A2FE Series Hydraulic Piston Motors
Models: A2FE90/61W-VZL181-K, A2FE90/61W-VZL192J-K, A2FE107/61W-VZL181-S
Product Overview
The A2FE series axial piston hydraulic motors are fixed-displacement motors designed for high-pressure hydrostatic drives in open or closed circuits. These motors feature a spherical piston design with robust construction, providing reliable performance in demanding industrial and mobile applications.
Key Features & Benefits
- High Pressure Operation: Continuous operating pressure up to 32 MPa, with peak pressure tolerance up to 31.5 MPa
- Spherical Piston Design: Self-aligning piston and cylinder block interface reduces wear and enhances efficiency
- Compact Installation: Central flange mounting allows for space-saving integration
- High Power Density: Optimized design delivers high torque output in a compact package
- Low Noise Operation: Optimized flow characteristics ensure quiet performance
- Versatile Circuit Compatibility: Suitable for both open and closed hydraulic circuits
- Long Service Life: Durable construction with high-quality materials
Technical Specifications
| Model |
Displacement (cm³/rev) |
Pressure Rating (MPa) |
Shaft Type |
Weight (Approx.) |
Key Features |
| A2FE90/61W-VZL181-K |
90 |
32 |
Splined |
22-24 kg |
Heavy-duty configuration, extended life |
| A2FE90/61W-VZL192J-K |
90 |
32 |
Splined |
22-24 kg |
Special configuration with enhanced features |
| A2FE107/61W-VZL181-S |
107 |
32 |
Splined |
25-27 kg |
Heavy-duty configuration, standard porting |
Common Specifications:
- Operating Fluid: Mineral-based hydraulic oil (ISO VG 32, 46, 68)
- Operating Temperature Range: -20°C to 90°C (ideal 30-65°C)
- Speed Range: 100-2800 rpm (continuous operation)
- Installation: Flange-mounted with central mounting flange
- Port Connections: SAE standard ports (varies by model suffix)
- Rotation: Bi-directional operation
Model Suffix Explanation
- VZL181-K: Heavy-duty configuration with reinforced components and extended service life
- VZL192J-K: Special configuration with specific porting, sealing, or mounting features
- VZL181-S: Heavy-duty configuration with standard porting arrangement
Applications
- Mobile Machinery: Excavators, wheel loaders, cranes, concrete pump trucks
- Industrial Equipment: Presses, conveyors, material handling systems
- Marine Applications: Winches, propulsion systems, deck machinery
- Construction Equipment: Drilling rigs, pile drivers, compactors
- Agricultural Machinery: Combine harvesters, tractors, irrigation systems
Installation Guidelines
Pre-Installation Checks
- Verify motor shaft rotates freely by hand
- Check for any visible damage during transport
- Ensure mounting surface is clean and flat
- Confirm hydraulic connections match port sizes
Mounting Procedure
- Alignment: Ensure motor shaft aligns with driven equipment without imposing radial or axial loads
- Bolting: Use evenly tightened bolts (recommended torque: 80-100 Nm for M12 bolts)
- Coupling: Use flexible coupling to accommodate minor misalignments
- Port Connections: Use appropriate seals and ensure connections are leak-free
Hydraulic System Requirements
- Fluid Cleanliness: NAS 1638 Class 8 or better (ISO 4406 18/16/13)
- Filtration: Use filters with β₍₁₀₎ ≥ 100
- Oil Viscosity: 27-43 mm²/s at operating temperature
- System Flushing: Flush system before motor installation
Maintenance & Operation
Start-Up Procedure
- Fill system with recommended hydraulic fluid
- Vent air from system (crack connections at highest points)
- Start system at low pressure and check for leaks
- Gradually increase pressure to operating level
- Monitor temperature during initial operation
Routine Maintenance
- Daily: Check for leaks, unusual noise, or vibration
- Weekly: Check oil level and condition
- Every 500 hours: Check filter condition
- Every 1000-3000 hours: Change hydraulic oil (depending on operating conditions)
- Every 2000 hours: Check mounting bolts and connections
Troubleshooting Signs
- Low Speed: Check system pressure and flow
- Overheating: Check oil level, cooling system, and load conditions
- Noise/Vibration: Check for air in system or mechanical issues
- Leakage: Check seals and connections
Frequently Asked Questions
What is the main difference between A2FE90 and A2FE107 models?
The primary difference is displacement: A2FE90 models have 90 cm³/rev displacement, while A2FE107 models have 107 cm³/rev. This means A2FE107 motors can deliver approximately 19% higher torque at the same pressure, making them suitable for applications requiring more power. Physical dimensions and mounting may differ, and flow requirements will be higher for the larger displacement motor.
What does the "VZL181-K" suffix indicate compared to "VZL181-S"?
Both suffixes indicate heavy-duty configurations, but the "K" and "S" endings typically denote different sealing arrangements, porting configurations, or mounting features. The "K" suffix often indicates special sealing or enhanced features, while "S" may indicate standard configuration. The "181" number refers to the specific design variation. Always refer to the manufacturer's documentation for exact differences between these configurations.
What is the torque output difference between A2FE90 and A2FE107 at 25 MPa pressure?
Theoretical torque output is calculated as: Torque (Nm) = Displacement (cm³/rev) × Pressure (MPa) ÷ 20π. At 25 MPa:
A2FE90: ≈ 358 Nm
A2FE107: ≈ 426 Nm
Actual torque will be slightly lower due to mechanical efficiency (typically 92-95%). The A2FE107 provides approximately 19% more torque at the same pressure.
Can A2FE107 motors be used in systems originally designed for A2FE90?
Not without system modifications. The higher displacement requires more hydraulic flow to achieve the same speed, which may exceed the capacity of the existing pump. Additionally, the higher torque output could overload other system components. System redesign, including pump sizing, valve selection, and possibly structural modifications, may be necessary. Always consult a hydraulic specialist before making such changes.
What are the flow requirements for these motors at maximum speed?
Flow requirement (L/min) = Displacement (cm³/rev) × Speed (rpm) ÷ 1000. At the maximum continuous speed of 2800 rpm:
A2FE90: 252 L/min
A2FE107: 300 L/min
These are theoretical values; actual system flow should be slightly higher to account for internal leakage and ensure proper performance. Ensure your hydraulic pump and system components can handle these flow rates at the required operating pressure.
Warranty & Support
These products typically carry a standard warranty period of 12 months from date of installation or 18 months from date of shipment (whichever comes first), subject to proper installation and operation within specified parameters. Warranty terms may vary by manufacturer and region. For technical support, contact authorized service centers with the complete model number and serial number.
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