Piston Motors
HENGYUHANG HYH2FM Series 6x Axial Piston Fixed Motor
Engineered with heavy-duty bent-axis rotary group technology and high-rigidity ISO mounting flanges, the HENGYUHANG HYH2FM Series 6x axial piston fixed motor delivers up to 450 bar peak pressure, exceptional starting efficiency, and direct 1:1 drop-in interchangeability for open and closed circuit hydrostatic drivelines.
| Applications
Designed for severe-duty mobile and industrial drive applications, the HYH2FM series powers excavator swing and slew drives, crane hoisting and auxiliary winches, rotary drilling rig power heads, forestry processing heads, marine deck machinery, and municipal sweepers. Its high power density and optimized starting torque ensure smooth, jerk-free acceleration under heavy inertia loads.
| Key Technical Specifications
Product Model: HYH2FM Series 6x (Sizes 5, 10, 12, 16, 23, 28, 32, 107, 125, 160, 180, 200, 250, 355, 500, 710, 1000)
Brand Replacement: Bosch Rexroth A2FM Series 6x (OEM or tailored as requested)
Displacement: Fixed 4.93 to 1000 cm³/rev (17 standard frame sizes)
Rotation Direction: Bi-directional / Reversible (Viewed on drive shaft: W)
Speed Range: Up to 10,000 rpm nominal (Size 5) / up to 11,000 rpm intermittent; 1,600 to 8,000 rpm across primary industrial sizes
Peak Pressure: Nominal p nom = 315 to 400 bar (4,550 to 5,800 psi); Maximum peak p max = 350 to 450 bar (5,100 to 6,500 psi)
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| Overview of HENGYUHANG HYH2FM Series 6x Hydraulic Motors
The HENGYUHANG HYH2FM Series 6x is an all-purpose axial piston fixed displacement motor utilizing a proven bent-axis rotary group design for hydrostatic transmissions in open and closed circuits. With a comprehensive displacement range spanning from 4.93 cm³/rev up to 1000 cm³/rev, the motor delivers exceptional volumetric efficiency, superior starting torque characteristics, and high continuous power density within a compact, vibration-resistant envelope. Featuring heavy-duty tapered roller bearings and optimized spherical valve plate timing, the HYH2FM series withstands extreme mechanical shocks, dynamic pressure spikes, and high external radial drive forces. The motor is available with standard ISO 4-bolt and 8-bolt mounting flanges, DIN 5480 splined shafts, cylindrical keyed shafts, and diverse porting options including rear and side SAE split-flange and metric threaded ports.
| Dimension of HENGYUHANG HYH2FM Series 6x Hydraulic Motors
| Mechanical ISO Mounting Interface Specifications
| Frame Size & Series | Mounting Flange Standard (ISO 3019-2) | Pilot Centering Spigot (∅) |
|---|---|---|
| HYH2FM5 | ISO 60-4 (Special) | ∅60 −0.046/0 mm |
| HYH2FM10–16 | ISO 80-4 | ∅80 −0.019/0 mm |
| HYH2FM23–32 | ISO 100-4 | ∅100 −0.022/0 mm |
| HYH2FM107–125 | ISO 160-4 | ∅160 −0.025/0 mm |
| HYH2FM160–180 | ISO 180-4 | ∅180 −0.025/0 mm |
| HYH2FM200 | ISO 200-4 | ∅200 −0.029/0 mm |
| HYH2FM250 | ISO 224-4 | ∅224 −0.072/0 mm |
| HYH2FM355–500 | ISO 355/500 (8-bolt H) | ∅280 mm / ∅315 mm |
| HYH2FM710–1000 | ISO 710/1000 (8-bolt H) | Heavy-duty industrial spigot |
| Frame Size & Series | Fastening Pitch Circle (PCD) / Bolt Holes | Standard DIN 5480 Splined Shaft | Standard Parallel Keyed Shaft (DIN 6885) | Working Port Standard (SAE / Thread) |
|---|---|---|---|---|
| HYH2FM5 | ∅75 mm / 4× ∅6.4 mm | — (Conical Shaft C: ∅12.8) | ∅12 mm, A4×4×20 (Shaft B) | M18×1.5 Threaded Ports |
| HYH2FM10–16 | ∅100 mm / 4× ∅9 mm | W20×1.25 (Z) / W25×1.25 (A) | ∅20 mm (P) / ∅25 mm (B) | M22×1.5 (Port Plate 03/04) |
| HYH2FM23–32 | ∅125 mm / 4× ∅11 mm | W25×1.25 (Z) / W30×2 (A) | ∅25 mm (P) / ∅30 mm (B) | SAE 1/2" (Code 62) / M27×2 |
| HYH2FM107–125 | ∅200 mm / 4× ∅17.5 mm | W40×2 (Z) / W45×2 (A) | ∅40 mm (P) / ∅45 mm (B) | SAE 1 1/4" (Plate 01/10) / SAE 1" (02) |
| HYH2FM160–180 | ∅224 mm / 4× ∅17.5 mm | W45×2 (Z) / W50×2 (A) | ∅45 mm (P) / ∅50 mm (B) | SAE 1 1/4" (Code 62) |
| HYH2FM200 | ∅250 mm / 4× ∅22 mm | W50×2×24×9g (A) | ∅50 mm, AS14×9×80 (Shaft B) | SAE 1 1/4" (Code 62 / 450 bar) |
| HYH2FM250 | ∅280 mm / 4× ∅22 mm | W50×2×24×9g (Z) | ∅50 mm, AS14×9×80 (Shaft P) | SAE 1 1/4" (Code 62 / 400 bar) |
| HYH2FM355–500 | 8-hole heavy-duty pattern | W60×2 / W70×3 (Z) | ∅60 mm / ∅70 mm (P) | SAE 1 1/2" (Code 62 / 400 bar) |
| HYH2FM710–1000 | 8-hole heavy-duty pattern | W90×3×28×9g (Z) | ∅90 mm, AS25×14×140 (Shaft P) | SAE 2" (Code 62 / 400 bar) |
| Installation Specifications
| Mathematical Operating Characteristics
Inlet Flow Rate: qv = (Vg × n) / (1000 × ηv) [L/min]
Rotational Speed: n = (qv × 1000 × ηv) / Vg [rpm]
Output Torque: M = (Vg × Δp × ηhm) / (20 × π) [Nm]
Drive Power: P = (2π × M × n) / 60000 = (qv × Δp × ηt) / 600 [kW]
| Connection Port Identification & Standard Layout
| Port Identifier | Port Function / Description | Pressure Rating (pmax) | Applicable Metric Port Standard | Connection State |
|---|---|---|---|---|
| A, B | High-Pressure Working Lines | 350 bar to 450 bar | SAE J518 Code 62 (metric DIN 13 threads) or DIN 3852 | Must be connected |
| T1, T2 | Case Drain Fluid Ports | 2 bar continuous (10 bar peak) | DIN 3852 (M10×1 to M22×1.5) | One port connected to tank |
| U | Bearing Flushing Port | 2 bar continuous | DIN 3852 (M14×1.5 to M18×1.5) | Connected for long-life / vertical duty |
| R | Air Bleed Port | 2 bar continuous | DIN 3852 | Plugged during normal operation |
| Replacement Splined Shaft Interface Matrix (DIN 5480 Standard)
