Piston Motors
HENGYUHANG Axial Piston Variable Motor HYH10VM Series 52
HENGYUHANG HYH10VM Series 52 is a high-speed swashplate axial piston variable displacement motor with standard 2-hole SAE mounting flange designed for open and closed hydrostatic circuits, delivering 280 bar nominal continuous pressure (350 bar peak), steplessly adjustable minimum displacement, bi-directional rotation, and seamless 1:1 drop-in interchangeability with Bosch Rexroth A10VM Series 52 motors.
| Applications
Engineered for high-performance hydrostatic auxiliary drives, winch systems, cutter head drives, tracked carrier propel drives, road sweeper brush drives, agricultural header drives, drill rig rotation heads, and marine deck machinery requiring standard SAE 2-bolt flange mounting and two-speed or variable displacement operation.
| Key Technical Specifications
Product Model: HYH10VM Series 52 (Sizes 28, 45, 63, 85)
Brand Replacement: Bosch Rexroth A10VM Series 52 (Sizes 28, 45, 63, 85), OEM or as requested.
Displacement: Maximum displacement Vg max = 28.0 cm³/rev (Size 28), 45.0 cm³/rev (Size 45), 62.0 cm³/rev (Size 63), 87.0 cm³/rev (Size 85); steplessly adjustable minimum displacement Vg min down to 8.0 / 12.0 / 16.0 / 22.0 cm³/rev
Rotation Direction: Bi-directional (W), viewed facing drive shaft (Port A to B: counter-clockwise; Port B to A: clockwise)
Speed Range: Rated speed at Vg max n nom 3,100–4,700 rpm; maximum permissible speed at Vg min n max perm 3,560–5,400 rpm (n min = 250 rpm continuous)
Peak Pressure: Nominal continuous operating pressure p nom = 280 bar (4,000 psi) / Maximum peak pressure p max = 350 bar (5,100 psi)
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| Overview of HENGYUHANG HYH10VM Series 52 Hydraulic Motors
The HENGYUHANG HYH10VM Series 52 is an advanced swashplate axial piston variable displacement hydraulic motor engineered for open and closed-circuit hydrostatic drive transmissions. Designed with standard 2-hole SAE mounting flanges (SAE B for sizes 28, 45, 63; SAE C for size 85), the HYH10VM serves as an exact 1:1 dimensional, physical, and functional drop-in replacement for the entire Bosch Rexroth A10VM Series 52 family across four standardized frame sizes spanning maximum geometric displacements from 28.0 cm³/rev up to 87.0 cm³/rev.
Motor output speed is directly proportional to inlet hydraulic flow rate and inversely proportional to instantaneous motor displacement; output torque increases proportionally to operating differential pressure between high and low-pressure ports and instantaneous displacement. Built around proven A10 rotary group technology with heavy-duty hydrostatic cradle bearings, bi-metal cylinder barrel tribology, and lightweight one-piece spherical slipper pistons, the motor is approved for high continuous drive speeds up to 5,400 rpm. With externally adjustable minimum displacement stops (Vgmin), bi-directional rotation, modular two-point hydraulic (HZ) and electrical (EZ) two-speed controls (12V/24V), optional integrated loop flushing and boost-pressure valves, and prepared speed-sensor ports, the HYH10VM delivers exceptional power density, robust reliability, and whisper-quiet operation across mobile machinery and industrial hydraulic drives.
| Dimension of HENGYUHANG HYH10VM Series 52 Hydraulic Motors
| Mechanical Installation Interface Specifications
| Frame Size (HYH10VM) | Mounting Flange Standard (ISO 3019-1 / SAE J744) | Drive Shaft Spline Options (ANSI B92.1a / ISO 3019-1) |
|---|---|---|
| HYH10VM28 | 2-Hole SAE 101-2 (B), Spigot Ø101.6 mm (-0.054 mm), 2-Bolt Hole Pattern | R: 7/8 in 13T 16/32DP (Usable Spline 25 mm, Center Thread 1/4-20 UNC-2B) |
| HYH10VM45 | 2-Hole SAE 101-2 (B), Spigot Ø101.6 mm (-0.054 mm), 2-Bolt Hole Pattern | R: 1 in 15T 16/32DP (Usable Spline 29.5 mm); W: 7/8 in 13T 16/32DP (Reduced Torque) |
| HYH10VM63 | 2-Hole SAE 101-2 (B), Spigot Ø101.6 mm (-0.054 mm), 2-Bolt Hole Pattern | R: 1 1/4 in 14T 12/24DP (Usable Spline 40 mm); W: 1 in 15T 16/32DP (Reduced Torque) |
| HYH10VM85 | 2-Hole SAE 127-2 (C), Spigot Ø127.0 mm (-0.063 mm), 2-Bolt Hole Pattern | R: 1 1/2 in 17T 12/24DP (Usable Spline 42 mm); W: 1 1/4 in 14T 12/24DP (Reduced Torque) |
| Frame Size (HYH10VM) | Working Line Ports A & B (Port Plate 10 / 11) | Threaded Working Ports A & B (Port Plate 16 / 66) | Case Drain Ports L & L1 (ISO 11926) | External Control Pressure Port G / G1 | Pilot Pressure Port X (HZ Control) | Speed Sensing Prepared Port |
|---|---|---|---|---|---|---|
| HYH10VM28 | Port Plate 10: SAE 3/4 in Lateral (M10×1.5, 17 deep; 350 bar) | Port Plate 16: M27×2 (16 deep; 350 bar); Port Plate 66: 1 1/16-12 UN-2B (20 deep) | 3/4-16 UNF-2B (15 deep; max 2 bar static, 4 bar peak) | 7/16-20 UNF-2B (12 deep; max 350 bar) | 7/16-20 UNF-2B (12 deep; max 350 bar) | Prepared for speed sensor (Port W) |
| HYH10VM45 | Port Plate 10: SAE 3/4 in Lateral; Port Plate 11: SAE 3/4 in Rear (M10×1.5, 17 deep) | Port Plate 16: M27×2 (16 deep; 350 bar); Port Plate 66: 1 1/16-12 UN-2B (20 deep) | 7/8-14 UNF-2B (17 deep; max 2 bar static, 4 bar peak) | 7/16-20 UNF-2B (12 deep; max 350 bar) | 7/16-20 UNF-2B (12 deep; max 350 bar) | Prepared for speed sensor (Port W) |
| HYH10VM63 | Port Plate 10: SAE 3/4 in Lateral (M10×1.5, 17 deep; 350 bar) | Port Plate 16: M27×2 (16 deep; 350 bar); Port Plate 66: 1 1/16-12 UN-2B (20 deep) | 7/8-14 UNF-2B (17 deep; max 2 bar static, 4 bar peak) | 7/16-20 UNF-2B (12 deep; max 350 bar) | 7/16-20 UNF-2B (12 deep; max 350 bar) | Prepared for speed sensor (Port W) |
| HYH10VM85 | Port Plate 10: SAE 1 in Lateral (M12×1.75, 17 deep; 350 bar) | Port Plate 60: SAE 1 in (7/16-14 UNC-2B, 22 deep; 350 bar) | 1 1/16-12 UN-2B (20 deep; max 2 bar static, 4 bar peak) | 7/16-20 UNF-2B (12 deep; max 350 bar) | 7/16-20 UNF-2B (10 deep; max 350 bar) | Prepared for speed sensor (Port W) |
| Interface Engineering Notes
Mounting Flange C: Standard 2-hole SAE flange execution (SAE B for sizes 28/45/63; SAE C for size 85) permits direct installation onto external gearboxes, pump drive splitters, winches, and machine structural brackets.
