Cleco MBR377M MB Series Radial Piston Air Motor | 5.5 HP | 150 RPM | 700 (ft-lbs) Stall Torque | Rear Exhaust

When a driven load needs very high torque at low speed, the Cleco MBR377M MB Series Radial Piston Air Motor delivers 5.5 HP pneumatic power with a 150 RPM free speed for controlled rotation on mixers, winches, conveyors, rotary fixtures, and other machine-drive applications. Its radial piston design uses pistons arranged around the drive centerline to generate strong torque at reduced speed, making it useful where air power, stall tolerance, and variable speed control are preferred over a conventional electric motor setup.

The MBR377M provides 700 ft-lbs of stall torque, giving machine builders and maintenance teams substantial overload capability when a load stops, binds, or starts under resistance. With 74 RPM at maximum horsepower and a 20.4:1 gear ratio, this motor is built for low-speed, high-torque work rather than high-speed output. The rear exhaust configuration routes discharge air away from the output end of the motor, which can simplify installation inside guarded equipment or fixed pneumatic machinery.

Type: Radial Piston Air Motor | Series: MB Series | Model: MBR377M | Max Power: 5.5 HP / 4.10 kW | Free Speed: 150 RPM | RPM at Max HP: 74 RPM | Stall Torque: 700 ft-lbs / 949 Nm | Gear Ratio: 20.4:1 | Air Consumption: 154 SCFM | Spindle Type: 3/4" Threaded Spindle | Length: 18.12" | Air Inlet: 1" NPTF | Exhaust: Rear Exhaust | Performance Rating: 90 PSI / 620 kPa

Features:

• Radial piston air motor construction provides high torque output at low operating speeds.
• 5.5 HP maximum power supports machine-drive applications that require pneumatic power instead of electric drive.
• 150 RPM free speed helps control shaft speed on mixers, lifting mechanisms, indexing equipment, and other slower rotating loads.
• 700 ft-lbs stall torque gives the motor strong starting and stopped-load capability for high-resistance applications.
• 20.4:1 gear ratio increases output torque while keeping rotational speed low and manageable.
• Reversible valving supports forward and reverse operation where the driven equipment requires bidirectional rotation.
• Rear exhaust directs discharge air away from the output side of the motor for cleaner integration into machinery.
• 3/4" threaded spindle supports compatible mechanical connection to the driven component or fixture.

Made in USA:

Applications:

• Mixing and agitation systems — driving low-speed shafts where high starting torque and stall tolerance are required.
• Winches, hoists, and lift-assist equipment — supplying controlled pneumatic rotation for pulling, lifting, and positioning systems.
• Industrial machinery integration — powering conveyors, indexing tables, feed mechanisms, and rotary fixtures in compressed-air environments.
• Packaging and production equipment — replacing or supplementing electric motors where air power and reversible rotation are part of the machine design.
• Oil and gas, mining, and marine equipment — supporting air-powered machinery in environments where pneumatic drive may be selected for duty-cycle or installation reasons.

FAQs:

• Q: What type of application is the Cleco MBR377M best suited for?
  A: This motor is best suited for low-speed, high-torque pneumatic drive applications such as mixers, winches, conveyors, indexing machinery, and rotary fixtures. Its 150 RPM free speed and 700 ft-lbs stall torque make it a better fit for controlled power transmission than for high-speed rotation.
• Q: What does 700 ft-lbs stall torque mean?
  A: Stall torque is the torque available when the motor output stops under load. For this model, 700 ft-lbs indicates strong stopped-load capability, which helps when equipment starts under resistance or temporarily binds during operation.
• Q: Is the MBR377M reversible?
  A: Yes. The MBR377M is listed with reversible valving, allowing the motor to operate in both forward and reverse directions when installed with the proper controls and plumbing.
• Q: How much compressed air does this motor require?
  A: The listed air consumption is 154 SCFM, with performance rated at 90 PSI / 620 kPa. The air system should be sized to maintain adequate pressure and flow at the motor while accounting for hose length, fittings, valves, and any other tools sharing the same supply.
• Q: Can this replace an electric motor?
  A: It can be used as a pneumatic alternative when the speed, torque, mounting, spindle connection, and control requirements match the machine. Before substitution, verify rotation direction, duty cycle, air supply capacity, mounting layout, and driven-load torque requirements.

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