Piston Motors
HENGYUHANG HYHH6VM SAE 63 Series Axial Piston Variable Motor
Engineered with heavy-duty bent-axis rotary group technology and standard North American SAE 2-bolt and 4-bolt mounting flanges with ANSI splines and UN threads, the HENGYUHANG HYHH6VM Series 63 variable displacement motor delivers up to 6,500 psi (450 bar) peak pressure, high-speed swiveling down to zero displacement, and direct drop-in interchangeability for open and closed circuit hydrostatic transmissions.
| Applications
Specially tailored for North American and international mobile and industrial machinery, the HYHH6VM series powers wheeled excavator propel systems, forestry feller bunchers, rough-terrain mobile crane winches, oilfield fracturing blender drives, horizontal directional drills (HDD), and marine offshore mooring winches. Its bent-axis geometry ensures superior starting torque, high overspeed survivability, and compact driveline integration.
| Key Technical Specifications
Product Model: HYHH6VM Series 63 (HYHH6VM28, HYHH6VM55, HYHH6VM80, HYHH6VM107, HYHH6VM140, HYHH6VM160, HYHH6VM200, HYHH6VM250)
Brand Replacement: Bosch Rexroth AA6VM Series 63 (OEM or tailored as requested)
Displacement: 0 to 1.71 / 3.34 / 4.88 / 6.53 / 8.54 / 9.76 / 12.20 / 15.25 in³/rev (28.1 to 250 cm³/rev, infinitely variable down to Vg = 0)
Rotation Direction: Bi-directional / Reversible (Viewed on shaft end: W)
Speed Range: Up to 5,300 rpm at Vg max; up to 8,000 rpm at Vg < Vg,1; up to 8,800 rpm at Vg = 0
Peak Pressure: Nominal pN = 5,800 psi (400 bar); Maximum peak p max = 6,500 psi (450 bar)
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| Overview of HENGYUHANG HYHH6VM Series 63 Hydraulic Motors
The HENGYUHANG HYHH6VM Series 63 is an industrial-duty bent-axis axial piston variable displacement motor built specifically to North American SAE standards (SAE 2-bolt and 4-bolt mounting flanges, ANSI B92.1a involute splines, SAE J518 Code 62 split-flange ports with UNC fastening threads, and SAE O-ring boss UN ports). Designed for high-performance open and closed circuit hydrostatic drivelines, the motor combines a robust spherical valve plate with a wide displacement control range adjustable from full displacement (Vgmax) down to zero (Vg = 0). This high ratio allows mobile machinery to achieve tremendous tractive effort at crawl speeds while easily attaining high transport road speeds without multi-speed drop-boxes. Its heavy-duty tapered roller bearing arrangement withstands intense continuous driveline vibrations and substantial radial shaft loads.
| Dimension of HENGYUHANG HYHH6VM Series 63 Hydraulic Motors
| Mechanical SAE Mounting Interface Specifications
| Frame Size | SAE Mounting Flange Standard | Pilot Centering Spigot (∅) |
|---|---|---|
| HYHH6VM28 | SAE-B 2-bolt / ISO 100-4 | ∅4.0000" (∅101.6 −0.05/0 mm) / ∅100 mm |
| HYHH6VM55 | SAE-C 2-bolt (Flange C) | ∅5.0000" (∅127.0 −0.05/0 mm) |
| HYHH6VM80 | SAE-C 2-bolt (Flange C) | ∅5.0000" (∅127.0 −0.05/0 mm) |
| HYHH6VM107 | SAE-D 4-bolt (Flange D) | ∅6.0000" (∅152.4 −0.05/0 mm) |
| HYHH6VM140 | SAE-D 4-bolt / ISO 180-4 | ∅6.0000" (∅152.4 −0.05/0 mm) / ∅180 mm |
| HYHH6VM160 | SAE-D 4-bolt (Flange D) | ∅6.0000" (∅152.4 −0.05/0 mm) |
| HYHH6VM200 | SAE-E 4-bolt (Flange D) | ∅6.5000" (∅165.1 −0.05/0 mm) |
| HYHH6VM250 | SAE-E 4-bolt (Flange D) | ∅6.5000" (∅165.1 −0.05/0 mm) |
| Frame Size | Fastening Bolt Circle (PCD) / Bolt Holes | Standard ANSI B92.1a Involute Spline Shaft | High-Pressure Service Ports (SAE J518 Code 62) | Port Fastening UNC Threads |
|---|---|---|---|---|
| HYHH6VM28 | 5.750" (∅146.0 mm) / 2× ∅0.56" | 1" 15T 16/32DP / DIN Z5 | SAE 3/4" (6,000 psi) | 3/8-16 UNC-2B (18 mm deep) |
| HYHH6VM55 | 7.125" (∅181.0 mm) / 2× ∅0.69" | 1 1/4" 14T 12/24DP (Shaft S) | SAE 3/4" (6,000 psi) | 3/8-16 UNC-2B (18 mm deep) |
| HYHH6VM80 | 7.125" (∅181.0 mm) / 2× ∅0.69" | 1 1/4" 14T 12/24DP (Shaft S) | SAE 1" (6,000 psi) | 7/16-14 UNC-2B (22 mm deep) |
| HYHH6VM107 | 9.000" (∅228.6 mm) / 4× ∅0.81" | 1 3/4" 13T 8/16DP (Shaft S) | SAE 1" (6,000 psi) | 7/16-14 UNC-2B (22 mm deep) |
| HYHH6VM140 | 9.000" (∅228.6 mm) / 4× ∅0.81" | 1 3/4" 13T 8/16DP (Shaft S) | SAE 1 1/4" (6,000 psi) | 1/2-13 UNC-2B (19 mm deep) |
| HYHH6VM160 | 9.000" (∅228.6 mm) / 4× ∅0.81" | 1 3/4" 13T 8/16DP (Shaft S) | SAE 1 1/4" (6,000 psi) | 1/2-13 UNC-2B (19 mm deep) |
| HYHH6VM200 | 12.500" (∅317.5 mm) / 4× ∅0.81" | 2" 15T 8/16DP (Shaft S) | SAE 1 1/4" (6,000 psi) | 1/2-13 UNC-2B (19 mm deep) |
| HYHH6VM250 | 12.500" (∅317.5 mm) / 4× ∅0.81" | 2" 15T 8/16DP (Shaft S) | SAE 1 1/4" (6,000 psi) | 1/2-13 UNC-2B (19 mm deep) |
| Installation Specifications
| Mathematical Operating Characteristics
Inlet Flow Rate: qv = (Vg × n) / (1000 × ηv) [L/min] (qv = (Vg × n) / (231 × ηv) [GPM])
Output Speed: n = (qv × 1000 × ηv) / Vg [rpm] (n = (qv × 231 × ηv) / Vg [rpm])
Output Torque: T = (Vg × Δp × ηmh) / (20 × π) [Nm] (T = (Vg × Δp × ηmh) / (24 × π) [lb-ft])
Drive Power: P = (qv × Δp × ηt) / 600 [kW] (P = (T × n) / 5252 = (qv × Δp × ηt) / 1714 [HP])
| SAE Threaded Connection Port Specification
| Port Code | Port Function Description | Pressure Rating (pmax) | Applicable SAE Standard Port Thread | Operational Status |
|---|---|---|---|---|
| A, B | High-Pressure Working Lines | 5,800 psi nom / 6,500 psi peak | SAE J518 Code 62 Split Flange (UNC threads) | System main connections |
| T, T1, T2 | Housing Drain Ports | 90 psi (6 bar) abs | SAE 10 (7/8-14 UNF-2B) / SAE 12 (1 1/16-12 UN-2B) | Connect highest port to reservoir |
| X | Pilot Control Pressure Port | 1,450 psi (100 bar) | SAE 6 (9/16-18 UNF-2B) O-Ring Boss | Connected to pilot control line |
| G | Synchronous Control Port | 6,500 psi (450 bar) | SAE 6 (9/16-18 UNF-2B) O-Ring Boss | Plugged during normal operation |
