00 | Direct 1:1 drop-in: HYH4VSO 355, DP parallel operation pressure controller, Series 30, ISO 4-bolt flange, 532 l/min |
| A4VSO500HS5/30R-VZB25N00 | HYH4VSO-500-HS5/30-R-V-Z-B-25-N00 | Direct 1:1 drop-in: HYH4VSO 500, HS5 digital electro-hydraulic control, Series 30, DIN 5480 splined shaft, 385 kW |
| A4VSO750DR/30R-VPH25N00 | HYH4VSO-750-DR/30-R-V-P-H-25-N00 | Direct 1:1 drop-in: HYH4VSO 750, DR pressure control, Series 30, ISO 8-bolt flange H, 400 mm pilot spigot, 525 kW |
| A4VSO1000LR2/30R-VPH25N00 | HYH4VSO-1000-LR2/30-R-V-P-H-25-N00 | Direct 1:1 drop-in: HYH4VSO 1000, LR2 hyperbolic power control, Series 30, ISO 8-bolt flange, 1000 cm³/rev, 583 kW |
| Parameter | Permissible Limit | Engineering Operating Conditions |
|---|---|---|
| Nominal Pressure (pₙₒₘ) | 350 bar (Port 13, 25); 380 bar (Port 36) | Continuous operating pressure across working port B |
| Maximum Peak Pressure (pₘₐₓ) | 400 bar (Port 13, 25); 420 bar (Port 36) | Maximum single operating period t≤1 s; total cumulative period ≤300 h (~1 million cycles) |
| Minimum Pressure (pB absolute) | Minimum 15 bar on high-pressure side B | Prevents swashplate and piston shoe separation during high-speed rotation |
| Rate of Pressure Change (RA) | Maximum 16,000 bar/s | Maximum allowable pressure gradient across working port during dynamic valve switching |
| Inlet Suction Pressure (Port S) | pₛₘᵢₙ ≥0.8 bar absolute; pₛₘₐₓ ≤30 bar | Standard version without charge pump; avoids cavitation at cylinder entry |
| Case Pressure (pₗ, Ports K1, K2, T, R) | Continuous pₗₘₐₓ ≤4 bar absolute | Momentary peaks (t<0.1 s) up to 6 bar absolute acceptable |
| Bearing Flushing Flow (qₛₚ) | 3 to 40 l/min across sizes 40 to 1000 | Recommended for long service life under high-pressure continuous duty cycles |
4.3 Hydraulic Fluid & Temperature Limits
Advantages
Continuous High-Pressure Rating up to 350/380 bar (Peak 400/420 bar)
High-integrity ductile cast iron housing construction eliminates structural deflection under severe cyclic hydraulic loading in heavy industrial machinery.
Integrated Pre-Compression Volume (PCV) Pulsation Damping
Built-in PCV chamber in port plate version 36 dynamically counteracts pressure overshoot and pre-compression shock, reducing fluid-borne pressure pulsations by up to 50% and substantially dampening machine airborne noise.
Extensive Range of Standardized Frame Sizes (40 to 1000 cm³/rev)
Covers the entire spectrum from medium-sized industrial units up to multi-megawatt heavy press drives, enabling equipment builders to source their complete pump portfolio from a single precision manufacturer.
Comprehensive Modular Control Systems
Supports hydraulic pressure cut-off (DR), parallel operation (DP), load-sensing flow regulation (FR/DFR), hyperbolic power limiting (LR), electrical motor control (EM), digital electrohydraulic control (HS5), and servo-variable pump integration (SYDFE).
Universal 100% Through-Drive Multi-Pump Capability
High-capacity through-drive splines and standardized ISO/SAE rear mounting interfaces allow 100% of the primary drive torque to be transmitted to secondary auxiliary pumps (gear, vane, or piston pumps) for compact multi-circuit power packs.
Seamless 1:1 OEM Drop-In Interchangeability for Rexroth Series 1x & 30
Identical ISO 3019-2 mounting pilots, shaft centerlines, SAE flange port dimensions, and controller mounting geometry guarantee direct mechanical and functional interchangeability without piping or baseplate rework.
Reference
Displacement & Control Configuration Matrix
Models Available: HYH4VSO 40, HYH4VSO 71, HYH4VSO 125, HYH4VSO 180, HYH4VSO 250, HYH4VSO 260, HYH4VSO 355, HYH4VSO 370, HYH4VSO 500, HYH4VSO 750, HYH4VSO 1000 (displacements 40 to 1000 cm³/rev).
Control Architectures Available:
DR / DP: Constant pressure regulation / parallel operation control for multiple pump power units.
FR / DFR: Dynamic load-sensing flow and pressure regulation for energy-efficient variable flow systems.
LR: Hyperbolic constant power controller with pressure cut-off and load-sensing override.
MA / EM: Manual lever positioning / electrical stepper motor control.
HM / HD: Hydraulic volume-dependent / pilot pressure-dependent proportional control.
HS5 / EO: Advanced digital / analog closed-loop electro-hydraulic displacement, pressure, and power control.
Mounting Standards: ISO 3019-2 4-bolt metric flanges (sizes 40 to 500) and 8-bolt metric flanges (sizes 750 and 1000) with DIN 6885 keyed and DIN 5480 splined shafts.
