Black drive belt on white background
Black drive belt on white background

A40/4L420 HVAC V-Belt — Replaces Lennox 25W62, Greenheck 345041

Price
$37.99

Frequently Bought Together

Confirm This Fits Your Model
Not sure where to find your model number? See guide →
BELT SLIPPING, SQUEALING OR WORN?

A40/4L420 HVAC V-Belt — Restores Blower Speed & Airflow

42-inch outside-length, 1/2-inch wrapped drive belt with verified OEM and manufacturer cross-reference data.

A40 / 4L42042" Outside Length1/2" Top Width40° Profile
Equipment Fitment: No model-level fitment was added because the audited manufacturer pages identify this as a broad blower-belt size without exposing a reliable model list. Match by the complete A40/4L420 marking, profile and length.

Verified Cross-Reference Information

Industry NumbersA40, 4L420
Lennox Numbers25W62, 100245-17, 25P09
Greenheck345041 (A40), 345069 (4L420)
Gates ClassicalA40, 9002-2040
Gates FHP6842 / 4L420K

Equivalent vs. Alternative Belts

Dimensional FHP EquivalentGates 6842 / 4L420K
Cogged Performance AlternativeAX40 — raw-edge cogged construction; not identical to a wrapped A40/4L420

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 Length42" / 1067 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 42-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

  1. Disconnect and lock out electrical power.
  2. Release belt tension according to the service instructions.
  3. Do not pry the belt over a pulley; create enough slack.
  4. Clean and align the sheaves, then set specified tension.
  5. Rotate by hand, reinstall guards, restore power and test.

Frequently Asked Questions

Are A40 and 4L420 interchangeable?
They are commonly paired as the same nominal 1/2-inch, 42-inch size. Construction and duty rating can still differ by product line.

Can AX40 replace this belt?
AX40 is a related cogged performance alternative, not identical wrapped construction. Verify the equipment permits the change.

✓ Model-Specific Repair Pages

Frigidaire 1 Dishwasher Parts & Repair Guide

Buy Online Pick Up In-Store

Address
101 Trillium Dr
Kitchener, Ontario N2E 1W8
Phone
1-877-899-7278
Hours
Mon–Fri 9 AM–5 PM • Sat 9 AM–1 PM
Get Directions
Map showing warehouse location at 101 Trillium Dr, Kitchener
View on Google Maps

What Customers Say

4.70 ★ (288)
Verified

All brand names are the property of their respective owners and are used for compatibility reference only.

Exact and OEM references: A40, 4L420, Lennox 25W62, Lennox 100245-17, Lennox/Browning 25P09, Greenheck 345041, Greenheck 345069, Gates A40, Gates 9002-2040. Dimensional FHP equivalent: Gates 6842 / 4L420K. Performance alternative: AX40 raw-edge cogged; not identical construction.

For other equipment, match by A40/4L420 marking, 1/2-inch width and 42-inch outside length.