Evaporator Cooler (Swamp Cooler) 3¾" x ½" Variable Motor Pulley, 6149

Dial Variable Motor Pulley | 3¾" Diameter x ½" Bore | 1/2–3/4 HP | For Evaporative Coolers | Part #6149

Fine-tune your evaporative cooler’s airflow with this brand-new Dial Manufacturing variable motor pulley, part #6149. Designed for use with ½ HP or ¾ HP motors, this adjustable pulley allows precise control of blower speed to match system air resistance. Built from durable cast metal and engineered for long-term performance, it’s ideal for residential and commercial swamp cooler systems.

⚙️ Product Features:

• Diameter: 3¾"
• Bore Size: ½"
• ⚡ Motor Compatibility: ½ HP or ¾ HP direct drive motors
• Material: Cast metal for strength and corrosion resistance
• Adjustability: Variable pulley opens 2½ to 5 full turns
• Condition: Brand New – Unused

✅ Compatible With:

• Residential and commercial evaporative (swamp) coolers
• Direct drive blower systems with ½" motor shafts
• OEM replacement for standard 3¾" variable pulleys

️ Installation Tips:

• Disconnect power before servicing motor or pulley
• Mount pulley onto motor shaft and tighten set screw securely
• Open pulley 2½ to 5 full turns depending on airflow resistance
• Test motor operation—if motor cycles (starts/stops), open pulley further
• If cycling persists at full open, switch to next size smaller pulley
• Always follow cooler manufacturer’s recommended pulley size

⚠️ Installation Disclaimer:

This pulley is intended for use by experienced technicians or qualified installers. Buyer is responsible for verifying compatibility with motor shaft size and cooler specifications. Improper adjustment may result in motor overheating, cycling, or reduced airflow. Returns are not accepted on installed or used pulleys due to wear and contamination risks.

Adjustable airflow. Reliable cooling. Built for Dial-quality evaporative performance.