Cleco MKW420M MK Series Radial Piston Air Motor | 11 HP | 375 RPM | 606 (ft-lbs) Stall Torque | Rear Exhaust

Built for low-speed, high-torque drive applications, the Cleco MKW420M MK Series Radial Piston Air Motor delivers 11 HP at a controlled 375 RPM free speed, giving equipment builders and maintenance teams substantial turning force without relying on an electric motor. Its radial piston design uses multiple pistons arranged around the motor axis to generate high torque at low speeds, making it well-suited for machinery that requires steady rotation under load. With 606 ft-lbs stall torque, 374 ft-lbs starting torque, and a 5.2:1 gear ratio, this motor is built for applications such as mixers, winches, hoists, turntables, and other air-driven equipment where torque capacity matters more than high rotational speed.

The MKW420M is supplied without valving, allowing integrators to configure external control components around the machine or process. A 1-1/4" threaded spindle provides the mechanical connection point for compatible driven equipment, while foot mounting supports stable installation on frames, bases, and fabricated mounting plates. Rear exhaust helps route spent air away from the drive end, and the motor is performance rated at 90 PSI air pressure for consistent comparison across Cleco MK Series models.

Type: Radial Piston Air Motor | Series: MK Series | Model: MKW420M | Max Power: 11 HP / 8.20 kW | RPM at Max HP: 183 RPM | Free Speed: 375 RPM | Stall Torque: 606 ft-lbs / 822 Nm | Starting Torque: 374 ft-lbs / 507 Nm | Gear Ratio: 5.2:1 | Spindle Type: 1-1/4" Threaded Spindle | Mounting: Foot Mounting | Valving: Without Valving | Exhaust: Rear Exhaust | Air Consumption: 299 CFM / 8.47 m³/min | Air Inlet: 1-1/4" NPTF | Weight: 230 lbs / 104.3 kg | Max Overhung Load at Stall: 2,800 lbs / 1,270 kg | Rated Air Pressure: 90 PSI / 620 kPa

Features:

• Radial piston air motor construction provides strong torque output at lower operating speeds for machinery that must rotate under load.
• 11 HP maximum power rating supports high-demand drive applications where smaller pneumatic motors may not provide enough output.
• 375 RPM free speed and 183 RPM at maximum horsepower give buyers a practical speed range for controlled equipment drive applications.
• 606 ft-lbs stall torque provides the holding and turning force needed when the driven load slows or resists rotation.
• 5.2:1 gear ratio reduces output speed while multiplying torque for low-speed, high-load operation.
• 1-1/4" threaded spindle allows connection to compatible couplings, fixtures, or driven machine components.
• Supplied without valving for integration into systems that use separately specified directional, throttle, or control valves.
• Available Cleco valve options include Reverse Valve Kit MAK70477 and Single Direction Valve 90A39, with fitting 63J11 also required for the single direction valve.

Made in USA:

Applications:

• Industrial machinery integration — powering mixers, rotating fixtures, indexing tables, and mechanical drives that require steady torque at moderate speed.
• Material handling equipment — driving hoists, winches, lift-assist mechanisms, and related air-powered systems when properly configured by the equipment builder.
• Manufacturing and process equipment — supporting production machinery where pneumatic drive is preferred over electric drive due to air-system availability or control requirements.
• Maintenance and MRO retrofits — replacing or reconfiguring motor drives on existing equipment when the mounting, spindle, torque, and air supply requirements match.
• Oil, gas, marine, and mining support equipment — powering rugged auxiliary machinery where compressed air is already part of the site infrastructure.

FAQs:

• Q: What does “without valving” mean on the Cleco MKW420M?
  A: It means the motor is supplied without an integral directional or throttle valve. The system designer or installer must provide compatible external valving based on how the motor will be started, stopped, throttled, or reversed.
• Q: What size air supply does this motor require?
  A: Cleco lists air consumption at 299 CFM, with performance rated at 90 PSI. This is a high-air-demand pneumatic motor, so the compressor, receiver, piping, filtration, and lubrication setup must be sized for sustained flow, not just pressure.
• Q: Is stall torque the same as normal running torque?
  A: No. Stall torque is the torque available when the motor is loaded to the point that rotation stops. For machine design, compare stall torque, starting torque, operating speed, and the torque required by the driven load before selecting the motor.
• Q: Can this replace an electric motor?
  A: It may be used in place of an electric motor when the mounting, speed, torque, spindle connection, and air supply requirements match the application. Final selection should be verified by an engineer or equipment integrator because pneumatic motors behave differently than electric motors under load.
• Q: Does the MKW420M need lubrication?
  A: Yes. Cleco notes that the motor must be filled to the proper level before operation and specifies non-detergent mineral oil suitable for pneumatic motor lubrication. Follow Cleco service instructions for oil type, fill level, and maintenance intervals.

Looking for more information about Cleco Air Motor? Click here to view the Catalog

Need help selecting the correct Cleco Air Motors for your application? Please call (800) 608-5210 or email info@intlairtool.com