| M1, M | Test Port for Control Pressure | 6,500 psi (450 bar) | SAE 6 (9/16-18 UNF-2B) O-Ring Boss | Diagnostic port (plugged) |
| MA, MB | Working Line Pressure Test Ports | 6,500 psi (450 bar) | SAE 6 (9/16-18 UNF-2B) O-Ring Boss | High-pressure diagnostic test point |
| U | Housing / Bearing Flushing Port | 90 psi (6 bar) | SAE 6 (9/16-18 UNF) or SAE 10 (7/8-14 UNF) | Flushing port for high-temperature duty |
| Replacement Splined Shaft Interface Matrix (ANSI B92.1a Class 5)
| Shaft Code | Spline Dimension & Tooth Configuration | Available Frame Sizes | Retention Face Thread | Pitch Diameter / Pressure Angle |
|---|---|---|---|---|
| S (Size 28) | 1" Diameter, 15 Teeth, 16/32 DP | HYHH6VM28 | 3/8-16 UNC-2B (18 mm deep) | 30° Flat root side fit |
| S (Sizes 55, 80) | 1 1/4" Diameter, 14 Teeth, 12/24 DP | HYHH6VM55, HYHH6VM80 | 1/2-13 UNC-2B (22 mm deep) | 30° Flat root side fit |
| S (Sizes 107, 140, 160) | 1 3/4" Diameter, 13 Teeth, 8/16 DP | HYHH6VM107, HYHH6VM140, HYHH6VM160 | 5/8-11 UNC-2B (25 mm deep) | 30° Flat root side fit |
| S (Sizes 200, 250) | 2" Diameter, 15 Teeth, 8/16 DP | HYHH6VM200, HYHH6VM250 | 5/8-11 UNC-2B (25 mm deep) | 30° Flat root side fit |
| Z / A (Optional) | DIN 5480 Splined Shaft Options (W25 to W50) | Sizes 28 to 250 upon request | Metric DIN 13 Center Bore | European standard replacement |
Technical Specifications of HENGYUHANG HYHH6VM Series (Series 63, SAE Drop-In)
4.1 Displacement, Rotational Speed, Flow, and Torque Ratings
| Technical Parameter | Unit | HYHH6VM28 | HYHH6VM55 | HYHH6VM80 | HYHH6VM107 | HYHH6VM140 | HYHH6VM160 | HYHH6VM200 | HYHH6VM250 |
|---|---|---|---|---|---|---|---|---|---|
| Max Displacement (Vgₘₐₓ) | in³/rev (cm³/rev) | 1.71 (28.1) | 3.34 (54.8) | 4.88 (80.0) | 6.53 (107.0) | 8.54 (140.0) | 9.76 (160.0) | 12.20 (200.0) | 15.25 (250.0) |
| Min Displacement (Vg min) | in³/rev (cm³/rev) | 0 (0 to 0.8 Vgₘₐₓ) | 0 (0 to 0.8 Vgₘₐₓ) | 0 (0 to 0.8 Vgₘₐₓ) | 0 (0 to 0.8 Vgₘₐₓ) | 0 (0 to 0.8 Vgₘₐₓ) | 0 (0 to 0.8 Vgₘₐₓ) | 0 (0 to 0.8 Vgₘₐₓ) | 0 (0 to 0.8 Vgₘₐₓ) |
| Intermediate Displacement (Vg,1) | in³/rev (cm³/rev) | 1.16 (19.0) | 2.26 (37.0) | 3.30 (54.0) | 4.33 (71.0) | 5.68 (93.0) | 6.53 (107.0) | 8.18 (134.0) | 11.59 (190.0) |
| Nominal Speed at Vgₘₐₓ (nₘₐₓ) | rpm | 5,300 | 4,200 | 3,750 | 3,300 | 3,150 | 3,000 | 2,750 | 2,500 |
| Intermittent Overspeed at Vgₘₐₓ | rpm | 5,850 | 4,600 | 4,100 | 3,650 | 3,450 | 3,300 | 3,000 | 2,500 |
| Max Permissible Speed (Vg<Vg,1) | rpm | 8,000 | 6,300 | 5,600 | 5,000 | 4,700 | 4,500 | 4,100 | 3,300 |
| Limit Overspeed at Vg=0 (nmax0) | rpm | 8,800 | 7,100 | 6,300 | 5,600 | 5,200 | 5,000 | 4,500 | 3,300 |
| Max Permissible Inflow (qV max) | GPM (L/min) | 39.4 (149) | 60.8 (230) | 79.3 (300) | 93.3 (353) | 116.5 (441) | 126.8 (480) | 145.3 (550) | 165.1 (625) |
| Max Output Torque (Δp=5,800 psi) | lb-ft (Nm) | 131.3 (178) | 256.7 (348) | 376.1 (510) | 500.8 (679) | 657.1 (891) | 749.3 (1,016) | 938.9 (1,273) | 1,025.9 (1,391) |
| Moment of Inertia (J) | lb-ft² (kg·m²) | 0.033 (0.0014) | 0.100 (0.0042) | 0.190 (0.0080) | 0.301 (0.0127) | 0.491 (0.0207) | 0.600 (0.0253) | 0.838 (0.0353) | 1.448 (0.0610) |
| Case Oil Volume (VV) | gal (L) | 0.13 (0.50) | 0.20 (0.75) | 0.32 (1.20) | 0.40 (1.50) | 0.48 (1.80) | 0.63 (2.40) | 0.71 (2.70) | 0.79 (3.00) |
| Dry Weight | lbs (kg) | 35.3 (16.0) | 57.3 (26.0) | 75.0 (34.0) | 103 (47.0) | 132 (60.0) | 141 (64.0) | 176 (80.0) | 198 (90.0) |
4.2 Operating Pressure Boundaries
| Pressure Parameter | Rated Value (English / Metric) | Operational Criteria & Limits |
|---|---|---|
| Nominal Pressure (p_N) | 5,800 psi (400 bar) | Maximum continuous operating pressure design limit |
| Maximum Peak Pressure (pₘₐₓ) | 6,500 psi (450 bar) | Single cycle duration ≤10 s; total operating accumulation ≤300 hours |
| Summation Pressure Limit (p_Su) | 10,000 psi (700 bar) | Sum of working pressures at Port A and Port B (p_A + p_B) |
| Minimum Pressure (High-Pressure Side) | 365 psi (25 bar) | Required minimum inlet pressure to prevent internal component liftoff |
| Housing Case Pressure (p_abs. max) | 90 psi (6 bar absolute) | Maximum allowable continuous shaft seal housing pressure |
| Short-Term Case Pressure Surge | 75 psi (5 bar differential) | Permissible transient case pressure load duration t<5 minutes |
4.3 Hydraulic Fluid Cleanliness & Viscosity Requirements
| Fluid Parameter | Standard Specification | Performance Guidelines |
|---|---|---|
| Standard Hydraulic Fluid | Petroleum base mineral oil per DIN 51524 | Compatible with environmentally acceptable (HF) fluids upon seal review |
| Optimum Operating Viscosity (νₒₚₜ) | 80 to 170 SUS (16 to 36 mm²/s) | Delivers maximum volumetric and overall mechanical efficiency |
| Minimum Viscosity Limit (νₘᵢₙ) | 42 SUS (5 mm²/s) | Short-term limit at maximum fluid temperature 240 ∘F (115 ∘C) |
| Maximum Cold Start Viscosity (νₘₐₓ) | 7,400 SUS (1,600 mm²/s) | Short-term startup limit at minimum temperature −40 ∘F (−40 ∘C) |
| Sealing System Material | FPM Fluorocarbon Rubber (Standard) | High-temperature and aggressive synthetic fluid resistance |
| Fluid Cleanliness Requirements | ISO/DIS 4406 Class 18/15 (NAS 1638 Class 9) | Required at 240 ∘F (115 ∘C): ISO 17/14 (NAS 1638 Class 8) |
Advantages
Full North American SAE Drop-In Compatibility
100% compliant with SAE 2-bolt and 4-bolt flange patterns, ANSI B92.1a involute splines, UNC port threads, and SAE UN O-ring boss ports, allowing immediate bolt-in substitution of Bosch Rexroth AA6VM Series 63 units with zero machine re-plumbing.
Heavy-Duty Bent-Axis Architecture
Proven spherical valve plate and tapered piston configuration achieve overall operating efficiencies exceeding 93%, withstanding harsh mobile shock loads up to 6,500 psi (450 bar).
