Piston pump
HENGYUHANG Axial Piston Variable Pump HYH4VG Series 32
Engineered with a heavy-duty swashplate axial piston rotary group for closed-circuit hydrostatic transmissions, the HENGYUHANG HYH4VG Series 32 variable pump delivers steplessly variable bi-directional flow, seamless passage through the neutral position, an integrated auxiliary boost pump, and a nominal continuous operating pressure of 400 bar with maximum peak pressure reaching 450 bar (6,525 psi / 45 MPa).
| Applications
Optimized for high-pressure closed-loop mobile traction drives and heavy industrial hydrostatic circuits, this variable axial piston pump powers wheel loaders, telehandlers, compaction rollers, mobile cranes, concrete mixer trucks, forestry equipment, and offshore winch drives. Featuring standardized SAE J744 2-bolt, 2+4-bolt, and 4-bolt mounting flanges, modular 100% full-torque SAE through-drives, and versatile hydraulic, mechanical, and electrohydraulic control devices (HD3, HW, DA, EP, EZ, ET, DG), it provides seamless 1:1 OEM drop-in interchangeability for Bosch Rexroth A4VG Series 32 pump installations.
| Key Technical Specifications
Product Model: Hengyuhang Axial Piston Variable Pump HYH4VG Series 32
Brand Replacement: Bosch Rexroth A4VG Series 32 (Sizes 28, 40, 56, 71, 90, 125, 180; closed circuit) OEM or as requested.
Displacement: 28 to 180 cm³/rev across 7 standardized sizes (HYH4VG 28, HYH4VG 40, HYH4VG 56, HYH4VG 71, HYH4VG 90, HYH4VG 125, HYH4VG 180)
Rotation Direction: Clockwise (R), counter-clockwise (L) (viewed from drive shaft end)
Speed Range: Nominal rated speed 2,500 to 4,250 r/min (Maximum speed 2,900 to 4,500 r/min; intermittent speed up to 3,000 to 5,000 r/min; minimum speed 500 r/min)
Peak Pressure: Nominal continuous working pressure 400 bar (5,800 psi); Maximum peak pressure 450 bar (6,525 psi / 45 MPa)
- Description
- Tecspecs
- Brand & Reference
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| Overview of HENGYUHANG HYH4VG Series 32
The HENGYUHANG HYH4VG Series 32 is a high-pressure axial piston variable displacement pump engineered specifically for closed-circuit hydrostatic transmissions. Available across seven standardized frame sizes—HYH4VG 28, HYH4VG 40, HYH4VG 56, HYH4VG 71, HYH4VG 90, HYH4VG 125, and HYH4VG 180 cm³/rev—flow delivery is directly proportional to drive speed and pump displacement, steplessly regulated by adjusting the swashplate cradle angle. When the swashplate passes through the neutral center position, the direction of fluid delivery reverses smoothly and progressively, enabling seamless machine forward/reverse travel or bi-directional motor operation without external directional control valves.
Constructed with high-strength ductile iron housings, hydrostatically balanced slipper-pad retaining mechanisms, and heavy-duty rotary group bearings, the HYH4VG Series 32 is rated for 400 bar continuous working pressure and 450 bar peak pressure. Each unit incorporates an integrated auxiliary gear boost pump that supplies replenishing fluid and pilot pressure, dual high-pressure cross-port relief valves with integrated boost make-up check functions, an integrated boost-pressure relief valve, and an adjustable pressure cut-off mechanism as standard. Standardized with SAE J744 mounting flanges, SAE J518 metric-threaded working ports, ANSI B92.1a / DIN 5480 splined shafts, and full-torque through-drives, the HYH4VG Series 32 delivers complete 1:1 mechanical and hydraulic drop-in interchangeability for Bosch Rexroth A4VG Series 32 pumps.
| Dimension of HENGYUHANG HYH4VG Series 32
| Interface Data Needed with the Drawing Across the 7 Models
| Model / Size (HYH4VG) | Mounting Flange (SAE J744) | Drive Shaft Options | Working Ports A, B (SAE J518, 450 bar) | Suction Port S (Boost Pump, 5 bar) | Case Drain Ports T1, T2 (DIN 3852, 3 bar) | Stroking & Control Ports X1–X4 (40 bar) | Boost Ports Fa, Fe (40 bar) | Gauge Ports MA, MB (450 bar) |
|---|---|---|---|---|---|---|---|---|
| HYH4VG 28 | SAE 101-2 (B), 2-bolt | 1. Splined S: ANSI B92.1a; 2. Splined Z: DIN 5480 | SAE 3/4 in, 4-M10 × 1.5 depth 17 mm | M33 × 2 depth 18 mm | M22 × 1.5 depth 14 mm | M12 × 1.5 depth 12 mm | M18 × 1.5 depth 12 mm | M12 × 1.5 depth 12 mm |
| HYH4VG 40 | SAE 127-2 (C), 2-bolt | 1. Splined S: ANSI B92.1a; 2. Splined Z: DIN 5480 | SAE 3/4 in, 4-M10 × 1.5 depth 17 mm | M33 × 2 depth 18 mm | M22 × 1.5 depth 14 mm | M12 × 1.5 depth 12 mm | M18 × 1.5 depth 12 mm | M12 × 1.5 depth 12 mm |
| HYH4VG 56 | SAE 127-2 (C), 2-bolt | 1. Splined S: 1-1/4 in 14T 12/24 DP; 2. Splined T: 1-3/8 in 21T 16/32 DP; 3. Splined Z: DIN 5480 | SAE 3/4 in, 4-M10 × 1.5 depth 17 mm | M33 × 2 depth 18 mm | M22 × 1.5 depth 14 mm | M12 × 1.5 depth 12 mm | M18 × 1.5 depth 14.5 mm | M12 × 1.5 depth 12 mm |
| HYH4VG 71 | SAE 127-2/4 (C), 2+4-bolt | 1. Splined S: 1-1/4 in 14T 12/24 DP; 2. Splined T: 1-3/8 in 21T 16/32 DP; 3. Splined Z: DIN 5480 | SAE 3/4 in, 4-M12 × 1.75 depth 17 mm | M33 × 2 depth 18 mm | M26 × 1.5 depth 16 mm | M16 × 1.5 depth 12 mm | M22 × 1.5 depth 14 mm | M12 × 1.5 depth 12 mm |
| HYH4VG 90 | SAE 127-2/4 (C), 2+4-bolt | 1. Splined S: ANSI B92.1a; 2. Splined Z: DIN 5480 | SAE 1 in, 4-M12 × 1.75 depth 17 mm | M42 × 2 depth 20 mm | M26 × 1.5 depth 16 mm | M16 × 1.5 depth 12 mm | M26 × 1.5 depth 16 mm | M12 × 1.5 depth 12 mm |
| HYH4VG 125 | SAE 152-2/4 (D), 2+4-bolt | 1. Splined S: ANSI B92.1a; 2. Splined Z: DIN 5480 | SAE 1-1/4 in, 4-M14 × 2.0 depth 19 mm | M48 × 2 depth 22 mm | M33 × 2 depth 18 mm | M16 × 1.5 depth 12 mm | M33 × 2 depth 18 mm | M12 × 1.5 depth 12 mm |
| HYH4VG 180 | SAE 165-4 (E), 4-bolt | 1. Splined S: ANSI B92.1a; 2. Splined Z: DIN 5480 | SAE 1-1/4 in, 4-M14 × 2.0 depth 19 mm | M48 × 2 depth 22 mm | M42 × 2 depth 20 mm | M16 × 1.5 depth 12 mm | M33 × 2 depth 18 mm | M12 × 1.5 depth 12 mm |
Note: Depending on installation orientation, drain port T1 or T2 must be piped directly to tank below minimum fluid level. Drive shaft coupling requires flexible element.