Target Brand Interchangeability Matrix
The HENGYUHANG HYH4VSO Series 1x and 30 delivers verified 1:1 drop-in replacement across the complete Bosch Rexroth A4VSO Series 1x and 30 portfolio:
Bosch Rexroth A4VSO40 Series 10 / 11 → HYH4VSO-040/10 (all control, shaft, flange, and port variants)
Bosch Rexroth A4VSO71 Series 10 / 11 → HYH4VSO-071/10 (all control, shaft, flange, and port variants)
Bosch Rexroth A4VSO125 Series 30 → HYH4VSO-125/30 (all control, shaft, flange, and port variants)
Bosch Rexroth A4VSO180 Series 30 → HYH4VSO-180/30 (all control, shaft, flange, and port variants)
Bosch Rexroth A4VSO250 Series 30 → HYH4VSO-250/30 (all control, shaft, flange, and port variants)
Bosch Rexroth A4VSO260 Series 30 → HYH4VSO-260/30 (all control, shaft, flange, and port variants)
Bosch Rexroth A4VSO355 Series 30 → HYH4VSO-355/30 (all control, shaft, flange, and port variants)
Bosch Rexroth A4VSO370 Series 30 → HYH4VSO-370/30 (all control, shaft, flange, and port variants)
Bosch Rexroth A4VSO500 Series 30 → HYH4VSO-500/30 (all control, shaft, flange, and port variants)
Bosch Rexroth A4VSO750 Series 30 → HYH4VSO-750/30 (all control, shaft, flange, and port variants)
Bosch Rexroth A4VSO1000 Series 30 → HYH4VSO-1000/30 (all control, shaft, flange, and port variants)
Brand Replacement
The HENGYUHANG HYH4VSO Series 1x and 30 is specifically manufactured as a high-precision, direct 1:1 drop-in replacement for the Bosch Rexroth A4VSO Series 1x (sizes 40 and 71) and Series 30 (sizes 125 to 1000) axial piston variable pump families. Manufactured in accordance with rigorous ISO 9001 quality management standards, each pump undergoes comprehensive dynamic testing on computerized high-pressure test benches to match Rexroth factory performance curves across control hysteresis, pressure response time (<50 ms), flow repeatability, and volumetric efficiency (>92%).
Utilizing standardized ISO 3019-2 metric mounting pilots (Ø125, Ø160, Ø180, Ø200, Ø224, Ø280, Ø315, Ø400, Ø450 mm), identical drive shaft centerlines, SAE J518 metric-threaded flange ports, and matching auxiliary control connections, HYH4VSO units mount directly onto existing machine baseplates and power unit skids without structural modifications, piping rework, or control re-tuning. Heavy equipment builders, steel mill maintenance divisions, shipyard hydraulic technicians, and industrial repair facilities benefit from seamless interchangeability, drastically reduced delivery lead times, and significant total cost savings.
Applications
Heavy Metal Forming & Extrusion Presses: Central hydraulic power drives for aluminum and copper extrusion presses, deep-drawing sheet metal presses, forging presses, and high-tonnage stamping lines requiring reliable 350 bar continuous pressure.
Plastic & Rubber Injection Molding Machines: Electro-hydraulic variable pump drives for high-capacity toggle clamp mechanisms, screw pre-plasticizing motors, and injection cylinders.
Steel Mill & Metallurgy Equipment: Continuous casting hydraulic stations, rolling mill roll gap adjustment systems, ladle furnace tilt mechanisms, and walking beam furnace drives.
Marine & Offshore Hydraulic Systems: High-power hydraulic power packs for deck cranes, anchor windlasses, constant-tension mooring winches, marine steering gear, and offshore drilling platform jacking systems.
Civil Engineering & Tunnel Boring Machines (TBM): Main hydraulic thrust cylinder drives, cutterhead drive power packs, and shield tunneling auxiliary circuits.
Mining & Material Handling: Centralized power packs for bucket wheel excavators, heavy stacker-reclaimers, underground crusher stations, and coal preparation plants.
Package & Shipping
| Parameter | Permissible Operating Limits | Optimal Recommended Target |
|---|---|---|
| Permissible Hydraulic Fluid | Mineral oil HLP according to DIN 51524 (HFD, HFA, HFB, HFC compliant) | Premium anti-wear mineral hydraulic fluid |
| Operating Viscosity (Continuous) | ν=10 to 400 mm²/s (cSt) | νₒₚₜ=16 to 36 mm²/s (cSt) |
| Cold Start Viscosity Limit | νₘₐₓ≤1,600 mm²/s (t≤3 min, p≤50 bar, n≤1,000 r/min) | System pre-warming cycle recommended |
| Short-Term Viscosity Limit | νₘᵢₙ=10 mm²/s (t≤3 min, p≤0.3×pₙₒₘ) | Measured at case drain port T / R(L) |
| Operating Temperature Range | FKM seals (Code V): −25 ∘C to +110 ∘C (−13 ∘F to +230 ∘F) | +30 ∘C to +65 ∘C (+86 ∘F to +149 ∘F) |
| Permissible ΔT (Pump to Fluid) | Maximum 25 K | Prevents thermal shock to cylinder block and cradle bearings |
| Required Fluid Cleanliness | ISO 4406 Class 20/18/15 (NAS 1638 Class 9) | ISO 4406 Class 19/17/14 recommended for long service life |
| Packaging Construction | Heavy-duty export fumigation-free wooden case with custom-molded high-density internal positioning cradles |
|---|---|
| Corrosion Protection | Internal test fluid preservation, external anti-rust oil coating, and vapor corrosion inhibitor (VCI) heat-sealed barrier bag |
| Port & Shaft Protection | Heavy-duty threaded steel/plastic port sealing plugs and precision plastic drive shaft protective sleeves |
| Package Dimensions | Approx. 520 × 360 × 340 mm (HYH4VSO 40/71) up to 1,450 × 950 × 850 mm (HYH4VSO 750/1000) |
| Gross Weight | Approx. 48 kg (HYH4VSO 40) up to 680 kg (HYH4VSO 1000) |
| Standard Lead Time | 3 – 5 business days for standard stocked configurations; 15 – 25 business days for volume OEM production batches |
| Global Shipping Options | Express air courier (DHL / FedEx / UPS / TNT) for emergency breakdown replacements; Ocean FCL/LCL and Air cargo for volume commercial orders |
| Custom Documentation | Certificate of conformity, factory computerized dynamic test bench graphs, and OEM private-label nameplates supported |
Why Choose Hengyuhang?