| Shaft Identifier | Standard Spline Specification | Applicable Frame Sizes | Center Bore Retention Thread | Maximum Transmissible Torque Rating |
|---|---|---|---|---|
| Z (Size 10–16) | DIN 5480 W20×1.25×14×9g | HYH2FM10, HYH2FM12 | M6 × 1.0 (16 mm deep) | 76 Nm |
| A (Size 10–16) | DIN 5480 W25×1.25×18×9g | HYH2FM10, HYH2FM12, HYH2FM16 | M10 × 1.5 (22 mm deep) | 102 Nm |
| Z (Size 23–28) | DIN 5480 W25×1.25×18×9g | HYH2FM23, HYH2FM28 | M8 × 1.25 (19 mm deep) | 179 Nm |
| A (Size 23–32) | DIN 5480 W30×2×14×9g | HYH2FM23, HYH2FM28, HYH2FM32 | M10 × 1.5 (22 mm deep) | 204 Nm |
| Z (Size 107) | DIN 5480 W40×2×18×9g | HYH2FM107 | M12 × 1.75 (28 mm deep) | 679 Nm |
| A (Size 107–125) | DIN 5480 W45×2×21×9g | HYH2FM107, HYH2FM125 | M16 × 2.0 (36 mm deep) | 796 Nm |
| Z (Size 160) | DIN 5480 W45×2×21×9g | HYH2FM160 | M16 × 2.0 (36 mm deep) | 1,021 Nm |
| A (Size 160–180) | DIN 5480 W50×2×24×9g | HYH2FM160, HYH2FM180 | M16 × 2.0 (36 mm deep) | 1,146 Nm |
| A (Size 200) | DIN 5480 W50×2×24×9g | HYH2FM200 | M16 × 2.0 (36 mm deep) | 1,273 Nm |
| Z (Size 250) | DIN 5480 W50×2×24×9g | HYH2FM250 | M16 × 2.0 (36 mm deep) | 1,393 Nm |
| Z (Size 355) | DIN 5480 W60×2×28×9g | HYH2FM355 | M20 × 2.5 (42 mm deep) | 1,978 Nm |
| Z (Size 500) | DIN 5480 W70×3×22×9g | HYH2FM500 | M20 × 2.5 (42 mm deep) | 2,785 Nm |
| Z (Size 710–1000) | DIN 5480 W90×3×28×9g | HYH2FM710, HYH2FM1000 | M24 × 3.0 (50 mm deep) | 5,570 Nm |
Technical Specifications of HENGYUHANG HYH2FM Series (Sizes 5 to 1000)
4.1 Displacement, Rotational Speed, Flow, and Torque Ratings (Sizes 5 to 32)
| Technical Parameter | Unit | HYH2FM5 | HYH2FM10 | HYH2FM12 | HYH2FM16 | HYH2FM23 | HYH2FM28 | HYH2FM32 |
|---|---|---|---|---|---|---|---|---|
| Geometric Displacement (Vg) | cm³/rev | 4.93 | 10.3 | 12.0 | 16.0 | 22.9 | 28.1 | 32.0 |
| Nominal Working Pressure (pₙₒₘ) | bar | 315 | 400 | 400 | 400 | 400 | 400 | 400 |
| Maximum Peak Pressure (pₘₐₓ) | bar | 350 | 450 | 450 | 450 | 450 | 450 | 450 |
| Nominal Rotational Speed (nₙₒₘ) | rpm | 10,000 | 8,000 | 8,000 | 8,000 | 6,300 | 6,300 | 6,300 |
| Maximum Intermittent Speed (nₘₐₓ) | rpm | 11,000 | 8,800 | 8,800 | 8,800 | 6,900 | 6,900 | 6,900 |
| Maximum Inlet Flow (qv max at nₙₒₘ) | L/min | 49 | 82 | 96 | 128 | 144 | 177 | 202 |
| Output Torque at pₙₒₘ (M) | Nm | 24.7 | 66.0 | 76.0 | 102.0 | 146.0 | 179.0 | 204.0 |
| Rotary Stiffness (c) | kNm/rad | 0.63 | 0.92 | 1.25 | 1.59 | 2.56 | 2.93 | 3.12 |
| Mass Moment of Inertia (J_TW) | kg·m² | 0.00006 | 0.0004 | 0.0004 | 0.0004 | 0.0012 | 0.0012 | 0.0012 |
| Case Oil Volume (V) | L | 0.17 | 0.17 | 0.17 | 0.20 | 0.20 | 0.20 | 0.20 |
| Dry Weight (approx.) | kg | 2.5 | 5.4 | 5.4 | 5.4 | 9.5 | 9.5 | 9.5 |
4.2 Displacement, Rotational Speed, Flow, and Torque Ratings (Sizes 107 to 1000)
| Technical Parameter | Unit | HYH2FM107 | HYH2FM125 | HYH2FM160 | HYH2FM180 | HYH2FM200 | HYH2FM250 | HYH2FM355 | HYH2FM500 | HYH2FM710 | HYH2FM1000 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Geometric Displacement (Vg) | cm³/rev | 106.7 | 125.0 | 160.4 | 180.0 | 200.0 | 250.0 | 355.0 | 500.0 | 710.0 | 1000.0 |
| Nominal Pressure (pₙₒₘ) | bar | 400 | 400 | 400 | 400 | 400 | 350 | 350 | 350 | 350 | 350 |
| Maximum Peak Pressure (pₘₐₓ) | bar | 450 | 450 | 450 | 450 | 450 | 400 | 400 | 400 | 400 | 400 |
| Nominal Speed (nₙₒₘ) | rpm | 4,000 | 4,000 | 3,600 | 3,600 | 2,750 | 2,700 | 2,240 | 2,000 | 1,600 | 1,800 |
| Max Intermittent Speed (nₘₐₓ) | rpm | 4,400 | 4,400 | 4,000 | 4,000 | 3,000 | — | — | — | — | — |
| Max Inflow (qv max at nₙₒₘ) | L/min | 427 | 500 | 577 | 648 | 550 | 675 | 795 | 1000 | 1136 | 1600 |
| Output Torque at pₙₒₘ (M) | Nm | 679 | 796 | 1,021 | 1,146 | 1,273 | 1,393 | 1,978 | 2,785 | 3,955 | 5,570 |
| Rotary Stiffness (c) | kNm/rad | 11.2 | 11.9 | 17.4 | 18.2 | 57.3 | 73.1 | 96.1 | 144.0 | 270.0 | 324.0 |
| Moment of Inertia (J_TW) | kg·m² | 0.0116 | 0.0116 | 0.0220 | 0.0220 | 0.0353 | 0.0610 | 0.1020 | 0.1780 | 0.5500 | 0.5500 |
| Case Oil Volume (V) | L | 0.80 | 0.80 | 1.10 | 1.10 | 2.70 | 2.50 | 3.50 | 4.20 | 8.00 | 8.00 |
| Dry Weight (approx.) | kg | 32.0 | 32.0 | 45.0 | 45.0 | 66.0 | 73.0 | 110.0 | 155.0 | 325.0 | 336.0 |
4.3 Operating Pressure Boundaries
| Pressure Parameter | Rated Value | Operating Condition / Allowable Limits |
|---|---|---|
| Nominal Pressure (pₙₒₘ) | 315 bar (Size 5) / 400 bar (Sizes 10–200) / 350 bar (Sizes 250–1000) | Continuous design pressure at work port A or B |
| Maximum Pressure (pₘₐₓ) | 350 bar (Size 5) / 450 bar (Sizes 10–200) / 400 bar (Sizes 250–1000) | Single cycle duration ≤10 s; total accumulation ≤300 hours |
| Summation Pressure (p_Su) | 700 bar (10,150 psi) | Sum of simultaneous working pressures at Port A and Port B (p_A + p_B) |
| Minimum High-Pressure Inflow (p_HP min) | 25 bar (360 psi) | Required minimum pressure on loaded port to prevent piston shoe liftoff |
| Continuous Housing Drain Pressure | 2.0 bar (29 psi) | Maximum average differential pressure at shaft seal (case to ambient) |
| Transient Housing Pressure Peak | 10.0 bar (145 psi) | Permissible instantaneous surge duration t<0.1 s |
4.4 Hydraulic Fluid Cleanliness & Viscosity Requirements
| Fluid Property | Specified Operational Range | Criteria & System Guidelines |
|---|---|---|
| Recommended Hydraulic Fluid | Mineral oil HLP per DIN 51524 | Suitable for environmentally acceptable (HEES/HEPR) fluids upon seal review |
| Optimum Viscosity Range (νₒₚₜ) | 16 to 36 mm²/s | Yields optimal volumetric efficiency and thermodynamic fluid life |
