Ingersoll Rand 7539-B Non-Reversible Air Power Motor provides pneumatic rotary output for machinery requiring a gear-reduced motor with single-direction operation. Rated at 0.25 HP and 900 RPM, this model features double gear reduction to deliver its specified output speed for compatible driven equipment. The non-reversible configuration is intended for applications in which the machine or mechanism operates in a single rotational direction.
The 7539-B develops 5.0 lb-ft stall torque, the torque produced when the applied load prevents the output from rotating. This value provides an important load reference when evaluating the motor for a specific machine. Its combination of 900 RPM output, 0.25 HP rating, and double gear reduction gives OEM designers and maintenance professionals key specifications for matching the air power motor to new equipment or an existing pneumatic drive installation.
Type: Air Power Motor | Model: 7539-B | Rotation: Non-Reversible | Power: 0.25 HP | Speed: 900 RPM | Stall Torque: 5.0 lb-ft | Gear Reduction: Double
Features:
- Pneumatic motor configuration provides rotary output from a compatible compressed-air supply.
- Double gear reduction reduces rotational speed through two stages of gearing to achieve the specified output characteristics.
- 0.25 HP power rating provides a defined reference for matching the motor to compatible machinery and driven mechanisms.
- 900 RPM output supports applications requiring gear-reduced pneumatic rotary motion.
- 5.0 lb-ft stall torque provides a useful load reference when evaluating the motor against equipment requirements.
- Non-reversible configuration supports machinery designed for consistent single-direction rotation.
Made in USA: 
Applications:
- OEM machinery requiring gear-reduced pneumatic rotary power.
- Production equipment designed around single-direction motor operation.
- Machine-building applications compatible with the motor's 900 RPM output and 0.25 HP rating.
- Compressed-air-powered mechanisms where a double gear reduction configuration matches the equipment requirements.
- MRO replacement installations where the 7539-B specifications and mechanical interfaces match the existing motor.
FAQs:
- Q: Is the Ingersoll Rand 7539-B reversible?
A: No. The 7539-B is specified as a non-reversible air power motor for equipment requiring rotation in one direction. - Q: What is the output speed of the 7539-B?
A: The supplied product information specifies an output speed of 900 RPM. - Q: What type of gear reduction does the 7539-B use?
A: This model is specified with double gear reduction, meaning two stages of gearing are used to reduce speed between the motor and its output. - Q: What is the stall torque rating of this air motor?
A: The 7539-B is rated at 5.0 lb-ft stall torque. Stall torque represents the torque developed when the applied load prevents the output from rotating. - Q: What should be checked when replacing an existing air motor with the 7539-B?
A: Verify that the required 0.25 HP rating, 900 RPM output, 5.0 lb-ft stall torque, non-reversible operation, and double gear reduction configuration match the application. Shaft, mounting, dimensional, and compressed-air requirements should also be confirmed against the manufacturer catalog.
| SKU | Spindle | R.P.M. | Torque | Air Consumption at Free Speed | Sound Level at Free Speed | Weight | Gear Reduction | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Free Speed | Load Speed at Max. Hp | Stall | Output at Max. Hp | ||||||||||
| lb-ft | Nm | lb-ft | Nm | SCFM | L/s | dB(A) | lbs | kg | |||||
| Non-Reversible - 0.25 HP | |||||||||||||
| 7538-B | 3/8" Keyed | 550 | 325 | 8.2 | 11.1 | 4.0 | 5.4 | 18.1 | 8.5 | 75 | 1.82 | 0.82 | Double |
| 7539-B | 3/8" Keyed | 900 | 550 | 5.0 | 6.7 | 2.4 | 3.2 | 18.1 | 8.5 | 75 | 1.82 | 0.82 | Double |
| 7540-B | 3/8" Keyed | 2,700 | 1,600 | 1.75 | 2.3 | 0.82 | 1.1 | 18.1 | 8.5 | 75 | 1.52 | 0.68 | Single |
| 7541-B | 3/8" Keyed | 4,500 | 2,700 | 1.05 | 1.4 | 0.49 | 0.66 | 18.1 | 8.5 | 75 | 1.52 | 0.68 | Single |
| 7542-C | 3/8" Keyed | 20,000 | 12,000 | 0.22 | 0.3 | 0.11 | 0.14 | 18.1 | 8.5 | 75 | 1.52 | 0.68 | Single |
| 7533-B | 3/8"-24 Th’d. | 550 | 325 | 8.2 | 11.1 | 4.0 | 5.4 | 18.1 | 8.5 | 75 | 1.82 | 0.82 | Double |
| 7534-B | 3/8"-24 Th’d. | 900 | 550 | 5.0 | 6.7 | 2.4 | 3.2 | 18.1 | 8.5 | 75 | 1.82 | 0.82 | Double |
| 7535-C | 3/8"-24 Th’d. | 2,700 | 1,600 | 1.75 | 2.3 | 0.82 | 1.1 | 18.1 | 8.5 | 75 | 1.52 | 0.68 | Single |
| 7536-B | 3/8"-24 Th’d. | 4,500 | 2,700 | 1.05 | 1.4 | 0.49 | 0.66 | 18.1 | 8.5 | 75 | 1.52 | 0.68 | Single |
| 7537-C | 3/8"-24 Th’d. | 20,000 | 12,000 | 0.22 | 0.3 | 0.11 | 0.14 | 18.1 | 8.5 | 75 | 1.52 | 0.68 | Single |
| Reversible - 0.25 HP | |||||||||||||
| 7543-B | 3/8" Keyed | 550 | 300 | 7.80 | 10.6 | 4.37 | 5.9 | 20.0 | 9.4 | 75* | 1.82 | 0.82 | Double |
| 7544-B | 3/8" Keyed | 900 | 550 | 4.75 | 6.4 | 2.62 | 3.5 | 20.0 | 9.4 | 75* | 1.82 | 0.82 | Double |
| 7545-B | 3/8" Keyed | 2,700 | 1,500 | 1.60 | 2.2 | 0.87 | 1.1 | 20.0 | 9.4 | 75* | 1.52 | 0.68 | Single |
| 7546-B | 3/8" Keyed | 4,500 | 2,400 | 0.98 | 1.3 | 0.55 | 0.7 | 20.0 | 9.4 | 75* | 1.52 | 0.68 | Single |
| 7547-C | 3/8" Keyed | 20,000 | 11,000 | 0.22 | 0.3 | 0.12 | 0.16 | 20.0 | 9.4 | 75* | 1.52 | 0.68 | Single |
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For help selecting the correct Ingersoll Rand Air Power Motors for your assembly application, call (800) 608-5210 or email info@intlairtool.com
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