Direct Factory Precision Manufacturing & CNC Excellence: Manufactured in our state-of-the-art production facility equipped with high-precision 4-axis and 5-axis CNC machining centers, automated gear hobbing, and CNC gear tooth profile grinding (Ra < 0.2 μm) to ensure superior surface finish, ultra-tight internal clearances, and maximum volumetric efficiency.
100% Full-Cycle Multi-Parameter Factory Inspection: Every single pump undergoes computerized testing before packaging, verifying flow rate at rated speed, volumetric efficiency (>91–93%), mechanical efficiency, continuous and peak pressure hold, internal bypass, and noise spectrum. Zero untested units leave the factory.
Seamless 1:1 OEM Drop-In Interchangeability: Dimensionally matched to European, SAE, and DIN standards, providing 1:1 direct mechanical interchangeability across premier global brands (Bosroth Rexroth, Parker, Danfoss, etc.) with zero mounting modifications required.
Flexible Engineering Customization & Rapid Prototyping: Supported by a senior fluid power engineering team, offering custom displacement combinations, specialized shaft tapers, splines, integrated priority or relief valves, and non-standard port orientations with rapid sample prototyping and low MOQ requirements.
Robust Supply Chain, Extensive Inventory & Fast Global Dispatch: Extensive raw material stock of high-grade ductile cast iron castings, alloy steel gear sets, and bearing assemblies enables rapid assembly and 48–72 hour dispatch for emergency breakdown replacements, supported by complete export logistics.
12-Month Comprehensive Warranty & Lifetime Technical Support: All pumps are backed by a comprehensive 12-month manufacturer warranty against defects in materials and workmanship, supplemented by 24/7 engineering consultation, CAD drawing verification, and lifecycle technical assistance.
HENGYUHANG Axial Piston Variable Displacement Pump HYH4VSO Series 1x and 30 (Heavy-Duty Swashplate Design Open-Circuit Hydraulic Pump, 40.00~1000.00 cm³/rev) is a high-pressure, robust industrial swashplate-design axial piston variable displacement pump engineered specifically for open-circuit hydrostatic drives in severe-duty stationary industrial installations, heavy metalforming presses, marine and offshore engineering, steel mills, and mining machinery. Manufactured as a dedicated custom replacement benchmarked directly against the global industrial benchmark Bosch Rexroth A4VSO Series 1x (Series 10/11 covering frame sizes 40 and 71 cm³/rev) and Series 30 (covering frame sizes 125, 180, 250, 260, 355, 370, 500, 750, and 1000 cm³/rev), the HYH4VSO pump features an optimized swashplate cradle bearing rotary group that delivers steplessly variable output flow proportional to drive speed and swashplate tilt angle. Engineered to withstand continuous heavy-duty industrial cyclic loading, the pump operates at a continuous nominal working pressure (p_nom) of 350 bar (5,100 psi / 35 MPa) across standard ports (with up to 380 bar / 5,500 psi on rear port plate version 36) and a maximum peak pressure (p_max) of 400 bar (5,800 psi / 40 MPa; up to 420 bar / 6,100 psi on port plate 36). Spanning 11 standardized displacement sizes from 40.0 to 1000.0 cm³/rev (2.44 to 61.02 in³/rev), the HYH4VSO series features ISO 3019-2 metric 4-hole and 8-hole mounting flanges, DIN 6885 parallel keyed shafts, DIN 5480 involute splined shafts, heavy-duty SAE J518 Code 62 high-pressure working ports (3/4 in to 2 in), SAE J518 Code 61 suction ports (1 1/2 in to 5 in), full-torque rear through-drive configurations for auxiliary secondary pumps (A4VSO+A4VSO tandem combinations), and an extensive modular portfolio of hydraulic, mechanical, electrical, and electronic controllers (DR, DP, FR, DFR, LR, MA, EM, HM, HS5, EO, HD, and DS3), providing an exact custom-engineered drop-in replacement solution for demanding industrial fluid power systems.
| Applications
The HYH4VSO Series 1x and 30 open-circuit variable axial piston pump is designed for high-pressure heavy industrial machinery and marine deck systems requiring continuous multi-shift durability and high dynamic response:
Heavy Metalforming, Forging & Extrusion Presses: Powers high-tonnage hydraulic forging presses, stamping presses, scrap metal balers, and aluminum extrusion lines operating at continuous 350 to 380 bar system pressure.
Steel Mill & Metallurgy Plants: Drives continuous casting machines, rolling mill roll gap adjustments, slab transfer tables, and electric arc furnace tilting hydraulics with high thermal and shock load tolerance.