| Permissible Continuous Range | 10 to 400 mm²/s | Minimum short-term viscosity: νₘᵢₙ =7 mm²/s (t≤3 min at p≤0.3×pₙₒₘ) |
| Cold Start Viscosity Limit | ≤1,600 mm²/s | t≤3 min at unloaded crawl speed (p≤50 bar, n≤1,000 rpm, ϑ≥−25 ∘C) |
| Fluid Temperature Range | −25 ∘C to +103 ∘C (FKM Seals) | Maximum continuous circuit temperature: +115 ∘C measured at work ports |
| Required ISO Cleanliness Class | ISO 4406 Class 20/18/15 | At fluid viscosity <10 mm²/s, minimum cleanliness must reach ISO 19/17/14 |
Advantages
High-Efficiency Bent-Axis Architecture
40° bent-axis rotary group with precision spherical valve plate delivers total operating efficiencies exceeding 93%, with exceptionally low friction losses and high starting torque.
Extreme Speed & Pressure Capabilities
Approved for continuous operating speeds up to 10,000 rpm and peak working pressures up to 450 bar, outperforming conventional swashplate fixed motors in high-speed auxiliary and winch applications.
Outstanding Starting Torque & Creep Smoothness
High mechanical-hydraulic starting efficiency (>90%) eliminates startup hesitation, stick-slip vibration, and shudder under high initial hoist and swing loads.
Robust Tapered Roller Bearing System
Heavy-duty bearing geometry absorbs intense external radial forces and high dynamic cyclic loads, ensuring extended service life in direct gear and pinion drives.
Comprehensive Modular Porting & Integrated Valve Options
Available with rear (Plate 01), side opposite (Plate 02), and bottom (Plate 10) SAE ports, threaded ports (03/04), integrated secondary pressure relief valves (Plate 19), and bolt-on counterbalance valves (BVD/BVE).
Direct 1:1 OEM Bolt-In Interchangeability
Identical ISO 3019-2 4-bolt/8-bolt flange pilot dimensions, DIN 5480 splined shafts, and SAE J518 Code 62 port patterns allow direct drop-in replacement of Bosch Rexroth A2FM Series 6x units with zero mechanical rework.
| 6. Cross Reference
6.1 Dimensional & Hydraulic Frame Mapping
| Rexroth Original Model | Nominal Pressure | Max Displacement | Mounting Flange (ISO) | Standard Splined Shaft | HENGYUHANG Replacement Model |
|---|---|---|---|---|---|
| A2FM5.../60 | 315 bar | 4.93 cm³/rev | ISO 60-4 | Conical Shaft C / Keyed B (Ø12) | HYH2FM5 |
| A2FM10.../61 | 400 bar | 10.3 cm³/rev | ISO 80-4 | W20×1.25 (Z) W25×1.25 (A) | HYH2FM10 |
| A2FM12.../61 | 400 bar | 12.0 cm³/rev | ISO 80-4 | W20×1.25 (Z) W25×1.25 (A) | HYH2FM12 |
| A2FM16.../61 | 400 bar | 16.0 cm³/rev | ISO 80-4 | W25×1.25×18×9g (A) | HYH2FM16 |
| A2FM23.../61 | 400 bar | 22.9 cm³/rev | ISO 100-4 | W25×1.25 (Z) W30×2 (A) | HYH2FM23 |
| A2FM28.../61 | 400 bar | 28.1 cm³/rev | ISO 100-4 | W25×1.25 (Z) W30×2 (A) | HYH2FM28 |
| A2FM32.../61 | 400 bar | 32.0 cm³/rev | ISO 100-4 | W30×2×14×9g (A) | HYH2FM32 |
| A2FM107.../61 | 400 bar | 106.7 cm³/rev | ISO 160-4 | W40×2 (Z) W45×2 (A) | HYH2FM107 |
| A2FM125.../61 | 400 bar | 125.0 cm³/rev | ISO 160-4 | W45×2×21×9g (A) | HYH2FM125 |
| A2FM160.../61 | 400 bar | 160.4 cm³/rev | ISO 180-4 | W45×2 (Z) W50×2 (A) | HYH2FM160 |
| A2FM180.../61 | 400 bar | 180.0 cm³/rev | ISO 180-4 | W50×2×24×9g (A) | HYH2FM180 |
| A2FM200.../63 | 400 bar | 200.0 cm³/rev | ISO 200-4 | W50×2×24×9g (A) | HYH2FM200 |
| A2FM250.../60 | 350 bar | 250.0 cm³/rev | ISO 224-4 | W50×2×24×9g (Z) | HYH2FM250 |
| A2FM355.../60 | 350 bar | 355.0 cm³/rev | ISO 280 (8-bolt) | W60×2×28×9g (Z) | HYH2FM355 |
| A2FM500.../60 | 350 bar | 500.0 cm³/rev | ISO 315 (8-bolt) | W70×3×22×9g (Z) | HYH2FM500 |
| A2FM710.../60 | 350 bar | 710.0 cm³/rev | ISO 8-bolt | W90×3×28×9g (Z) | HYH2FM710 |
| A2FM1000.../60 | 350 bar | 1000.0 cm³/rev | ISO 8-bolt | W90×3×28×9g (Z) | HYH2FM1000 |
6.2 Port Plate & Valve Configuration Mapping
| Port Plate Code | Port Orientation & Flange Type | Valve Integration | Primary Operational Application |
|---|---|---|---|
| 01 | SAE Working Ports A and B at Rear | None (0) or Flushing Valve (7) | Axial in-line hose routing for winch and drill drives |
| 02 | SAE Working Ports A and B at Side, Opposite | None (0) or Flushing Valve (7) | Lateral piping connection for machinery frames |
| 03 | Metric Threaded Ports A and B at Side, Opposite | Standard threaded ports | Compact mobile machinery with metric fittings |
| 04 | Metric Threaded Ports at Side and Rear | Plugs provided for flexible routing | High-versatility piping layouts |
| 10 | SAE Working Ports A and B at Bottom | Standard bottom flange ports | Compact vertical gearbox mounting |
| 17 / 18 | Port Plate for Counterbalance Valve Mounting | Fitted for BVD / BVE valves | Winch hoisting drives and travel brake circuits |
| 19 | Port Plate with Integrated Pressure Relief Valves | Direct relief valves (1) / boost (2) | Swing and slew drives requiring anti-cavitation relief |
| 7. Brand Replacement
Bosch Rexroth (Primary 1:1 direct drop-in replacement for A2FM Series 6x bent-axis fixed displacement motors)
Linde Hydraulics (BMF Series fixed displacement bent-axis motors)
Parker Hannifin / Voac (F11 and F12 Series heavy-duty bent-axis fixed motors)
Danfoss (Series 51 and OMT/OMV orbital/piston motor conversions upon engineering review)
Eaton / Vickers fixed displacement piston motors retrofitted upon request
| 8. Applications
Excavator & Crane Slew / Swing Drives: Port Plate 19 configuration delivers integrated pressure relief and anti-cavitation cushioning during rapid superstructure acceleration and deceleration.
