GM5-16-AE13S-20-L Hydraulic Gear Motor 15.9 cm³/rev 20 MPa

Product Overview

The GM5 series is a representative product line of high-speed hydraulic gear motors, featuring a compact 3-piece structural design. The series includes models GM5-5, GM5-6, GM5-8, GM5-10, GM5-12, GM5-16, GM5-20, GM5-25, and GM5-30, with displacements ranging from 5.2 to 25.0 cm³/rev, operating pressures up to 20–25 MPa, and rated speeds up to 4,000 rpm. These motors are widely used in construction machinery, agricultural equipment, municipal sanitation vehicles, and various industrial applications.

As a professional hydraulic component manufacturer, we provide 100% interchangeable replacement solutions for the GM5 series. Every GM5 series gear motor undergoes 100% performance testing under simulated actual operating conditions—from displacement accuracy and pressure stability to volumetric efficiency—fully benchmarked against industry-leading standards.

The GM5 series features a 3-piece structure consisting of an aluminum alloy front cover, center body, and rear cover, with gears and pressure plates manufactured from alloy steel. Two DU bearings are press-fitted into each of the front and rear covers—DU material is the ideal bearing material for gear motors, significantly extending service life. A pressure plate is installed inside the rear cover, providing axial pressure compensation and radial pressure balancing that substantially enhance motor performance.

Model Code GM5-16-AE13S-20-L Breakdown:

• GM5: Product series code

• 16: Displacement code (15.9 cm³/rev)

• A: Port connection type

• E13: Shaft type (E13 = plain key)

• S: Port thread type (S = metric thread)

• 20: Pressure rating (20 MPa)

• L: Rotation direction — L = Counter-clockwise (viewed from shaft end); R = Clockwise

Note: The above code interpretation is based on industry naming conventions. Please refer to the product technical documentation for exact specifications.

Technical Specifications 

GM5-5

• Theoretical Displacement: 5.2 cm³/rev

• Rated Pressure: 20 MPa

• Maximum Speed: 4,000 min⁻¹

• Theoretical Torque: 16.5 N·m

• Minimum Height: 84 mm

• Weight: 1.9 kg

GM5-6

• Theoretical Displacement: 6.4 cm³/rev

• Rated Pressure: 20 MPa

• Maximum Speed: 4,000 min⁻¹

• Theoretical Torque: 20.3 N·m

• Minimum Height: 86 mm

• Weight: 2.0 kg

GM5-8

• Theoretical Displacement: 8.1 cm³/rev

• Rated Pressure: 20 MPa

• Maximum Speed: 3,600 min⁻¹

• Theoretical Torque: 25.6 N·m

• Minimum Height: 88 mm

• Weight: 2.2 kg

GM5-10

• Theoretical Displacement: 10.0 cm³/rev

• Rated Pressure: 21 MPa

• Maximum Speed: 3,600 min⁻¹

• Theoretical Torque: 31.8 N·m

• Minimum Height: 91.5 mm

• Weight: 2.3 kg

GM5-12

• Theoretical Displacement: 12.6 cm³/rev

• Rated Pressure: 20 MPa

• Maximum Speed: 3,600 min⁻¹

• Theoretical Torque: 39.8 N·m

• Minimum Height: 95.5 mm

• Weight: 2.6 kg

GM5-16

• Theoretical Displacement: 15.9 cm³/rev

• Rated Pressure: 20 MPa

• Maximum Speed: 3,200 min⁻¹

• Theoretical Torque: 50.3 N·m

• Minimum Height: 100.5 mm

• Weight: 3.1 kg

GM5-20

• Theoretical Displacement: 19.9 cm³/rev

• Rated Pressure: 16 MPa

• Maximum Speed: 2,800 min⁻¹

• Theoretical Torque: 63.7 N·m

• Minimum Height: 106.5 mm

• Weight: 3.4 kg

GM5-25

• Theoretical Displacement: 25.0 cm³/rev

• Rated Pressure: 16 MPa

• Maximum Speed: 2,600 min⁻¹

• Theoretical Torque: 79.8 N·m

• Minimum Height: 114.5 mm

• Weight: 3.7 kg

GM5-30

• Theoretical Displacement: Approx. 30 cm³/rev (estimated)

• Rated Pressure: Approx. 16–20 MPa

• Maximum Speed: Approx. 2,400–2,600 min⁻¹

• Note: GM5-30 is an extended model of the GM5 series; please refer to the product nameplate or technical agreement for exact specifications

General Specifications:

• Housing Material: High-strength aluminum alloy

• Gear Material: Alloy steel

• Bearing Type: DU bearings (two press-fitted in each cover)

• Pressure Compensation: Axial pressure compensation + radial pressure balancing

• Port Options: M22×1.5 / G1/2 / G3/4 available

• Output Shaft: Φ15 mm

• Filtration: ISO 4406 20/18

Important Note: The above specifications are compiled from publicly available industry technical data. Different suffix codes represent different port connection types, shaft types, thread standards, and rotation directions. Please refer to the product nameplate or technical agreement for exact specifications.