Drive Shaft Splines: Involute splines conforming to ANSI B92.1a (30° pressure angle, flat root, side fit, tolerance class 5) similar to ISO 3019-1.
Working Port Options: Port Plate 10 (lateral high-pressure SAE flange with metric DIN 13 threads), Port Plate 60 (lateral SAE flange with UNC threads), Port Plate 11/61 (rear high-pressure ports, size 45), Port Plate 16 (threaded M27×2 metric ports), and Port Plate 66 (threaded 1 1/16-12 UN ports).
Flushing Valve Option (Code 7): Integrated low-pressure flushing and circuit relief valve continuously drains hot fluid from the closed-circuit low-pressure side through the motor casing for heat dissipation.
| Installation Specifications
| Complete Ordering Code Structure
HYH10V−M−[Size]−[Control]/52 W−[Displacement Screw][Seal][Shaft][Flange][Ports][Valves][Sensor][Connector]
| Position | Code Segment | Available Designations & Options | Technical Description & Functional Purpose |
|---|---|---|---|
| 01 | Axial Piston Unit | HYH10V / A10V | Swashplate design, variable displacement, nominal pressure 280 bar, peak 350 bar |
| 02 | Operating Mode | M | Motor, standard mounting flange design for open and closed circuits |
| 03 | Geometric Frame Size | 28, 45, 63, 85 | Nominal maximum displacement in cm³/rev (28, 45, 62, 87 cm³/rev) |
| 04 | Control Devices | DG HZ / HZ6 EZ1 / EZ6 EZ2 / EZ7 | DG: Two-point control direct operated, external control pressure supply, without on/off valve HZ / HZ6: Hydraulic two-point control without (HZ) or with (HZ6) switching time orifice EZ1 / EZ6: Electric two-point control with switching solenoid, U = 12 V, without (EZ1) or with (EZ6) orifice EZ2 / EZ7: Electric two-point control with switching solenoid, U = 24 V, without (EZ2) or with (EZ7) orifice |
| 05 | Series | 52 | Series 5, Index 2 |
| 06 | Direction of Rotation | W | Bi-directional rotation, viewed facing drive shaft |
| 07 | Minimum Displacement | 1, 2 | 1: Vgmin steplessly adjustable range 1 (8–28 for 28; 12–25 for 45; 16–38 for 63; 22–50 for 85 cm³/rev) 2: Vgmin steplessly adjustable range 2 (26–45 for 45; 40–62 for 63; 48–85 for 85 cm³/rev) |
| 08 | Sealing Material | V | FKM (fluorocarbon rubber) dynamic and static seals |
| 09 | Drive Shaft Type | R, W | R: Involute splined shaft ANSI B92.1a for high torque W: Involute splined shaft ANSI B92.1a for reduced torque (Sizes 45, 63, 85) |
| 10 | Mounting Flange | C | Standard 2-hole flange based on ISO 3019-1 (SAE B for 28/45/63; SAE C for 85) |
| 11 | Working Line Ports | 10N00, 11N00, 16N00 | 10N00: Lateral opposite SAE flange ports, metric threads 11N00: Rear SAE 3/4" ports, metric threads (Size 45) 16N00: Lateral M27×2 metric threaded ports (Sizes 28, 45, 63) 60N00/61N00: Lateral/rear SAE ports with UNC threads 66N00: Lateral 1 1/16-12 UN threaded ports |
| 12 | Valves | 0, 7 | 0: Without valve block 7: Integrated flushing and boost-pressure valve (for working line ports 10, 16, 60, 66) |
| 13 | Speed Sensing | Blank | Without speed sensing (standard) |
| 14 | Connector for Solenoid | Blank / P | Blank: Without connector (hydraulic control) P: DEUTSCH molded 2-pin connector (DT04-2P), without suppressor diode |
| Reading Your Replacement Code
| Rexroth OEM Model Code | HENGYUHANG Drop-In Code | Displacement (Vgmax / Vgmin) | Control Execution | Drive Shaft & Mounting | Ports & Optional Valves |
|---|---|---|---|---|---|
| A10VM28EZ2/52W-V1RC10N000P | HYH10VM28EZ2/52W-V1RC10N000P | 28.0 cm³ / 8.0 cm³ | Electric 2-Position (24V DC EZ2) | Splined R (7/8" 13T), SAE B 2-Bolt | SAE 3/4" Lateral Metric, DEUTSCH |
| A10VM28HZ/52W-V1RC16N000 | HYH10VM28HZ/52W-V1RC16N000 | 28.0 cm³ / 8.0 cm³ | Hydraulic 2-Position (HZ) | Splined R (7/8" 13T), SAE B 2-Bolt | Threaded M27×2 Ports, Standard |
| A10VM45EZ2/52W-V1RC10N007P | HYH10VM45EZ2/52W-V1RC10N007P | 45.0 cm³ / 12.0 cm³ | Electric 2-Position (24V DC EZ2) | Splined R (1" 15T), SAE B 2-Bolt | SAE 3/4" Lateral + Flushing Valve (7) |
| A10VM45EZ1/52W-V1RC11N000P | HYH10VM45EZ1/52W-V1RC11N000P | 45.0 cm³ / 12.0 cm³ | Electric 2-Position (12V DC EZ1) | Splined R (1" 15T), SAE B 2-Bolt | SAE 3/4" Rear Ports (11N00), DEUTSCH |
| A10VM63EZ2/52W-V1RC10N007P | HYH10VM63EZ2/52W-V1RC10N007P | 62.0 cm³ / 16.0 cm³ | Electric 2-Position (24V DC EZ2) | Splined R (1 1/4" 14T), SAE B 2-Bolt | SAE 3/4" Lateral + Flushing Valve (7) |
| A10VM85EZ2/52W-V1RC10N007P | HYH10VM85EZ2/52W-V1RC10N007P | 87.0 cm³ / 22.0 cm³ | Electric 2-Position (24V DC EZ2) | Splined R (1 1/2" 17T), SAE C 2-Bolt | SAE 1" Lateral + Flushing Valve (7) |
Technical Specifications of HENGYUHANG HYH10VM Series (Sizes 28–85)
4.1 Frame Size Performance Matrix (Data at optimum viscosity νₒₚₜ=16…36 mm²/s, mineral fluid)
| Performance Parameter | Unit | HYH10VM28 | HYH10VM45 | HYH10VM63 | HYH10VM85 |
|---|---|---|---|---|---|
| Max Geometric Displacement (Vgₘₐₓ) | cm³/rev | 28.0 | 45.0 | 62.0 | 87.0 |
| Minimum Displacement Range 1 (Vg min adjustable) | cm³/rev | 8.0 to 28.0 | 12.0 to 25.0 | 16.0 to 38.0 | 22.0 to 50.0 |
| Minimum Displacement Range 2 (Vg min adjustable) | cm³/rev | — | 26.0 to 45.0 | 40.0 to 62.0 | 48.0 to 85.0 |
| Max Rotational Speed at Vgₘₐₓ (nₙₒₘ) | rpm | 4,700 | 4,000 | 3,300 | 3,100 |
| Max Permissible Speed at Vg min (n_max perm) | rpm | 5,400 | 4,600 | 3,900 | 3,560 |
| Minimum Operating Speed (n_min continuous) | rpm | 250 | 250 | 250 | 250 |
| Inlet Flow Rate at nₙₒₘ and Vgₘₐₓ (qV_max) | L/min | 131.6 | 180.0 | 205.0 | 270.0 |
| Theoretical Output Torque at Vgₘₐₓ and p_N=280 bar (M_max) | Nm | 125 | 200 | 276 | 387 |
| Actual Starting Torque at n=0 rpm and p_N=280 bar | Nm | 92 | 149 | 205 | 253 |
| Drive Shaft Torsional Stiffness Shaft R (c) | Nm/rad | 26,000 | 41,000 | 69,400 | 152,900 |
| Drive Shaft Torsional Stiffness Shaft W (c) | Nm/rad | 19,800 | 34,400 | 54,000 | 117,900 |
| Rotary Group Moment of Inertia (J_TW) | kg·m² | 0.0017 | 0.0033 | 0.0056 | 0.0120 |