Mobile & Marine Crane Winch Drives: High starting efficiency (>90%) ensures smooth, jerk-free lifting of suspended loads without slippage or rope shock.
Rotary Drilling Rigs & Foundation Equipment: Continuous 400 bar pressure capability and high permissible speeds provide immense rotary torque on drill heads.
Forestry Processing Heads & Saws: Ultra-high rotational speed capability up to 8,000–10,000 rpm drives high-speed harvester saw chains and feed rollers.
Municipal Road Sweepers & Snow Blowers: High-power-density hydraulic drive for rotating brooms and snow throwing impellers.
Heavy Mining & Tunneling Machinery: Rugged cast ductile iron casing and heavy-duty tapered roller bearings withstand severe shock loads and stone impacts.
| 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 400 bar rated duty and 450 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 HYH2FM 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% under full working pressure, eliminating sluggish machine drive response.
Pressure Endurance Verification: 100% sustained high-pressure hold at 400 bar nominal and 450 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.
Starting Torque & Creep Verification: Strict verification of breakaway friction and low-speed torque stability down to 50 rpm, guaranteeing smooth, pulsation-free crane hoisting and swing control.
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 ISO 3019-2 4-bolt and 8-bolt mounting flange pilot diameters (ISO 60, 80, 100, 160, 180, 200, 224, 280), bolt circle PCDs, and pilot depths correspond 1:1 to original Bosch Rexroth A2FM Series 6x specifications down to the millimeter.
Zero Piping or Chassis Rework: Standard rear SAE ports (Port Plate 01), side opposite SAE ports (Port Plate 02), bottom SAE ports (Port Plate 10), and threaded metric ports (Port Plate 03/04) connect directly to existing high-pressure hose assemblies with zero pipe bending or adaptor refitting.
Drive Spline Conformity: Precision DIN 5480 involute splines (Shaft Codes Z and A) and parallel keyed shafts (Codes P and B) mesh seamlessly with OEM gearboxes, winches, and reduction hubs without spline binding, backlash vibration, or premature drive hub wear.
Flexible Engineering Customization & Rapid Prototyping:
Special Slew Drive Tuning: Factory-configured Port Plate 19 with integrated secondary pressure relief and anti-cavitation check valves specifically tuned for machine swing drives.
Flushing & High-Temperature Options: Integrated low-pressure flushing and boost valves for continuous closed-loop operations in high-ambient tropical environments.
Agile OEM/ODM Solutions: Experienced fluid power engineers provide rapid turnaround for customized port thread standards, specialized shaft extensions, and integrated dual counterbalance 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 valve port plates 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 Fixed Motor HYH2FM Series 6x
HENGYUHANG Axial Piston Fixed Motor HYH2FM Series 6x is an all-purpose, heavy-duty fixed displacement hydraulic motor designed with spherical tapered piston rotary groups in a bent-axis architecture. Engineered for hydrostatic transmissions in both open and closed circuits, the HYH2FM Series 6x offers an extensive displacement range from 5 cm³/rev up to 1000 cm³/rev, delivering exceptional starting efficiency, superior total mechanical-volumetric efficiency, high power density, and continuous high-pressure capability up to 400 bar (peak pressures up to 450 bar). Available with standard ISO 3019-2 4-bolt and 8-bolt mounting flanges, DIN 5480 splined or DIN 6885 keyed drive shafts, and versatile SAE flange or metric threaded fluid ports, the HYH2FM Series 6x is a direct physical, dimensional, and operational drop-in replacement for original Bosch Rexroth A2FM Series 6x (Series 61, 63, 60) motors used in mobile construction machines, crane winches, drill rig rotary heads, and industrial drives.
Key Technical & Operational Features
Robust Bent-Axis Architecture: Spherical tapered piston heads operating in a rigid cylinder block deliver unmatched mechanical starting efficiency, minimal boundary friction, and extended service life under continuous cyclic loading.
Extensive Frame Size Variety: Complete displacement coverage across 16 nominal sizes (5, 10, 12, 16, 23, 28, 32, 107, 125, 160, 180, 200, 250, 355, 500, 710, and 1000 cm³/rev), enabling exact hydraulic motor sizing for any application.
Continuous High-Pressure Rating: Rated for 400 bar (5800 psi) nominal continuous pressure and 450 bar (6500 psi) peak maximum operating pressure across mainstream sizes 10 to 200 cm³/rev (350 bar continuous / 400 bar peak on sizes 250 to 1000; 315 bar on size 5).
High Rotational Speed Capability: Approved for high continuous operating speeds up to 10,000 rpm (size 5), 8,000 rpm (sizes 10–16), and 6,300 rpm (sizes 23–32), with overspeed capabilities during machine coasting and load lowering.
Superior Overall Efficiency: High starting torque efficiency (>90%) combined with high volumetric and total mechanical efficiency across the entire speed and pressure envelope.
Flexible Working Port Orientations: High-pressure SAE Code 62 flange ports (ISO 6162-2) or DIN 3852 metric threaded ports available in rear (Port plate 01), lateral opposite (Port plate 02/03), lateral + rear (Port plate 04), or bottom (Port plate 10) configurations.
Optional Integrated Pressure Relief Valves (MHDB): Port plates 191 and 192 feature built-in dual cross-over pressure relief valves (with or without boost facility) protecting the motor from system pressure spikes.
Mounted Counterbalance & Flushing Valves: Port plates 17 and 18 are factory-configured for direct bolt-on mounting of BVD travel counterbalance valves, BVE winch counterbalance valves, or mounted closed-circuit flushing valves (Code 7).
Special Slewing Drive Configuration (Code J): Optimized internal damping valve block tailored for crane and excavator swing drives, preventing cavitation, driveline jerking, and swing rebound during braking.
Heavy-Duty Industrial & Mobile Applications
The HENGYUHANG HYH2FM Series 6x fixed displacement motor is widely applied across heavy-duty mobile machinery and industrial hydraulic power units where high torque, high speed, and continuous durability are essential:
Lifting & Winch Systems: Mobile crane hoisting winches, tower crane main trolley drives, shipboard mooring capstans, offshore anchor winches, and drill pipe handling winches.
Excavator & Crane Slewing Drives: Hydraulic excavator upper structure swing gearboxes, mobile crane slewing rings, and forestry loader rotary grapples (with Code J anti-cavitation cushion valves).