Infinite 0-to-Max Swiveling Range
Stepless displacement control swivels completely down to zero (Vg=0), allowing mobile equipment to achieve maximum torque breakout at crawl speeds and rapid highway travel speeds without costly mechanical transmissions.
High High-Speed Overspeed Survivability
Tapered piston kinematics and low rotary inertia allow continuous rated speeds up to 5,300 rpm and limit overspeeds up to 8,800 rpm at zero displacement.
Comprehensive Control Versatility
Accommodates pilot-pressure hydraulic proportional control (HD1/HD2), electric proportional control (EP1/EP2), two-point hydraulic/electric shifting (HZ/EZ), automatic load-sensing control (HA1/HA2), and speed-dependent automatic travel control (DA).
Integrated Valve & Flushing Block Options
Fully supports factory-mounted low-pressure flushing and boost-pressure valves (230 psi / 16 bar fixed setting, up to 10 L/min flushing flow) and heavy-duty motion control counterbalance valves.
| 6. Cross Reference
6.1 Dimensional & Hydraulic Frame Mapping
| Rexroth Original Model | Max Displacement | Mounting Flange Standard | ANSI B92.1a Spline Shaft | High-Pressure Port Layout | HENGYUHANG Replacement Model |
|---|---|---|---|---|---|
| AA6VM28.../63 | 1.71 in³/rev (28.1 cm³) | SAE-B 2-bolt / ISO 100-4 | 1" 15T 16/32DP | SAE 3/4" Rear (51) / Side (52) | HYHH6VM28 |
| AA6VM55.../63 | 3.34 in³/rev (54.8 cm³) | SAE-C 2-bolt (Flange C) | 1 1/4" 14T 12/24DP (S) | SAE 3/4" Rear (51) / Side (52) | HYHH6VM55 |
| AA6VM80.../63 | 4.88 in³/rev (80.0 cm³) | SAE-C 2-bolt (Flange C) | 1 1/4" 14T 12/24DP (S) | SAE 1" Rear (51) / Side (52) | HYHH6VM80 |
| AA6VM107.../63 | 6.53 in³/rev (107.0 cm³) | SAE-D 4-bolt (Flange D) | 1 3/4" 13T 8/16DP (S) | SAE 1" Rear (51) / Side (52) | HYHH6VM107 |
| AA6VM140.../63 | 8.54 in³/rev (140.0 cm³) | SAE-D 4-bolt (Flange D) | 1 3/4" 13T 8/16DP (S) | SAE 1 1/4" Rear (51) / Side (52) | HYHH6VM140 |
| AA6VM160.../63 | 9.76 in³/rev (160.0 cm³) | SAE-D 4-bolt (Flange D) | 1 3/4" 13T 8/16DP (S) | SAE 1 1/4" Rear (51) / Side (52) | HYHH6VM160 |
| AA6VM200.../63 | 12.20 in³/rev (200.0 cm³) | SAE-E 4-bolt (Flange D) | 2" 15T 8/16DP (S) | SAE 1 1/4" Rear (51) / Side (52) | HYHH6VM200 |
| AA6VM250.../63 | 15.25 in³/rev (250.0 cm³) | SAE-E 4-bolt (Flange D) | 2" 15T 8/16DP (S) | SAE 1 1/4" Rear (51) / Side (52) | HYHH6VM250 |
6.2 Control Mechanism Functional Cross-Reference
| Control Code | Control Category | Actuation Characteristic | Machine Operational Role |
|---|---|---|---|
| HD1 / HD2 | Hydraulic Pilot Related | Pilot pressure increase Δp = 145 psi (10 bar) or 365 psi (25 bar) | Stepless displacement control from Vg min to Vg max |
| EP1 / EP2 | Electric Proportional | Solenoid proportional control (12 V / 24 V DC) | Microprocessor-managed stepless speed and torque adjustment |
| HZ / HZ1 | Hydraulic Two-Position | Negative pilot pressure switching | Rapid two-speed travel shifting (low speed turtle / high speed rabbit) |
| EZ1 / EZ2 | Electric Two-Position | On/Off switching solenoid (12 V / 24 V DC) | Instant push-button 2-speed travel drive shifting |
| HA1 / HA2 | Automatic High-Pressure | Self-regulating load sensing (starts at Vg min, swivels to Vg max) | Automatic torque boost when equipment encounters heavy tractive loads |
| DA1 / DA2 | Speed-Related Travel | Regulated by engine tachometric pressure with electric travel direction valve | Automotive-style travel drive with anti-stall engine pull-down protection |
| 7. Brand Replacement
Bosch Rexroth (Direct 1:1 replacement for AA6VM Series 63 North American SAE variable displacement motors)
Danfoss / Sauer-Danfoss (Series 51 and Series 51-1 SAE variable displacement motors)
Linde Hydraulics (HMV-02 Series variable motors with SAE mounting interfaces)
Parker Hannifin / Voac (V12 and V14 Series variable displacement bent-axis motors)
Eaton / Vickers variable displacement motors retrofitted upon technical request
| 8. Applications
Forestry Feller Bunchers & Skidders: Propel drive transmissions providing high low-speed stump pulling power and fast roading transit.
Wheeled Excavators & Backhoe Loaders: Hydrostatic travel drives mounted to powershift drop-boxes.
Rough-Terrain & Truck-Mounted Crane Winches: Smooth creeping speed for delicate crane positioning combined with rapid bare-cable winch take-up.
Horizontal Directional Drilling (HDD) Rigs: High-torque rotary head drill motors and carriage thrust drives.
Mining Tramming & Underground Loaders: Severe-duty all-wheel drive propulsion operating under extreme ambient conditions.
Marine Deck Winches & Towing Winches: High continuous holding torque with corrosion-resistant sealing configurations.
| 9. Packaging & Shipping
| Packaging Layer | Specification & Protective Material | Safety Level |
|---|---|---|
| Primary Shielding | Corrosion-inhibiting VCI plastic wrap, desiccants, and heavy-duty port thread plugs | Total protection against moisture, humidity, and atmospheric rust |
| Shock Absorption | Custom-molded high-density expanded polyethylene (EPE) foam cushioning enclosure | Absorbs multi-axis transit shocks and prevents damage to pilot spigots and splines |
| Outer Enclosure | ISPM-15 export-compliant non-fumigation engineered solid wooden crate | Heavy structural containment for international air, ocean, and multimodal cargo |
| Logistics Options | Express Courier (DHL, FedEx, UPS), International Air Cargo, Ocean LCL/FCL (DDP / CIF) | Standard configurations dispatched in 48–72 hours; end-to-end milestone tracking |
| 10. 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, spherical cylinder block faces, and bi-metal 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 5,800 psi rated duty and 6,500 psi 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 HYHH6VM motor undergoes mandatory, computer-controlled testing simulating real-world crane hoist and excavator 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 5,800 psi nominal and 6,500 psi 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 HD, HZ, EZ, and HA 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: Standard SAE 2-bolt and 4-bolt mounting flange pilot diameters (SAE-B, SAE-C, SAE-D, SAE-E), bolt circle PCDs, and pilot depths correspond 1:1 to original Bosch Rexroth AA6VM Series 63 specifications down to the millimeter.
Zero Piping or Chassis Rework: Standard rear SAE ports (Port Plate 51) and side opposite SAE ports (Port Plate 52) with UNC threads connect directly to existing high-pressure hose assemblies and gearbox brackets with zero pipe bending or adaptor refitting.
Drive Spline Conformity: Precision ANSI B92.1a involute splines (Shaft Code S) mesh seamlessly with OEM planetary gearboxes, winches, and reduction hubs 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 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 bent-axis rotary groups, precision bearing kits, and modular EZ/HZ/HA 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 HYHH6VM SAE Series 63
HENGYUHANG Axial Piston Variable Motor HYHH6VM SAE Series 63 is a heavy-duty, bent-axis variable displacement hydraulic motor engineered for open and closed hydrostatic transmission circuits in both mobile and industrial machinery. Conforming to North American SAE standards (SAE 2-bolt and 4-bolt mounting flanges, ANSI B92.1a splined drive shafts, and SAE Code 62 UN-threaded flange ports), the HYHH6VM Series 63 features spherical tapered piston rotary group technology delivering unmatched starting torque, exceptional mechanical-hydraulic efficiency, and approved high rotational speeds up to 8800 rpm. With an ultra-wide control range allowing infinitely variable displacement from maximum displacement (Vg max) all the way down to zero (Vg min = 0 cm³), the HYHH6VM motor enables maximum vehicle tractive effort combined with high roading speeds, eliminating multi-speed mechanical gearboxes and permitting the use of smaller main hydraulic pumps. The HYHH6VM SAE Series 63 serves as a direct, precision-engineered drop-in replacement for OEM Bosch Rexroth AA6VM SAE Series 63 motors across wheel loaders, forestry skidders, cranes, drilling equipment, and heavy industrial drives.