| Maximum Permissible Angular Acceleration (α) | rad/s² | 5,500 | 4,000 | 3,300 | 2,700 |
| Housing Case Fluid Volume | L | 0.6 | 0.7 | 0.8 | 1.0 |
| Weight (Approximate Dry Mass) | kg | 14 | 18 | 26 | 34 |
4.2 Operating Pressure Boundaries
| Pressure Characteristic | Permissible Value | Operational Definition & Safety Limits |
|---|---|---|
| Nominal Operating Pressure (pₙₒₘ) | 280 bar (4,000 psi) | Maximum continuous design fatigue pressure according to ISO/DIN 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 Side (p_HD absolute) | ≥10 bar (145 psi) absolute | Minimum pressure at port A or B required to prevent rotary group separation |
| Minimum Pressure on Low-Pressure Side (p_ND min absolute) | ≥2 bar (29 psi) absolute | Minimum pressure at low-pressure port to prevent cavitation during motor overrun |
| Rate of Pressure Change (RAₘₐₓ) | 16,000 bar/s (232,000 psi/s) | Maximum permissible speed of pressure build-up and reduction across duty cycle |
| Case Drain Permissible Pressure (p_L max at Ports L, L1) | ≤2 bar (29 psi) absolute | Continuous static case pressure; maximum 0.5 bar higher than inlet pressure; peak ≤4 bar |
| Control Operating Pressure at Port G / X | ≤350 bar (5,100 psi) | Maximum allowable control signal pressure rating |
4.3 Hydraulic Fluid & Temperature Operational Limits
| Fluid Characteristic | Permissible Value | Operational Note |
|---|---|---|
| Recommended Fluid Media | Mineral oil (HLP to DIN 51524) | High-performance petroleum-based hydraulic fluid with anti-wear additives |
| Optimum Operating Viscosity (νₒₚₜ) | 16 to 36 mm²/s | Optimum balance of volumetric efficiency, response time, and bearing life |
| Continuous Operating Viscosity | 10 to 400 mm²/s | Full operational envelope with continuous temperature monitoring measured at port L |
| Minimum Viscosity (νₘᵢₙ) | 7 to 10 mm²/s | Short-term limit (t≤1 min) at p≤0.3⋅pₙₒₘ, T_max=+110 ∘C (FKM) |
| 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 ≤3 min) |
| Permissible Fluid Temperature Range | −25 ∘C to +110 ∘C (−13 ∘F to +230 ∘F) | Full operating phase with standard FKM dynamic seals |
| Fluid Cleanliness Class | ISO 4406 Class 20/18/15 | At elevated temperatures (>90 ∘C), maintain Class 19/17/14 minimum |
Product Advantages
Standard 2-Hole SAE Flange Mounting (SAE B / SAE C)
Features standard 2-bolt SAE mounting flanges and splined shaft extensions for direct bolted installation onto external reduction gearboxes, pump drive splitters, winches, and machine frames.
Approved for High Rotational Speeds (Up to 5,400 rpm)
Precision-balanced bi-metal cylinder block kinematics and lightweight tapered pistons permit high continuous input speeds at reduced displacement without cavitation or slipper lift-off.
Two-Speed Displacement Flexibility with Stepless Minimum Limit
Externally adjustable minimum displacement stops allow fine-tuning of machine top travel speed or winch hoisting velocity while retaining maximum displacement torque for high-load operations.
Proven A10 Rotary Group Reliability
Incorporates field-tested A10 swashplate components, hydrostatic cradle bearings, and high-strength ductile iron housings for extended service life under continuous cyclic loading.
Bi-Directional Reversible Rotation
Symmetric valve plates and porting support smooth bi-directional operation across forward/reverse drive or hoisting/lowering cycles.
Integrated Flushing & Speed Sensing Options
Available with internal loop flushing valves for closed-circuit heat dissipation and prepared speed-sensor ports for precise digital traction and control monitoring.
| Interchangeability & Cross Reference
6.1 Direct Replacement Matrix: Bosch Rexroth A10VM to HENGYUHANG HYH10VM
| OEM Model Code | Max Displacement | Min Displacement Range | Mounting Flange | Working Ports | HENGYUHANG 1:1 Replacement |
| A10VM28.../52 | 28.0 cm³/rev | 8.0 to 28.0 cm³/rev | SAE 101-2 (B) 2-Hole | SAE 3/4" (Code 10) / M27×2 (Code 16) | HYH10VM28 |
| A10VM45.../52 | 45.0 cm³/rev | 12.0 to 25.0 cm³/rev (Range 1) 26.0 to 45.0 cm³/rev (Range 2) | SAE 101-2 (B) 2-Hole | SAE 3/4" Lateral (10) / Rear (11) / M27×2 (16) | HYH10VM45 |
| A10VM63.../52 | 62.0 cm³/rev | 16.0 to 38.0 cm³/rev (Range 1) 40.0 to 62.0 cm³/rev (Range 2) | SAE 101-2 (B) 2-Hole | SAE 3/4" (Code 10) / M27×2 (Code 16) | HYH10VM63 |
| A10VM85.../52 | 87.0 cm³/rev | 22.0 to 50.0 cm³/rev (Range 1) 48.0 to 85.0 cm³/rev (Range 2) | SAE 127-2 (C) 2-Hole | SAE 1" Lateral (Code 10 / 60) | HYH10VM85 |
6.2 Modular Controller Functionality Mapping
| Controller Code | Control Mechanism | Operating Characteristic | Machine Operational Role |
| DG | Two-Point Direct Control | Direct-operated by external control pressure signal (Port G) | Simple 2-speed shifting via machine hydraulic pilot circuit |
| HZ | Hydraulic Two-Point Control | Switched hydraulically via pilot pressure line (Port X) | Standard 2-speed travel drive shifting (Turtle/Rabbit mode) |
| HZ6 | Hydraulic Two-Point + Orifice | Integrated damping orifice controls swashplate shift time | Smooth, shock-free speed transitions preventing operator jerk |
| EZ1 / EZ2 | Electric Two-Point Control | Solenoid actuated (U = 12 V for EZ1, 24 V for EZ2) | Direct electronic push-button or ECU-controlled 2-speed shifting |
| EZ6 / EZ7 | Electric Two-Point + Orifice | Electric solenoid with integrated switching time orifice (12V/24V) | Electronically managed smooth ratio shifting with DEUTSCH connector |
| Brand Replacement
Bosch Rexroth (Primary 1:1 direct interchangeability for A10VM Series 52 axial piston variable motors)
Danfoss (Series 51 and H1B swashplate variable motors with SAE mounting)
Eaton / Vickers and Parker Hannifin variable displacement motor retrofits engineered upon request
| Applications
Tracked Utility & Carrier Drives: Two-speed propel drive motors mounted directly to track final drive reduction boxes.
