Bonfiglioli 716 Gear Reducer
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Product Description
Replacement of ITALY SAI hydraulic motor GM series
GM05,GM1/2/3/4/5/6 SERIES
A range of fixed displacement motors with a design resulting from continuous improvements. High mechanical and volumetic efficiency,
excellent cavitation resistance make them ideal products for any circuit
that requires reliability,high performance, rotation control.
SAI GM3-800 Radial Piston Motor: Comprehensive Overview
TheSAI GM3-800 Radial Piston Motoris a type of low-speed, high-torque (LSHT) hydraulic motor designed for applications requiring robust power transmission, precise control, and durability under heavy loads. Below is a detailed breakdown of its key features, applications, technical specifications, and advantages.
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1. Key Features
• Radial Piston Design:
• Uses a "Geroler" or "five-lobe" (内五星) internal rotor configuration, where pistons are arranged radially around a central axis.
• This design provides high torque output at low speeds, making it ideal for heavy-duty machinery.
• High Efficiency:
• Typically achieves mechanical efficiencies of90–95%and volumetric efficiencies of95–98%, minimizing energy loss.
• Compact & Power-Dense:
• Delivers high torque in a relatively small package, reducing the need for bulky gearboxes.
• Bidirectional Operation:
• Capable of smooth rotation in both clockwise and counterclockwise directions, suitable for reversible applications.
• Robust Construction:
• Features a hardened steel housing, high-precision bearings, and wear-resistant seals for long service life in harsh environments.
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2. Technical Specifications (Example Values – Check Manufacturer’s Data Sheet)
【表格】
Parameter Typical Range (GM3-800) Description
Displacement 800 cc/rev (approx.) Volume of fluid displaced per revolution
Max. Operating Pressure 280–350 bar (4,060–5,075 psi) Suitable for high-pressure hydraulic systems
Max. Speed 300–500 rpm (depending on load) Optimal range for balanced performance
Max. Torque Up to 4,000 Nm (2,950 lb-ft) High torque output even at low speeds
Port Type SAE flange or threaded connections Standard hydraulic fittings
Shaft Configuration Splined or keyed shaft Customizable for different couplings
Weight ~50–70 kg (110–154 lbs) Varies by configuration
(Note: Exact specifications may vary by manufacturer or model variant. Always refer to the official product datasheet.)
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3. Working Principle
• Theradial piston motoroperates by converting hydraulic pressure into mechanical rotation:
1. Hydraulic Fluid Entry: Pressurized fluid enters the motor through the inlet port.
2. Piston Actuation: The fluid pushes against the radial pistons, causing them to move outward.
3. Rotor Rotation: The pistons push against a fixed cam (or "stator"), generating torque that rotates the output shaft.
4. Fluid Exhaust: De-pressurized fluid exits through the outlet port.
• The"five-lobe" (Geroler) designensures smooth, continuous rotation with minimal pulsation.
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4. Applications
TheSAI GM3-800is widely used in industries requiring reliable, high-torque hydraulic power, including:
• Construction Machinery:
• Excavators, loaders, cranes (e.g., swing drives, winches).
• Agricultural Equipment:
• Harvesters, sprayers, tillers (e.g., wheel drives, conveyor systems).
• Material Handling:
• Forklifts, conveyor belts, aerial work platforms.
• Mining & Off-Highway:
• Drills, haul trucks, underground loaders.
• Industrial Machinery:
• Plastic injection molding, metal forming, and presses.
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5. Advantages Over Other Motor Types
【表格】
Feature Radial Piston Motor (GM3-800) Gear Motor Vane Motor
Torque at Low Speed ✅ High ❌ Low ⚠️ Moderate
Efficiency ✅ 90–95% ⚠️ 70–85% ⚠️ 80–90%
Durability ✅ Excellent (heavy-duty) ⚠️ Moderate ⚠️ Moderate
Noise Level ✅ Quiet (low pulsation) ❌ Noisy ⚠️ Moderate
Cost ⚠️ Higher upfront ✅ Lower ✅ Moderate
(Best suited for high-torque, continuous-duty applications where efficiency and longevity are critical.)
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6. Maintenance & Troubleshooting
• Regular Checks:
• Monitor hydraulic fluid cleanliness (ISO 18/16 or better).
• Inspect seals and O-rings for leaks.
• Check shaft play and coupling alignment.
• Common Issues & Fixes:【表格】
Problem Likely Cause Solution
Low torque output Worn pistons or cam Replace worn components
Excessive noise Cavitation (low fluid level) Increase fluid supply pressure
Overheating High internal leakage Rebuild motor or replace seals
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7. Purchasing Considerations
• Genuine vs. Aftermarket:
• Opt forgenuine SAI (or equivalent manufacturer) partsto ensure compatibility and warranty support.
• Customization Options:
• Many manufacturers offer variants with different displacements, shaft configurations, or port sizes.
• Lead Time & Pricing:
• Radial piston motors are often specialty items; expect longer lead times (4–12 weeks) and higher costs than gear motors.
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Conclusion
TheSAI GM3-800 Radial Piston Motoris a high-performance hydraulic motor designed for demanding industrial applications. Itsradial piston design,high torque output, anddurabilitymake it a preferred choice for heavy machinery.
For precise specifications, compatibility checks, or technical support, contact the manufacturer or an authorized distributor.
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hydraulic motor,
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