| Pump Installation Specifications HENGYUHANG HYH4VG Series 32
| Comprehensive Ordering Code Structure (Aligned with RE-P 92003 Series 32)
Code structure — reference: HYH4VG−Size−Control/32−Rotation−Seals−Shaft−Flange−PortPlate−ThroughDrive−HPRelief−Filtration
| Position | Code Element | Description & Selection Options |
|---|---|---|
| 01 | Axial Piston Unit | HYH4V = Swashplate axial piston variable pump, nominal pressure 400 bar, peak pressure 450 bar |
| 02 | Operating Mode | G = Closed circuit pump (Pumpe, geschlossener Kreislauf) |
| 03 | Displacement Size (HYH4VG) | 028, 040, 056, 071, 090, 125, 180 cm³/rev |
| 04 | Control Device | HD3 = Hydraulic pilot control, pilot pressure proportional; HW = Mechanical servo control, lever operated; DA1 / DA2 = Automatic speed-related control (12 V / 24 V DC); DG = Hydraulic control, direct operated; EP3 / EP4 = Electrohydraulic proportional control (12 V / 24 V DC); EZ1 / EZ2 = Electrohydraulic two-point control (12 V / 24 V DC); ETA / ETB = Electronic control BODAS-compatible (12 V / 24 V DC); ET3 / ET4 = Proportional control with FTDRE valve (12 V / 24 V DC); ET7 / ET8 = Proportional control with DRE5 valve (12 V / 24 V DC) |
| 05 | Pressure Cut-Off | Without code = Without pressure cut-off; D = With pressure cut-off (standard on sizes 28, 40, 56, 90, 125, 180; not on size 71) |
| 06 | Neutral Position Switch | Without code = Without neutral switch; L = With neutral position switch (for HW control only) |
| 07 | Mechanical Stroke Limiter | Without code = Without mechanical limiter; M = With externally adjustable mechanical stroke limiter |
| 08 | Stroking Chamber Pressure Port | Without code = Standard; T = Ports X3, X4 provided for external stroking chamber measurement |
| 09 | DA Control Valve Variants | 1, 2, 3R, 3L, 7, 8 (flow direction and pilot valve options) |
| 10 | Series | 32 = Series 3, Index 2 (Baureihe 32) |
| 11 | Direction of Rotation | R = Clockwise; L = Counter-clockwise (viewed from drive shaft end) |
| 12 | Sealing Material | N = NBR (nitrile rubber seals with FKM high-performance shaft seal) |
| 13 | Drive Shaft | Z = Involute splined shaft DIN 5480 (single pump); A = Involute splined shaft DIN 5480 (combination 1st pump); S = Involute splined shaft ANSI B92.1a (single pump); T = Involute splined shaft ANSI B92.1a (combination 1st pump); U = Splined shaft for combination 2nd pump |
| 14 | Mounting Flange | C = SAE J744 2-bolt flange (sizes 28, 40, 56); F = SAE J744 2+4-bolt flange (sizes 71, 90, 125); D = SAE J744 4-bolt flange (size 180) |
| 15 / 16 | Port Plates & Ports | 02 = Metric profile seal DIN 3852, ports A & B bottom, suction S bottom; 03 = Metric profile seal DIN 3852, ports A & B top, suction S bottom; 10 = Metric profile seal DIN 3852, ports A & B same side right, suction S bottom; 13 = Metric profile seal DIN 3852, ports A & B same side left, suction S bottom; 22 = Metric O-ring seal ISO 6149, ports A & B bottom, suction S bottom; 30 = Metric O-ring seal ISO 6149, ports A & B top, suction S bottom |
| 17 | Through-Drive | 00 = Without through-drive (sealed rear cover); 01 = SAE A (82-2) hub 5/8 in 9T 16/32 DP; 52 = SAE A (82-2) hub 3/4 in 11T 16/32 DP; 02 = SAE B (101-2) hub 7/8 in 13T 16/32 DP; 04 = SAE B (101-2) hub 1 in 15T 16/32 DP; 09 = SAE C (127-2) hub 1 in 15T 16/32 DP; 07 = SAE C (127-2) hub 1-1/4 in 14T 12/24 DP; 73 = SAE D (152-2/4) hub DIN 5480 W35×2×30×16×9g; 69 = SAE D (152-2/4) hub 1-3/4 in 13T 8/16 DP; 72 = SAE E (165-4) hub 1-3/4 in 13T 8/16 DP |
| 18 | High-Pressure Relief Valve | 1 = Pilot operated 100 to 420 bar with bypass (sizes 71, 90, 125, 180); 3 = Direct operated 250 to 420 bar without bypass (sizes 28, 40, 56); 5 = Direct operated 250 to 420 bar with bypass (sizes 28, 40, 56); 4 = Direct operated 100 to 250 bar without bypass (sizes 28, 40, 56); 6 = Direct operated 100 to 250 bar with bypass (sizes 28, 40, 56) |
| 19 | Filtration Option | S = Filtration in boost pump suction line (external filter); D = Filtration in boost pump pressure line (cold-start port); F = Attachment filter with integrated cold-start valve; P = Attachment filter with visual contamination indicator; B = Attachment filter with electrical contamination indicator; E = External boost pressure supply (without integrated boost pump) |