Drilling & Underground Mining: Rotary drilling rig auger drives, horizontal directional drilling (HDD) spindle drives, tunnel blast hole drills, continuous miner cutter drums, and coal shearers.
Forestry, Agriculture & Municipal: Tree harvester saw disc drives, forestry mulcher cutting heads, combine harvester feeder drives, snow blowers, and road sweeper broom rotators.
Technical Performance Matrix (OEM Benchmark Standard)
| Technical Parameter / Frame Size | Size 10 | Size 16 | Size 28 | Size 32 | Size 107 | Size 125 | Size 160 | Size 180 | Size 200 | Size 250 |
|---|---|---|---|---|---|---|---|---|---|---|
| Geometric Displacement Vg [cm³/rev] | 10.3 | 16.0 | 28.1 | 32.0 | 106.7 | 125.0 | 160.4 | 180.0 | 200.0 | 250.0 |
| Nominal Operating Pressure pnom [bar] | 400 | 400 | 400 | 400 | 400 | 400 | 400 | 400 | 400 | 350 |
| Maximum Peak Pressure pmax [bar] | 450 | 450 | 450 | 450 | 450 | 450 | 450 | 450 | 450 | 400 |
| Nominal Continuous Speed nnom [rpm] | 8000 | 8000 | 6300 | 6300 | 4000 | 4000 | 3600 | 3600 | 2750 | 2700 |
| Maximum Intermittent Speed nmax [rpm] | 8800 | 8800 | 6900 | 6900 | 4400 | 4400 | 4000 | 4000 | 3000 | 3000 |
| Maximum Inlet Flow qV max (at nnom) [L/min] | 82 | 128 | 177 | 202 | 427 | 500 | 577 | 648 | 550 | 675 |
| Output Torque M (at pnom = 400 bar) [Nm] | 66 | 102 | 179 | 204 | 679 | 796 | 1021 | 1146 | 1273 | 1393 |
| Rotary Stiffness c [kNm/rad] | 0.92 | 1.59 | 2.93 | 3.12 | 11.2 | 11.9 | 17.4 | 18.2 | 57.3 | 73.1 |
| Rotary Group Moment of Inertia JTW [kg·m²] | 0.0004 | 0.0004 | 0.0012 | 0.0012 | 0.0116 | 0.0116 | 0.0220 | 0.0220 | 0.0353 | 0.0610 |
| Maximum Angular Acceleration α [rad/s²] | 5000 | 5000 | 6500 | 6500 | 4500 | 4500 | 3500 | 3500 | 11000 | 10000 |
| Case Fluid Volume V [L] | 0.17 | 0.17 | 0.20 | 0.20 | 0.80 | 0.80 | 1.10 | 1.10 | 2.70 | 2.50 |
| Dry Weight (Approximate) [kg] | 5.4 | 5.4 | 9.5 | 9.5 | 32.0 | 32.0 | 45.0 | 45.0 | 66.0 | 73.0 |
* Values apply within optimum operating viscosity range νopt = 16 to 36 mm²/s using standard mineral oil fluids. Maximum peak pressure of 450 bar is valid for short-term dynamic pressure peaks (t < 5 s). Micro sizes 5, 12, 23 cm³/rev and heavy-duty industrial sizes 355, 500, 710, 1000 cm³/rev are fully available on request.
Mechanical Installation Interface Specifications
Part 1: Standard ISO 3019-2 4-bolt and 8-bolt mounting flange dimensions, centering pilot diameter, bolt hole pitch circle, and DIN 5480 splined / DIN 6885 keyed drive shafts.
| Frame Size (NG) | Flange Standard & Code | Centering Pilot Ø (ISO 3019-2) | Bolt Hole Pitch & Pattern | Primary Drive Shaft (DIN 5480 Splined) | Keyed Shaft (DIN 6885 Parallel) |
|---|---|---|---|---|---|
| HYH2FM005 | Code B (4-bolt) | Ø50 mm (0 / -0.025 mm) | Pitch Ø63 mm / 4x Ø6.6 mm | Code C: Conical shaft with woodruff key | Code B: Keyed parallel shaft Ø14 mm |
| HYH2FM010 / 012 / 016 | Code B (4-bolt) | Ø80 mm (0 / -0.019 mm) | Pitch Ø100 mm / 4x Ø9.0 mm | Code A: W25×1.25×18×9g / Code Z: W20×1.25 | Code B: AS8×7×32 / Code P: AS6×6×32 |
| HYH2FM023 / 028 / 032 | Code B (4-bolt) | Ø100 mm (0 / -0.022 mm) | Pitch Ø125 mm / 4x Ø11.0 mm | Code A: W30×2×14×9g / Code Z: W25×1.25 | Code B: AS8×7×40 / Code P: AS8×7×40 |
| HYH2FM107 / 125 | Code B (4-bolt) | Ø160 mm (0 / -0.025 mm) | Pitch Ø200 mm / 4x Ø17.5 mm | Code A: W45×2×21×9g / Code Z: W40×2 | Code B: AS14×9×70 / Code P: AS12×8×65 |
| HYH2FM160 / 180 | Code B (4-bolt) | Ø180 mm (0 / -0.025 mm) | Pitch Ø224 mm / 4x Ø17.5 mm | Code A: W50×2×24×9g / Code Z: W45×2 | Code B: AS14×9×80 / Code P: AS14×9×70 |
| HYH2FM200 | Code B (4-bolt) | Ø200 mm (0 / -0.029 mm) | Pitch Ø250 mm / 4x Ø22.0 mm | Code A: W50×2×24×9g (L=55 mm) | Code B: Keyed parallel shaft AS16×10×80 |
| HYH2FM250 | Code B (4-bolt) | Ø224 mm (0 / -0.072 mm) | Pitch Ø280 mm / 4x Ø22.0 mm | Code Z: W50×2×24×9g (L=55 mm) | Code P: Keyed parallel shaft AS16×10×90 |
| HYH2FM355 / 500 | Code H (8-bolt) | Ø280 mm (0 / -0.032 mm) | Pitch Ø320 mm / 8x Ø22.0 mm | Code Z: W60×2 (355) / W70×3 (500) | Code P: Parallel shaft Ø60 / Ø70 mm |
Fluid Connection & Port Configuration Specifications
Part 2: Hydraulic fluid connections across working lines A/B (SAE J518 Code 62 or DIN 3852 threaded), case drain ports T1/T2, bearing flushing U, and pressure gauge ports.
