Cleco MKW419M MK Series Radial Piston Air Motor | 11 HP | 135 RPM | 1654 (ft-lbs) Stall Torque | Rear Exhaust

When low-speed pneumatic rotation needs very high torque, the Cleco MKW419M gives machinery builders and plant maintenance teams an 11 HP MK Series radial piston air motor with 1,654 ft-lbs of stall torque. Stall torque is the maximum torque produced when the motor is stopped under load, which makes this model useful for powered equipment that may encounter high resistance during startup, mixing, lifting, indexing, or drive-system operation. Its 135 RPM free speed and 14.2:1 gear ratio trade output speed for torque multiplication, helping the motor drive heavier loads than direct-drive MK Series models.

The MKW419M is supplied without valving, meaning direction, start/stop, and speed control are handled through external pneumatic valves selected for the machine or fixture. A 1-1/4" threaded spindle provides the mechanical output connection, while foot mounting supports fixed installation on frames, bases, and machinery structures. Its rear exhaust configuration routes spent air away from the spindle end, helping simplify installation where couplings, guards, or driven components are located near the output shaft.

Type: Radial Piston Air Motor | Series: MK Series | Model: MKW419M | Configuration: Without Valving | Drive: Geared | Max Power: 11 HP / 8.20 kW | RPM at Max HP: 67 RPM | Free Speed: 135 RPM | Stall Torque: 1,654 ft-lbs / 2,243 Nm | Starting Torque: 1,021 ft-lbs / 1,384 Nm | Spindle Type: 1-1/4" Threaded Spindle | Gear Ratio: 14.2:1 | Length: 20.88" | Air Consumption: 288 SCFM / 8.16 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 | Mounting: Foot Mounting | Exhaust: Rear | Operating Pressure: 90 PSI / 620 kPa

Features:

• 11 HP MK Series radial piston motor provides high pneumatic output for machine-mounted drive applications.
• 1,654 ft-lbs stall torque supports high-resistance loads where a lower-speed, higher-torque air motor is required.
• 14.2:1 geared output reduces speed and multiplies torque for heavier drive requirements compared with direct-drive models.
• 135 RPM free speed supports controlled low-speed rotation for equipment that does not require high shaft speed.
• Without-valving configuration allows external pneumatic controls to be selected around the machine’s start, stop, speed, and directional requirements.
• 1-1/4" threaded spindle provides a defined connection point for compatible couplings, adapters, and driven components.
• Foot mounting helps secure the motor to machinery bases, frames, skids, or custom mounting plates.
• Rear exhaust routing directs discharged air away from the output spindle side to help simplify installation layout.

Made in USA:

Applications:

• Mixers and agitators — turning high-resistance shafts where slow pneumatic rotation and high stall torque are required.
• Winches, hoists, and lift-assist equipment — powering mechanical drives that benefit from air motor stall tolerance under load.
• Conveyors and indexing systems — moving fixtures, pallets, or production components at controlled low speeds.
• Industrial machinery integration — replacing or supplementing electric drives in equipment built around compressed air power.
• Oil and gas, marine, and plant maintenance environments — supporting pneumatic drive systems where electrical motor use may be undesirable or where plant air infrastructure is already available.

FAQs:

• Q: What is the main difference between the MKW419M and MKW418M?
  A: The MKW419M is a geared model with a 14.2:1 gear ratio, 135 RPM free speed, and 1,654 ft-lbs stall torque. The MKW418M is direct drive, runs much faster at 1,900 RPM, and has lower stall torque.
• Q: What does “without valving” mean?
  A: It means the motor does not include built-in control valving. The installer must supply compatible external pneumatic valves for start/stop, speed, and directional control as required by the machine.
• Q: How much compressed air does this motor require?
  A: The MKW419M is rated at 288 SCFM at 90 PSI, so it requires a high-flow industrial air system. Always confirm available flow at the motor inlet after piping, hose, regulator, and valve losses are considered.
• Q: Can this air motor stall without damage?
  A: Air motors can generally tolerate stalling better than electric motors because they do not rely on electric windings that can overheat during a stalled condition. The driven equipment, mounting structure, spindle connection, and overhung load still need to be sized for the published stall torque and load limits.
• Q: What does radial piston mean?
  A: A radial piston air motor uses pistons arranged around the motor’s centerline to convert compressed air into rotary output. This design is commonly used where high pneumatic power and strong torque output are needed in machinery drive applications.

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