| 20 | Swivel Angle Sensor | Without code = Without sensor; R = Electric swivel angle sensor (on request) |
| 21 | Electrical Connector | Without code = Hydraulic/mechanical control (no solenoid); P = DEUTSCH 2-pin molded connector without suppressor diode; Q = DEUTSCH 2-pin molded connector with suppressor diode |
| 22 | Special Execution | Without code = Standard production execution; -S = Special execution (customized paint, special port threads, or validation certification) |
| Reading Your Replacement Code
| Target Bosch Rexroth Part Code | HENGYUHANG HYH Equivalent | Interchange Verification Notes |
|---|---|---|
| A4VG28EP4D1/32R-NZC02F001SP | HYH4VG-028-EP4D1/32-R-N-Z-C-02-F00-1-S-P | Direct 1:1 drop-in: HYH4VG 28, 24V EP proportional electric control with pressure cut-off D, Series 32, DIN 5480 splined shaft, SAE B flange, bottom ports |
| A4VG40HD3D1/32R-NSC02F003S | HYH4VG-040-HD3D1/32-R-N-S-C-02-F00-3-S | Direct 1:1 drop-in: HYH4VG 40, HD3 hydraulic pilot control with pressure cut-off, ANSI splined shaft, SAE C 2-bolt flange, suction filtration S |
| A4VG56EP4D1/32R-NSC02F021SP | HYH4VG-056-EP4D1/32-R-N-S-C-02-F02-1-S-P | Direct 1:1 drop-in: HYH4VG 56, EP4 24V electric control, ANSI splined shaft S, SAE B through-drive (F02), Deutsch 2-pin connector |
| A4VG71HD31/32R-NZF02F001S | HYH4VG-071-HD31/32-R-N-Z-F-02-F00-1-S | Direct 1:1 drop-in: HYH4VG 71, HD3 pilot control, Series 32, DIN 5480 splined shaft, SAE 2+4-bolt flange F, HP relief valve with bypass |
| A4VG90EP4D1/32R-NZF02F041SP | HYH4VG-090-EP4D1/32-R-N-Z-F-02-F04-1-S-P | Direct 1:1 drop-in: HYH4VG 90, EP4 24V electric control with D cut-off, DIN shaft, SAE B 15T through-drive (F04), 400 bar closed-loop drive |
| A4VG125HD3D1/32R-NSF02F071S | HYH4VG-125-HD3D1/32-R-N-S-F-02-F07-1-S | Direct 1:1 drop-in: HYH4VG 125, HD3 hydraulic pilot control, SAE 1-1/4 in main ports, SAE C through-drive (F07), 400/450 bar traction pump |
| A4VG180EP4D1/32R-NSD02F001SP | HYH4VG-180-EP4D1/32-R-N-S-D-02-F00-1-S-P | Direct 1:1 drop-in: HYH4VG 180, EP4 electric control with D cut-off, SAE 4-bolt flange D, SAE 1-1/4 in working ports, 300 kW drive capacity |
| Techspecs of HENGYUHANG HYH4VG Series 32
| 4.1 Technical Data Across the 7 Frame Sizes (Aligned with RE-P 92003)
| Parameter / Technical Specification | Symbol | Unit | HYH4VG 28 | HYH4VG 40 | HYH4VG 56 | HYH4VG 71 | HYH4VG 90 | HYH4VG 125 | HYH4VG 180 |
|---|---|---|---|---|---|---|---|---|---|
| Geometric Displacement per rev | Vg max | cm³ | 28 | 40 | 56 | 71 | 90 | 125 | 180 |
| Integrated Boost Pump Displacement | VgSp | cm³ | 6.1 | 8.6 | 11.6 | 19.6 | 19.6 | 28.3 | 39.8 |
| Nominal Rated Speed (at Vg max, ν opt) | n nom | r/min | 4,250 | 4,000 | 3,600 | 3,300 | 3,050 | 2,850 | 2,500 |
| Maximum Permissible Speed (at p ≤ p nom) | n max1 | r/min | 4,500 | 4,200 | 3,900 | 3,600 | 3,300 | 3,250 | 2,900 |
| Intermittent Speed Limit (at Δp = 70…150 bar) | n max2 | r/min | 5,000 | 5,000 | 4,500 | 4,100 | 3,800 | 3,450 | 3,000 |
| Minimum Drive Speed | n min | r/min | 500 | 500 | 500 | 500 | 500 | 500 | 500 |
| Max. Flow Delivery (at n nom, Vg max) | qv | l/min | 119 | 160 | 202 | 234 | 275 | 356 | 450 |
| Nominal Continuous Working Pressure | p nom | bar | 400 | 400 | 400 | 400 | 400 | 400 | 400 |
| Maximum Peak Operating Pressure | p max | bar | 450 | 450 | 450 | 450 | 450 | 450 | 450 |
| Drive Power at n nom and Δp = 400 bar | P | kW | 79 | 107 | 134 | 156 | 183 | 238 | 300 |
| Drive Torque at Δp = 400 bar | M | N·m | 178 | 255 | 357 | 452 | 573 | 796 | 1,146 |
| Drive Torque at Δp = 100 bar | M | N·m | 45 | 64 | 89 | 113 | 143 | 199 | 286 |
| Rotary Group Moment of Inertia | J TW | kg·m² | 0.0022 | 0.0038 | 0.0066 | 0.0097 | 0.0149 | 0.0232 | 0.0444 |
| Maximum Angular Acceleration | α | rad/s² | 38,000 | 30,000 | 24,000 | 21,000 | 18,000 | 14,000 | 11,000 |
| Case Fluid Filling Volume | V | l | 0.9 | 1.1 | 1.5 | 1.3 | 1.5 | 2.1 | 3.1 |
| Pump Weight (approximate) | m | kg | 29 | 31 | 38 | 50 | 60 | 80 | 101 |
Note: Technical values valid for optimal viscosity range ν opt = 16…36 mm²/s using ISO VG 46 mineral hydraulic fluid.