Plastic Injection Molding & Die Casting Equipment: Delivers precise, fast-response proportional pressure and flow control for large-scale clamping, injection, and plasticizing circuits.
Marine Deck Machinery & Offshore Winch Drives: Drives heavy mooring winches, anchor windlasses, offshore knuckle-boom pedestal cranes, and pipelay tensioner systems exposed to demanding marine environments.
Mining, Quarrying & Tunnel Boring Machines (TBM): Supplies continuous fluid power to tunnel boring cutterheads, hydraulic rock crushers, underground feeder breakers, and mining shovels.
Civil Engineering & Hydraulic Test Benches: Powers dam floodgate hydraulic hoists, large bridge jacking systems, and aerospace hydraulic component test rigs requiring precise servo-valve swashplate angle positioning (HS5/EO controls).
| Key Specifications Overview
| Parameter | Benchmark Engineering Specification (Rexroth A4VSO Target Standard) |
|---|---|
| Pump Architecture | Variable Swashplate Axial Piston Unit for Open-Circuit Industrial Hydrostatic Drives |
| Series Build Standard | Series 1x (Series 10/11 for sizes 40 and 71 cm³/rev); Series 30 (for sizes 125, 180, 250, 260, 355, 370, 500, 750, and 1000 cm³/rev) |
| Displacement Spectrum | 11 Standard Frame Sizes: HYH4VSO 40, 71, 125, 180, 250, 260, 355, 370, 500, 750, and 1000 cm³/rev (2.44 to 61.02 in³/rev) |
| Continuous Nominal Pressure (p_nom) | 350 bar (5,100 psi / 35 MPa) continuous working pressure (standard ports 13/25); up to 380 bar (5,500 psi / 38 MPa) with rear port plate 36 |
| Maximum Peak Operating Pressure (p_max) | 400 bar (5,800 psi / 40 MPa) maximum pressure (ports 13/25); up to 420 bar (6,100 psi / 42 MPa) with rear port plate 36 (single period 1 s, cumulative 300 h) |
| Minimum Pressure at High-Pressure Port B (p_B abs) | 15 bar (217 psi) absolute minimum pressure required at port B to prevent internal separation during swashplate deceleration |
| Maximum Rate of Pressure Change (RA_max) | 16,000 bar/s (232,000 psi/s) maximum permissible rate of pressure build-up and reduction across the operating range |
| Suction Port Pressure Range (p_S abs) | Minimum suction pressure p_S ≥ 0.8 bar (11.6 psi) absolute (without charge pump); maximum permissible suction pressure up to 30 bar with auxiliary charge pump |
| Case Drain Pressure Limit (p_L max) | Maximum continuous case pressure: 2.0 bar (29 psi) absolute; Intermittent cold-start maximum: 3.0 bar (43.5 psi) absolute |
| Nominal Drive Speed Range (n_nom @ Vg_max) | Standard Rotary Group: 2600 rpm (40), 2200 rpm (71), 1800 rpm (125/180), 1500 rpm (250~370), 1320 rpm (500), 1200 rpm (750), 1000 rpm (1000) |
| High-Speed Rotary Group Option | High-Speed Version available for sizes 71 to 500: up to 3000 rpm (71), 2200 rpm (180), 1900 rpm (250/260), 1700 rpm (355/370), 1500 rpm (500) |
| Delivery Flow Range @ n_nom (qv @ Vg_max) | 104 L/min (40) up to 1000 L/min (1000) in standard rotary group; up to 1125 L/min for size 750 with integrated charge pump |
| Drive Power Consumption @ 350 bar (P @ n_nom) | 61 kW (40), 91 kW (71), 131 kW (125), 189 kW (180), 219 kW (250), 311 kW (355), 385 kW (500), 525 kW (750), 583 kW (1000) |
| Torque Output @ 350 bar (M_max @ Vg_max) | 223 Nm (40), 395 Nm (71), 696 Nm (125), 1002 Nm (180), 1391 Nm (250), 1976 Nm (355), 2783 Nm (500), 4174 Nm (750), 5565 Nm (1000) |
| Mounting Flange Standards (ISO 3019-2) | Metric 4-hole flange: 125B4HW (40), 140B4HW (71), 160B4HW (125/180), 224B4HW (250~370); Metric 8-hole flange: 250B8HW (500), 315B8HW (750), 400B8HW (1000) |
| Drive Shaft Configurations | Parallel keyed shaft with feather key according to DIN 6885 (Shaft P) or involute splined shaft according to DIN 5480 (Shaft Z) |
| Working Port B Connection Standard | SAE J518 Code 62 high-pressure flange ports (3/4 in, 1 in, 1 1/4 in, 1 1/2 in, 2 in) with metric DIN 13 fastening threads |
| Suction Port S Connection Standard | SAE J518 Code 61 standard-pressure flange ports (1 1/2 in, 2 in, 2 1/2 in, 3 in, 4 in, 5 in) with metric DIN 13 fastening threads |
