GM Series Radial Piston Motor | GM05 GM1 GM2 to GM9 | Low Speed High Torque

The GM Series from LIC Hydraulic is a classic crankshaft and connecting rod type radial piston motor. Ranging from the compact GM05 to the massive GM9, this series is engineered for Low Speed High Torque (LSHT) applications where precision and power are paramount. These motors maintain smooth, ripple-free rotation even at speeds as low as $1\text{ rpm}$. We guarantee 100% mechanical interchangeability with global brands and subject every unit to 100% startup efficiency and high-pressure case integrity tests, ensuring reliability at operating pressures up to $350\text{ bar}$.

Technical Configuration Details

• Displacement Range: From $60\text{ cc/rev}$ to over $12,000\text{ cc/rev}$.

• Torque Output: Exceptional power-to-weight ratio with high intermittent pressure ratings.

• Starting Efficiency: Optimized hydrostatic balancing provides $90\%+$ starting torque efficiency.

• Design: Symmetrical radial piston (5 or 7 pistons) for neutralized radial forces and longevity.

Key Technical Advantages

• High Starting Torque: The hydrostatic balance between the connecting rod and the crankshaft minimizes friction, allowing the motor to start smoothly under full load without stalling.

• Smooth Low-Speed Performance: The GM series eliminates the “cogging” effect common in other designs, providing consistent velocity for critical tasks like hoisting or injection molding.

• Rugged Durability: Built with high-tensile ductile iron housings and hardened crankshafts, these motors thrive in environments with heavy shock loads and frequent reversals.

• Direct Drive Capability: Due to their immense torque capacity, GM motors often eliminate the need for gearbox reducers, streamlining the drive train and reducing overall maintenance costs.

Application Areas

• Marine & Offshore: Anchor winches, deck cranes, and mooring systems.

• Plastic Machinery: Screw drives for injection molding machines and heavy extruders.

• Construction: Rotary head drives for drilling rigs and heavy track propulsion.

• Mining & Material Handling: Feeder drives and large conveyor head pulleys.

Expert Maintenance Tips

• Case Priming: Before initial operation, the motor case must be completely filled with hydraulic oil through the highest drain port. This ensures the crankshaft and rod assemblies are fully lubricated from second one.

• Drain Line Management: The case drain must be piped directly to the tank with minimal back-pressure (ideally below $1.5\text{ bar}$). Excessive case pressure will damage the shaft seal and disturb the internal balance.

• Vertical Installation: If the motor is mounted vertically, ensure that air is properly bled from the upper sections of the housing to prevent air pockets from starving the top bearings of oil.