| 4.2 Operating Pressure & Filtration Parameters (Aligned with RE-P 92003)
| Parameter | Value & Permissible Limit | Engineering Operating Conditions |
|---|---|---|
| Nominal Pressure (p nom) | 400 bar (5,800 psi / 40 MPa) | Continuous high-pressure working duty across ports A and B |
| Maximum Pressure (p max) | 450 bar (6,525 psi / 45 MPa) | Peak pressure limit; single operating period ≤ 10 s, total cumulative life ≤ 300 h |
| Low-Pressure Side (Boost Circuit) | Minimum p min ≥ 10 bar above case pressure | Ensures hydrostatic slipper contact and prevents cavitation in closed loop |
| Rate of Pressure Change (R A) | Maximum 9,000 bar/s | Maximum allowable pressure gradient across working ports during dynamic reversal |
| Boost Pump Pressure (p Sp) | Nominal 25 bar; Maximum 40 bar | Regulated by internal boost-pressure relief valve |
| Suction Pressure (Port S) | Continuous p S min ≥ 0.8 bar abs; Cold start ≥ 0.5 bar abs | Maximum permissible suction pressure p S max ≤ 5 bar abs |
| Case Drain Pressure (Ports T1, T2) | Continuous p T max ≤ 3 bar abs; Cold start ≤ 5 bar abs | Unrestricted direct piping to reservoir below minimum fluid level required |
| 4.3 Hydraulic Fluid & Temperature Limits
| Parameter | Permissible Operating Limits | Optimal Target Range |
|---|---|---|
| Permissible Hydraulic Fluid | Mineral oil HLP according to DIN 51524 | High-grade anti-wear mineral hydraulic oil |
| Operating Viscosity (Continuous) | ν = 10 to 400 mm²/s (cSt) | ν opt = 16 to 36 mm²/s (cSt) |
| Cold Start Viscosity Limit | ν max ≤ 1,600 mm²/s (t ≤ 3 min, p ≤ 50 bar, n ≤ 1,000 r/min) | System warm-up cycle recommended |
| Short-Term Viscosity Limit | ν min = 7 to 10 mm²/s (t ≤ 3 min, p ≤ 0.3×p nom) | Measured at case drain port T |
| Operating Temperature Range | NBR seals: −40 °C to +85 °C; FKM shaft seal: −25 °C to +110 °C | +30 °C to +65 °C (+86 °F to +149 °F) |
| Maximum Circuit Temperature | +115 °C (+239 °F) at working ports A and B | Maximum temperature difference pump-to-fluid ΔT ≤ 25 K |
| Required Fluid Cleanliness | ISO 4406 Class 20/18/15 (NAS 1638 Class 9) | ISO 4406 Class 19/17/14 when operating at ν < 10 mm²/s |
Advantages
Heavy-Duty 400/450 bar Swashplate Closed-Circuit Architecture
Engineered with high-strength spheroidal graphite cast iron housings, reinforced swashplate cradles, and micro-finished bronze-faced cylinder blocks, sustaining 400 bar continuous and 450 bar peak pressures under punishing mobile duty cycles.
Progressive Flow Reversal Through Neutral Position
Infinitely variable bi-directional fluid delivery seamlessly transitions through zero without pressure shocks or flow interruption, enabling smooth direction changes in hydrostatic vehicle drives and winch winching/lowering operations.
Integrated Auxiliary Boost Pump with Complete Filtration Versatility
Built-in internal gerotor/gear boost pump delivers constant replenishing flow and pilot pressure, supporting external suction filtration (S), pressure line filtration (D), or compact integrated attachment filters (F/P/B) with visual and electric contamination indicators.
Cross-Port High-Pressure Relief Valves with Integrated Boost Function
Factory-calibrated high-pressure relief valves (100–420 bar) safeguard hydraulic lines against peak shock pressures while instantly providing anti-cavitation boost make-up oil to the low-pressure side.
Comprehensive Modular Hydraulic & Electrohydraulic Controls
Adaptable to diverse system architectures via interchangeable control modules, including hydraulic pilot control (HD3), mechanical servo control (HW), automotive speed-sensing control (DA), and proportional electric solenoid control (EP3/EP4, EZ, ET) compatible with 12V/24V microcontrollers and BODAS mobile controllers.
100% Full-Torque Universal SAE Through-Drive Capability
Robust auxiliary through-drive shafts allow 100% of the rated drive torque to be transmitted to secondary tandem pumps (SAE A, B, C, D, E auxiliary gear, vane, or piston pumps), creating ultra-compact multi-circuit hydraulic drive units.
Reference
Displacement & Control Configuration Matrix
Models Available: HYH4VG 28, HYH4VG 40, HYH4VG 56, HYH4VG 71, HYH4VG 90, HYH4VG 125, HYH4VG 180 (displacements 28 to 180 cm³/rev).
Control Architectures Available:
HD3: Proportional hydraulic pilot pressure control for heavy construction machines.
HW: Mechanical servo lever control with optional neutral position interlock switch (L).
DA1 / DA2: Automotive speed-related control for hydrostatic vehicle traction drives.
EP3 / EP4: 12V / 24V DC proportional electric solenoid control with linear characteristic curve.
EZ1 / EZ2: 12V / 24V DC two-point electric switching control for on/off dual-speed systems.
ETA / ETB / ET3 / ET4: Advanced proportional electronic control for CAN-bus automated machines.
Mounting Standards: SAE J744 2-bolt, 2+4-bolt, and 4-bolt flanges with ANSI B92.1a and DIN 5480 splined shafts.
Target Brand Interchangeability Matrix
The HENGYUHANG HYH4VG Series 32 delivers verified 1:1 drop-in replacement across the complete Bosch Rexroth A4VG Series 32 portfolio:
Bosch Rexroth A4VG28 Series 32 → HYH4VG-028/32 (all control, shaft, flange, and port variants)
Bosch Rexroth A4VG40 Series 32 → HYH4VG-040/32 (all control, shaft, flange, and port variants)
Bosch Rexroth A4VG56 Series 32 → HYH4VG-056/32 (all control, shaft, flange, and port variants)
Bosch Rexroth A4VG71 Series 32 → HYH4VG-071/32 (all control, shaft, flange, and port variants)
Bosch Rexroth A4VG90 Series 32 → HYH4VG-090/32 (all control, shaft, flange, and port variants)
Bosch Rexroth A4VG125 Series 32 → HYH4VG-125/32 (all control, shaft, flange, and port variants)
Bosch Rexroth A4VG180 Series 32 → HYH4VG-180/32 (all control, shaft, flange, and port variants)
Brand Replacement
The HENGYUHANG HYH4VG Series 32 is engineered as a high-precision, direct 1:1 drop-in replacement for the Bosch Rexroth A4VG Series 32 closed-circuit axial piston variable pump family. Manufactured in accordance with rigorous ISO 9001 quality management standards, each pump is dynamically validated on computerized high-pressure test benches to match Rexroth factory performance curves across swashplate response time, control hysteresis, boost pressure regulation, cross-port relief calibration, and overall volumetric efficiency (>92%).
Utilizing standardized SAE J744 mounting spigots, identical shaft overhang dimensions, standardized SAE J518 metric-threaded working port flanges, and matching control port thread locations, HYH4VG Series 32 pumps drop directly into existing machine engine compartments and mobile chassis without modifying bell housings, drive couplings, hydraulic hose routing, or electronic control software. Fleet operators, heavy equipment manufacturers (OEMs), and hydraulic repair specialists achieve seamless interchangeability, drastically reduced procurement lead times, and substantial cost savings.