| Through-Drive Auxiliary Combinations | Full-power tandem through-drive capabilities: A4VSO + A4VSO (same or smaller frame sizes) and SAE A, B, C, D auxiliary adapters |
| Fluid Temperature & Viscosity Limits | Operating temperature: -25°C to +90°C (FKM seals standard); Viscosity range: 16 to 36 mm²/s optimal (10 to 1000 mm²/s permissible limits) |
| Fluid Cleanliness Standard | ISO 4406 Class 18/16/13 minimum cleanliness level for long service life at continuous 350 bar operation |
| Technical Performance Matrix Across Available Sizes
| Model Code (Custom Replacement) | Displacement Vg_max (cm³/rev) | Rotational Speed (rpm) | Flow @ n_nom (L/min) | Drive Power @ 350 bar (kW) | Torque Output (Nm) | Case Vol. (L) | Pump Mass (kg, approx) | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Standard (n_nom) | High-Speed | @ n_nom | @ 1500 rpm | @ 1800 rpm | @ 350 bar | @ 100 bar | |||||
| HYH4VSO 040 (Series 10/11) | 40.0 | 2600 | – | 104.0 | 61.0 | 35.0 | 42.0 | 223 | 64 | 2.0 | 39.0 |
| HYH4VSO 071 (Series 10/11) | 71.0 | 2200 | 3000 | 156.0 | 91.0 | 62.0 | 74.0 | 395 | 113 | 2.5 | 53.0 |
| HYH4VSO 125 (Series 30) | 125.0 | 1800 | – | 225.0 | 131.0 | 109.0 | 131.0 | 696 | 199 | 5.0 | 88.0 |
| HYH4VSO 180 (Series 30) | 180.0 | 1800 | 2200 | 324.0 | 189.0 | 158.0 | 189.0 | 1002 | 286 | 4.0 | 102.0 |
| HYH4VSO 250 (Series 30) | 250.0 | 1500 | 1900 | 375.0 | 219.0 | 219.0 | – | 1391 | 398 | 10.0 | 184.0 |
| HYH4VSO 260 (Series 30) | 260.0 | 1500 | 1900 | 390.0 | 228.0 | 228.0 | – | 1448 | 414 | 10.0 | 184.0 |
| HYH4VSO 355 (Series 30) | 355.0 | 1500 | 1700 | 532.0 | 311.0 | 311.0 | – | 1976 | 564 | 8.0 | 207.0 |
| HYH4VSO 370 (Series 30) | 370.0 | 1500 | 1700 | 555.0 | 323.0 | 323.0 | – | 2061 | 589 | 8.0 | 207.0 |
| HYH4VSO 500 (Series 30) | 500.0 | 1320 | 1500 | 660.0 | 385.0 | 339.0 | – | 2783 | 795 | 14.0 | 320.0 |
| HYH4VSO 750 (Series 30) | 750.0 | 1200 | 1500 | 900.0 | 525.0 | 449.0 | – | 4174 | 1193 | 19.0 | 460.0 |
| HYH4VSO 1000 (Series 30) | 1000.0 | 1000 | 1200 | 1000.0 | 583.0 | – | – | 5565 | 1590 | 27.0 | 605.0 |
| Modular Control Devices and Operating Principles
| Control Code | Control Mechanism | Operating Parameters & Input | Functional Dynamics & Press Control Benefit |
|---|---|---|---|
| DR / DRG | Hydraulic Pressure Controller (Constant Pressure Control) | Setting range: 50 to 350 bar (ports 13/25); DRG includes remote pressure relief pilot connection via port X (G 1/4) | Maintains constant hydraulic system working pressure regardless of actuator load demand. The pump destrokes to zero displacement (Vg_0) once target pressure is achieved, minimizing idling power loss. |
| DP | Pressure Controller for Multi-Pump Parallel Operation | Cross-sensing pressure balancing via pilot port X; Differential pressure Δp = approx. 10 ~ 15 bar | Enables multiple large-displacement variable pumps to discharge into a unified high-pressure press manifold with equal load sharing and synchronized swashplate movement. |
| DFR / FR | Pressure and Flow Controller (Load-Sensing LS Control) | Flow differential pressure: Δp = 10 to 22 bar (standard setting 14 bar); Pressure cutoff: 50 to 350 bar | Matches pump displacement and delivery pressure precisely to the flow demand of the active actuator orifice, eliminating throttle throttling losses on metalforming press auxiliary circuits. |
| LR2 / LR3 / LRD | Hyperbolic Power Controller (Constant Power Limiter) | Adjustable spring-loaded hyperbolic torque limiter curve; LRD incorporates pressure cutoff override | Keeps prime mover electric motor input power strictly constant according to p × Vg = constant, preventing AC induction motor stalling during maximum high-pressure pressing strokes. |
| MA / EM | Manual Handwheel (MA) or Electric Motor Adjustment (EM) | MA: manual spindle handwheel with dial position indicator; EM: 24 V DC or 230 V AC geared servomotor drive with limit switches | Enables stepless manual or motorized remote mechanical adjustment of maximum displacement stop for continuous extrusion lines and chemical batching pumps. |
