RMPX-1300-M2-F11-A2B-B2 Dinamic Radial Piston Motor 1247cc

Product Overview

The RMPX-1300-M2-F11-A2B-B2 is a low-speed high-torque (LSHT) radial piston hydraulic motor from the Italian Dinamic Oil S.P.A. (“Fulmine”/”Lightning” brand) RMPX series. Featuring a proven radial piston architecture, this motor is widely deployed in hydraulic transmission systems for mobile machinery and industrial equipment.

Founded in 1970 and headquartered in Modena, Italy, Dinamic Oil has nearly 50 years of professional experience in power transmission and hydraulic solutions. The RMBX/RMPX series motors are renowned for their low-speed operation, high starting torque, wide speed range, high reliability, high efficiency, long service life, and low noise characteristics.

Designed as a 100% interchangeable direct replacement for the original Dinamic Oil RMPX-1300-M2-F11-A2B-B2, this product matches 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.

Technical Specifications 

• Model: RMPX-1300-M2-F11-A2B-B2

• Series: Dinamic Oil RMPX Radial Piston Hydraulic Motor (“Fulmine”/”Lightning” brand)

• Theoretical Displacement: 1247.5 cm³/rev

• Max Continuous Pressure: 190 bar

• Intermittent Pressure: 220 bar

• Peak Pressure: 250 bar

• Continuous Speed: 150 rpm

• Max Speed: 220 rpm

• Continuous Power: 52.0 kW

• Peak Power: 100.0 kW

• Torque: 1.980 daNm/bar

• Weight: Approx. 75 kg

• Structure Type: Radial piston LSHT motor

• Rotation Direction: Reversible

• Brand: Italy DINAMIC OIL S.P.A. (“Fulmine”/”Lightning” brand)

Note: Pressure and speed parameters may vary across different configurations (shaft type, seal, porting, etc.). Please refer to the corresponding Dinamic Oil technical manual for specific model details.

Key Technical Advantages

1. Radial Piston Design for High Starting Torque Output

The RMPX series employs a proven radial piston architecture that delivers exceptional low-speed high-torque output. High starting torque enables stable high-torque output at extremely low speeds (down to 150 rpm). This makes the motor particularly suitable for heavy-load start-up applications such as injection molding machine screw drives, winch, and drum drives.

2. Wide Speed Range with High Power Density

This model supports a speed range of 150–220 rpm, delivering 52.0 kW continuous power and up to 100.0 kW peak power. The wide speed range enables the motor to meet both low-speed high-torque and higher-speed requirements, significantly enhancing application flexibility.

3. Three-Tier Pressure Rating for Versatile Operating Conditions

The RMPX-1300 offers three pressure grades—190 bar (continuous), 220 bar (intermittent), and 250 bar (peak). This stepped pressure design allows the motor to operate flexibly under varying load conditions: continuous pressure for steady-state operation, intermittent and peak pressures for short-term overload requirements.

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

Manufactured to exact OEM mounting dimensions, porting specifications, and performance standards, this motor achieves 100% interchangeability with the original Dinamic Oil RMPX-1300-M2-F11-A2B-B2. 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 continuous, intermittent, and peak pressure conditions—ensuring long-term reliability in demanding mobile and industrial applications.

6. Low-Noise Operation with Extended Service Life

The RMPX series is recognized for its low noise and long service life characteristics. Optimized internal flow paths and precision-machined critical friction pairs effectively reduce operating noise while extending motor service life. When paired with Dinamic Oil planetary gearboxes, a complete hydrostatic drive solution can be configured.

7. Low Oil Sensitivity with Strong Adaptability

RMPX series motors exhibit low sensitivity to oil quality, maintaining stable operation even in applications with less-than-ideal fluid cleanliness conditions. This makes them particularly advantageous in harsh environments such as mining and construction.

Application Areas

• Construction Equipment: Roller drives, tracked travel mechanism drives

• Mining Equipment: Mining and construction machinery hydraulic drives

• Hoisting & Transport: Crane rotary drives, hoist winch drives

• Injection Molding Machinery: Injection molding machine screw drives

• Marine & Port: Marine deck machinery, drum drives

• Petroleum & Coal Mining: Oil drilling equipment, coal mining machinery hydraulic drives

• Forestry Machinery: Forestry machinery travel and working drives

• Metallurgical Machinery: Heavy metallurgical equipment hydraulic drives

• Geological Drilling: Geological drilling equipment hydraulic drives

Expert Maintenance Tips

1. Pre-Installation Preparation: Before using the RMPX series motor, read and understand the complete Dinamic Oil 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.

2. Case Drain Pressure Monitoring: Radial piston motors are sensitive to housing backpressure. Ensure the case drain line is unobstructed and returns to a separate oil tank to prevent seal damage from excessive housing pressure.

3. Coupling Alignment: Precise alignment between the motor shaft and drive shaft is required with minimal tolerance. After installation, manually rotate the coupling to verify smooth operation.

4. Oil Cleanliness Control: Recommended system filtration not less than ISO 4406 18/13. Regular oil analysis is recommended with filter change intervals adjusted based on contamination levels.

5. Working Pressure Selection: The RMPX-1300 offers three pressure grades (continuous 190 bar / intermittent 220 bar / peak 250 bar). Select the appropriate pressure grade based on the duty cycle of your specific application—avoid prolonged operation at intermittent or peak pressure levels.

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. Gearbox Matching Considerations: The RMPX series is often paired with Dinamic Oil planetary gearboxes. Ensure the motor output torque matches the gearbox input torque rating to prevent overload damage.