Applications
Construction & Earthmoving Machinery: Closed-circuit hydrostatic traction drives for wheeled and crawler excavators, compact wheel loaders, skid-steer loaders, and telescopic handlers.
Road Building & Compaction Equipment: Bi-directional hydrostatic propulsion and vibratory drum drives for tandem asphalt rollers, single-drum soil compactors, and cold planers.
Mobile Cranes & Material Handling: Heavy-duty closed-loop hydrostatic winch drives, boom extension mechanisms, and slewing drives for rough-terrain, all-terrain, and truck-mounted cranes.
Agricultural & Forestry Vehicles: Main traction hydrostatic drives for combine harvesters, self-propelled forage harvesters, agricultural tractors, forwarders, and tree feller bunchers.
Specialized Commercial Vehicles: Drum drive systems for transit concrete mixers, road sweepers, aircraft ground support pushback tractors, and rail maintenance vehicles.
Marine & Offshore Hydraulic Systems: Closed-loop hydraulic winch drives, mooring winches, anchor windlasses, and offshore crane auxiliary drives requiring 400 bar continuous power.
Package & Shipping
| Packaging Construction | Heavy-duty export fumigation-free wooden crate 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. 480 × 340 × 320 mm (HYH4VG 28/40/56) up to 780 × 460 × 440 mm (HYH4VG 125/180) |
| Gross Weight | Approx. 35 kg (HYH4VG 28) up to 112 kg (HYH4VG 180) |
| Standard Lead Time | 3 – 5 business days for standard stocked configurations; 15 – 25 business days for custom OEM production runs |
| Global Shipping Options | Express air courier (DHL / FedEx / UPS / TNT) for emergency maintenance; Ocean FCL/LCL and Air freight for volume orders |
| Custom Documentation | Certificate of conformity, computerized dynamic test bench reports, 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 (Bosch 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 HYH4VG Series 32 (Heavy-Duty Swashplate Design Closed-Circuit Hydraulic Pump, 28.00~180.00 cm³/rev) is a high-pressure, bi-directional swashplate-design axial piston variable displacement pump engineered specifically for closed-circuit hydrostatic transmissions in severe-duty mobile machinery, commercial utility vehicles, and heavy construction equipment. Manufactured as a dedicated custom replacement benchmarked directly against the global industry standard Bosch Rexroth A4VG Series 32 (covering frame sizes A4VG 28, A4VG 40, A4VG 56, A4VG 71, A4VG 90, A4VG 125, and A4VG 180), the HYH4VG Series 32 features a variable displacement swashplate rotary group with integrated auxiliary boost pump (charge pump) and integrated pilot oil supply. Flow direction reverses smoothly and steplessly as the swashplate moves through the neutral center position, with flow volume directly proportional to drive speed and swashplate displacement angle. Engineered for heavy hydrostatic propel and winch drives, the pump operates at a continuous nominal pressure (p_nom) of 400 bar (5,800 psi / 40 MPa) and a maximum peak pressure (p_max) of 450 bar (6,525 psi / 45 MPa), spanning 7 standardized displacement sizes from 28.0 to 180.0 cm³/rev (1.71 to 10.98 in³/rev). Designed with standard SAE J744 mounting flanges (SAE B, SAE C, SAE D, and SAE E), robust ANSI B92.1a involute splined drive shafts, SAE J518 Code 62 high-pressure ports (3/4 in to 1 1/4 in), comprehensive through-drive capabilities for secondary tandem pump mounting, dual high-pressure relief valves with integrated boost makeup function, and a full modular portfolio of pilot-pressure, mechanical-servo, and electro-proportional controllers (EP, HD, HW, DA, DG, EZ, ET, and pressure cut-off D), the HYH4VG Series 32 offers an exact custom-tailored replacement solution for high-duty closed-loop hydrostatic drives.
| Applications
The HYH4VG Series 32 closed-circuit axial piston variable pump is designed for high-pressure hydrostatic drive transmissions operating under continuous heavy cyclic loads and frequent directional reversals:
Construction & Earthmoving Machinery Traction Drives: Powers closed-loop hydrostatic travel drives on crawler excavators, compact track loaders, wheel loaders, telescopic handlers, and backhoe loaders operating at continuous 400 bar system pressure.
Road Construction & Paving Equipment: Drives single and tandem vibratory soil compactors, asphalt rollers, road cold planers, and slipform pavers requiring smooth, jerk-free acceleration and precise low-speed creep control.
Agricultural Combines & Self-Propelled Harvesters: Delivers reliable ground drive propulsion and reel drive power for grain harvesters, forage harvesters, self-propelled sprayers, and forestry forwarders.
Heavy Mobile Cranes & Drilling Rigs: Supplies closed-loop hydraulic power to high-pressure main hoist winches, rotary drilling drive heads, and boom derricking winches with high-dynamic braking response.
Concrete Transit Mixers & Mobile Concrete Pumps: Drives mixer drum rotation circuits in both clockwise and counter-clockwise directions, ensuring continuous agitation and rapid discharge under full payload.
Mining & Tunneling Underground Vehicles: Operates in underground load-haul-dump (LHD) loaders, shotcrete spraying rigs, and shuttle cars requiring compact envelope dimensions and high peak pressure shock resistance up to 450 bar.
