Ingersoll Rand 4840U Reversible Multi-Vane Air Motor is designed to deliver dependable pneumatic rotary power for industrial applications requiring extremely high torque output, controlled low-speed operation, and bidirectional capability. Part of the 4800 Series, this air motor provides 3 HP with a free speed of 170 RPM. Its multi-vane design converts compressed air into smooth, continuous rotary motion, while the reversible configuration allows clockwise and counterclockwise operation for equipment requiring flexible directional control.
The 4840U provides 225 ft-lbs starting torque, offering exceptional breakaway capability to initiate rotation under heavy loads, and 300 ft-lbs stall torque, representing the maximum torque produced when the output shaft is prevented from rotating. With its combination of horsepower, very low operating speed, high torque capability, and reversible functionality, this air motor is suited for OEM machinery, heavy-duty production equipment, rotary drive systems, material handling equipment, and other applications requiring reliable compressed-air power with directional flexibility.
Type: Multi-Vane Air Motor | Series: 4800 Series | Model: 4840U | Rotation: Reversible | Power: 3 HP | Free Speed: 170 RPM | Starting Torque: 225 ft-lbs | Stall Torque: 300 ft-lbs
Features:
- Multi-vane air motor design provides smooth and consistent pneumatic rotary power.
- Reversible configuration allows clockwise and counterclockwise operation for flexible equipment integration.
- 3 HP output provides dependable pneumatic power for compatible industrial machinery.
- 170 RPM free speed offers controlled low-speed operation with exceptional torque capability.
- 225 ft-lbs starting torque provides a manufacturer-published reference for startup torque capability.
- 300 ft-lbs stall torque provides a manufacturer-published reference for maximum torque output under stalled conditions.
- 4800 Series motor design supports OEM integration and replacement applications where specifications match.
- Compressed-air operation provides a practical alternative to electrically powered rotary drives in suitable environments.

Tech Tip: To increase tool performance, extend tool life and lessen repair costs use it with a Filter-Regulator-Lubricator (FRLs)
Made in USA: 
Applications:
- OEM machinery requiring reversible high-torque pneumatic rotary power.
- Heavy-duty industrial processing equipment.
- Rotary drive systems requiring bidirectional operation and controlled low-speed output.
- Material handling and automated equipment applications.
- Replacement installations where motor specifications match the existing equipment requirements.
FAQs:
- Q: Is the Ingersoll Rand 4840U reversible?
A: Yes. This model is specified as a reversible air motor and can operate in both clockwise and counterclockwise directions. - 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 rotary motion. - Q: What is the rated free speed of the 4840U?
A: The manufacturer specifies a free speed of 170 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 produced when the output shaft is prevented from rotating. - Q: What should be verified before installation?
A: Confirm horsepower, speed requirements, rotation direction, shaft dimensions, mounting configuration, and compressed-air requirements using the Ingersoll Rand Air Motor Catalog before installation.

| SKU | MAX. POWER - HP | MAX. POWER - KW | SPEED AT MAX. POWER - RPM | FREE SPEED - RPM | STARTING TORQUE - LB-FT | STARTING TORQUE - NM | STALL TORQUE - LB-FT | STALL TORQUE - NM | AIR CONSUMPTION AT MAX. POWER - SCFM | AIR CONSUMPTION AT MAX. POWER - M³/M | WEIGHT - LB | WEIGHT - KG |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| NON-REVERSIBLE | ||||||||||||
| 4800D | 3.8 | 2.83 | 5,250 | 9,850 | 5.8 | 7.8 | 7.7 | 10.4 | 98 | 2.77 | 15 1/4 | 6.92 |
| 4800K | 3.7 | 2.76 | 821 | 1,538 | 35.3 | 47.8 | 47.0 | 63.7 | 95 | 2.69 | 15 1/4 | 6.92 |
| 4800M | 3.7 | 2.76 | 560 | 1,050 | 51.0 | 69.2 | 69.0 | 93.6 | 95 | 2.69 | 15 1/4 | 6.92 |
| 4800N | 3.7 | 2.76 | 387 | 726 | 75.0 | 102.0 | 100.0 | 136.0 | 95 | 2.69 | 15 1/4 | 6.92 |
| 4800P | 3.5 | 2.61 | 260 | 510 | 98.0 | 133.0 | 131.0 | 178.0 | 95 | 2.69 | 19 3/4 | 8.96 |
| 4800Q | 3.5 | 2.61 | 194 | 375 | 129.0 | 175.0 | 173.0 | 235.0 | 95 | 2.69 | 19 3/4 | 8.96 |
| 4800S | 3.5 | 2.61 | 146 | 275 | 178.0 | 241.0 | 238.0 | 323.0 | 95 | 2.69 | 19 3/4 | 8.96 |
| 4800U | 3.5 | 2.61 | 97 | 185 | 265.0 | 359.0 | 354.0 | 480.0 | 95 | 2.69 | 19 3/4 | 8.96 |
| REVERSIBLE | ||||||||||||
| 4840D | 3.3 | 2.46 | 4,550 | 9,100 | 5.2 | 7.0 | 6.9 | 9.4 | 95 | 2.69 | 15 1/4 | 6.92 |
| 4840K | 3.2 | 2.39 | 711 | 1,429 | 32.0 | 43.4 | 42.7 | 57.9 | 95 | 2.69 | 15 1/4 | 6.92 |
| 4840M | 3.2 | 2.39 | 485 | 975 | 47.3 | 64.0 | 63.0 | 85.4 | 95 | 2.69 | 15 1/4 | 6.92 |
| 4840N | 3.2 | 2.39 | 336 | 675 | 67.7 | 91.7 | 90.2 | 122.0 | 95 | 2.69 | 15 1/4 | 6.92 |
| 4840P | 3.0 | 2.24 | 228 | 475 | 93.0 | 126.0 | 125.0 | 170.0 | 95 | 2.69 | 20 1/8 | 9.13 |
| 4840Q | 3.0 | 2.24 | 167 | 350 | 123.0 | 167.0 | 165.0 | 224.0 | 95 | 2.69 | 20 1/8 | 9.13 |
| 4840S | 3.0 | 2.24 | 125 | 255 | 161.0 | 218.0 | 215.0 | 292.0 | 95 | 2.69 | 20 1/8 | 9.13 |
| 4840U | 3.0 | 2.24 | 83 | 170 | 225.0 | 305.0 | 300.0 | 407.0 | 95 | 2.69 | 20 1/8 | 9.13 |
Looking for more information about Ingersoll Rand Motor? Click here to view the Catalog.
For help selecting the correct Ingersoll Rand 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
