JMDG16-1600 Radial Piston Hydraulic Motor 1648cc 25MPa

Product Overview

The JMDG16-1600, JMDG16-1800, and JMDG16-2000 are crankshaft connecting rod radial piston hydraulic motors from the JMDG16 family (also known as “external five-star motors”)—low-speed high-torque (LSHT) radial piston hydraulic motors. The series features a five-piston eccentric shaft structure with five pistons radially arranged at 72° intervals in a five-star configuration.

The JMDG series motors are designed and manufactured according to Italian standards with adaptations for the Chinese market. Key components are machined on imported machining centers and CNC equipment, with castings produced using ductile iron precision casting. All seals and high-strength fasteners are imported from Germany, Italy, and Taiwan. The series covers a wide displacement range from JMDG1 to JMDG160, with the JMDG16 series covering displacements from 1375 to 3029 cc/rev.

Designed as 100% interchangeable direct replacements for original JMDG16 series motors, these products match OEM specifications in mounting dimensions, porting interfaces, and performance characteristics. Every unit undergoes 100% simulated duty cycle testing prior to shipment, validating volumetric efficiency, mechanical efficiency, and sealing integrity under actual operating load conditions.

The JMDG series is widely applied in hydraulic transmission systems for injection molding machinery, marine equipment, hoisting machinery, construction equipment, building machinery, coal mining machinery, mining equipment, metallurgical machinery, petrochemical, and port machinery.

Technical Specifications 

JMDG16-1600

• Model: JMDG16-1600

• Series: JMDG16 Crankshaft Connecting Rod Radial Piston Motor (External Five-Star Motor)

• Theoretical Displacement: 1648 ml/r

• Rated Pressure: 20–25 MPa

• Peak Pressure: 25–32 MPa

• Rated Torque: 4874–6158 N.m

• Theoretical Torque: 244–262 N.m/MPa

• Speed Range: 2–320–400 r/min

• Max Continuous Power: 110 kW

• Weight: Approx. 160 kg

• Structure Type: Crankshaft connecting rod radial piston, five-piston eccentric shaft

• Rotation Direction: Reversible

JMDG16-1800

• Model: JMDG16-1800

• Series: JMDG16 Crankshaft Connecting Rod Radial Piston Motor (External Five-Star Motor)

• Theoretical Displacement: 1814–1815 ml/r

• Rated Pressure: 20 MPa

• Peak Pressure: 25 MPa

• Rated Torque: 5367–5433 N.m

• Theoretical Torque: 268–283 N.m/MPa

• Speed Range: 2–320–350 r/min

• Max Continuous Power: 110 kW

• Weight: Approx. 160 kg

• Structure Type: Crankshaft connecting rod radial piston, five-piston eccentric shaft

• Rotation Direction: Reversible

JMDG16-2000

• Model: JMDG16-2000

• Series: JMDG16 Crankshaft Connecting Rod Radial Piston Motor (External Five-Star Motor)

• Theoretical Displacement: 2034–2035 ml/r

• Rated Pressure: 18–20 MPa

• Peak Pressure: 20–22.5–25 MPa

• Rated Torque: 5416–6030 N.m

• Theoretical Torque: 301–323 N.m/MPa

• Speed Range: 2–250 r/min

• Max Continuous Power: 110 kW

• Weight: Approx. 160–170 kg

• Structure Type: Crankshaft connecting rod radial piston, five-piston eccentric shaft

• Rotation Direction: Reversible

Key Technical Advantages

1. Crankshaft Connecting Rod Radial Piston Design for Extreme Torque Output

The JMDG16 series employs a crankshaft connecting rod radial piston architecture with five radially arranged pistons at 72° intervals. The piston bottoms feature hydrostatic balance design, with rolling bearings between pistons and crankshaft for torque transmission, reducing friction losses during operation. The JMDG16-1600 delivers 4874–6158 N.m rated torque, while the JMDG16-2000 delivers 5416–6030 N.m rated torque.

2. High Starting Torque with Superior Efficiency

Starting mechanical efficiency reaches 0.92 or higher, ensuring reliable torque output during heavy-load start-up. Rolling bearing support between the crankshaft and connecting rods further enhances mechanical efficiency.

3. Excellent Low-Speed Stability with Wide Speed Range

With optimized structural design reducing friction losses and improving sealing performance, JMDG series motors deliver exceptional low-speed stability—operating smoothly at speeds as low as 1–2 r/min, with a speed regulation ratio up to 1000. Speed ranges from 2 to 400 r/min.

4. 100% Interchangeability – Zero-Modification Drop-In Replacement

Manufactured to exact OEM mounting dimensions, porting specifications, and performance standards, these motors achieve 100% interchangeability with original JMDG16 series units. No machine modifications are required—simply replace and resume operation, minimizing downtime and reducing maintenance costs.

5. 100% Simulated Duty Cycle Testing for Extreme Environment Reliability

Every motor undergoes 100% simulated duty cycle testing before shipment, validating performance under rated and peak pressure conditions—ensuring long-term reliability in demanding mobile and industrial applications.

6. High Volumetric Efficiency with Low Leakage Design

The simple and reliable planar distribution valve improves sealing performance. Plastic piston rings between pistons and cylinders ensure minimal leakage, achieving volumetric efficiency up to 0.98. This significantly reduces internal leakage and improves overall system efficiency.

7. Precision Casting with Imported Machining – Quality Assurance

Castings utilize ductile iron precision casting, with critical components machined on imported machining centers and CNC equipment. High-capacity bearings ensure reliable operation, long life, and low noise. The drive shaft accepts radial loads with reversible rotation.

Application Areas

• Injection Molding Machinery: Screw drives (Haitian injection molding machines, etc.)

• Marine Industry: Marine anchor winches, winch drives

• Hoisting Machinery: Hoists, crane slewing and hoisting drives

• Construction Equipment: Excavator travel drives, tracked travel mechanisms, rotary mechanism drives

• Building Machinery: Concrete mixers, tower crane slewing drives

• Mining Equipment: Mine hoists, mining transport equipment travel drives

• Metallurgical Machinery: Metallurgical equipment hydraulic drives

• Petrochemical: Oil drilling equipment, chemical machinery hydraulic drives

• Port Machinery: Port cranes, winch drives

Expert Maintenance Tips

1. Housing Pressure Limits: JMDG series motor housing working pressure is 0.1 MPa, with maximum pressure of 0.5 MPa. Ensure the case drain line is unobstructed during installation to prevent seal damage from excessive housing pressure.

2. Pre-Installation Preparation: Before using the JMDG16 series motor, read and understand the complete instruction manual. For first commissioning, fill the motor housing with hydraulic fluid using a filling unit with filtration not less than 10 µm. Never operate the motor without fluid.

3. Working Pressure Selection: JMDG series hydraulic motors have continuous working rated pressures of 16 MPa, 20 MPa, 25 MPa, and 32 MPa. Select the actual working pressure based on the motor’s service life requirements.

4. Oil Temperature Control: Ensure the hydraulic system operating oil temperature remains within the recommended range (20–80°C) to prevent viscosity reduction and seal degradation from excessive temperatures.

5. Seal Maintenance: Use OEM-specification imported seals to ensure sealing performance and service life.

6. Regular Inspection Schedule: Regular inspection of the hydraulic system and motor is recommended. Check hydraulic fluid level daily and monitor operating temperature, noise levels, and case drain flow regularly. Abnormal increases may indicate internal wear or seal degradation.

7. Rotation Direction: JMDG series motors feature reversible rotation—confirm inlet/outlet port connections based on actual requirements during installation.

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