| Key Specifications Overview
| Parameter | Benchmark Engineering Specification (Rexroth A4VG Series 32 Target Standard) |
|---|---|
| Pump Architecture | Variable Swashplate Axial Piston Unit for Closed-Circuit Hydrostatic Transmissions (Series 32) |
| Standard Displacement Frame Sizes | 7 Standard Frame Sizes: HYH4VG 028, HYH4VG 040, HYH4VG 056, HYH4VG 071, HYH4VG 090, HYH4VG 125, HYH4VG 180 cm³/rev |
| Nominal Continuous Pressure (p_nom) | 400 bar (5,800 psi / 40 MPa) continuous design working pressure at service ports A and B |
| Maximum Peak Operating Pressure (p_max) | 450 bar (6,525 psi / 45 MPa) peak operating pressure (single period max 10 s, cumulative 300 h) |
| Maximum Rate of Pressure Change (RA_max) | 9,000 bar/s (130,500 psi/s) maximum permissible rate of pressure build-up and reduction |
| Integrated Boost Pump (Charge Pump) | Built-in gerotor/gear auxiliary boost pump (displacement 6.1 to 39.8 cm³/rev @ 20 bar) for replenishment and pilot feed |
| Boost Pressure Setting (p_Sp) | Nominal boost pressure: 20 ~ 30 bar above case drain pressure (factory standard setting: 20 bar / 290 psi) |
| Case Drain Pressure Limits (p_L max) | Maximum continuous case pressure: 3.0 bar (43.5 psi) absolute; Intermittent cold-start maximum: 5.0 bar (72.5 psi) absolute |
| Nominal Drive Speed Range (n_nom @ Vg_max) | 4250 rpm (028), 4000 rpm (040), 3600 rpm (056), 3300 rpm (071), 3050 rpm (090), 2850 rpm (125), 2500 rpm (180) |
| Intermittent Maximum Speed (n_max2) | Up to 5000 rpm (028/040), 4500 rpm (056), 4100 rpm (071), 3800 rpm (090), 3450 rpm (125), 3000 rpm (180) |
| Delivery Flow Range @ n_nom (qv @ Δp = 0 bar) | 119 L/min (028), 160 L/min (040), 202 L/min (056), 234 L/min (071), 275 L/min (090), 356 L/min (125), 450 L/min (180) |
| Drive Power Consumption @ 400 bar (n_nom) | 79 kW (028), 107 kW (040), 134 kW (056), 156 kW (071), 183 kW (090), 238 kW (125), 300 kW (180) |
| Drive Torque Output @ 400 bar (Δp = 400 bar) | 178 Nm (028), 255 Nm (040), 357 Nm (056), 452 Nm (071), 573 Nm (090), 796 Nm (125), 1146 Nm (180) |
| Mounting Flange Standards (SAE J744) | SAE B 2-bolt (028), SAE C 2-bolt (040/056), SAE C 2/4-bolt (071), SAE D 2/4-bolt (090/125), SAE E 4-bolt (180) |
| Drive Shaft Configurations | ANSI B92.1a involute splined shafts (Code S standard, Code T reinforced, Code A) or DIN 5480 splined shafts (Code Z) |
| Service Line Port Standard | SAE J518 Code 62 high-pressure flange ports (3/4 in, 1 in, 1 1/4 in) with metric DIN 13 fastening threads |
| High-Pressure Relief Valve Protection | Dual direct-operated high-pressure relief valves with integrated boost makeup check valves (setting 100 to 420 bar) |
| Pressure Cut-Off Protection (Option D) | Integrated pressure cut-off valve override that rapidly destrokes the swashplate to neutral at preset relief pressure |
| Modular Control Options | EP (Electrical Proportional 12/24V), HD (Hydraulic Pilot), HW (Manual Servo Lever), DA (Speed-Sensing), DG (Hydraulic Two-Point), EZ (Electric Two-Point) |
| Through-Drive Auxiliary Options | Full-torque rear through-drive adapters (SAE A, SAE B, SAE C, SAE D, SAE E) for mounting auxiliary gear or piston pumps |
| Fluid Temperature & Viscosity Limits | Operating temperature: -40°C to +115°C (NBR/FKM); Viscosity range: 16 to 36 mm²/s optimal (5 to 1600 mm²/s permissible limits) |
| Fluid Cleanliness Standard | ISO 4406 Class 20/18/15 minimum (Class 19/17/14 required for high-temperature or severe continuous-duty operation) |
| Technical Performance Matrix Across Available Sizes
| Model Code (Custom Replacement) | Displacement (cm³/rev) | Operating Pressure (bar / psi) | Rotational Speed (rpm) | Delivery Flow @ n_nom (L/min) | Drive Power @ 400 bar (kW) | Torque Output (Nm) | Pump Mass (kg, approx) | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Pump (Vg_max) | Boost (Vg_Sp) | Nominal (p_nom) | Peak (p_max) | Nominal (n_nom) | Max Intermittent | @ 400 bar | @ 100 bar | ||||
| HYH4VG 028 | 28.0 | 6.1 | 400 / 5,800 | 450 / 6,525 | 4250 | 5000 | 119.0 | 79.0 | 178 | 45 | 29.0 |
| HYH4VG 040 | 40.0 | 8.6 | 400 / 5,800 | 450 / 6,525 | 4000 | 5000 | 160.0 | 107.0 | 255 | 64 | 31.0 |
| HYH4VG 056 | 56.0 | 11.6 | 400 / 5,800 | 450 / 6,525 | 3600 | 4500 | 202.0 | 134.0 | 357 | 89 | 38.0 |
| HYH4VG 071 | 71.0 | 19.6 | 400 / 5,800 | 450 / 6,525 | 3300 | 4100 | 234.0 | 156.0 | 452 | 113 | 50.0 |
| HYH4VG 090 | 90.0 | 19.6 | 400 / 5,800 | 450 / 6,525 | 3050 | 3800 | 275.0 | 183.0 | 573 | 143 | 60.0 |
| HYH4VG 125 | 125.0 | 28.3 | 400 / 5,800 | 450 / 6,525 | 2850 | 3450 | 356.0 | 238.0 | 796 | 199 | 80.0 |
| HYH4VG 180 | 180.0 | 39.8 | 400 / 5,800 | 450 / 6,525 | 2500 | 3000 | 450.0 | 300.0 | 1146 | 286 | 101.0 |
| Modular Control Devices and Operating Principles
| Control Code | Control Mechanism | Operating Parameters & Input | Functional Dynamics & Vehicle Control Benefit |
|---|---|---|---|
| EP3 / EP4 | Electrical Proportional Control (with Proportional Solenoid) | Control voltage: EP3 (12 V DC) / EP4 (24 V DC); PWM current: 400 ~ 1200 mA (12V) / 200 ~ 600 mA (24V) | Stepless, electronic displacement and direction control via joystick or vehicle ECU. Swashplate tilt angle is directly proportional to solenoid input current. Includes internal mechanical stroke feedback. |