Agricultural Harvesters & Mower Decks: Auxiliary header drives and reel drives requiring smooth continuous speed variation.
Mobile Winch & Crane Hoists: High-speed variable motors driving winch drums with dynamic two-speed shifting.
Road Maintenance & Sweepers: Broom and brush drive motors operating across varying work speeds and travel modes.
Horizontal Directional Drilling (HDD) Rigs: Carriage thrust and rotation auxiliary drives.
Forestry Processing Heads: High-speed feed roller and saw drive variable motors.
| 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:
Multi-Axis CNC Machining Infrastructure:
In-house precision machining centers, advanced spherical cup grinding lines, and automated honing cells process every motor housing, cylinder block, and valve plate under climate-controlled conditions.
Sub-Micron Micro-Finishing (Ra < 0.2 μm):
Critical dynamic friction pairs—including piston slipper pads, swashplate cradle surfaces, and valve plate running tracks—undergo super-finishing to ensure fluid-film hydro-dynamic equilibrium, minimal internal leakage, and zero micro-scuffing even under high operating temperatures.
Metallurgical Integrity & Thermal Hardening:
High-grade nodular ductile iron castings and hardened alloy piston assemblies withstand continuous 280 bar rated duty and 350 bar transient dynamic shock spikes without structural distortion or bore deformation.
100% Full-Cycle Multi-Parameter Factory Inspection & Digital Testing:
End-of-Line Automated Test Bench Validation:
Every assembled HYH10VM motor undergoes mandatory, computer-controlled testing simulating real-world excavator travel and winch drive duty cycles.
High-Standard Performance Criteria:
Volumetric Efficiency Verification: Proven > 94% at full displacement under full working pressure, eliminating sluggish machine drive response.
Pressure Endurance Verification: 100% sustained high-pressure hold at 280 bar nominal and 350 bar peak with zero external seal weepage.
Case Drain Flow Measurement: Real-time monitoring ensures internal bypass flow remains strictly within engineering limits, protecting machine coolers from excess heat generation.
Dynamic Two-Speed Response: Millisecond-level tracking of swashplate shift response from Vg max down to Vg min under DG, HZ, and EZ control modes, verifying smooth, hysteresis-free transition without machine jerk.
Full Traceability: Individual test data curves and quality inspection logs are archived per unit serial number before packaging.
Seamless 1:1 OEM Drop-In Interchangeability (True Plug-and-Play):
Exact Dimensional Match:
Flange pilot diameters (SAE 101-2 / SAE B and SAE 127-2 / SAE C), bolt circle PCDs, and face-to-port dimensions correspond 1:1 to original Bosch Rexroth A10VM Series 52 specifications down to the millimeter.
Zero Piping or Chassis Rework:
Standard side SAE split-flange ports (Port Plate 10/60) and rear SAE ports (Port Plate 11/61) connect directly to existing high-pressure hose assemblies and winch brackets with zero pipe bending or adaptor refitting.
Drive Spline Conformity:
ANSI B92.1a involute splines (Shaft Code R and W) mesh seamlessly with OEM planetary gearboxes and travel reduction drives without spline binding, backlash vibration, or premature drive hub wear.
Flexible Engineering Customization & Rapid Prototyping:
Tailored Displacement Settings:
Factory-preset minimum displacement screws (Vg min) calibrated exactly to client gearbox speed requirements prior to shipment, saving field commissioning labor.
Custom Orifice & Shift Tuning:
Tailored internal shift damping orifices (HZ6 / EZ6) engineered to dampen shift shock in sensitive hydrostatic transmissions.
Agile OEM/ODM Solutions:
Experienced fluid power engineers provide rapid turnaround for customized port thread standards (Metric / SAE / BSPP), specialized shaft extensions, and integrated dual counterbalance/flushing valve blocks, backed by flexible, low-MOQ policies for trial batches.
Robust Supply Chain, Extensive Inventory & Fast Global Dispatch:
Strategic Component Buffering:
Continuous safety stocks of fully machined motor housings, finished rotary groups, precision bearing kits, and modular EZ/HZ pilot controllers maintained at the factory warehouse.
Rapid 48–72 Hour Dispatch:
Standard configurations and replacement units ship within 48 to 72 hours of order confirmation, eliminating costly mobile machinery downtime.
Global Multimodal Logistics:
Established partnerships with tier-1 international freight forwarders, supporting express courier (DHL, FedEx, UPS), air cargo, and door-to-door DDP ocean shipping with full customs handling.
12-Month Comprehensive Warranty & Dedicated Lifetime Technical Support:
Full-Protection Factory Warranty:
Comprehensive 12-month warranty covering any manufacturing or material defects with immediate replacement-part dispatch support.
24-Hour Drawing & Model Code Verification:
Dedicated technical desk reviews customer machine models, nameplates, port layouts, and dimensional drawings within 24 hours to guarantee zero ordering errors.
Direct Hydraulic Engineering Consultation:
Direct technical access to fluid power engineers for circuit troubleshooting, oil contamination analysis, flushing flow sizing, and replacement cross-referencing throughout the machine's entire operational lifecycle.
HENGYUHANG Axial Piston Variable Motor HYH10VM Series 52
HENGYUHANG Axial Piston Variable Motor HYH10VM Series 52 is a high-performance, swashplate-design axial piston variable displacement hydraulic motor engineered specifically for both open and closed hydrostatic transmission circuits. Built on field-proven A10 rotary unit architecture, the HYH10VM Series 52 delivers exceptional rotational speed capability, superior power density, low operating noise, and extended operational service life under continuous heavy-duty cyclic loading. Featuring standard SAE 2-bolt mounting flanges (Code C, ISO 3019-1) across nominal displacements of 28, 45, 63, and 87 cm³/rev, the HYH10VM Series 52 serves as a precision-engineered, direct dimensional and functional drop-in replacement for OEM Bosch Rexroth A10VM Series 52 variable motors across mobile travel drives, auxiliary winches, construction machinery, forestry harvesters, and industrial hydrostatic transmissions.