| HM / HD | Hydraulic Control, Flow-Dependent (HM) or Pilot-Pressure Dependent (HD) | HD: pilot pressure range p_St = 10 to 35 bar applied at port Y; HM: control fluid flow volume dependent | Stepless hydraulic remote control of swashplate angle from pilot joystick or remote proportional pressure relief valves in explosion-proof hazardous environments. |
| HS5 / EO / SYDFE | High-Response Proportional Electro-Hydraulic Servo Valve Control | Integrated LVDT inductive swashplate position transducer; 24 V DC proportional directional servo valve with onboard digital amplifier card | Delivers millisecond-level dynamic closed-loop swashplate position control (swivel time < 40 ms) for advanced CNC press brakes, die-casting machines, and aerospace simulation test benches. |
| Mounting Flange, Shaft and Port Specifications
| Model Size | Mounting Flange (ISO 3019-2 Metric) | Drive Shaft (DIN 6885 Keyed / DIN 5480 Splined) | High-Pressure & Auxiliary Ports (SAE J518 / ISO 6149) |
|---|---|---|---|
| HYH4VSO 040 | ISO 3019-2 125B4HW (4-hole); Centering pilot Ø125 mm (-0.063 mm); Bolt circle Ø160 mm; 4 × Ø18 mm holes | Shaft P: Parallel keyed AS10 × 8 × 56 (shaft Ø32 mm); Shaft Z: Splined DIN 5480 W32 × 2 × 14 × 9g | Port B (Working): SAE J518 Code 62 3/4 in (M10 × 1.5, 17 deep, 400 bar max); Port S (Suction): SAE J518 Code 61 1 1/2 in (M12 × 1.75, 20 deep); Drain K1/K2: ISO 6149 M22 × 1.5 |
| HYH4VSO 071 | ISO 3019-2 140B4HW (4-hole); Centering pilot Ø140 mm (-0.063 mm); Bolt circle Ø180 mm; 4 × Ø18 mm holes | Shaft P: Parallel keyed AS12 × 8 × 68 (shaft Ø40 mm); Shaft Z: Splined DIN 5480 W40 × 2 × 18 × 9g | Port B (Working): SAE J518 Code 62 1 in (M12 × 1.75, 20 deep, 400 bar max); Port S (Suction): SAE J518 Code 61 2 in (M12 × 1.75, 20 deep); Drain K1/K2: ISO 6149 M27 × 2 |
| HYH4VSO 125 | ISO 3019-2 160B4HW (4-hole); Centering pilot Ø160 mm (-0.063 mm); Bolt circle Ø200 mm; 4 × Ø22 mm holes | Shaft P: Parallel keyed AS14 × 9 × 80 (shaft Ø50 mm); Shaft Z: Splined DIN 5480 W50 × 2 × 24 × 9g | Port B (Working): SAE J518 Code 62 1 1/4 in (M14 × 2, 19 deep, 400 bar max); Port S (Suction): SAE J518 Code 61 2 1/2 in (M12 × 1.75, 20 deep); Drain K1/K2: ISO 6149 M33 × 2 |
| HYH4VSO 180 | ISO 3019-2 160B4HW (4-hole); Centering pilot Ø160 mm (-0.063 mm); Bolt circle Ø200 mm; 4 × Ø22 mm holes | Shaft P: Parallel keyed AS14 × 9 × 80 (shaft Ø50 mm); Shaft Z: Splined DIN 5480 W50 × 2 × 24 × 9g | Port B (Working): SAE J518 Code 62 1 1/4 in (M14 × 2, 19 deep, 400 bar max); Port S (Suction): SAE J518 Code 61 3 in (M16 × 2, 25 deep); Drain K1/K2: ISO 6149 M33 × 2 |
| HYH4VSO 250 / 260 | ISO 3019-2 224B4HW (4-hole); Centering pilot Ø224 mm (-0.072 mm); Bolt circle Ø250 mm; 4 × Ø22 mm holes | Shaft P: Parallel keyed AS18 × 11 × 100 (shaft Ø60 mm); Shaft Z: Splined DIN 5480 W60 × 2 × 28 × 9g | Port B (Working): SAE J518 Code 62 1 1/2 in (M16 × 2, 24 deep, 420 bar max); Port S (Suction): SAE J518 Code 61 3 in (M16 × 2, 25 deep); Drain K1/K2: ISO 6149 M42 × 2 |
| HYH4VSO 355 / 370 | ISO 3019-2 224B4HW (4-hole); Centering pilot Ø224 mm (-0.072 mm); Bolt circle Ø250 mm; 4 × Ø22 mm holes | Shaft P: Parallel keyed AS20 × 12 × 100 (shaft Ø70 mm); Shaft Z: Splined DIN 5480 W70 × 3 × 22 × 9g | Port B (Working): SAE J518 Code 62 1 1/2 in (M16 × 2, 24 deep, 420 bar max); Port S (Suction): SAE J518 Code 61 4 in (M16 × 2, 25 deep); Drain K1/K2: DIN 3852 M42 × 2 |
| HYH4VSO 500 | ISO 3019-2 250B8HW (8-hole); Centering pilot Ø250 mm (-0.072 mm); Bolt circle Ø300 mm; 8 × Ø22 mm holes | Shaft P: Parallel keyed AS22 × 14 × 125 (shaft Ø80 mm); Shaft Z: Splined DIN 5480 W80 × 3 × 25 × 9g | Port B (Working): SAE J518 Code 62 2 in (M20 × 2.5, 30 deep, 400 bar max); Port S (Suction): SAE J518 Code 61 5 in (M16 × 2, 25 deep); Drain K1/K2: DIN 3852 M48 × 2 |