Key Technical & Operational Features
Robust Bent-Axis Rotary Group Architecture: Heavy-duty bent-axis cylinder block with spherical tapered pistons ensures superior mechanical starting efficiency, minimal boundary friction, and extended service life under continuous cyclic loading.
High Pressure Ratings: Rated for continuous nominal working pressure up to 5800 psi (400 bar) and peak maximum operating pressures up to 6500 psi (450 bar) across frame sizes 28 through 200 cm³/rev (5100 psi / 350 bar nominal on size 80 and sizes 250–1000).
Full SAE Interface Standardization: Built to SAE J744 / ISO 3019-1 mounting standards (SAE-B 2-bolt on size 28; SAE-C 2-bolt on sizes 55, 80; SAE-D 4-bolt on sizes 107, 160; SAE-E 4-bolt on sizes 200, 250) with ANSI B92.1a involute splined shafts.
Extreme Swivel Range with Zero-Displacement Capability: Steplessly adjustable displacement from Vg max down to Vg min = 0 cm³, permitting rapid hydrostatic freewheeling, overdrive travel speeds, and dynamic load balancing.
Cost-Saving Driveline Optimization: Wide displacement ratio eliminates secondary mechanical transfer gearboxes and allows downsized hydraulic primary pumps, significantly reducing vehicle curb weight and fuel consumption.
Approved for Extreme Rotational Speeds: Precision rotary balance permits continuous full-displacement operating speeds up to 5300 rpm and zero-swivel overspeed ratings up to 8800 rpm (size 28).
Low Unit Power & Low Rotary Inertia: Reduced mass moment of inertia ensures rapid dynamic acceleration, sharp braking response, and immediate swiveling reaction times.
Comprehensive Control Options: Available with hydraulic pilot pressure control (HD1, HD2), hydraulic two-position control (HZ, HZ1), electric proportional control (EP1, EP2), electric two-position control (EZ1, EZ2), automatic load-dependent high-pressure control (HA1, HA2), and speed-dependent automotive travel control (DA1–DA6).
Integrated Circuit Protection & Flushing: Optionally equipped with factory-mounted flushing and boost-pressure valves (fixed 230 psi / 16 bar) for closed-circuit thermal dissipation, plus port plates configured for direct mounting of motion control counterbalance valves.
Heavy-Duty Industrial & Mobile Applications
HENGYUHANG HYHH6VM SAE Series 63 variable displacement motors are extensively applied in mobile off-highway vehicles and industrial hydrostatic transmissions requiring high tractive torque at low speeds and high overspeed travel capability:
Earthmoving & Construction Equipment: Hydrostatic wheeled excavators, wheel loaders, compact tool carriers, motor graders, trenchers, and articulated dump trucks.
Forestry & Agricultural Machinery: Log skidders, feller bunchers, timber forwarders, high-clearance crop sprayers, sugar cane harvesters, and combine header drives.
Mobile Cranes & Marine Winches: High-speed hoisting winches for rough-terrain cranes, anchor handling tugger winches, oceanographic spooling reels, and marine deck capstans.
Mining & Heavy Drilling Systems: Underground coal haulers, continuous miners, tunnel blast hole drill power heads, rotary drilling carriages, and horizontal directional drill (HDD) rigs.
Technical Performance Matrix (OEM Benchmark Standard)
| Technical Parameter / Frame Size | Size 28 | Size 55 | Size 80 | Size 107 | Size 140 | Size 160 | Size 200 | Size 250 |
|---|---|---|---|---|---|---|---|---|
| Max Displacement Vg max [in³/rev / cm³/rev] | 1.71 / 28.1 | 3.34 / 54.8 | 4.88 / 80.0 | 6.53 / 107.0 | 8.54 / 140.0 | 9.76 / 160.0 | 12.20 / 200.0 | 15.25 / 250.0 |
| Min Displacement Vg min [in³/rev / cm³/rev] | 0 / 0 | 0 / 0 | 0 / 0 | 0 / 0 | 0 / 0 | 0 / 0 | 0 / 0 | 0 / 0 |
| Intermediate Swivel Displacement Vg,1 [cm³/rev] | 19.0 | 37.0 | 54.0 | 71.0 | 93.0 | 107.0 | 134.0 | 190.0 |
| Nominal Operating Pressure pN [psi / bar] | 5800 / 400 | 5800 / 400 | 5100 / 350 | 5800 / 400 | 5800 / 400 | 5800 / 400 | 5800 / 400 | 5100 / 350 |
| Maximum Peak Pressure pmax [psi / bar] | 6500 / 450 | 6500 / 450 | 5800 / 400 | 6500 / 450 | 6500 / 450 | 6500 / 450 | 6500 / 450 | 5800 / 400 |
| Max Continuous Speed at Vg max (nmax) [rpm] | 5300 | 4200 | 3750 | 3300 | 3150 | 3000 | 2750 | 2500 |
| Intermittent Max Speed at Vg max [rpm] | 5850 | 4600 | 4100 | 3650 | 3450 | 3300 | 3000 | 2500 |
| Max Speed at Intermediate Swivel Vg,1 [rpm] | 8000 | 6300 | 5600 | 5000 | 4700 | 4500 | 4100 | 3300 |
| Max Permissible Speed at Zero Swivel Vg=0 [rpm] | 8800 | 7100 | 6300 | 5600 | 5200 | 5000 | 4500 | 3300 |
| Max Permissible Inlet Flow qV max [gpm / L/min] | 39.4 / 149 | 60.8 / 230 | 79.3 / 300 | 93.3 / 353 | 116.5 / 441 | 126.8 / 480 | 145.3 / 550 | 165.1 / 625 |
| Torque Constant Tk at Vg max [lb-ft/psi / Nm/bar] | 0.023 / 0.45 | 0.044 / 0.87 | 0.065 / 1.27 | 0.086 / 1.70 | 0.113 / 2.23 | 0.129 / 2.54 | 0.162 / 3.18 | 0.202 / 3.98 |
| Max Theoretical Torque Tmax at Vg max [lb-ft / Nm] | 131 / 178 | 257 / 348 | 376 / 510 | 501 / 679 | 657 / 891 | 749 / 1016 | 939 / 1273 | 1026 / 1391 |
| Rotary Group Moment of Inertia J [lbs-ft² / kg·m²] | 0.033 / 0.0014 | 0.100 / 0.0042 | 0.190 / 0.0080 | 0.301 / 0.0127 | 0.491 / 0.0207 | 0.600 / 0.0253 | 0.838 / 0.0353 | 1.448 / 0.0610 |
| Housing Fluid Volume [US gal / L] | 0.13 / 0.50 | 0.20 / 0.75 | 0.32 / 1.20 | 0.40 / 1.50 | 0.48 / 1.80 | 0.63 / 2.40 | 0.71 / 2.70 | 0.79 / 3.00 |
| Dry Weight (Approximate) [lbs / kg] | 35.3 / 16.0 | 57.3 / 26.0 | 75.0 / 34.0 | 103 / 47.0 | 132 / 60.0 | 141 / 64.0 | 176 / 80.0 | 198 / 90.0 |
* Values apply within optimum operating viscosity range νopt = 80 to 170 SUS (16 to 36 mm²/s) with petroleum-based hydraulic fluids. Sum of pressures at working ports A and B must not exceed 10000 psi (700 bar). Continuous operation at zero displacement requires minimum low-pressure circuit charge boost.