Key Technical Advantages

1. Ultra-High Speed Performance — Meeting High-Speed Application Demands

The GM5 series achieves rated speeds up to 4,000 rpm, placing it at the forefront of its class among gear motors. GM5-5 and GM5-6 models reach 4,000 min⁻¹ maximum speed, while GM5-8 through GM5-12 achieve 3,600 min⁻¹, meeting diverse high-speed drive requirements.

2. Micro-Compact Structure — Extreme Lightweight Design

The GM5 series features a 3-piece structural design with a minimum height of just 84 mm and exceptionally compact volume. The housing is manufactured from high-strength aluminum alloy, with the lightest model weighing only 1.9 kg. Compared to similar piston motors, the GM5 series achieves 30–40% weight reduction, significantly saving valuable installation space.

3. DU Bearings + Axial/Radial Pressure Compensation — Significantly Enhanced Durability

Two DU bearings are press-fitted into each of the front and rear covers—DU material is the ideal bearing material for gear motors, offering excellent self-lubricating properties and wear resistance that significantly extend service life. A pressure plate is installed inside the rear cover, providing axial pressure compensation and radial pressure balancing that substantially enhance volumetric efficiency and durability.

4. 3-Piece Structural Design — Convenient Maintenance and Low Cost

The GM5 series features a simple 3-piece structure with fewer components, making maintenance extremely convenient. The combination of aluminum alloy housing and alloy steel gears achieves lightweight construction while maintaining strength, reducing both manufacturing and maintenance costs.

5. Excellent Contamination Resistance

The GM5 series demonstrates high tolerance to fluid contamination, meeting ISO 4406 20/18 cleanliness standards. Compared to piston motors, gear motors offer superior contamination resistance, extending service life in harsh operating conditions.

6. Superior Starting Torque Performance

The GM5 series achieves starting torque efficiency exceeding 85%. Low inertia design enables rapid acceleration and deceleration, meeting the demands of frequent start-stop operations.

Application Areas

• Construction Machinery: Small loaders, excavator attachments

• Agricultural Machinery: Harvesters, seeders, crop protection equipment

• Municipal Sanitation Vehicles: Sweepers, wash trucks, garbage trucks

• Industrial Equipment: Plastic machinery, woodworking machinery, environmental equipment

• Special Purpose Vehicles: Dump trucks, municipal vehicle hydraulic systems

• Construction Equipment: Concrete mixers, vibratory compactors

Expert Maintenance Tips

1. Verify Rotation Direction

GM5 series motors must only be operated in the specified rotation direction. In the model code, L = Counter-clockwise (viewed from shaft end), R = Clockwise. Always verify alignment with the driven load’s rotation requirements before installation.

2. First Start-up and Priming

Ensure the motor cavity is fully primed with hydraulic fluid before first start-up. Never start the motor dry—this will cause severe wear or seizure of gears and DU bearings.

3. Fluid Cleanliness Management

Maintain fluid cleanliness to ISO 4406 20/18 or better. Install appropriately rated filters on the motor inlet and regularly inspect filter element condition.

4. Speed and Pressure Limits

• GM5-5 / GM5-6: Rated pressure 20 MPa, maximum speed 4,000 min⁻¹

• GM5-8 / GM5-12: Rated pressure 20 MPa, maximum speed 3,600 min⁻¹

• GM5-10: Rated pressure 21 MPa, maximum speed 3,600 min⁻¹

• GM5-16: Rated pressure 20 MPa, maximum speed 3,200 min⁻¹

• GM5-20 / GM5-25: Rated pressure 16 MPa

Never exceed rated speed or pressure limits—this will cause premature damage to internal components.

5. Port and Line Connections

The GM5 series offers multiple port options including M22×1.5 / G1/2 / G3/4. Ensure reliable line connections during installation to avoid leakage. Inlet and return line diameters should accommodate the motor’s flow requirements to avoid excessive pressure drop.

6. Regular Inspection and Maintenance

Inspect the system filter element condition every 500 operating hours. Regularly monitor the motor for abnormal operating noise and housing temperature—if abnormal noise or excessive temperature rise is detected, shut down immediately for inspection. DU bearings offer excellent self-lubricating properties, but professional service is recommended when significant performance degradation is observed.