B317 MARATHON 1/2 HP 1725 RPM 56 Frame Motor – Single Phase, 115/208-230V, Leeson Model Q56C17D2072N
The B317 MARATHON General Purpose Motor by Leeson is a high-quality ½ HP single-phase motor designed for reliable performance in HVAC systems, pumps, fans, and industrial machinery. Constructed with a durable steel frame, automatic thermal protection, and a capacitor start design, it ensures smooth operation and a long service life.
⚠️ Note: Small-frame motors below 182T, including this model, are now manufactured under the LEESON brand, maintaining the same quality, plant, and technical support.
⚙️ Key Features
✅ ½ HP Power – Ideal for small to medium HVAC and pump applications
✅ Capacitor Start Induction Run – Reliable startup and continuous operation
✅ Drip-Proof Enclosure (DP) – Protects motor components from dust and moisture
✅ Ball Bearings – Permanently lubricated, double-sealed for long service life
✅ Automatic Thermal Protection – Guards against overheating
✅ Heavy-Duty Steel Frame – Built for durability and vibration resistance
✅ UL & CSA Certified – Meets North American safety and performance standards
📊 Technical Specifications
| Specification | Detail |
|---|
| Brand |
Leeson / MARATHON |
| MARATHON Part Number |
B317 |
| Leeson Model |
Q56C17D2072N |
| Horsepower |
½ HP |
| Speed (RPM) |
1725 |
| Frame Size |
56 |
| Voltage |
115 / 208–230V |
| Phase |
Single |
| Frequency |
60 Hz |
| Full Load Amps (FLA) |
8.0 / 4.1–4.0 |
| Motor Type |
Capacitor Start – Induction Run |
| Enclosure Type |
Drip Proof (DP) |
| Mounting Style |
Resilient Base / Extended Studs |
| Shaft Diameter |
5/8 in |
| Shaft Length |
1.88 in |
| Rotation |
Selective CCW |
| Insulation Class |
B |
| Bearing Type |
Ball |
| Thermal Protection |
Automatic |
| Duty Cycle |
Continuous |
| Service Factor |
1.25 |
| Ambient Temperature |
40°C / 104°F Max |
| Orientation |
Horizontal |
| Capacitor Included |
Yes |
| Certifications |
UL Listed / CSA Certified |
🧭 Applications
-
HVAC blower and fan systems
-
Pumps and compressors
-
Conveyors and industrial machinery
-
General-purpose mechanical equipment requiring ½ HP, 1725 RPM motors
⚠️ Common Symptoms / When to Replace
-
Motor hums or fails to start
-
Overheating or tripping thermal protection
-
Excessive vibration or unusual noise
-
Reduced speed or sluggish operation
-
Shaft or housing shows corrosion or damage
❓ Frequently Asked Questions (FAQ)
Q1: What type of motor is this?
A: Capacitor Start Induction Run – designed for single-phase power with strong startup torque.
Q2: Can I operate this on both 115V and 230V?
A: Yes, it supports dual-voltage operation (115V or 208–230V).
Q3: Does it include a capacitor?
A: Yes, a start capacitor is included for proper motor function.
Q4: What direction does it rotate?
A: Selective counterclockwise (CCW); rotation can be changed via wiring.
Q5: What maintenance is required?
A: Minimal. Bearings are permanently lubricated; enclosure protects against debris.
Q6: Can it be used outdoors?
A: Not recommended. Designed for indoor use or protected environments.
🛒 Shopping Tips
-
Verify frame size (56) and shaft dimensions before ordering
-
Confirm voltage and rotation direction for your equipment
-
Ideal replacement for older ½ HP, 1725 RPM motors
-
Perfect for HVAC, fans, pumps, and general-purpose machinery