Mechanical Installation Interface Specifications
Part 1: Standard SAE mounting flange dimensions (SAE 2-bolt and 4-bolt), centering pilot diameter, bolt clearance pattern, and ANSI B92.1a involute splined drive shafts.
| Frame Size (NG) | Mounting Flange Code | Centering Pilot Ø (SAE J744) | Bolt Hole Pitch & Pattern | Drive Shaft Code S (ANSI B92.1a) | Alternative Shaft (DIN 5480) |
|---|---|---|---|---|---|
| HYHH6VM028 | Code B (ISO 4-bolt) / Code C (SAE-B) | Ø3.937 in (Ø100 mm 0/-0.022 mm) | Pitch Ø4.92 in (125 mm) / 4x Ø11.0 mm | Code S: 1.0 in 15T 16/32DP (L=38 mm) | Code Z5: W25×1.25 / Code Z6: W30×2 |
| HYHH6VM055 | Code C (SAE-C 2-bolt) | Ø5.000 in (Ø127 mm 0/-0.050 mm) | Spacing 7.125 in (181 mm) / 2x Ø17.5 mm | Code S: 1 1/4 in 14T 12/24DP (L=48 mm) | Code Z6: W30×2 / Code Z8: W35×2 |
| HYHH6VM080 | Code C (SAE-C 2-bolt) | Ø5.000 in (Ø127 mm 0/-0.050 mm) | Spacing 7.125 in (181 mm) / 2x Ø17.5 mm | Code S: 1 1/4 in 14T 12/24DP (L=48 mm) | Code Z8: W35×2 / Code Z9: W40×2 |
| HYHH6VM107 | Code D (SAE-D 4-bolt) | Ø6.000 in (Ø152.4 mm 0/-0.050 mm) | Pitch Ø9.00 in (228.6 mm) / 4x Ø20.6 mm | Code S: 1 3/4 in 13T 8/16DP (L=67 mm) | Code Z9: W40×2 / Code A1: W45×2 |
| HYHH6VM140 | Code D (SAE-D 4-bolt) / Code B (ISO) | Ø7.087 in (Ø180 mm 0/-0.025 mm) | Pitch Ø8.82 in (224 mm) / 4x Ø17.5 mm | Code S: 1 3/4 in 13T 8/16DP (L=67 mm) | Code A1: W45×2 / Code Z9: W40×2 |
| HYHH6VM160 | Code D (SAE-D 4-bolt) | Ø6.000 in (Ø152.4 mm 0/-0.050 mm) | Pitch Ø9.00 in (228.6 mm) / 4x Ø20.6 mm | Code S: 1 3/4 in 13T 8/16DP (L=67 mm) | Code A1: W45×2 / Code A2: W50×2 |
| HYHH6VM200 | Code D (SAE-E 4-bolt) | Ø6.500 in (Ø165.1 mm 0/-0.050 mm) | Pitch Ø12.50 in (317.5 mm) / 4x Ø20.6 mm | Code S: 2.0 in 15T 8/16DP (L=67 mm) | Code A2: W50×2×24×9g |
| HYHH6VM250 | Code D (SAE-E 4-bolt) | Ø6.500 in (Ø165.1 mm 0/-0.050 mm) | Pitch Ø12.50 in (317.5 mm) / 4x Ø20.6 mm | Code S: 2.0 in 15T 8/16DP (L=67 mm) | Code A2: W50×2×24×9g |
Fluid Connection & Port Configuration Specifications
Part 2: Hydraulic fluid connections across working lines A/B (SAE Code 62 UN-threaded), case drain ports T, synchronous control G, bearing flushing U, pilot X, and gauge ports M1.
| Frame Size (NG) | Working Ports A & B (SAE Code 62) | Case Drain Ports T (SAE J514 / UN) | Synchronous Control Port G | Flushing Port U (Plugged) | Pilot Pressure Port X (HD, HZ) | Test Port M1 (Control Pressure) |
|---|---|---|---|---|---|---|
| HYHH6VM028 | SAE 3/4 in (3/8-16 UNC-2B, 21 mm deep) | SAE 10 (7/8-14 UNF-2B, 15 mm deep) | SAE 6 (9/16-18 UNF-2B, plugged) | SAE 8 (3/4-16 UNF-2B, plugged) | SAE 6 (9/16-18 UNF-2B, pmax 100 bar) | SAE 6 (9/16-18 UNF-2B, plugged) |
| HYHH6VM055 | SAE 3/4 in (3/8-16 UNC-2B, 21 mm deep) | SAE 12 (1 1/16-12 UN-2B, 20 mm deep) | SAE 6 (9/16-18 UNF-2B, plugged) | SAE 10 (7/8-14 UNF-2B, plugged) | SAE 6 (9/16-18 UNF-2B, pmax 100 bar) | SAE 6 (9/16-18 UNF-2B, plugged) |
| HYHH6VM080 | SAE 1.0 in (7/16-14 UNC-2B, 22 mm deep) | SAE 12 (1 1/16-12 UN-2B, 20 mm deep) | SAE 6 (9/16-18 UNF-2B, plugged) | SAE 10 (7/8-14 UNF-2B, plugged) | SAE 6 (9/16-18 UNF-2B, pmax 100 bar) | SAE 6 (9/16-18 UNF-2B, plugged) |
| HYHH6VM107 | SAE 1.0 in (7/16-14 UNC-2B, 22 mm deep) | SAE 12 (1 1/16-12 UN-2B, 20 mm deep) | SAE 6 (9/16-18 UNF-2B, plugged) | SAE 10 (7/8-14 UNF-2B, plugged) | SAE 6 (9/16-18 UNF-2B, pmax 100 bar) | SAE 6 (9/16-18 UNF-2B, plugged) |
| HYHH6VM140 | SAE 1 1/4 in (1/2-13 UNC-2B, 19 mm deep) | SAE 12 (1 1/16-12 UN-2B, 20 mm deep) | SAE 6 (9/16-18 UNF-2B, plugged) | SAE 10 (7/8-14 UNF-2B, plugged) | SAE 6 (9/16-18 UNF-2B, pmax 100 bar) | SAE 6 (9/16-18 UNF-2B, plugged) |
| HYHH6VM160 | SAE 1 1/4 in (1/2-13 UNC-2B, 19 mm deep) | SAE 12 (1 1/16-12 UN-2B, 20 mm deep) | SAE 6 (9/16-18 UNF-2B, plugged) | SAE 10 (7/8-14 UNF-2B, plugged) | SAE 6 (9/16-18 UNF-2B, pmax 100 bar) | SAE 6 (9/16-18 UNF-2B, plugged) |
| HYHH6VM200 | SAE 1 1/4 in (1/2-13 UNC-2B, 19 mm deep) | SAE 12 (1 1/16-12 UN-2B, 20 mm deep) | SAE 6 (9/16-18 UNF-2B, plugged) | SAE 10 (7/8-14 UNF-2B, plugged) | SAE 6 (9/16-18 UNF-2B, pmax 100 bar) | SAE 6 (9/16-18 UNF-2B, plugged) |
| HYHH6VM250 | SAE 1 1/4 in (1/2-13 UNC-2B, 19 mm deep) | T1, T2: SAE 10 (7/8-14 UNF-2B) | SAE 6 (9/16-18 UNF-2B, plugged) | SAE 6 (9/16-18 UNF-2B, plugged) | SAE 6 (9/16-18 UNF-2B, pmax 100 bar) | M: SAE 6 / MA, MB: SAE 6 |
Comprehensive Control Devices & Operating Characteristics
| Control Code | Operating Mode & Actuation | Functional Characteristics & Circuit Dynamics |
|---|---|---|
| HD1 / HD2 HD1D / HD2D HD1G / HD2G | Hydraulic Control, Pilot Pressure Related (Proportional Stepless) | Displacement varies steplessly in direct proportion to hydraulic pilot pressure applied at port X. HD1 features a control pressure increase of Δp = 145 psi (10 bar); HD2 features Δp = 365 psi (25 bar). Standard version starts control at Vg max (maximum torque) and down-swivels towards Vg min with rising pilot pressure. Versions D and G incorporate direct or remote constant pressure override. |
| HZ / HZ1 HZ3 | Hydraulic Two-Position Control (Two-Point Fast Switching) | Two-point displacement switching motor: rest position held at Vg max by spring force (maximum gradeability and digging torque). Applying pilot pressure pX ≥ 145–260 psi (10–18 bar) to port X rapidly swivels the motor to Vg min for high-speed travel. Venting port X returns the motor instantly to Vg max. |
| EP1 / EP2 EP1D / EP2D EP1G / EP2G | Electrical Proportional Control (12V / 24V DC Solenoid) | Displacement is steplessly and proportionally adjusted via electrical input current to a proportional solenoid. Control voltage available in 12V DC (EP1) or 24V DC (EP2). Solenoid is 100% duty-cycle rated with IP67 sealing. Versions D and G combine proportional displacement control with constant pressure override. |
| EZ1 / EZ2 EZ3 / EZ4 | Electrical Two-Position Control (12V / 24V Switching Solenoid) | On/off two-point electronic displacement control without requiring separate hydraulic pilot plumbing. De-energized solenoid = Vg max (high torque, low speed); Energized solenoid = Vg min (high speed travel mode). EZ1/EZ3 operate on 12V DC; EZ2/EZ4 operate on 24V DC. |
| HA1 / HA2 HA1T / HA2T | Automatic High-Pressure Control (Load-Dependent Swiveling) | Load-sensing automatic down-swiveling: the motor remains at Vg min until high-pressure system resistance reaches the pre-adjusted cracking threshold (80 to 300 bar), then automatically swivels out towards Vg max to provide torque multiplication. HA1 operates with minimal pressure increase; HA2 features a pressure differential Δp = 1450 psi (100 bar) for smooth traction. Available with hydraulic override T. |