| HYH4VSO 750 | ISO 3019-2 315B8HW (8-hole); Centering pilot Ø315 mm (-0.081 mm); Bolt circle Ø380 mm; 8 × Ø26 mm holes | Shaft P: Parallel keyed AS25 × 14 × 125 (shaft Ø90 mm); Shaft Z: Splined DIN 5480 W90 × 3 × 28 × 9g | Port B (Working): SAE J518 Code 62 2 in (M20 × 2.5, 30 deep, 400 bar max); Port S (Suction): SAE J518 Code 61 5 in (M16 × 2, 25 deep); Drain K1/K2: DIN 3852 M48 × 2 |
| HYH4VSO 1000 | ISO 3019-2 400B8HW (8-hole); Centering pilot Ø400 mm (-0.089 mm); Bolt circle Ø450 mm; 8 × Ø26 mm holes | Shaft P: Parallel keyed AS28 × 16 × 160 (shaft Ø100 mm); Shaft Z: Splined DIN 5480 W100 × 3 × 32 × 9g | Port B (Working): SAE J518 Code 62 2 in (M20 × 2.5, 30 deep, 400 bar max); Port S (Suction): SAE J518 Code 61 5 in (M16 × 2, 25 deep); Drain K1/K2: DIN 3852 M48 × 2 |
| Direct Interchangeability and OEM Replacement Matrix (Rexroth A4VSO Series 1x & 30)
| Hengyuhang Series | OEM Target Model | OEM Reference Code | Custom Replacement & Field Compliance |
|---|---|---|---|
| HYH4VSO 040 | Bosch Rexroth A4VSO 40 Series 10/11 | A4VSO 40 DR / 10R-PPB13N00 | Direct drop-in replacement for compact industrial hydraulic power units; identical ISO 3019-2 125B4HW mounting flange, Ø32 keyed or W32 splined shaft, and SAE 3/4 in Code 62 working port. |
| HYH4VSO 071 | Bosch Rexroth A4VSO 71 Series 10/11 | A4VSO 71 DR / 10R-PPB13N00 | Exact replacement for metal processing and machine tool power packs; identical ISO 140B4HW flange, Ø40 keyed shaft, SAE 1 in Code 62 working port, and 156 L/min flow @ 2200 rpm. |
| HYH4VSO 125 | Bosch Rexroth A4VSO 125 Series 30 | A4VSO 125 DR / 30R-PPB13N00 | Custom replacement for hydraulic stamping and compression presses; features ISO 160B4HW flange, Ø50 keyed or W50 splined shaft, SAE 1 1/4 in Code 62 port, and 225 L/min delivery @ 1800 rpm. |
| HYH4VSO 180 | Bosch Rexroth A4VSO 180 Series 30 | A4VSO 180 DFR / 30R-PPB13N00 | High-demand replacement for scrap shears, plastic molding, and marine winches; features ISO 160B4HW flange, Ø50 shaft, SAE 1 1/4 in Code 62 port, and 189 kW drive power @ 1800 rpm. |
| HYH4VSO 250 / 260 | Bosch Rexroth A4VSO 250/260 Series 30 | A4VSO 250 LR2 / 30R-VPB25N00 | Heavy-duty replacement for large extrusion presses and metallurgical plants; identical ISO 224B4HW flange, Ø60 keyed or W60 splined shaft, SAE 1 1/2 in Code 62 port, and 1391 Nm torque @ 350 bar. |
| HYH4VSO 355 / 370 | Bosch Rexroth A4VSO 355/370 Series 30 | A4VSO 355 DFR / 30R-VPB25N00 | High-capacity replacement for severe-duty forging presses and mining excavators; identical ISO 224B4HW flange, Ø70 shaft, SAE 1 1/2 in Code 62 port, and 532 L/min delivery @ 1500 rpm. |
| HYH4VSO 500 | Bosch Rexroth A4VSO 500 Series 30 | A4VSO 500 LR2 / 30R-VPH25N00 | High-tonnage press replacement; features ISO 250B8HW 8-hole flange, Ø80 shaft, SAE 2 in Code 62 port, SAE 5 in Code 61 suction port, and 2783 Nm torque @ 350 bar. |
| HYH4VSO 750 | Bosch Rexroth A4VSO 750 Series 30 | A4VSO 750 DR / 30R-VPH25N00 | Extreme-scale industrial replacement for shipyard presses and steel mills; features ISO 315B8HW 8-hole flange, Ø90 shaft, SAE 2 in Code 62 port, and 4174 Nm torque @ 350 bar. |
| HYH4VSO 1000 | Bosch Rexroth A4VSO 1000 Series 30 | A4VSO 1000 DR / 30R-VPH25N00 | Maximum-displacement open-circuit hydraulic replacement; features ISO 400B8HW 8-hole flange, Ø100 shaft, SAE 2 in Code 62 port, 1000 L/min flow, and 5565 Nm torque @ 350 bar. |
| HYH4VSO Combination | Rexroth Combination Pump A4VSO+A4VSO | A4VSO...UB7 + A4VSO...N00 | Direct tandem pump assembly without splitter gearboxes; supports multiple independent open-loop circuits on a single main electric drive motor. |
| Technical Performance Matrix Across Available Sizes
| Model Code (Custom Replacement) | Displacement Vg_max (cm³/rev) | Rotational Speed (rpm) | Flow @ n_nom (L/min) | Drive Power @ 350 bar (kW) | Torque Output (Nm) | Case Vol. (L) | Pump Mass (kg, approx) | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Standard (n_nom) | High-Speed | @ n_nom | @ 1500 rpm | @ 1800 rpm | @ 350 bar | @ 100 bar | |||||