| Frame Size (NG) | Working Ports A & B (SAE Code 62) | Working Ports A & B (Threaded DIN 3852) | Drain Port T1 (DIN 3852) | Drain Port T2 (DIN 3852) | Flushing Port U / Gauge MA, MB |
|---|---|---|---|---|---|
| HYH2FM005 | – (Threaded Ports Only) | M18×1.5 (12 mm deep, pmax 350 bar) | M10×1 (8 mm deep, plugged) | M10×1 (8 mm deep, plugged) | – |
| HYH2FM010 / 012 / 016 | – (Threaded Ports Only) | M22×1.5 (14 mm deep, pmax 450 bar) | M12×1.5 (12 mm deep, plugged) | M12×1.5 (12 mm deep, plugged) | – |
| HYH2FM023 / 028 / 032 | SAE 1/2 in (M8×1.25, 15 deep, Port 01/02) | M27×2 (16 mm deep, Port 03/04) | M16×1.5 (12 mm deep, plugged) | M16×1.5 (12 mm deep, plugged) | U: M14×1.5 (with valve) |
| HYH2FM107 / 125 | SAE 1 1/4 in (M14×2, 19 deep, Port 01/02) | – (Flange Ports Standard) | M18×1.5 (12 mm deep, plugged) | M18×1.5 (12 mm deep, plugged) | U: M14×1.5 / MA,MB: M14×1.5 |
| HYH2FM160 / 180 | SAE 1 1/4 in (M14×2, 19 deep, Port 01/02) | – (Flange Ports Standard) | M22×1.5 (14 mm deep, plugged) | M22×1.5 (14 mm deep, plugged) | U: M14×1.5 / MA,MB: M14×1.5 |
| HYH2FM200 | SAE 1 1/4 in (M14×2, 19 deep, Port 01) | – (Flange Ports Standard) | M22×1.5 (14 mm deep, plugged) | M22×1.5 (14 mm deep, plugged) | U: M14×1.5 / MA,MB: M14×1.5 |
| HYH2FM250 | SAE 1 1/4 in (M14×2, 19 deep, Port 01/02) | – (Flange Ports Standard) | M22×1.5 (14 mm deep, plugged) | M22×1.5 (14 mm deep, plugged) | U: M18×1.5 (flushing port) |
| HYH2FM355 / 500 | SAE 1 1/2 in (M16×2, 21 deep, Port 01/02) | – (Flange Ports Standard) | M33×2 (19 mm deep, plugged) | M33×2 (19 mm deep, plugged) | U: M18×1.5 / MA,MB: M18×1.5 |
Integrated & Bolt-On Valve Modules
| Valve Module Code | Valve Type & Mounting | Functional Characteristics & Circuit Protection |
|---|---|---|
| MHDB 191 / 192 | Integrated Pressure Relief Valves (Port Plate 19) | Integrated dual cross-over high-pressure relief valves directly built into the motor rear port plate. Protects motor rotary group and load from pressure spikes during rapid stops. Code 191 is standard relief without boost; Code 192 includes pressure boost facility for closed circuits. Adjustable pressure settings: 250, 280, 300, 350, 400, 420 bar. |
| BVD / BVE 178 / 188 | Mounted Counterbalance Valves (Port Plates 17 & 18) | Bolt-on motion control counterbalance valves. BVD is engineered for hydrostatic travel drives to prevent motor runaway on steep grades; BVE is engineered for crane hoisting and winch drives to guarantee safe, controlled load lowering and prevent cavitative overrun. Available with internal or external brake release line piping. |
| Flushing Valve 017 / 027 | Mounted Flushing & Boost Valve (Fixed Cracking 16 bar) | Used in closed hydrostatic transmission loops to continuously discharge heated oil from the low-pressure circuit line into the motor casing, where it returns to reservoir via the case drain for filtration and cooling. Standard calibrated flushing orifices supply 3.5 L/min (sizes 23–32), 5 L/min (size 80), 8 L/min (size 107), and 10 L/min (sizes 160–250). |
| Slew Drive Version (Code J) | Anti-Cavitation Slew Cushioning (Standard with Port Plate 19) | Special rotary unit and porting execution optimized for excavator and crane superstructure swing gearboxes. Eliminates hydraulic cavitation during rapid swinging deceleration, cushions swing reversals, and prevents backlash shudder when slewing stops. |
HENGYUHANG HYH2FM Series 6x Ordering Code Structure
| Pos. | Code Segment | Available Options | Description & Engineering Specifications |
|---|---|---|---|
| 01 | Hydraulic Fluid | Omitted E- | Mineral oil and HFD fluids (standard) HFB and HFC water-based fire-resistant hydraulic fluids (requires Long-life bearing L) |
| 02 | Axial Piston Unit | HYH2F | Bent-axis fixed displacement axial piston motor, high-pressure design |
| 03 | Drive Shaft Bearings | Omitted L | Standard heavy-duty mechanical tapered roller bearings (sizes 5–200) Long-life bearing assembly for extended duty cycle and HF fluids (sizes 250–1000) |
| 04 | Operating Mode | M | Motor, open and closed hydrostatic circuits |
| 05 | Nominal Size (NG) | 005 to 1000 | Available displacements: 5, 10, 12, 16, 23, 28, 32, 107, 125, 160, 180, 200, 250, 355, 500, 710, 1000 cm³/rev |
| 06 | Series Index | 6 | Series 6 |
| 07 | Index Version | 1 3 0 | Index 1: Sizes 10 to 180 cm³/rev Index 3: Size 200 cm³/rev Index 0: Size 5 and sizes 250 to 1000 cm³/rev |
| 08 | Direction of Rotation | W | Bi-directional (reversible, viewed on drive shaft) |
| 09 | Sealing Material | V | FKM (Fluorocarbon rubber / Viton seals, high-temperature rating) |
| 10 | Drive Shaft Code | A Z B P C | Splined shaft DIN 5480 (standard high-torque execution) Splined shaft DIN 5480 (alternative diameter/spline tooth count) Parallel keyed shaft DIN 6885 (with key) Parallel keyed shaft DIN 6885 (alternative diameter) Conical shaft with woodruff key (size 5 only) |
| 11 | Mounting Flange | B H | ISO 3019-2 4-hole mounting flange (sizes 5 to 250) ISO 3019-2 8-hole mounting flange (sizes 355 to 1000) |
| 12 | Working Ports A & B | 010 / 017 020 / 027 030 040 100 171 / 181 178 / 188 191 / 192 | SAE working ports at rear (without / with flushing valve 7) SAE working ports lateral opposite (without / with flushing valve 7) Threaded metric ports DIN 3852 lateral opposite (sizes 5–32) Threaded metric ports DIN 3852 lateral and rear (sizes 10–32) SAE working ports at bottom (sizes 28, 32, 107–180) Port plate configured for mounting counterbalance valve BVD / BVE Port plate with mounted counterbalance valve BVD (178) / BVE (188) Port plate with integrated MHDB pressure relief valves (without / with boost) |
| 13 | Speed Sensors | Omitted U / V F / H | Without speed sensor Prepared for DSA speed sensor (U) / DSA speed sensor mounted (V) Prepared for HDD speed sensor (F) / HDD speed sensor mounted (H, size 200) |
| 14 | Special Execution | Omitted J | Standard execution Special slewing drive execution (standard with port plate 19) |
| 15 | Version Suffix | Omitted -Y -S | Standard factory version Installation variant (e.g. customized drain plug configuration) Customer-specific special build |
Example Standard Order Codes: HYH2FM107/61W-VAB010 (Size 107 cm³, Series 61, Bi-directional, Viton Seals, Splined Shaft W45×2, ISO 4-Bolt Flange, Rear SAE 1 1/4" Ports) or HYH2FM160/61W-VAB191 (Size 160 cm³, Port Plate 19 with Integrated MHDB Pressure Relief Valves).
