Cogged Equipment V-Belt AX78, Replaces Dayco AX78GL

The AX78 is a classical raw-edge cogged belt with a 78-inch inside-length designation and approximately 80 inches outside length. It is designed for compatible AX-section sheaves where flexibility and reduced slip are important.

Cross-Reference Information

Related Wrapped-Belt Number

A78 / 4L800 is the related wrapped A-section dimensional alternative. It is not identical construction. Confirm that the equipment permits a raw-edge cogged belt before changing belt construction.

Common Symptoms

• Belt slips, squeals, chirps or runs hot
• Fan, blower, pump or compressor loses speed
• Cracks form between the cogs
• Belt is glazed, frayed, stretched or missing cog material

Check Before Ordering

• Confirm the complete AX78 marking or the exact cross-reference number
• Confirm AX profile: 1/2-inch top width and approximately 5/16-inch height
• Do not confuse inside length with the approximately 80-inch outside length
• Inspect pulley grooves, alignment, bearings and the tensioning system

Installation Notes

1. Disconnect and lock out electrical power.
2. Release belt tension according to the equipment manual.
3. Inspect and clean the sheaves without prying the new belt into place.
4. Align the drive and set belt tension to the manufacturer specification.
5. Rotate by hand, reinstall guards and test operation.

Related Equipment

Common equipment categories include extraction fans, ventilation fans, air handlers, blowers, pumps, compressors, lathes, grinders and general industrial machinery.

Verified Compatible Equipment Models

No manufacturer-published model-level fitment list was verified for this universal AX trade size. Match by the exact belt designation, profile, length system and equipment service specifications.