GM5 SERIES

The GM5 Series from SAI Hydraulics represents one of the highest displacement ranges in SAI’s modular radial piston motor lineup. Engineered for ultra-high torque, low-speed, and continuous-duty applications, the GM5 Series is purpose-built for extremely demanding environments, combining rugged construction with outstanding performance consistency.

Product Description

Designed with a hydrostatically balanced rotating group, the GM5 Series minimizes internal friction and maximizes service life, even under high-pressure operation. The radial piston design offers excellent torque characteristics, especially at startup or low-speed ranges. The modular construction supports customization with dual displacement control, integrated multi-disc brakes, and auxiliary hydraulic functions.

Key Features

• Very large displacement radial piston motor for extreme torque output

• Hydrostatically balanced internals to reduce wear and maintain high mechanical efficiency

• Low-speed, high-load operation with stable and smooth performance

• Modular build allowing for optional brakes, displacement control, and sensors

• Heavy-duty construction designed for continuous use in harsh industrial and mobile environments

• Consistent volumetric and mechanical efficiency even under varying loads and pressure spikes

Technical Specifications

• Displacement range: Typically exceeds 2,000 cc/rev (specific capacity depends on variant and configuration)

• Max operating pressure: Up to 450 bar

• Speed range: Ideal for very low-speed, high-torque applications

• Torque output: Extremely high, suitable for direct drives in heavy-duty systems

• Mounting interface: ISO, SAE, or customized options

• Shaft types: Keyed, splined, or customer-specific designs

• Optional features:

  • Dual displacement functionality

  • Integrated or flange-mounted parking brakes

  • Speed sensing elements (encoders)

  • Flushing and control valves

Applications

The GM5 Series is intended for the most extreme load and environmental conditions. It is commonly used in:

• Tunnel boring machines

• Offshore and subsea equipment

• Large-capacity marine winches and anchor handling systems

• Steel mill drives and heavy-duty conveyors

• Mining machinery and rock crushers

• High-torque rotary actuators in construction and industrial applications