Key Technical & Operational Features
Well-Tried A10 Rotary Group Technology: Field-proven swashplate mechanism with optimized hydrostatically balanced slipper-piston assemblies, providing high volumetric and mechanical-hydraulic efficiency throughout all operating swivel angles.
Continuous High-Pressure Rating: Rated for a nominal continuous operating pressure of 280 bar (4100 psi) and a maximum peak pressure limit of 350 bar (5100 psi) at working ports A and B.
Approved for Extreme Rotational Speeds: Advanced rotary balance allows continuous rotational speeds up to 4700 rpm at maximum displacement (Vg max) and high-speed overspeed ratings up to 5400 rpm at minimum displacement (Vg min).
Infinitely Adjustable Minimum Displacement: Equipped with an external mechanical stop screw allowing stepless field calibration of Vg min between 8 cm³ and maximum displacement, preventing motor stalling or overspeeding in hydrostatic circuits.
Versatile Two-Point Control Configurations: Available with direct hydraulic two-point control (DG), pilot-operated hydraulic control (HZ / HZ6 with internal shuttle valve and orifice damping), or 12V/24V DC electric solenoid switching (EZ1, EZ2, EZ6, EZ7).
Standard SAE 2-Bolt Flange Housing: Rigid cast iron housing conforming to ISO 3019-1 (SAE-B on sizes 28, 45, 63; SAE-C on size 85) for versatile bracket, gearbox, or direct frame mounting.
Flexible Port Configurations & Circuit Flushing: High-pressure SAE Code 62 flange ports (ISO 6162-2, 6000 psi) lateral or rear, plus threaded metric (DIN 3852-1) or UN (ISO 11926) port options, with optional integrated flushing and boost pressure valves (Code 7) for closed circuits.
Bi-Directional Reversible Operation: Symmetrical porting and valve block design enable seamless clockwise and counter-clockwise rotation with identical performance and pressure ratings in both flow directions.
Heavy-Duty Industrial & Mobile Applications
The HENGYUHANG HYH10VM Series 52 variable displacement motor is extensively applied in hydrostatic travel drives, winches, and auxiliary rotary actuators requiring variable speed, high starting torque, and rapid two-point displacement down-swiveling:
Mobile Construction & Earthmoving: Compact wheel loaders, municipal sweepers, skid-steer loaders, track trenchers, asphalt pavers, road rollers, and mini-excavator auxiliary swing drives.
Agricultural & Forestry Machinery: Combine harvester header and ground drives, self-propelled crop sprayers, timber forwarder bogies, forestry harvester feeding rollers, and mulchers.
Material Handling & Lifting Winches: Mobile crane hoisting winches, drill rig wireline winches, marine deck capstans, offshore spooling reels, and heavy forklift hydrostatic transmissions.
Mining & Municipal Equipment: Underground drill head rotators, concrete transit mixer drum drives, snow grooming vehicles, utility crawler vehicles, and industrial conveyor drives.
Technical Performance Matrix (OEM Benchmark Standard)
| Technical Parameter / Unit | Size 28 | Size 45 | Size 63 | Size 85 |
|---|---|---|---|---|
| Maximum Geometric Displacement Vg max [cm³] | 28 | 45 | 62 | 87 |
| Minimum Geometric Displacement Vg min (Setting 1) [cm³] | 8 to 28 | 12 to 25 | 16 to 38 | 22 to 50 |
| Minimum Geometric Displacement Vg min (Setting 2) [cm³] | – | 26 to 45 | 40 to 62 | 48 to 85 |
| Nominal Continuous Working Pressure pN [bar / psi] | 280 / 4100 | 280 / 4100 | 280 / 4100 | 280 / 4100 |
| Maximum Peak Pressure pmax [bar / psi] | 350 / 5100 | 350 / 5100 | 350 / 5100 | 350 / 5100 |
| Nominal Speed at Vg max (nnom) [rpm] | 4700 | 4000 | 3300 | 3100 |
| Maximum Speed at Vg min (nmax perm) [rpm] | 5400 | 4600 | 3900 | 3560 |
| Minimum Continuous Speed (nmin) [rpm] | 250 | 250 | 250 | 250 |
| Maximum Inlet Flow qv max (at nnom, Vg max) [L/min] | 131.6 | 180.0 | 205.0 | 270.0 |
| Max Theoretical Torque Mmax (at Vg max, Δp = 280 bar) [Nm] | 125 | 200 | 276 | 387 |
| Actual Starting Torque (at n = 0 rpm, Δp = 280 bar) [Nm] | 92 | 149 | 205 | 253 |
| Rotary Stiffness of Drive Shaft R [Nm/rad] | 26,000 | 41,000 | 69,400 | 152,900 |
| Rotary Stiffness of Drive Shaft W [Nm/rad] | 19,800 | 34,400 | 54,000 | 117,900 |
| Moment of Inertia of Rotary Group JTW [kg·m²] | 0.0017 | 0.0033 | 0.0056 | 0.0120 |
| Maximum Angular Acceleration α [rad/s²] | 5500 | 4000 | 3300 | 2700 |
| Case Fluid Volume [L] | 0.6 | 0.7 | 0.8 | 1.0 |
| Permissible Radial Shaft Force Fq max (at X/2) [N] | 1200 | 1500 | 1700 | 2000 |
| Permissible Axial Shaft Force ±Fax max [N] | ±1000 | ±1500 | ±2000 | ±3000 |
| Dry Weight (Approximate, with DG control) [kg] | 14.0 | 18.0 | 26.0 | 34.0 |
* Values apply under optimum hydraulic oil viscosity range νopt = 16 to 36 mm²/s. Permissible speeds depend on circuit low-pressure level. Consult HENGYUHANG technical support for specialized external radial or axial drive shaft loads.
Mechanical Installation Interface Specifications
Part 1: Mounting flange dimensions (ISO 3019-1 / SAE 2-bolt), pilot diameter, bolt circle, and splined drive shaft configurations.
| Frame Size (NG) | Mounting Flange Code | SAE Standard & Pilot Ø | Hole Spacing & Clearance | Overall Flange Width | Drive Shaft Code R (Standard / High Torque) | Drive Shaft Code W (Reduced Torque) |
|---|---|---|---|---|---|---|
| HYH10VM28 | Code C (2-bolt) | SAE-B (Ø101.6 -0.054 mm) | 146.0 mm / 2x Ø14.3 mm holes | 172.0 mm | Splined 7/8 in 13T 16/32DP (ANSI B92.1a, L=41 mm) | – (Not Available on NG28) |
| HYH10VM45 | Code C (2-bolt) | SAE-B (Ø101.6 -0.054 mm) | 146.0 mm / 2x Ø14.3 mm holes | 172.0 mm | Splined 1.0 in 15T 16/32DP (ANSI B92.1a, L=45.9 mm) | Splined 7/8 in 13T 16/32DP (ANSI B92.1a, L=41 mm) |
| HYH10VM63 | Code C (2-bolt) | SAE-B (Ø101.6 -0.054 mm) | 146.0 mm / 2x Ø14.3 mm holes | 172.0 mm | Splined 1 1/4 in 14T 12/24DP (ANSI B92.1a, L=55.4 mm) | Splined 1.0 in 15T 16/32DP (ANSI B92.1a, L=45.9 mm) |
| HYH10VM85 | Code C (2-bolt) | SAE-C (Ø127.0 -0.063 mm) | 181.0 mm / 2x Ø17.5 mm holes | 210.0 mm | Splined 1 1/2 in 17T 12/24DP (ANSI B92.1a, L=61.9 mm) | Splined 1 1/4 in 14T 12/24DP (ANSI B92.1a, L=55.4 mm) |
Fluid Connection & Port Configuration Specifications
Part 2: Hydraulic fluid connections across working lines A/B, case drain ports L/L1, external control ports G/G1, and pilot signal port X.