| HD3 | Hydraulic Proportional Control (Pilot-Pressure-Related) | Pilot pressure range: p_St = 6 to 18 bar (87 to 261 psi) applied at ports Y1 and Y2 | Displacement and direction are steplessly controlled in direct proportion to hydraulic pilot pressure. Widely used in crane winch drives and mining hydraulic joysticks. |
| HW | Hydraulic-Mechanical Servo Control with Position Lever | Mechanical actuation angle: ±29° maximum lever deflection; Lever operating force: approx. 15 ~ 30 N | Direct manual linkage control for road roller travel and transit mixer drum rotation. The internal hydraulic servo amplifier ensures effortless lever operation regardless of high system working pressure. |
| DA1 / DA2 | Automatic Speed-Related Hydrostatic Travel Control | Control voltage: DA1 (12 V DC) / DA2 (24 V DC); Dependent on prime mover combustion engine rpm | Automotive drive characteristics for wheel loaders and telehandlers. Automatically matches pump displacement and tractive effort to diesel engine speed, preventing engine stalling. |
| EZ1 / EZ2 | Electrical Two-Point Switching Control (On/Off Solenoids) | Control voltage: EZ1 (12 V DC) / EZ2 (24 V DC); Solenoid type: switching on/off with Hirschmann or DEUTSCH | Two-point directional control between Vg_0 and +Vg_max or -Vg_max. Ideal for stationary bi-directional drives, conveyor drives, and indexing tables. |
| Pressure Cut-Off (D) | Integrated High-Pressure Cut-Off Valve Override | Setting range: 150 to 420 bar; Standard factory setting matched to high-pressure relief valves | Rapidly swivels the pump back to neutral (Vg_0) when system pressure reaches the preset limit, minimizing heat generation and saving fuel without blowing high-pressure relief valves. |
| Mounting Flange, Shaft and Port Specifications
| Model Size | Mounting Flange (SAE J744 Standard) | Drive Shaft (ANSI B92.1a / DIN 5480) | High-Pressure & Auxiliary Ports (SAE J518 / DIN 3852) |
|---|---|---|---|
| HYH4VG 028 | SAE J744 101-2 (SAE B 2-bolt); Centering pilot Ø101.6 mm (-0.054 mm); 2 × Ø14.3 mm holes; 146 mm bolt centers | Splined S: ANSI B92.1a 7/8 in 13T 16/32DP; Splined Z: DIN 5480 W25 × 1.25 × 18 × 9g | Ports A, B: SAE J518 Code 62 3/4 in (M10 × 1.5, 17 deep, 450 bar max); Suction S: M33 × 2; Drain T1/T2: M22 × 1.5; Boost Fa: M18 × 1.5 |
| HYH4VG 040 | SAE J744 127-2 (SAE C 2-bolt); Centering pilot Ø127.0 mm (-0.063 mm); 2 × Ø17.5 mm holes; 181 mm bolt centers | Splined S: ANSI B92.1a 1 in 15T 16/32DP; Splined A: 1 1/8 in 17T; Splined Z: DIN 5480 W30 × 2 × 14 × 9g | Ports A, B: SAE J518 Code 62 3/4 in (M10 × 1.5, 17 deep, 450 bar max); Suction S: M33 × 2; Drain T1/T2: M22 × 1.5; Boost Fa: M18 × 1.5 |
| HYH4VG 056 | SAE J744 127-2 (SAE C 2-bolt); Centering pilot Ø127.0 mm (-0.063 mm); 2 × Ø17.5 mm holes; 181 mm bolt centers | Splined S: ANSI B92.1a 1 1/4 in 14T 12/24DP; Splined T: 1 3/8 in 21T; Splined Z: DIN 5480 W35 × 2 × 16 × 9g | Ports A, B: SAE J518 Code 62 3/4 in (M10 × 1.5, 17 deep, 450 bar max); Suction S: M33 × 2; Drain T1/T2: M22 × 1.5; Boost Fa: M18 × 1.5 |
| HYH4VG 071 | SAE J744 127-2/4 (SAE C 2/4-bolt combo); Centering pilot Ø127.0 mm (-0.063 mm); 2/4 bolt mounting holes | Splined S: ANSI B92.1a 1 1/4 in 14T 12/24DP; Splined T: 1 3/8 in 21T; Splined Z: DIN 5480 W35 × 2 × 16 × 9g | Ports A, B: SAE J518 Code 62 1 in (M12 × 1.75, 20 deep, 450 bar max); Suction S: M42 × 2; Drain T1/T2: M26 × 1.5; Boost Fa: M26 × 1.5 |
| HYH4VG 090 | SAE J744 152-2/4 (SAE D 2/4-bolt combo); Centering pilot Ø152.4 mm (-0.063 mm); 2/4 bolt mounting holes | Splined S: ANSI B92.1a 1 1/2 in 23T 16/32DP; Splined U: 1 3/8 in 21T; Splined Z: DIN 5480 W40 × 2 × 18 × 9g | Ports A, B: SAE J518 Code 62 1 in (M12 × 1.75, 20 deep, 450 bar max); Suction S: M42 × 2; Drain T1/T2: M26 × 1.5; Boost Fa: M26 × 1.5 |
| HYH4VG 125 | SAE J744 152-2/4 (SAE D 2/4-bolt combo); Centering pilot Ø152.4 mm (-0.063 mm); 2/4 bolt mounting holes | Splined S: ANSI B92.1a 1 3/4 in 13T 8/16DP; Splined T: 2 in 15T; Splined Z: DIN 5480 W45 × 2 × 21 × 9g | Ports A, B: SAE J518 Code 62 1 1/4 in (M14 × 2, 19 deep, 450 bar max); Suction S: M48 × 2; Drain T1/T2: M33 × 2; Boost Fa: M33 × 2 |
| HYH4VG 180 | SAE J744 165-4 (SAE E 4-bolt); Centering pilot Ø165.1 mm (-0.063 mm); 4 × Ø21.5 mm holes; 224.5 mm centers | Splined S: ANSI B92.1a 1 3/4 in 13T 8/16DP; Splined T: 2 1/4 in 17T; Splined Z: DIN 5480 W50 × 2 × 24 × 9g | Ports A, B: SAE J518 Code 62 1 1/4 in (M14 × 2, 19 deep, 450 bar max); Suction S: M48 × 2; Drain T1/T2: M42 × 2; Boost Fa: M33 × 2 |
| Direct Interchangeability and OEM Replacement Matrix (Rexroth A4VG Series 32)
| Hengyuhang Series | OEM Target Model | OEM Reference Code | Custom Replacement & Field Compliance |
|---|---|---|---|
| HYH4VG 028 | Bosch Rexroth A4VG 28 Series 32 | A4VG 028 EP4D1 / 32R-NZF02F001S | Direct drop-in replacement for compact hydrostatic travel drives; identical SAE B 2-bolt flange, 7/8 in 13T splined shaft, SAE 3/4 in Code 62 ports, and 400 bar nominal rating. |