| DA1 / DA2 / DA3 DA4 / DA5 / DA6 | Hydraulic Speed-Related Control (Automotive Hydrostat Transmission) | Speed-sensing negative control governed by engine speed pilot pressure from an A4VG/DA pump (pilot ratios 5/100 or 8/100). Includes integrated hydraulic (DA1, DA4) or electric (DA2, DA3, DA5, DA6) travel direction valves and electric Vg max override for true automotive pedal feel. |
HENGYUHANG HYHH6VM SAE Series 63 Ordering Code Structure
| Pos. | Code Segment | Available Options | Description & Engineering Specifications |
|---|---|---|---|
| 01 | Axial Piston Unit | HYHH6V HYH6V | Bent-axis variable displacement hydraulic motor, SAE North American version (HYHH6V) Bent-axis variable displacement hydraulic motor, ISO metric version (HYH6V) |
| 02 | Drive Shaft Bearings | Omitted L | Standard heavy-duty mechanical tapered roller bearings (sizes 28–200) Long-life bearing assembly for water-based HF fluids and extended durability (sizes 250–1000) |
| 03 | Mode of Operation | M | Motor, open and closed hydrostatic circuits |
| 04 | Nominal Size (NG) | 028 to 250 | Displacement: 28, 55, 80, 107, 140, 160, 200, 250 cm³/rev (larger sizes 355, 500, 1000 on request) |
| 05 | Control Devices | HD1 / HD2 HZ / HZ1 EP1 / EP2 EZ1 / EZ2 HA1 / HA2 DA1 to DA6 | Hydraulic control pilot pressure related (Δp = 145 psi / 365 psi) Hydraulic two-position control (pilot pressure switched) Electric proportional control (12V DC / 24V DC) Electric two-position control with switching solenoid (12V DC / 24V DC) Automatic high-pressure related control (without / with pressure increase) Speed-dependent automotive control with travel direction valves |
| 06 | Series Index | 63 | Series 6, Index 3 (SAE standard heavy-duty design) |
| 07 | Direction of Rotation | W | Bi-directional (reversible, viewed on drive shaft) |
| 08 | Displacement Setting | Omitted 1 2 | Standard stop: Vg min = 0 to 0.8 Vg max, Vg max fixed (sizes 28–200) Setting range 1: Vg min = 0 to 0.4 Vg max, Vg max = Vg max to 0.8 Vg max (sizes 250–1000) Setting range 2: Vg min = 0.4 to 0.8 Vg max, Vg max = Vg max to 0.8 Vg max (sizes 250–1000) |
| 09 | Sealing Material | P V | NBR (nitrile rubber) seals, shaft seal in FKM FKM (fluorocarbon / Viton seals, recommended for high temperature and phosphate ester) |
| 10 | Drive Shaft Code | S A / Z P | SAE splined shaft ANSI B92.1a (standard for AA6VM) Splined shaft DIN 5480 (standard for metric A6VM) Parallel keyed shaft DIN 6885 |
| 11 | Mounting Flange | C D B | SAE 2-bolt mounting flange (SAE-B on size 28; SAE-C on sizes 55, 80) SAE 4-bolt mounting flange (SAE-D on sizes 107, 160; SAE-E on sizes 200, 250) ISO 4-bolt mounting flange (standard for metric A6VM) |
| 12 | Working Ports A & B | 510 / 517 520 / 527 580 / 588 370 / 380 | SAE working ports at rear end, UN threads (without / with flushing valve) SAE working ports lateral on opposite sides, UN threads (without / with flushing valve) Port plate configured for mounting motion control counterbalance valve (rear / lateral) Port plate with integrated pressure relief valves for motion control valve mounting |
| 13 | Valves & Flushing | 0 7 8 | Without valve block With mounted flushing and boost-pressure valve (calibrated 0.9 to 6.6 gpm / 3.5 to 25 L/min) With built-on motion control counterbalance valve |
| 14 | Speed Sensor / Swivel | Omitted D V / E | Standard execution without speed sensor or indicator Prepared for inductive speed sensor (with toothed collar on rotary group) Equipped with optical swivel angle pin indicator (V) / Electronic angle sensor (E) |
Example Standard Order Code: HYHH6VM107HD1/63W-VSD520 (Size 107 cm³, HD1 Hydraulic Pilot Control, Series 63, Bi-directional, Viton Seals, SAE 1 3/4" Splined Shaft, SAE-D 4-Bolt Flange, Lateral SAE 1" Ports with UN Threads).
Direct Interchangeability & OEM Cross-Reference Matrix
HENGYUHANG HYHH6VM SAE Series 63 variable displacement hydraulic motors are 100% physically, dimensionally, and hydraulically interchangeable with OEM Bosch Rexroth AA6VM SAE Series 63 units, directly matching SAE pilots, ANSI splines, UN port threads, and control curves:
| OEM Rexroth Model Code | HENGYUHANG Replacement Code | Displacement & Flange | Control Option | Shaft & Ports | Interchangeability |
|---|---|---|---|---|---|
| AA6VM 28 HZ1 /63W-VSC510 | HYHH6VM 28 HZ1 /63W-VSC510 | 28 cm³, SAE-B 2-Bolt | HZ1 Hyd. Two-Position | SAE 1.0" 15T, Rear SAE 3/4" | 100% Drop-In |
| AA6VM 55 HD1 /63W-VSC520 | HYHH6VM 55 HD1 /63W-VSC520 | 55 cm³, SAE-C 2-Bolt | HD1 Hyd. Pilot (10 bar) | SAE 1 1/4" 14T, Side SAE 3/4" | 100% Drop-In |
| AA6VM 55 EP2 /63W-VSC527 | HYHH6VM 55 EP2 /63W-VSC527 | 55 cm³, SAE-C 2-Bolt | EP2 24V Prop. Solenoid | SAE 1 1/4" 14T, Flushing Valve | 100% Drop-In |
| AA6VM 80 HD2 /63W-VSC510 | HYHH6VM 80 HD2 /63W-VSC510 | 80 cm³, SAE-C 2-Bolt | HD2 Hyd. Pilot (25 bar) | SAE 1 1/4" 14T, Rear SAE 1" | 100% Drop-In |
| AA6VM 80 HA1T /63W-VSC520 | HYHH6VM 80 HA1T /63W-VSC520 | 80 cm³, SAE-C 2-Bolt | HA1T Automatic + Override | SAE 1 1/4" 14T, Side SAE 1" | 100% Drop-In |
| AA6VM 107 HD1 /63W-VSD520 | HYHH6VM 107 HD1 /63W-VSD520 | 107 cm³, SAE-D 4-Bolt | HD1 Hyd. Pilot (10 bar) | SAE 1 3/4" 13T, Side SAE 1" | 100% Drop-In |
| AA6VM 107 EZ2 /63W-VSD510 | HYHH6VM 107 EZ2 /63W-VSD510 | 107 cm³, SAE-D 4-Bolt | EZ2 24V Solenoid Switch | SAE 1 3/4" 13T, Rear SAE 1" | 100% Drop-In |
| AA6VM 140 HZ1 /63W-VSD520 | HYHH6VM 140 HZ1 /63W-VSD520 | 140 cm³, SAE-D 4-Bolt | HZ1 Hyd. Two-Position | SAE 1 3/4" 13T, Side SAE 1 1/4" | 100% Drop-In |
| AA6VM 160 HD1 /63W-VSD520 | HYHH6VM 160 HD1 /63W-VSD520 | 160 cm³, SAE-D 4-Bolt | HD1 Hyd. Pilot (10 bar) | SAE 1 3/4" 13T, Side SAE 1 1/4" | 100% Drop-In |
| AA6VM 160 EP2 /63W-VSD527 | HYHH6VM 160 EP2 /63W-VSD527 | 160 cm³, SAE-D 4-Bolt | EP2 24V Prop. Solenoid | SAE 1 3/4" 13T, Flushing Valve | 100% Drop-In |
| AA6VM 200 HD2 /63W-VSD520 | HYHH6VM 200 HD2 /63W-VSD520 | 200 cm³, SAE-E 4-Bolt | HD2 Hyd. Pilot (25 bar) | SAE 2.0" 15T, Side SAE 1 1/4" | 100% Drop-In |
| AA6VM 250 HD1 /63W-VSD520 | HYHH6VM 250 HD1 /63W-VSD520 | 250 cm³, SAE-E 4-Bolt | HD1 Hyd. Pilot (10 bar) | SAE 2.0" 15T, Side SAE 1 1/4" | 100% Drop-In |
Hydraulic Commissioning & Installation Guidelines
1. Initial Priming & Case Deaeration: Before operating the motor, the housing must be completely filled with filtered hydraulic oil via the highest drain port (T) and thoroughly vented. Operating with an empty or partially dry motor casing causes instantaneous boundary friction and catastrophic failure of the drive shaft bearings and spherical piston assembly.