| Frame Size (NG) | Working Ports A & B (Flange Port 10 / 60) | Working Ports A & B (Threaded Port 16 / 66) | Rear Working Ports (Port 11 / 61) | Case Drain Ports L, L1 (ISO 11926) | Control Pressure G, G1 (DG) | Pilot Pressure X (HZ) |
|---|---|---|---|---|---|---|
| HYH10VM28 | SAE 3/4 in (ISO 6162-2 Code 62, M10 or 3/8-16 UNC) | M27×2 (DIN 3852) or 1 1/16-12 UN-2B (ISO 11926) | – (Not Available on NG28) | 3/4-16 UNF-2B (Depth 15 mm, pmax 4 bar) | 7/16-20 UNF-2B (pmax 350 bar) | 7/16-20 UNF-2B (pmax 350 bar) |
| HYH10VM45 | SAE 3/4 in (ISO 6162-2 Code 62, M10 or 3/8-16 UNC) | M27×2 (DIN 3852) or 1 1/16-12 UN-2B (ISO 11926) | SAE 3/4 in Code 62 at Rear (M10 or 3/8-16 UNC) | 7/8-14 UNF-2B (Depth 17 mm, pmax 4 bar) | 7/16-20 UNF-2B (pmax 350 bar) | 7/16-20 UNF-2B (pmax 350 bar) |
| HYH10VM63 | SAE 3/4 in (ISO 6162-2 Code 62, M10 or 3/8-16 UNC) | M27×2 (DIN 3852) or 1 1/16-12 UN-2B (ISO 11926) | – (Not Available on NG63) | 7/8-14 UNF-2B (Depth 17 mm, pmax 4 bar) | 7/16-20 UNF-2B (pmax 350 bar) | 7/16-20 UNF-2B (pmax 350 bar) |
| HYH10VM85 | SAE 1.0 in (ISO 6162-2 Code 62, M12 or 7/16-14 UNC) | – (Flange Ports Only on NG85) | – (Not Available on NG85) | 1 1/16-12 UNF-2B (Depth 20 mm, pmax 4 bar) | 7/16-20 UNF-2B (pmax 350 bar) | 7/16-20 UNF-2B (pmax 350 bar) |
Two-Point Displacement Control Devices & Operating Principles
| Control Code | Actuation Mode & Signals | Functional Characteristics & Circuit Dynamics |
|---|---|---|
| DG | Direct Hydraulic Two-Point (External Control Supply) | Motor swivels to minimum displacement (Vg min) when external pilot pressure pst ≥ 40 bar is applied to port G or G1. Required pilot pressure depends on working line pressure pB (max permissible pst = 280 bar). Swivels back to Vg max when pst = 0 bar via return spring. |
| HZ / HZ6 | Hydraulic Two-Point Control (Internal Shuttle Valve) | Control pressure is supplied internally from the higher-pressure working line (requires circuit differential ΔpA,B ≥ 30 bar). Motor swivels to Vg min when pilot pressure pX ≥ 30 bar is applied to port X. Swivels back to Vg max when pX ≤ 10 bar. Version HZ6 incorporates a calibrated damping orifice (standard Ø0.25 mm) to extend switching time and prevent hydraulic shock. |
| EZ1 / EZ6 | Electric Solenoid 12V DC (Internal Pressure Supply) | Internal high-pressure supply with 12V DC switching solenoid (1.5 A at 20 °C, 100% duty cycle, DEUTSCH 2-pin connector). De-energized = Vg max (high torque, low speed); Energized = Vg min (high speed travel mode). Requires ΔpA,B ≥ 30 bar. Version EZ6 features an integrated switching-time damping orifice (Ø0.25 mm). |
| EZ2 / EZ7 | Electric Solenoid 24V DC (Internal Pressure Supply) | Internal high-pressure supply with 24V DC switching solenoid (0.8 A at 20 °C, 100% duty cycle, IP67/IP69K protection). De-energized = Vg max; Energized = Vg min. Requires working differential ΔpA,B ≥ 30 bar. Version EZ7 incorporates the calibrated damping orifice (Ø0.25 mm) for smooth displacement transitions without driveline jerking. |
HENGYUHANG HYH10VM Series 52 Ordering Code Structure
| Pos. | Code Segment | Available Options | Description & Engineering Specifications |
|---|---|---|---|
| 01 | Axial Piston Unit | HYH10V | Swashplate variable displacement unit, nominal pressure 280 bar, peak pressure 350 bar |
| 02 | Operating Mode | M | Motor, open and closed hydrostatic circuits |
| 03 | Nominal Size (NG) | 28 45 63 85 | Nominal displacement: 28 cm³/rev Nominal displacement: 45 cm³/rev Nominal displacement: 62 cm³/rev Nominal displacement: 87 cm³/rev |
| 04 | Control Devices | DG HZ HZ6 EZ1 / EZ6 EZ2 / EZ7 | Two-point control, direct operated (external pilot pressure pst ≥ 40 bar) Two-point control, hydraulic (pilot pressure pX ≥ 30 bar, internal high-pressure supply) Hydraulic two-point control with switching time damping orifice (Ø0.25 mm) Electric two-point control, 12V DC solenoid (without / with damping orifice) Electric two-point control, 24V DC solenoid (without / with damping orifice) |
| 05 | Series Index | 52 | Series 5, Index 2 |
| 06 | Direction of Rotation | W | Bi-directional (reversible, viewed on drive shaft) |
| 07 | Minimum Displacement | 1 2 | Screw setting range 1: NG28 (8–28 cm³), NG45 (12–25 cm³), NG63 (16–38 cm³), NG85 (22–50 cm³) Screw setting range 2: NG45 (26–45 cm³), NG63 (40–62 cm³), NG85 (48–85 cm³) |
| 08 | Sealing Material | V | FKM (Fluorocarbon rubber / Viton seals, high-temperature rating) |
| 09 | Drive Shaft Code | R W | Splined shaft similar to ISO 3019-1 (ANSI B92.1a standard / high torque rating) Splined shaft similar to ISO 3019-1 (reduced torque rating; sizes 45, 63, 85) |
| 10 | Mounting Flange | C | Based on ISO 3019-1 (SAE 2-hole; SAE-B on sizes 28/45/63; SAE-C on size 85) |
| 11 | Working Ports A & B | 10N00 11N00 16N00 60N00 61N00 66N00 | Flange ports ISO 6162-2 lateral same side, Metric fastening thread (sizes 28–85) Flange ports ISO 6162-2 at rear, Metric fastening thread (size 45 only) Threaded ports DIN 3852-1 metric, lateral same side (sizes 28, 45, 63) Flange ports ISO 6162-2 lateral same side, UNC fastening thread (sizes 28–85) Flange ports ISO 6162-2 at rear, UNC fastening thread (size 45 only) Threaded ports ISO 11926 UN thread, lateral same side (sizes 28, 45, 63) |
| 12 | Valves & Flushing | 0 7 | Standard without valve block Integrated flushing and boost pressure valve (for closed loop circuit thermal purging) |
| 13 | Speed Sensing | Omitted | Standard housing prepared without speed pickup sensor |
| 14 | Solenoid Connector | Omitted P | Without electrical connector (for hydraulic controls DG, HZ, HZ6) DEUTSCH molded 2-pin connector DT04-2P-EP04 (for electric controls EZx) |
Example Standard Order Code: HYH10VM45DG/52W-VSC10N000 (Size 45, DG Hydraulic Control, Series 52, Bi-directional, Setting 1, FKM Seals, Splined Shaft R, SAE-B 2-Bolt Flange, Metric SAE 3/4" Ports, Without Valve).
