GM5A Series Hydraulic Motor Specifications

The GM5A series includes four motor variants with displacements of 1000, 1300, 1600, and 2000 cm³/rev. Key dimensional and performance parameters are as follows:

• Bore Diameter: Ranges from 59 mm (1000 cm³) to 82 mm (2000 cm³)
• Stroke Length: Constant at 76 mm for all models
• Specific Torque: Increases with displacement, from 16.20 Nm/bar to 31.30 Nm/bar
• Continuous Pressure: Uniform at 250 bar across all models
• Peak Pressure: Decreases with displacement, from 425 bar (1000 cm³) to 350 bar (2000 cm³)
• Continuous Speed: Varies from 300 rpm (smaller models) down to 200 rpm (largest model)
• Maximum Speed: Ranges from 450 rpm (smallest) to 250 rpm (largest)
• Peak Power: Constant at 120 kW for all variants
• Approximate Mass: 174 kg (likely for the largest model)
• Motor Casing Oil Capacity: 10 liters

Performance and Operational Guidelines

The continuous or average working pressure should be selected based on the desired service lifetime, particularly bearing life. The maximum casing pressure is limited to 5 bar.

Peak and continuous pressures and speeds are specified to optimize motor performance and durability. For example, the 1000 cm³ motor can operate continuously at 250 bar and 300 rpm, with a peak pressure of 425 bar and max speed of 450 rpm.

Bearing Lifetime Considerations

The motor uses standard bearings whose average lifetime (B10 life) is a critical factor in motor service life. The B10 lifetime is approximately five times the basic bearing life (B lifetime).

A graph (not included here) relates bearing lifetime in hours to operating shaft speed (rpm) and pressure (bar). Higher pressures and speeds reduce bearing life, so operating conditions must be chosen accordingly.

Summary of Critical Parameters and Recommendations

• Pressure Selection: Continuous pressure should be chosen to balance performance and bearing longevity.
• Speed Limits: Maximum and continuous speeds vary by motor size and must not be exceeded.
• Peak Power: Uniform across models at 120 kW, indicating design optimization for power output.
• Maintenance: Bearing life is a key maintenance consideration; monitoring operating conditions is essential.
• Oil Capacity: 10 liters of oil in the motor casing is required for proper lubrication and cooling.

This data supports selection and operation of GM5A series hydraulic motors for applications requiring reliable torque and power within specified pressure and speed limits, with attention to bearing life for maintenance planning.