| HYH4VSO 040 (Series 10/11) | 40.0 | 2600 | – | 104.0 | 61.0 | 35.0 | 42.0 | 223 | 64 | 2.0 | 39.0 |
| HYH4VSO 071 (Series 10/11) | 71.0 | 2200 | 3000 | 156.0 | 91.0 | 62.0 | 74.0 | 395 | 113 | 2.5 | 53.0 |
| HYH4VSO 125 (Series 30) | 125.0 | 1800 | – | 225.0 | 131.0 | 109.0 | 131.0 | 696 | 199 | 5.0 | 88.0 |
| HYH4VSO 180 (Series 30) | 180.0 | 1800 | 2200 | 324.0 | 189.0 | 158.0 | 189.0 | 1002 | 286 | 4.0 | 102.0 |
| HYH4VSO 250 (Series 30) | 250.0 | 1500 | 1900 | 375.0 | 219.0 | 219.0 | – | 1391 | 398 | 10.0 | 184.0 |
| HYH4VSO 260 (Series 30) | 260.0 | 1500 | 1900 | 390.0 | 228.0 | 228.0 | – | 1448 | 414 | 10.0 | 184.0 |
| HYH4VSO 355 (Series 30) | 355.0 | 1500 | 1700 | 532.0 | 311.0 | 311.0 | – | 1976 | 564 | 8.0 | 207.0 |
| HYH4VSO 370 (Series 30) | 370.0 | 1500 | 1700 | 555.0 | 323.0 | 323.0 | – | 2061 | 589 | 8.0 | 207.0 |
| HYH4VSO 500 (Series 30) | 500.0 | 1320 | 1500 | 660.0 | 385.0 | 339.0 | – | 2783 | 795 | 14.0 | 320.0 |
| HYH4VSO 750 (Series 30) | 750.0 | 1200 | 1500 | 900.0 | 525.0 | 449.0 | – | 4174 | 1193 | 19.0 | 460.0 |
| HYH4VSO 1000 (Series 30) | 1000.0 | 1000 | 1200 | 1000.0 | 583.0 | – | – | 5565 | 1590 | 27.0 | 605.0 |
| Hengyuhang Series | OEM Target Model | OEM Reference Code | Custom Replacement & Field Compliance |
|---|---|---|---|
| HYH4VSO 040 | Bosch Rexroth A4VSO 40 Series 10/11 | A4VSO 40 DR / 10R-PPB13N00 | Direct drop-in replacement for compact industrial hydraulic power units; identical ISO 3019-2 125B4HW mounting flange, Ø32 keyed or W32 splined shaft, and SAE 3/4 in Code 62 working port. |
| HYH4VSO 071 | Bosch Rexroth A4VSO 71 Series 10/11 | A4VSO 71 DR / 10R-PPB13N00 | Exact replacement for metal processing and machine tool power packs; identical ISO 140B4HW flange, Ø40 keyed shaft, SAE 1 in Code 62 working port, and 156 L/min flow @ 2200 rpm. |
| HYH4VSO 125 | Bosch Rexroth A4VSO 125 Series 30 | A4VSO 125 DR / 30R-PPB13N00 | Custom replacement for hydraulic stamping and compression presses; features ISO 160B4HW flange, Ø50 keyed or W50 splined shaft, SAE 1 1/4 in Code 62 port, and 225 L/min delivery @ 1800 rpm. |
| HYH4VSO 180 | Bosch Rexroth A4VSO 180 Series 30 | A4VSO 180 DFR / 30R-PPB13N00 | High-demand replacement for scrap shears, plastic molding, and marine winches; features ISO 160B4HW flange, Ø50 shaft, SAE 1 1/4 in Code 62 port, and 189 kW drive power @ 1800 rpm. |
| HYH4VSO 250 / 260 | Bosch Rexroth A4VSO 250/260 Series 30 | A4VSO 250 LR2 / 30R-VPB25N00 | Heavy-duty replacement for large extrusion presses and metallurgical plants; identical ISO 224B4HW flange, Ø60 keyed or W60 splined shaft, SAE 1 1/2 in Code 62 port, and 1391 Nm torque @ 350 bar. |
| HYH4VSO 355 / 370 | Bosch Rexroth A4VSO 355/370 Series 30 | A4VSO 355 DFR / 30R-VPB25N00 | High-capacity replacement for severe-duty forging presses and mining excavators; identical ISO 224B4HW flange, Ø70 shaft, SAE 1 1/2 in Code 62 port, and 532 L/min delivery @ 1500 rpm. |
| HYH4VSO 500 | Bosch Rexroth A4VSO 500 Series 30 | A4VSO 500 LR2 / 30R-VPH25N00 | High-tonnage press replacement; features ISO 250B8HW 8-hole flange, Ø80 shaft, SAE 2 in Code 62 port, SAE 5 in Code 61 suction port, and 2783 Nm torque @ 350 bar. |
| HYH4VSO 750 | Bosch Rexroth A4VSO 750 Series 30 | A4VSO 750 DR / 30R-VPH25N00 | Extreme-scale industrial replacement for shipyard presses and steel mills; features ISO 315B8HW 8-hole flange, Ø90 shaft, SAE 2 in Code 62 port, and 4174 Nm torque @ 350 bar. |
| HYH4VSO 1000 | Bosch Rexroth A4VSO 1000 Series 30 | A4VSO 1000 DR / 30R-VPH25N00 | Maximum-displacement open-circuit hydraulic replacement; features ISO 400B8HW 8-hole flange, Ø100 shaft, SAE 2 in Code 62 port, 1000 L/min flow, and 5565 Nm torque @ 350 bar. |
| HYH4VSO Combination | Rexroth Combination Pump A4VSO+A4VSO | A4VSO...UB7 + A4VSO...N00 | Direct tandem pump assembly without splitter gearboxes; supports multiple independent open-loop circuits on a single main electric drive motor. |
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