Direct Interchangeability & OEM Cross-Reference Matrix
HENGYUHANG HYH10VM Series 52 variable displacement hydraulic motors are 100% dimensionally interchangeable with original Bosch Rexroth A10VM Series 52 units, matching shaft splines, flange pilots, port centerlines, and control response curves:
| OEM Rexroth Model Code | HENGYUHANG Replacement Code | Displacement & Flange | Control Option | Shaft & Ports | Interchangeability |
|---|---|---|---|---|---|
| A10VM 28 DG /52W-VSC10N000 | HYH10VM 28 DG /52W-VSC10N000 | 28 cm³, SAE-B 2-Bolt | DG Direct Hyd. | Splined 7/8", SAE 3/4" Lateral | 100% Drop-In |
| A10VM 28 EZ2 /52W-VSC10N000P | HYH10VM 28 EZ2 /52W-VSC10N000P | 28 cm³, SAE-B 2-Bolt | EZ2 24V Solenoid | Splined 7/8", SAE 3/4" Lateral | 100% Drop-In |
| A10VM 45 DG /52W-VSC10N000 | HYH10VM 45 DG /52W-VSC10N000 | 45 cm³, SAE-B 2-Bolt | DG Direct Hyd. | Splined 1.0", SAE 3/4" Lateral | 100% Drop-In |
| A10VM 45 HZ /52W-VSC10N000 | HYH10VM 45 HZ /52W-VSC10N000 | 45 cm³, SAE-B 2-Bolt | HZ Pilot Hyd. | Splined 1.0", SAE 3/4" Lateral | 100% Drop-In |
| A10VM 45 EZ1 /52W-VSC11N000P | HYH10VM 45 EZ1 /52W-VSC11N000P | 45 cm³, SAE-B 2-Bolt | EZ1 12V Solenoid | Splined 1.0", SAE 3/4" Rear | 100% Drop-In |
| A10VM 63 DG /52W-VSC10N000 | HYH10VM 63 DG /52W-VSC10N000 | 62 cm³, SAE-B 2-Bolt | DG Direct Hyd. | Splined 1 1/4", SAE 3/4" Lateral | 100% Drop-In |
| A10VM 63 EZ2 /52W-VSC10N007P | HYH10VM 63 EZ2 /52W-VSC10N007P | 62 cm³, SAE-B 2-Bolt | EZ2 24V Solenoid | Splined 1 1/4", Flushing Valve | 100% Drop-In |
| A10VM 85 DG /52W-VSC10N000 | HYH10VM 85 DG /52W-VSC10N000 | 87 cm³, SAE-C 2-Bolt | DG Direct Hyd. | Splined 1 1/2", SAE 1.0" Lateral | 100% Drop-In |
| A10VM 85 EZ2 /52W-VSC10N000P | HYH10VM 85 EZ2 /52W-VSC10N000P | 87 cm³, SAE-C 2-Bolt | EZ2 24V Solenoid | Splined 1 1/2", SAE 1.0" Lateral | 100% Drop-In |
Hydraulic Commissioning & Installation Guidelines
1. Initial Priming & Case Deaeration: Prior to commissioning, the motor case must be completely filled with filtered hydraulic oil through the highest positioned drain port (L or L1) and thoroughly deaerated. Operating the motor while dry or partially filled will cause catastrophic boundary-lubrication failure of the swashplate cradle and piston slippers.
2. Case Drain Line Routing: Always pipe the case drain line from the uppermost drain port directly to the reservoir without restrictive check valves or in-line filters. Maximum continuous housing pressure must not exceed 2.0 bar abs (maximum surge peak ≤ 4.0 bar abs). Install a dedicated drain line with a minimum slope towards the reservoir.
3. Low-Pressure Cavitation Prevention: During overrunning, braking, or high-speed freewheeling at minimum displacement Vg min, adequate minimum boost pressure (low-pressure side pHD ≥ 10–15 bar) must be maintained at port A or B to prevent cavitation, piston lift-off, and rotary group separation.
4. Fluid Cleanliness & Filtration: Cleanliness class according to ISO 4406 must be maintained at 20/18/15 or cleaner. Use return-line filtration with a filtration rating of β10 ≥ 100 to ensure maximum rotary group lifespan.
5. Minimum Displacement Setting Verification: When adjusting the minimum displacement stop screw Vg min, verify that the resulting motor speed at maximum circuit flow does not exceed the maximum permissible speed nmax perm listed in the technical data table.
Data Verification & Technical Notes
Reference Benchmark Datasheet: Bosch Rexroth AG Technical Datasheet RE 91703 (Edition: 2026-06-17), Pages 1–25, 37–42 (Axial Piston Variable Motor A10VM Series 52).
Quality Guarantee & Testing: Every HENGYUHANG HYH10VM Series 52 motor undergoes dynamic test-bench evaluation for full volumetric efficiency, starting torque, displacement swiveling response, and case leakage under 280 bar nominal and 350 bar peak pressure before shipment.
Custom Engineering & Conversions: In addition to standard SAE 2-bolt A10VM configurations, HENGYUHANG supplies specialized shaft splines, custom minimum displacement calibration, metric/UNF port adapters, and plug-in housings (HYH10VE Series 52) upon request.