2. Case Drain Pressure Limitations: The case drain line must be routed directly back to the reservoir without check valves or excessive pipe restrictions. Maximum continuous housing pressure must not exceed 30 psi / 2.0 bar abs (maximum surge peak limit ≤ 90 psi / 6.0 bar abs for sizes 28–200; ≤ 60 psi / 4.0 bar abs for sizes 250–1000). Elevated case drain pressure damages the FKM radial shaft seal and shifts the start-of-control calibration on HD, HA, and DA regulators.
3. Low-Pressure Cavitation Prevention at Zero Swivel: When the motor is swiveled towards zero displacement (Vg min = 0 cm³) during vehicle descent, high-speed overrunning, or winch lowering, adequate low-pressure boost (pabs ≥ 145–200 psi / 10–14 bar) must be continuously maintained at the inlet working port to prevent cavitation, piston slipper lift-off, and mechanical separation.
4. Fluid Cleanliness & Temperature Control: Maintain fluid cleanliness according to ISO 4406 Class 18/15 (NAS 1638 Class 9) or cleaner. Maximum permissible leakage oil temperature must not exceed 240 °F (115 °C) for sizes 28–200, or 195 °F (90 °C) for sizes 250–1000. In closed circuits with continuous high-duty cycles, install a flushing and boost-pressure valve (port plate option 7) to continuously discharge heated oil to the oil cooler.
5. Radial Shaft Loading Precautions: When driving via pulleys, sprockets, or pinions that exert radial forces on the drive shaft, ensure radial load direction aligns with optimal force angle (ϕopt = 45° to 70°) and observe derated nominal operating pressures where applicable.
Data Verification & Technical Notes
Reference Benchmark Datasheet: Bosch Rexroth AG Technical Datasheet RA 91 604/08.97 (Replaces RA 91604/07.95, RA 91603/05.95), Pages 1–35 (Variable Displacement Motor AA6VM / A6VM Series 63).
Quality Guarantee & Dynamic Testing: Every HENGYUHANG HYHH6VM SAE Series 63 motor undergoes computerized dynamic test-bench evaluation for full displacement swiveling response, high-speed stability up to 8000+ rpm, volumetric efficiency, starting torque, and case leakage under 5800 psi nominal and 6500 psi peak pressures prior to dispatch.
Custom Engineering & Modifications: HENGYUHANG provides custom displacement stop limits (fixed Vg min stop screws), special ANSI splines, optical or electronic swivel angle sensors (V, E), inductive speed sensor preparations (D), and custom counterbalance valve blocks tailored to specific machine serial numbers.
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Technical Performance Matrix (OEM Benchmark Standard)
| Technical Parameter / Frame Size | Size 28 | Size 55 | Size 80 | Size 107 | Size 140 | Size 160 | Size 200 | Size 250 |
|---|---|---|---|---|---|---|---|---|
| Max Displacement Vg max [in³/rev / cm³/rev] | 1.71 / 28.1 | 3.34 / 54.8 | 4.88 / 80.0 | 6.53 / 107.0 | 8.54 / 140.0 | 9.76 / 160.0 | 12.20 / 200.0 | 15.25 / 250.0 |
| Min Displacement Vg min [in³/rev / cm³/rev] | 0 / 0 | 0 / 0 | 0 / 0 | 0 / 0 | 0 / 0 | 0 / 0 | 0 / 0 | 0 / 0 |
| Intermediate Swivel Displacement Vg,1 [cm³/rev] | 19.0 | 37.0 | 54.0 | 71.0 | 93.0 | 107.0 | 134.0 | 190.0 |
| Nominal Operating Pressure pN [psi / bar] | 5800 / 400 | 5800 / 400 | 5100 / 350 | 5800 / 400 | 5800 / 400 | 5800 / 400 | 5800 / 400 | 5100 / 350 |
| Maximum Peak Pressure pmax [psi / bar] | 6500 / 450 | 6500 / 450 | 5800 / 400 | 6500 / 450 | 6500 / 450 | 6500 / 450 | 6500 / 450 | 5800 / 400 |
| Max Continuous Speed at Vg max (nmax) [rpm] | 5300 | 4200 | 3750 | 3300 | 3150 | 3000 | 2750 | 2500 |
| Intermittent Max Speed at Vg max [rpm] | 5850 | 4600 | 4100 | 3650 | 3450 | 3300 | 3000 | 2500 |
| Max Speed at Intermediate Swivel Vg,1 [rpm] | 8000 | 6300 | 5600 | 5000 | 4700 | 4500 | 4100 | 3300 |
| Max Permissible Speed at Zero Swivel Vg=0 [rpm] | 8800 | 7100 | 6300 | 5600 | 5200 | 5000 | 4500 | 3300 |
| Max Permissible Inlet Flow qV max [gpm / L/min] | 39.4 / 149 | 60.8 / 230 | 79.3 / 300 | 93.3 / 353 | 116.5 / 441 | 126.8 / 480 | 145.3 / 550 | 165.1 / 625 |
| Torque Constant Tk at Vg max [lb-ft/psi / Nm/bar] | 0.023 / 0.45 | 0.044 / 0.87 | 0.065 / 1.27 | 0.086 / 1.70 | 0.113 / 2.23 | 0.129 / 2.54 | 0.162 / 3.18 | 0.202 / 3.98 |
| Max Theoretical Torque Tmax at Vg max [lb-ft / Nm] | 131 / 178 | 257 / 348 | 376 / 510 | 501 / 679 | 657 / 891 | 749 / 1016 | 939 / 1273 | 1026 / 1391 |
| Rotary Group Moment of Inertia J [lbs-ft² / kg·m²] | 0.033 / 0.0014 | 0.100 / 0.0042 | 0.190 / 0.0080 | 0.301 / 0.0127 | 0.491 / 0.0207 | 0.600 / 0.0253 | 0.838 / 0.0353 | 1.448 / 0.0610 |
| Housing Fluid Volume [US gal / L] | 0.13 / 0.50 | 0.20 / 0.75 | 0.32 / 1.20 | 0.40 / 1.50 | 0.48 / 1.80 | 0.63 / 2.40 | 0.71 / 2.70 | 0.79 / 3.00 |
| Dry Weight (Approximate) [lbs / kg] | 35.3 / 16.0 | 57.3 / 26.0 | 75.0 / 34.0 | 103 / 47.0 | 132 / 60.0 | 141 / 64.0 | 176 / 80.0 | 198 / 90.0 |
| Pos. | Code Segment | Available Options | Description & Engineering Specifications |
|---|---|---|---|
| 01 | Axial Piston Unit | HYHH6V HYH6V | Bent-axis variable displacement hydraulic motor, SAE North American version (HYHH6V) Bent-axis variable displacement hydraulic motor, ISO metric version (HYH6V) |
| 02 | Drive Shaft Bearings | Omitted L | Standard heavy-duty mechanical tapered roller bearings (sizes 28–200) Long-life bearing assembly for water-based HF fluids and extended durability (sizes 250–1000) |