Direct Interchangeability & OEM Cross-Reference Matrix
HENGYUHANG HYH2FM Series 6x fixed displacement hydraulic motors are 100% physically, dimensionally, and hydraulically interchangeable with OEM Bosch Rexroth A2FM Series 6x units, fitting existing machine chassis, gearbox pilots, DIN 5480 splines, and hydraulic piping:
| OEM Rexroth Model Code | HENGYUHANG Replacement Code | Displacement & Flange | Shaft & Ports | Integrated Valve | Interchangeability |
|---|---|---|---|---|---|
| A2FM10/61W-VAB030 | HYH2FM10/61W-VAB030 | 10.3 cm³, ISO Ø80 4-bolt | DIN W25×1.25, Threaded M22 | Without Valve | 100% Drop-In |
| A2FM16/61W-VAB030 | HYH2FM16/61W-VAB030 | 16.0 cm³, ISO Ø80 4-bolt | DIN W25×1.25, Threaded M22 | Without Valve | 100% Drop-In |
| A2FM28/61W-VAB010 | HYH2FM28/61W-VAB010 | 28.1 cm³, ISO Ø100 4-bolt | DIN W30×2, Rear SAE 1/2" | Without Valve | 100% Drop-In |
| A2FM32/61W-VAB020 | HYH2FM32/61W-VAB020 | 32.0 cm³, ISO Ø100 4-bolt | DIN W30×2, Side SAE 1/2" | Without Valve | 100% Drop-In |
| A2FM107/61W-VAB010 | HYH2FM107/61W-VAB010 | 106.7 cm³, ISO Ø160 4-bolt | DIN W45×2, Rear SAE 1 1/4" | Without Valve | 100% Drop-In |
| A2FM107/61W-VAB191J | HYH2FM107/61W-VAB191J | 106.7 cm³, ISO Ø160 4-bolt | DIN W45×2, Rear SAE 1 1/4" | MHDB Relief + Slew Code J | 100% Drop-In |
| A2FM125/61W-VAB020 | HYH2FM125/61W-VAB020 | 125.0 cm³, ISO Ø160 4-bolt | DIN W45×2, Side SAE 1 1/4" | Without Valve | 100% Drop-In |
| A2FM160/61W-VAB010 | HYH2FM160/61W-VAB010 | 160.4 cm³, ISO Ø180 4-bolt | DIN W50×2, Rear SAE 1 1/4" | Without Valve | 100% Drop-In |
| A2FM160/61W-VAB188 | HYH2FM160/61W-VAB188 | 160.4 cm³, ISO Ø180 4-bolt | DIN W50×2, Mounted BVE | BVE Winch Valve | 100% Drop-In |
| A2FM180/61W-VAB010 | HYH2FM180/61W-VAB010 | 180.0 cm³, ISO Ø180 4-bolt | DIN W50×2, Rear SAE 1 1/4" | Without Valve | 100% Drop-In |
| A2FM200/63W-VAB010 | HYH2FM200/63W-VAB010 | 200.0 cm³, ISO Ø200 4-bolt | DIN W50×2, Rear SAE 1 1/4" | Without Valve | 100% Drop-In |
| A2FM250/60W-VZB010 | HYH2FM250/60W-VZB010 | 250.0 cm³, ISO Ø224 4-bolt | DIN W50×2, Rear SAE 1 1/4" | Without Valve | 100% Drop-In |
Hydraulic Commissioning & Installation Guidelines
1. Initial Priming & Complete Air Bleeding: Before initial commissioning, the motor casing must be completely pre-filled with filtered hydraulic fluid via the highest positioned drain port (T1 or T2) and thoroughly deaerated. Operating with an empty or partially dry casing will cause instantaneous boundary lubrication failure, scoring of the spherical cylinder face, and destruction of drive shaft bearings.
2. Housing Drain Line Routing: Always pipe the case drain line from the uppermost drain port directly to the reservoir without check valves, shut-off devices, or restrictive fittings. Housing continuous pressure must not exceed 2.0 bar abs (maximum dynamic pressure peak ≤ 3.0 bar abs). Excessive casing pressure damages the FKM radial shaft seal and increases internal mechanical drag.
3. Low-Pressure Cavitation Prevention: During rapid motor braking, overrunning loads, or high-speed winch lowering, a minimum boost pressure of pabs ≥ 10–14 bar must be maintained at the inlet working port to prevent cavitation, piston slipper lift-off, and mechanical separation of the cylinder block.
4. Fluid Cleanliness Rating: Maintain fluid cleanliness class according to ISO 4406 at 20/18/15 or cleaner (at temperatures above 80 °C or low viscosity < 10 mm²/s, maintain 19/17/14). Utilize return-line or pressure-line filtration with a filtration ratio of β10 ≥ 100.
5. Radial Shaft Loading Precautions: If the motor drive shaft is subjected to external radial loads (belt pulleys, chain sprockets, or spur gears), verify that the radial load magnitude and direction conform to the permissible load envelope in the technical documentation.
Data Verification & Technical Notes
Reference Benchmark Datasheet: Bosch Rexroth AG Technical Datasheet RE 91001 (Edition: 2019-09-17), Pages 1–34 (Axial Piston Fixed Motor A2FM Series 6x).
Quality Guarantee & Dynamic Testing: Every HENGYUHANG HYH2FM Series 6x motor is 100% dynamically load-tested on computerized test stands for full volumetric efficiency, starting torque, high-speed stability up to 8000+ rpm, and case leakage under 400 bar continuous and 450 bar peak pressure before dispatch.
Custom Engineering & Modifications: HENGYUHANG provides custom shaft splines, special port threads, integrated speed sensors (DSA/HDD), slew drive cushion valves (Code J), and mounted counterbalance valves tailored to specific machine serial numbers.
