🔴 3261 U.S. MOTORS Circulator Pump Motor – 3/4 HP, 1725 RPM, 115/208-230V, 56YZ
The 3261 Hot Water Circulating Pump Motor from U.S. Motors (Nidec) is a heavy-duty OEM-grade replacement motor designed for hot water boiler and booster pump applications. Built to deliver high torque, quiet operation, and long service life, this motor is ideal for demanding residential and commercial hydronic systems.
Finished in signature red enamel for hot water identification, the 3261 matches OEM electrical, mechanical, and performance specifications. Its resilient mounting system and all-angle thrust sleeve bearings allow for flexible installation while maintaining smooth, vibration-free operation.
Direct Replecement for Armstrong 811757-002 / 811757-033 / 116641-062
✅ Key Features
🟢 3/4 HP high-output motor for demanding circulation applications
🟢 1725 RPM speed for proper flow and pressure
🟢 Dual voltage operation – 115 / 208-230V
🟢 56YZ frame (OEM hot water circulator configuration)
🟢 Reversible rotation for installation flexibility
🟢 Automatic reset thermal overload protection
🟢 Sleeve bearings with all-angle thrust system
🟢 Resilient hub rings reduce vibration and noise
🟢 Special balance design for quiet operation
🟢 Class B insulation & ODP enclosure
🟢 Red paint finish indicates hot water system use
🟢 Matches OEM performance and mechanical features
📊 Specifications Table
| Specification | Details |
|---|
| Part / Catalog Number |
3261 |
| Model Number |
T55CXTJN-1239 |
| Horsepower |
3/4 HP |
| Speed |
1725 RPM |
| Voltage |
115 / 208-230 VAC |
| Phase / Frequency |
Single-Phase / 60 Hz |
| Full Load Amps |
8.2A (115V) / 4.7–4.2A (208-230V) |
| Frame |
56YZ (some listings may reference 48YZ) |
| Enclosure |
Open Drip-Proof (ODP) |
| Rotation |
Reversible |
| Service Factor |
~1.5 |
| Insulation Class |
Class B |
| Bearings |
Sleeve bearings, all-angle thrust |
| Ambient Rating |
40°C / 104°F |
| Thermal Protection |
Automatic reset |
| Finish |
Red (hot water rated) |
🔁 Cross Reference Table
| Brand | Part Number |
|---|
| Armstrong Pumps |
811757-002 |
| Armstrong Pumps |
811757-033 |
| Armstrong Pumps |
116641-062 |
⚠️ Common Symptoms This Motor Fixes
-
Circulator pump not starting
-
Motor overheating or tripping overload
-
Loud or excessive vibration
-
Reduced water flow or pressure
-
Intermittent or weak circulation
-
Failed or discontinued OEM motor
❓ Frequently Asked Questions (FAQ)
Q: Is the 3261 a direct replacement motor?
A: Yes. It is designed to match OEM shaft, frame, voltage, and performance requirements for the listed Armstrong replacements.
Q: Can this motor be wired for multiple voltages?
A: Yes. It supports 115V and 208-230V single-phase operation.
Q: Is this motor intended for hot water systems?
A: Absolutely. The red finish, Class B insulation, and bearing system are specifically engineered for hot water boiler and booster pump applications.
Q: Does it include overload protection?
A: Yes. The motor includes an automatic reset thermal overload protector.
Q: Is rotation adjustable?
A: Yes. The motor features reversible rotation to match pump requirements.
🧭 Shopping Tips
-
✔️ Verify frame size (56YZ) and shaft dimensions before ordering
-
✔️ Confirm available supply voltage at the installation site
-
✔️ Match horsepower and RPM to the original motor
-
✔️ Designed for hot water circulation only
-
✔️ Professional installation recommended
