Ingersoll Rand 3840Q Multi-Vane Reversible Air Motor is designed to provide dependable pneumatic rotary power for industrial applications requiring substantial torque, controlled operating speeds, and bidirectional operation. Part of the 3840 Series, this air motor delivers 1.35 HP with a free speed of 280 RPM. Its durable multi-vane design converts compressed air into smooth, continuous rotary motion, while the reversible configuration enables both clockwise and counterclockwise rotation for equipment that requires flexible directional control.
The 3840Q develops 60 ft-lbs starting torque, providing strong breakaway force to initiate rotation under heavier loads, and 80 ft-lbs stall torque, representing the maximum torque produced when the output shaft is prevented from rotating. This combination of lower operating speed, dependable horsepower, and reversible capability makes the motor well suited for OEM machinery, indexing systems, conveyors, material handling equipment, industrial processing machinery, and other compressed-air powered applications.
Type: Multi-Vane Air Motor | Series: 3840 Series | Model: 3840Q | Rotation: Reversible | Power: 1.35 HP | Free Speed: 280 RPM | Starting Torque: 60 ft-lbs | Stall Torque: 80 ft-lbs
Features:
- Multi-vane air motor design delivers smooth, dependable pneumatic rotary power.
- Reversible configuration provides reliable clockwise and counterclockwise operation.
- 1.35 HP output supports demanding industrial pneumatic drive applications.
- 280 RPM free speed is ideal for applications requiring controlled low-speed operation with increased torque.
- 60 ft-lbs starting torque helps overcome heavy startup loads efficiently.
- 80 ft-lbs stall torque provides a manufacturer-published reference for evaluating maximum torque capability.
- 3840 Series motor integrates easily into compatible OEM machinery and replacement installations.
- Compressed-air operation eliminates the need for electrical power at the motor, making it suitable for facilities utilizing centralized pneumatic systems.
Made in USA: 
Applications:
- OEM machinery requiring reversible pneumatic rotary power.
- Industrial conveyors, indexing equipment, and positioning systems.
- Material handling and processing equipment requiring bidirectional rotation.
- Packaging and production machinery.
- Replacement applications where the published motor specifications match the original equipment.
FAQs:
- Q: Is the Ingersoll Rand 3840Q reversible?
A: Yes. This model is designed to operate in both clockwise and counterclockwise directions for applications requiring bidirectional shaft rotation. - Q: What is a multi-vane air motor?
A: A multi-vane air motor uses sliding vanes inside a rotor to convert compressed air into smooth, continuous rotary motion with consistent power delivery. - Q: What is the rated free speed?
A: The manufacturer specifies a free speed of 280 RPM. - Q: What is the difference between starting torque and stall torque?
A: Starting torque is the torque available to begin rotating a load from rest, while stall torque is the maximum torque developed when the output shaft is prevented from rotating. - Q: What should be verified before installation?
A: Confirm horsepower, free speed, rotation direction, shaft dimensions, mounting arrangement, and compressed-air requirements using the Ingersoll Rand Air Motor Catalog before installation.

| SKU | Max. Power | Speed at Max. Power rpm |
Free Speed rpm |
Starting Torque | Stall Torque | Air Consumption at Max. Power | Weight | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| hp | kw | lb-ft | Nm | lb-ft | Nm | scfm | m³/m | lb | kg | |||
| NON-REVERSIBLE — Direction of rotation is counterclockwise when facing the shaft | ||||||||||||
| 3800M | 1.55 | 1.16 | 520 | 1,100 | 24 | 32.5 | 33 | 44.8 | 48 | 1.36 | 7 1/8 | 3.23 |
| 3800P | 1.45 | 1.08 | 285 | 600 | 42 | 57 | 56.5 | 76.6 | 48 | 1.36 | 8 1/2 | 3.86 |
| 3800Q | 1.45 | 1.08 | 180 | 375 | 62 | 84 | 83.5 | 113 | 48 | 1.36 | 8 1/2 | 3.86 |
| 3800R | 1.45 | 1.08 | 150 | 320 | 72 | 98 | 96 | 130 | 48 | 1.36 | 8 1/2 | 3.86 |
| 3800S | 1.45 | 1.08 | 120 | 255 | 88 | 119 | 118 | 160 | 48 | 1.36 | 8 1/2 | 3.86 |
| 3800U | 1.45 | 1.08 | 105 | 220 | 105 | 142 | 140 | 189 | 48 | 1.36 | 8 1/2 | 3.86 |
| REVERSIBLE | ||||||||||||
| 3840M | 1.40 | 1.04 | 390 | 825 | 23 | 31.2 | 31.5 | 42.7 | 44 | 1.25 | 7 3/8 | 3.35 |
| 3840P | 1.35 | 1.01 | 215 | 440 | 40 | 54.2 | 53.5 | 72.6 | 44 | 1.25 | 8 3/4 | 3.97 |
| 3840Q | 1.35 | 1.01 | 130 | 280 | 60 | 81.4 | 80 | 106 | 44 | 1.25 | 8 3/4 | 3.97 |
| 3840R | 1.35 | 1.01 | 122 | 238 | 69 | 93 | 92 | 125 | 44 | 1.25 | 8 3/4 | 3.97 |
| 3840S | 1.35 | 1.01 | 100 | 190 | 86 | 116 | 115 | 156 | 44 | 1.25 | 8 3/4 | 3.97 |
| 3840U | 1.35 | 1.01 | 83 | 162 | 100 | 135 | 134 | 181 | 44 | 1.25 | 8 3/4 | 3.97 |
Looking for more information about Ingersoll Rand Air Motor? Click here to view the Catalog
For help selecting the correct Ingersoll Rand Air Motors for your assembly application, call (800) 608-5210 or email info@intlairtool.com
warning WARNING: This or other products sold on this website may expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
For more information go to www.P65Warnings.ca.gov