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Technical Performance Matrix (OEM Benchmark Standard)
| Technical Parameter / Frame Size | Size 10 | Size 16 | Size 28 | Size 32 | Size 107 | Size 125 | Size 160 | Size 180 | Size 200 | Size 250 |
|---|---|---|---|---|---|---|---|---|---|---|
| Geometric Displacement Vg [cm³/rev] | 10.3 | 16.0 | 28.1 | 32.0 | 106.7 | 125.0 | 160.4 | 180.0 | 200.0 | 250.0 |
| Nominal Operating Pressure pnom [bar] | 400 | 400 | 400 | 400 | 400 | 400 | 400 | 400 | 400 | 350 |
| Maximum Peak Pressure pmax [bar] | 450 | 450 | 450 | 450 | 450 | 450 | 450 | 450 | 450 | 400 |
| Nominal Continuous Speed nnom [rpm] | 8000 | 8000 | 6300 | 6300 | 4000 | 4000 | 3600 | 3600 | 2750 | 2700 |
| Maximum Intermittent Speed nmax [rpm] | 8800 | 8800 | 6900 | 6900 | 4400 | 4400 | 4000 | 4000 | 3000 | 3000 |
| Maximum Inlet Flow qV max (at nnom) [L/min] | 82 | 128 | 177 | 202 | 427 | 500 | 577 | 648 | 550 | 675 |
| Output Torque M (at pnom = 400 bar) [Nm] | 66 | 102 | 179 | 204 | 679 | 796 | 1021 | 1146 | 1273 | 1393 |
| Rotary Stiffness c [kNm/rad] | 0.92 | 1.59 | 2.93 | 3.12 | 11.2 | 11.9 | 17.4 | 18.2 | 57.3 | 73.1 |
| Rotary Group Moment of Inertia JTW [kg·m²] | 0.0004 | 0.0004 | 0.0012 | 0.0012 | 0.0116 | 0.0116 | 0.0220 | 0.0220 | 0.0353 | 0.0610 |
| Maximum Angular Acceleration α [rad/s²] | 5000 | 5000 | 6500 | 6500 | 4500 | 4500 | 3500 | 3500 | 11000 | 10000 |
| Case Fluid Volume V [L] | 0.17 | 0.17 | 0.20 | 0.20 | 0.80 | 0.80 | 1.10 | 1.10 | 2.70 | 2.50 |
| Dry Weight (Approximate) [kg] | 5.4 | 5.4 | 9.5 | 9.5 | 32.0 | 32.0 | 45.0 | 45.0 | 66.0 | 73.0 |
HENGYUHANG HYH2FM Series 6x Ordering Code Structure
| Pos. | Code Segment | Available Options | Description & Engineering Specifications |
|---|---|---|---|
| 01 | Hydraulic Fluid | Omitted E- | Mineral oil and HFD fluids (standard) HFB and HFC water-based fire-resistant hydraulic fluids (requires Long-life bearing L) |
| 02 | Axial Piston Unit | HYH2F | Bent-axis fixed displacement axial piston motor, high-pressure design |
| 03 | Drive Shaft Bearings | Omitted L | Standard heavy-duty mechanical tapered roller bearings (sizes 5–200) Long-life bearing assembly for extended duty cycle and HF fluids (sizes 250–1000) |
| 04 | Operating Mode | M | Motor, open and closed hydrostatic circuits |
| 05 | Nominal Size (NG) | 005 to 1000 | Available displacements: 5, 10, 12, 16, 23, 28, 32, 107, 125, 160, 180, 200, 250, 355, 500, 710, 1000 cm³/rev |
| 06 | Series Index | 6 | Series 6 |
| 07 | Index Version | 1 3 0 | Index 1: Sizes 10 to 180 cm³/rev Index 3: Size 200 cm³/rev Index 0: Size 5 and sizes 250 to 1000 cm³/rev |
| 08 | Direction of Rotation | W | Bi-directional (reversible, viewed on drive shaft) |
| 09 | Sealing Material | V | FKM (Fluorocarbon rubber / Viton seals, high-temperature rating) |
| 10 | Drive Shaft Code | A Z B P C | Splined shaft DIN 5480 (standard high-torque execution) Splined shaft DIN 5480 (alternative diameter/spline tooth count) Parallel keyed shaft DIN 6885 (with key) Parallel keyed shaft DIN 6885 (alternative diameter) Conical shaft with woodruff key (size 5 only) |
| 11 | Mounting Flange | B H | ISO 3019-2 4-hole mounting flange (sizes 5 to 250) ISO 3019-2 8-hole mounting flange (sizes 355 to 1000) |
| 12 | Working Ports A & B | 010 / 017 020 / 027 030 040 100 171 / 181 178 / 188 191 / 192 | SAE working ports at rear (without / with flushing valve 7) SAE working ports lateral opposite (without / with flushing valve 7) Threaded metric ports DIN 3852 lateral opposite (sizes 5–32) Threaded metric ports DIN 3852 lateral and rear (sizes 10–32) SAE working ports at bottom (sizes 28, 32, 107–180) Port plate configured for mounting counterbalance valve BVD / BVE Port plate with mounted counterbalance valve BVD (178) / BVE (188) Port plate with integrated MHDB pressure relief valves (without / with boost) |
| 13 | Speed Sensors | Omitted U / V F / H | Without speed sensor Prepared for DSA speed sensor (U) / DSA speed sensor mounted (V) Prepared for HDD speed sensor (F) / HDD speed sensor mounted (H, size 200) |
| 14 | Special Execution | Omitted J | Standard execution Special slewing drive execution (standard with port plate 19) |
| 15 | Version Suffix | Omitted -Y -S | Standard factory version Installation variant (e.g. customized drain plug configuration) Customer-specific special build |
Example Standard Order Codes: HYH2FM107/61W-VAB010 (Size 107 cm³, Series 61, Bi-directional, Viton Seals, Splined Shaft W45×2, ISO 4-Bolt Flange, Rear SAE 1 1/4" Ports) or HYH2FM160/61W-VAB191 (Size 160 cm³, Port Plate 19 with Integrated MHDB Pressure Relief Valves).
Direct Interchangeability & OEM Cross-Reference Matrix
HENGYUHANG HYH2FM Series 6x fixed displacement hydraulic motors are 100% physically, dimensionally, and hydraulically interchangeable with OEM Bosch Rexroth A2FM Series 6x units, fitting existing machine chassis, gearbox pilots, DIN 5480 splines, and hydraulic piping:
| OEM Rexroth Model Code | HENGYUHANG Replacement Code | Displacement & Flange | Shaft & Ports | Integrated Valve | Interchangeability |
|---|---|---|---|---|---|
| A2FM10/61W-VAB030 | HYH2FM10/61W-VAB030 | 10.3 cm³, ISO Ø80 4-bolt | DIN W25×1.25, Threaded M22 | Without Valve | 100% Drop-In |
| A2FM16/61W-VAB030 | HYH2FM16/61W-VAB030 | 16.0 cm³, ISO Ø80 4-bolt | DIN W25×1.25, Threaded M22 | Without Valve | 100% Drop-In |
| A2FM28/61W-VAB010 | HYH2FM28/61W-VAB010 | 28.1 cm³, ISO Ø100 4-bolt | DIN W30×2, Rear SAE 1/2" | Without Valve | 100% Drop-In |
| A2FM32/61W-VAB020 | HYH2FM32/61W-VAB020 | 32.0 cm³, ISO Ø100 4-bolt | DIN W30×2, Side SAE 1/2" | Without Valve | 100% Drop-In |
| A2FM107/61W-VAB010 | HYH2FM107/61W-VAB010 | 106.7 cm³, ISO Ø160 4-bolt | DIN W45×2, Rear SAE 1 1/4" | Without Valve | 100% Drop-In |
| A2FM107/61W-VAB191J | HYH2FM107/61W-VAB191J | 106.7 cm³, ISO Ø160 4-bolt | DIN W45×2, Rear SAE 1 1/4" | MHDB Relief + Slew Code J | 100% Drop-In |
| A2FM125/61W-VAB020 | HYH2FM125/61W-VAB020 | 125.0 cm³, ISO Ø160 4-bolt | DIN W45×2, Side SAE 1 1/4" | Without Valve | 100% Drop-In |
| A2FM160/61W-VAB010 | HYH2FM160/61W-VAB010 | 160.4 cm³, ISO Ø180 4-bolt | DIN W50×2, Rear SAE 1 1/4" | Without Valve | 100% Drop-In |
| A2FM160/61W-VAB188 | HYH2FM160/61W-VAB188 | 160.4 cm³, ISO Ø180 4-bolt | DIN W50×2, Mounted BVE | BVE Winch Valve | 100% Drop-In |
| A2FM180/61W-VAB010 | HYH2FM180/61W-VAB010 | 180.0 cm³, ISO Ø180 4-bolt | DIN W50×2, Rear SAE 1 1/4" | Without Valve | 100% Drop-In |
| A2FM200/63W-VAB010 | HYH2FM200/63W-VAB010 | 200.0 cm³, ISO Ø200 4-bolt | DIN W50×2, Rear SAE 1 1/4" | Without Valve | 100% Drop-In |
| A2FM250/60W-VZB010 | HYH2FM250/60W-VZB010 | 250.0 cm³, ISO Ø224 4-bolt | DIN W50×2, Rear SAE 1 1/4" | Without Valve | 100% Drop-In |
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