This is a replacement motor pulley for 36" fans running on 120V power, built for either single-speed (on/off toggle) or dual-speed (high/low toggle) setups. If your evaporative cooler fan pulley is worn, cracked, or slipping, this part restores proper belt tension and airflow.
Evaporative cooler fan pulleys take a steady load cycle - heat, vibration, and belt tension all wear at the composite material over time. This PolarCool replacement pulley is built to standard AK-34 x 5/8 inch bore specifications, so it drops into the motor shaft position the original pulley occupied without modification. Note: If you would like to review the manufacturer Product Specifications, Warranty, Brochure, etc., for this system, please refer to the "Resources (System Manuals and Warranty)" Tab above on this page.
Critical Fitment & Requirements
- Diameter: 36 inches - matches 36" fan motor assemblies only.
- Voltage: 120V systems only.
- Bore/shaft design: AK-34 x 5/8 inch.
- Speed compatibility: Works with single speed (on/off toggle) and dual speed (high/low toggle) configurations.
- NOT compatible with fans outside the 36" diameter family.
- NOT designed for variable-speed or non-toggle fan controllers.
- NOT a universal fit for pulleys with a bore other than AK-34 x 5/8 inch - verify your existing shaft spec before ordering.
Worn shear keys are the hidden reason a "new pulley" job comes back as a callback. When a pulley slips or wobbles on the shaft, the shear key underneath is often already rounded out, and reusing it against a fresh pulley bore accelerates wear on the new part within weeks. Prevent the repeat trip by inspecting the shear key every time you swap a pulley, and replace it with SKU 1019-2417 whenever you see rounding, shear, or play in the keyway. Check shaft-to-pulley alignment with a straightedge or torpedo level before final tightening to avoid belt-tracking issues and vibration transfer into the housing. This follows standard OEM motor-shaft fitment practice: never reuse a compromised shear key against a new pulley bore.
Key Benefits
- Genuine PolarCool replacement component matched to OEM bore specifications.
- Durable composite construction rated for continuous fan operation.
- Supports both single-speed and dual-speed toggle configurations in one part.
- Straightforward shaft-mount installation - no professional labor required.
- Standard AK-34 x 5/8 inch design simplifies fitment verification.
Technical Table
| Spec | Value | Unit |
|---|---|---|
| Type | Replacement Motor Pulley | - |
| Diameter | 36 | in |
| Voltage | 120 | V |
| Speed | Single or Dual Speed | - |
| Bore Design | AK-34 x 5/8 | in |
| Material | Durable composite | - |
Note: See "Resources (System Manuals and Warranty)" Tab above for full specifications.
Compatibility & Fitment
- Fits: 36" fans operating on 120V, with toggle switch controls (single speed on/off, or dual speed high/low).
- Fits: AK-34 x 5/8 inch pulley bore shaft configurations.
- Does NOT fit: fans other than 36" diameter.
- Does NOT fit: variable-speed or non-toggle switch fan control systems.
- Pairs with: shear key SKU 1019-2417, recommended replacement if the existing shear key shows wear.
Compliance & Environment Table
| Item | Detail |
|---|---|
| Material Safety | Durable composite construction, rated for continuous fan operation |
| Electrical Rating | 120V systems only - disconnect power before installation |
FAQ
What fan systems does this motor pulley fit?
This pulley fits 36-inch, 120V PolarCool fans with toggle switch controls, in both single-speed (on/off) and dual-speed (high/low) configurations. It does not fit fans of other diameters or voltages.
What is the bore/shaft design of this pulley?
This pulley uses a standard AK-34 x 5/8 inch design. Confirm your motor shaft matches this spec before ordering.
Do I need to replace the shear key when installing this pulley?
Not always, but if your existing shear key is worn, replace it with SKU 1019-2417 for optimal performance and proper torque transfer.
Can I install this pulley myself?
Yes. Installation involves disconnecting power, removing the old pulley from the motor shaft, aligning and securing the new one, then restoring power to test. No professional certification is required.
Will this pulley work with a variable-speed fan controller?
No. This pulley is designed for toggle-switch fans (single or dual speed) only. It is not rated or designed for variable-speed control systems.
Warranty & Registration
Manufacturer warranty terms for this part are not detailed in the available product data. [NEEDS VERIFICATION] Refer to the "Resources (System Manuals and Warranty)" Tab above for current warranty coverage on this component. Contact us before you order if you need help confirming shaft or bore compatibility - we always reply back.