| 03 | Mode of Operation | M | Motor, open and closed hydrostatic circuits |
| 04 | Nominal Size (NG) | 028 to 250 | Displacement: 28, 55, 80, 107, 140, 160, 200, 250 cm³/rev (larger sizes 355, 500, 1000 on request) |
| 05 | Control Devices | HD1 / HD2 HZ / HZ1 EP1 / EP2 EZ1 / EZ2 HA1 / HA2 DA1 to DA6 | Hydraulic control pilot pressure related (Δp = 145 psi / 365 psi) Hydraulic two-position control (pilot pressure switched) Electric proportional control (12V DC / 24V DC) Electric two-position control with switching solenoid (12V DC / 24V DC) Automatic high-pressure related control (without / with pressure increase) Speed-dependent automotive control with travel direction valves |
| 06 | Series Index | 63 | Series 6, Index 3 (SAE standard heavy-duty design) |
| 07 | Direction of Rotation | W | Bi-directional (reversible, viewed on drive shaft) |
| 08 | Displacement Setting | Omitted 1 2 | Standard stop: Vg min = 0 to 0.8 Vg max, Vg max fixed (sizes 28–200) Setting range 1: Vg min = 0 to 0.4 Vg max, Vg max = Vg max to 0.8 Vg max (sizes 250–1000) Setting range 2: Vg min = 0.4 to 0.8 Vg max, Vg max = Vg max to 0.8 Vg max (sizes 250–1000) |
| 09 | Sealing Material | P V | NBR (nitrile rubber) seals, shaft seal in FKM FKM (fluorocarbon / Viton seals, recommended for high temperature and phosphate ester) |
| 10 | Drive Shaft Code | S A / Z P | SAE splined shaft ANSI B92.1a (standard for AA6VM) Splined shaft DIN 5480 (standard for metric A6VM) Parallel keyed shaft DIN 6885 |
| 11 | Mounting Flange | C D B | SAE 2-bolt mounting flange (SAE-B on size 28; SAE-C on sizes 55, 80) SAE 4-bolt mounting flange (SAE-D on sizes 107, 160; SAE-E on sizes 200, 250) ISO 4-bolt mounting flange (standard for metric A6VM) |
| 12 | Working Ports A & B | 510 / 517 520 / 527 580 / 588 370 / 380 | SAE working ports at rear end, UN threads (without / with flushing valve) SAE working ports lateral on opposite sides, UN threads (without / with flushing valve) Port plate configured for mounting motion control counterbalance valve (rear / lateral) Port plate with integrated pressure relief valves for motion control valve mounting |
| 13 | Valves & Flushing | 0 7 8 | Without valve block With mounted flushing and boost-pressure valve (calibrated 0.9 to 6.6 gpm / 3.5 to 25 L/min) With built-on motion control counterbalance valve |
| 14 | Speed Sensor / Swivel | Omitted D V / E | Standard execution without speed sensor or indicator Prepared for inductive speed sensor (with toothed collar on rotary group) Equipped with optical swivel angle pin indicator (V) / Electronic angle sensor (E) |
Example Standard Order Code: HYHH6VM107HD1/63W-VSD520 (Size 107 cm³, HD1 Hydraulic Pilot Control, Series 63, Bi-directional, Viton Seals, SAE 1 3/4" Splined Shaft, SAE-D 4-Bolt Flange, Lateral SAE 1" Ports with UN Threads).
Direct Interchangeability & OEM Cross-Reference Matrix
HENGYUHANG HYHH6VM SAE Series 63 variable displacement hydraulic motors are 100% physically, dimensionally, and hydraulically interchangeable with OEM Bosch Rexroth AA6VM SAE Series 63 units, directly matching SAE pilots, ANSI splines, UN port threads, and control curves:
| OEM Rexroth Model Code | HENGYUHANG Replacement Code | Displacement & Flange | Control Option | Shaft & Ports | Interchangeability |
|---|---|---|---|---|---|
| AA6VM 28 HZ1 /63W-VSC510 | HYHH6VM 28 HZ1 /63W-VSC510 | 28 cm³, SAE-B 2-Bolt | HZ1 Hyd. Two-Position | SAE 1.0" 15T, Rear SAE 3/4" | 100% Drop-In |
| AA6VM 55 HD1 /63W-VSC520 | HYHH6VM 55 HD1 /63W-VSC520 | 55 cm³, SAE-C 2-Bolt | HD1 Hyd. Pilot (10 bar) | SAE 1 1/4" 14T, Side SAE 3/4" | 100% Drop-In |
| AA6VM 55 EP2 /63W-VSC527 | HYHH6VM 55 EP2 /63W-VSC527 | 55 cm³, SAE-C 2-Bolt | EP2 24V Prop. Solenoid | SAE 1 1/4" 14T, Flushing Valve | 100% Drop-In |
| AA6VM 80 HD2 /63W-VSC510 | HYHH6VM 80 HD2 /63W-VSC510 | 80 cm³, SAE-C 2-Bolt | HD2 Hyd. Pilot (25 bar) | SAE 1 1/4" 14T, Rear SAE 1" | 100% Drop-In |
| AA6VM 80 HA1T /63W-VSC520 | HYHH6VM 80 HA1T /63W-VSC520 | 80 cm³, SAE-C 2-Bolt | HA1T Automatic + Override | SAE 1 1/4" 14T, Side SAE 1" | 100% Drop-In |
| AA6VM 107 HD1 /63W-VSD520 | HYHH6VM 107 HD1 /63W-VSD520 | 107 cm³, SAE-D 4-Bolt | HD1 Hyd. Pilot (10 bar) | SAE 1 3/4" 13T, Side SAE 1" | 100% Drop-In |
| AA6VM 107 EZ2 /63W-VSD510 | HYHH6VM 107 EZ2 /63W-VSD510 | 107 cm³, SAE-D 4-Bolt | EZ2 24V Solenoid Switch | SAE 1 3/4" 13T, Rear SAE 1" | 100% Drop-In |
| AA6VM 140 HZ1 /63W-VSD520 | HYHH6VM 140 HZ1 /63W-VSD520 | 140 cm³, SAE-D 4-Bolt | HZ1 Hyd. Two-Position | SAE 1 3/4" 13T, Side SAE 1 1/4" | 100% Drop-In |
| AA6VM 160 HD1 /63W-VSD520 | HYHH6VM 160 HD1 /63W-VSD520 | 160 cm³, SAE-D 4-Bolt | HD1 Hyd. Pilot (10 bar) | SAE 1 3/4" 13T, Side SAE 1 1/4" | 100% Drop-In |
| AA6VM 160 EP2 /63W-VSD527 | HYHH6VM 160 EP2 /63W-VSD527 | 160 cm³, SAE-D 4-Bolt | EP2 24V Prop. Solenoid | SAE 1 3/4" 13T, Flushing Valve | 100% Drop-In |
| AA6VM 200 HD2 /63W-VSD520 | HYHH6VM 200 HD2 /63W-VSD520 | 200 cm³, SAE-E 4-Bolt | HD2 Hyd. Pilot (25 bar) | SAE 2.0" 15T, Side SAE 1 1/4" | 100% Drop-In |
| AA6VM 250 HD1 /63W-VSD520 | HYHH6VM 250 HD1 /63W-VSD520 | 250 cm³, SAE-E 4-Bolt | HD1 Hyd. Pilot (10 bar) | SAE 2.0" 15T, Side SAE 1 1/4" | 100% Drop-In |
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