| HYH4VG 040 | Bosch Rexroth A4VG 40 Series 32 | A4VG 040 EP4D1 / 32R-NZC02F001S | Custom replacement for compact utility loaders and mini excavators; identical SAE C 2-bolt flange, 1 in 15T splined shaft, and 160 L/min flow rating @ 4000 rpm. |
| HYH4VG 056 | Bosch Rexroth A4VG 56 Series 32 | A4VG 056 EP4D1 / 32R-NZC02F001S | Direct replacement for road roller propulsion and vibratory drives; identical SAE C 2-bolt mounting, 1 1/4 in 14T splined shaft, and 202 L/min delivery @ 3600 rpm. |
| HYH4VG 071 | Bosch Rexroth A4VG 71 Series 32 | A4VG 071 EP4D1 / 32R-NZC02F001S | Full replacement for medium wheel loaders and agricultural harvesters; identical SAE C 2/4-bolt flange, 1 1/4 in splined shaft, SAE 1 in Code 62 ports, and 452 Nm torque @ 400 bar. |
| HYH4VG 090 | Bosch Rexroth A4VG 90 Series 32 | A4VG 090 EP4D1 / 32R-NZD02F001S | Heavy-duty replacement for mobile cranes and drilling rigs; features SAE D 2/4-bolt flange, 1 1/2 in 23T splined shaft, SAE 1 in Code 62 ports, and 275 L/min flow @ 3050 rpm. |
| HYH4VG 125 | Bosch Rexroth A4VG 125 Series 32 | A4VG 125 EP4D1 / 32R-NZD02F001S | High-capacity replacement for heavy earthmoving equipment; identical SAE D 2/4-bolt flange, 1 3/4 in 13T splined shaft, SAE 1 1/4 in Code 62 ports, and 796 Nm torque @ 400 bar. |
| HYH4VG 180 | Bosch Rexroth A4VG 180 Series 32 | A4VG 180 EP4D1 / 32R-NZE02F001S | Maximum-displacement closed-circuit replacement; features SAE E 4-bolt flange, 1 3/4 in 13T splined shaft, SAE 1 1/4 in Code 62 ports, and 300 kW continuous drive power @ 2500 rpm. |
| HYH4VG Through-Drive | Rexroth A4VG Through-Drive | Options 04, 07, 09, 14, 73, 75 | Full universal rear through-drives with SAE A, B, C, D, and E auxiliary mounting interfaces for driving secondary tandem pumps at 100% full input torque capacity. |
| Technical Performance Matrix Across Available Sizes
| Model Code (Custom Replacement) | Displacement (cm³/rev) | Operating Pressure (bar / psi) | Rotational Speed (rpm) | Delivery Flow @ n_nom (L/min) | Drive Power @ 400 bar (kW) | Torque Output (Nm) | Pump Mass (kg, approx) | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Pump (Vg_max) | Boost (Vg_Sp) | Nominal (p_nom) | Peak (p_max) | Nominal (n_nom) | Max Intermittent | @ 400 bar | @ 100 bar | ||||
| HYH4VG 028 | 28.0 | 6.1 | 400 / 5,800 | 450 / 6,525 | 4250 | 5000 | 119.0 | 79.0 | 178 | 45 | 29.0 |
| HYH4VG 040 | 40.0 | 8.6 | 400 / 5,800 | 450 / 6,525 | 4000 | 5000 | 160.0 | 107.0 | 255 | 64 | 31.0 |
| HYH4VG 056 | 56.0 | 11.6 | 400 / 5,800 | 450 / 6,525 | 3600 | 4500 | 202.0 | 134.0 | 357 | 89 | 38.0 |
| HYH4VG 071 | 71.0 | 19.6 | 400 / 5,800 | 450 / 6,525 | 3300 | 4100 | 234.0 | 156.0 | 452 | 113 | 50.0 |
| HYH4VG 090 | 90.0 | 19.6 | 400 / 5,800 | 450 / 6,525 | 3050 | 3800 | 275.0 | 183.0 | 573 | 143 | 60.0 |
| HYH4VG 125 | 125.0 | 28.3 | 400 / 5,800 | 450 / 6,525 | 2850 | 3450 | 356.0 | 238.0 | 796 | 199 | 80.0 |
| HYH4VG 180 | 180.0 | 39.8 | 400 / 5,800 | 450 / 6,525 | 2500 | 3000 | 450.0 | 300.0 | 1146 | 286 | 101.0 |
| Hengyuhang Series | OEM Target Model | OEM Reference Code | Custom Replacement & Field Compliance |
|---|---|---|---|
| HYH4VG 028 | Bosch Rexroth A4VG 28 Series 32 | A4VG 028 EP4D1 / 32R-NZF02F001S | Direct drop-in replacement for compact hydrostatic travel drives; identical SAE B 2-bolt flange, 7/8 in 13T splined shaft, SAE 3/4 in Code 62 ports, and 400 bar nominal rating. |
| HYH4VG 040 | Bosch Rexroth A4VG 40 Series 32 | A4VG 040 EP4D1 / 32R-NZC02F001S | Custom replacement for compact utility loaders and mini excavators; identical SAE C 2-bolt flange, 1 in 15T splined shaft, and 160 L/min flow rating @ 4000 rpm. |
| HYH4VG 056 | Bosch Rexroth A4VG 56 Series 32 | A4VG 056 EP4D1 / 32R-NZC02F001S | Direct replacement for road roller propulsion and vibratory drives; identical SAE C 2-bolt mounting, 1 1/4 in 14T splined shaft, and 202 L/min delivery @ 3600 rpm. |
| HYH4VG 071 | Bosch Rexroth A4VG 71 Series 32 | A4VG 071 EP4D1 / 32R-NZC02F001S | Full replacement for medium wheel loaders and agricultural harvesters; identical SAE C 2/4-bolt flange, 1 1/4 in splined shaft, SAE 1 in Code 62 ports, and 452 Nm torque @ 400 bar. |
| HYH4VG 090 | Bosch Rexroth A4VG 90 Series 32 | A4VG 090 EP4D1 / 32R-NZD02F001S | Heavy-duty replacement for mobile cranes and drilling rigs; features SAE D 2/4-bolt flange, 1 1/2 in 23T splined shaft, SAE 1 in Code 62 ports, and 275 L/min flow @ 3050 rpm. |
| HYH4VG 125 | Bosch Rexroth A4VG 125 Series 32 | A4VG 125 EP4D1 / 32R-NZD02F001S | High-capacity replacement for heavy earthmoving equipment; identical SAE D 2/4-bolt flange, 1 3/4 in 13T splined shaft, SAE 1 1/4 in Code 62 ports, and 796 Nm torque @ 400 bar. |
| HYH4VG 180 | Bosch Rexroth A4VG 180 Series 32 | A4VG 180 EP4D1 / 32R-NZE02F001S | Maximum-displacement closed-circuit replacement; features SAE E 4-bolt flange, 1 3/4 in 13T splined shaft, SAE 1 1/4 in Code 62 ports, and 300 kW continuous drive power @ 2500 rpm. |
| HYH4VG Through-Drive | Rexroth A4VG Through-Drive | Options 04, 07, 09, 14, 73, 75 | Full universal rear through-drives with SAE A, B, C, D, and E auxiliary mounting interfaces for driving secondary tandem pumps at 100% full input torque capacity. |
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