BELT SLIPPING, SQUEALING OR WORN?
A41/4L430 HVAC V-Belt — Restores Blower Speed & Airflow
43-inch outside-length, 1/2-inch wrapped drive belt with verified OEM and manufacturer cross-reference data.
A41 / 4L43043" Outside Length1/2" Top Width40° Profile
Verified Equipment Fitment: Verified Lennox model fitment: ZGB048S401, ZGB060S401 and ZCB036S401. Their replacement-parts records list Lennox 25W63 as the A41, 43-inch blower belt.
Verified Cross-Reference Information
Industry NumbersA41, 4L430
Lennox Numbers25W63, 100245-18
Greenheck345212 (A41), 345070 (4L430)
GatesA41; PoweRated 6843 / 4L430K
Equivalent vs. Alternative Belts
Dimensional FHP EquivalentGates 6843 / 4L430K
Cogged Performance AlternativeAX41 — raw-edge cogged construction; not identical to a wrapped A41/4L430
Important: A belt can share the same nominal size while using a different cover, cord, compound or cogged construction. Match the original duty requirement as well as the section and length.
Size & Application Data
Outside Length43" / 1092 mm
Top Width1/2" / 12.7 mm
Nominal HeightApproximately 5/16" to 11/32", depending on manufacturer specification
Typical UsesHVAC blowers, rooftop units, ventilation fans, air handlers, pumps and industrial drives
Common Problems This Belt May Correct
- Startup squeal, chirp or belt slip
- Weak airflow or a blower running below normal speed
- Black belt dust around the sheaves
- A cracked, glazed, stretched, frayed or hardened belt
Check Before Ordering
- Read the complete number printed on the old belt whenever possible.
- Confirm the 1/2-inch A/4L profile and 43-inch outside-length designation.
- Inspect both sheaves for worn, widened, polished or damaged grooves.
- Check shaft alignment, bearing drag and the tensioning system.
Pro Tip: A new belt will not permanently stop noise caused by worn sheaves, misalignment or failing bearings. Correct the drive problem first, then set final tension to the equipment specification.
Installation Notes
- Disconnect and lock out electrical power.
- Release belt tension according to the service instructions.
- Do not pry the belt over a pulley; create enough slack.
- Clean and align the sheaves, then set specified tension.
- Rotate by hand, reinstall guards, restore power and test.
Frequently Asked Questions
Are A41 and 4L430 interchangeable?
They are commonly paired as the same nominal 1/2-inch, 43-inch size. Construction and duty rating can still differ by product line.
Can AX41 replace this belt?
AX41 is a related cogged performance alternative, not identical wrapped construction. Verify the equipment permits the change.
✓ Model-Specific Repair Pages
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Address
101 Trillium Dr
Kitchener, Ontario N2E 1W8
Kitchener, Ontario N2E 1W8
Phone
Hours
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