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HENGYUHANG HYH10VM Series 52 Ordering Code Structure
| Pos. | Code Segment | Available Options | Description & Engineering Specifications |
|---|---|---|---|
| 01 | Axial Piston Unit | HYH10V | Swashplate variable displacement unit, nominal pressure 280 bar, peak pressure 350 bar |
| 02 | Operating Mode | M | Motor, open and closed hydrostatic circuits |
| 03 | Nominal Size (NG) | 28 45 63 85 | Nominal displacement: 28 cm³/rev Nominal displacement: 45 cm³/rev Nominal displacement: 62 cm³/rev Nominal displacement: 87 cm³/rev |
| 04 | Control Devices | DG HZ HZ6 EZ1 / EZ6 EZ2 / EZ7 | Two-point control, direct operated (external pilot pressure pst ≥ 40 bar) Two-point control, hydraulic (pilot pressure pX ≥ 30 bar, internal high-pressure supply) Hydraulic two-point control with switching time damping orifice (Ø0.25 mm) Electric two-point control, 12V DC solenoid (without / with damping orifice) Electric two-point control, 24V DC solenoid (without / with damping orifice) |
| 05 | Series Index | 52 | Series 5, Index 2 |
| 06 | Direction of Rotation | W | Bi-directional (reversible, viewed on drive shaft) |
| 07 | Minimum Displacement | 1 2 | Screw setting range 1: NG28 (8–28 cm³), NG45 (12–25 cm³), NG63 (16–38 cm³), NG85 (22–50 cm³) Screw setting range 2: NG45 (26–45 cm³), NG63 (40–62 cm³), NG85 (48–85 cm³) |
| 08 | Sealing Material | V | FKM (Fluorocarbon rubber / Viton seals, high-temperature rating) |
| 09 | Drive Shaft Code | R W | Splined shaft similar to ISO 3019-1 (ANSI B92.1a standard / high torque rating) Splined shaft similar to ISO 3019-1 (reduced torque rating; sizes 45, 63, 85) |
| 10 | Mounting Flange | C | Based on ISO 3019-1 (SAE 2-hole; SAE-B on sizes 28/45/63; SAE-C on size 85) |
| 11 | Working Ports A & B | 10N00 11N00 16N00 60N00 61N00 66N00 | Flange ports ISO 6162-2 lateral same side, Metric fastening thread (sizes 28–85) Flange ports ISO 6162-2 at rear, Metric fastening thread (size 45 only) Threaded ports DIN 3852-1 metric, lateral same side (sizes 28, 45, 63) Flange ports ISO 6162-2 lateral same side, UNC fastening thread (sizes 28–85) Flange ports ISO 6162-2 at rear, UNC fastening thread (size 45 only) Threaded ports ISO 11926 UN thread, lateral same side (sizes 28, 45, 63) |
| 12 | Valves & Flushing | 0 7 | Standard without valve block Integrated flushing and boost pressure valve (for closed loop circuit thermal purging) |
| 13 | Speed Sensing | Omitted | Standard housing prepared without speed pickup sensor |
| 14 | Solenoid Connector | Omitted P | Without electrical connector (for hydraulic controls DG, HZ, HZ6) DEUTSCH molded 2-pin connector DT04-2P-EP04 (for electric controls EZx) |
Example Standard Order Code: HYH10VM45DG/52W-VSC10N000 (Size 45, DG Hydraulic Control, Series 52, Bi-directional, Setting 1, FKM Seals, Splined Shaft R, SAE-B 2-Bolt Flange, Metric SAE 3/4" Ports, Without Valve).
Direct Interchangeability & OEM Cross-Reference Matrix
HENGYUHANG HYH10VM Series 52 variable displacement hydraulic motors are 100% dimensionally interchangeable with original Bosch Rexroth A10VM Series 52 units, matching shaft splines, flange pilots, port centerlines, and control response curves:
| OEM Rexroth Model Code | HENGYUHANG Replacement Code | Displacement & Flange | Control Option | Shaft & Ports | Interchangeability |
|---|---|---|---|---|---|
| A10VM 28 DG /52W-VSC10N000 | HYH10VM 28 DG /52W-VSC10N000 | 28 cm³, SAE-B 2-Bolt | DG Direct Hyd. | Splined 7/8", SAE 3/4" Lateral | 100% Drop-In |
| A10VM 28 EZ2 /52W-VSC10N000P | HYH10VM 28 EZ2 /52W-VSC10N000P | 28 cm³, SAE-B 2-Bolt | EZ2 24V Solenoid | Splined 7/8", SAE 3/4" Lateral | 100% Drop-In |
| A10VM 45 DG /52W-VSC10N000 | HYH10VM 45 DG /52W-VSC10N000 | 45 cm³, SAE-B 2-Bolt | DG Direct Hyd. | Splined 1.0", SAE 3/4" Lateral | 100% Drop-In |
| A10VM 45 HZ /52W-VSC10N000 | HYH10VM 45 HZ /52W-VSC10N000 | 45 cm³, SAE-B 2-Bolt | HZ Pilot Hyd. | Splined 1.0", SAE 3/4" Lateral | 100% Drop-In |
| A10VM 45 EZ1 /52W-VSC11N000P | HYH10VM 45 EZ1 /52W-VSC11N000P | 45 cm³, SAE-B 2-Bolt | EZ1 12V Solenoid | Splined 1.0", SAE 3/4" Rear | 100% Drop-In |
| A10VM 63 DG /52W-VSC10N000 | HYH10VM 63 DG /52W-VSC10N000 | 62 cm³, SAE-B 2-Bolt | DG Direct Hyd. | Splined 1 1/4", SAE 3/4" Lateral | 100% Drop-In |
| A10VM 63 EZ2 /52W-VSC10N007P | HYH10VM 63 EZ2 /52W-VSC10N007P | 62 cm³, SAE-B 2-Bolt | EZ2 24V Solenoid | Splined 1 1/4", Flushing Valve | 100% Drop-In |
| A10VM 85 DG /52W-VSC10N000 | HYH10VM 85 DG /52W-VSC10N000 | 87 cm³, SAE-C 2-Bolt | DG Direct Hyd. | Splined 1 1/2", SAE 1.0" Lateral | 100% Drop-In |
| A10VM 85 EZ2 /52W-VSC10N000P | HYH10VM 85 EZ2 /52W-VSC10N000P | 87 cm³, SAE-C 2-Bolt | EZ2 24V Solenoid | Splined 1 1/2", SAE 1.0" Lateral | 100% Drop-In |
Hydraulic Commissioning & Installation Guidelines
1. Initial Priming & Case Deaeration: Prior to commissioning, the motor case must be completely filled with filtered hydraulic oil through the highest positioned drain port (L or L1) and thoroughly deaerated. Operating the motor while dry or partially filled will cause catastrophic boundary-lubrication failure of the swashplate cradle and piston slippers.
2. Case Drain Line Routing: Always pipe the case drain line from the uppermost drain port directly to the reservoir without restrictive check valves or in-line filters. Maximum continuous housing pressure must not exceed 2.0 bar abs (maximum surge peak ≤ 4.0 bar abs). Install a dedicated drain line with a minimum slope towards the reservoir.
3. Low-Pressure Cavitation Prevention: During overrunning, braking, or high-speed freewheeling at minimum displacement Vg min, adequate minimum boost pressure (low-pressure side pHD ≥ 10–15 bar) must be maintained at port A or B to prevent cavitation, piston lift-off, and rotary group separation.
4. Fluid Cleanliness & Filtration: Cleanliness class according to ISO 4406 must be maintained at 20/18/15 or cleaner. Use return-line filtration with a filtration rating of β10 ≥ 100 to ensure maximum rotary group lifespan.
5. Minimum Displacement Setting Verification: When adjusting the minimum displacement stop screw Vg min, verify that the resulting motor speed at maximum circuit flow does not exceed the maximum permissible speed nmax perm listed in the technical data table.
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