Holdly GX20072 Deck Belt 1/2 x 103'', for John Deere 42'' Deck Mower D100 D105 D110 D125 D130 L100 L110 E100 E110 E120 E130 LA105 LA110 LA115 LA135 1642HS 1742HS, GY20570 Kevlar Mower Belt

What It Is

The Holdly GX20072 is a 1/2 x 103-inch Kevlar-reinforced deck belt designed to drive the blades on 42-inch cutting decks for select John Deere lawn tractors. It’s an aftermarket replacement for OEM part numbers GX20072 and GY20570, commonly used on D100, D105, D110, D125, D130, L100, L110, E100, E110, E120, E130, LA105, LA110, LA115, LA135, 1642HS, and 1742HS models.

Fitment & Compatibility

• Deck size: Must be a 42-inch deck (not 48-inch or other sizes). Measure your deck or confirm the model number.
• Belt dimensions: 1/2 inch wide x 103 inches long. Verify your old belt’s length—if it’s a different measurement, this won’t fit.
• Model check: This belt fits the listed John Deere models, but not all variants (e.g., D140 or LA145 use different belts). Double-check your specific model number and year.
• OEM vs aftermarket: This is a non-OEM replacement. It matches the original GX20072 and GY20570 specs but may have slight differences in material feel or stiffness.

Key Things to Know

• Kevlar construction: The Kevlar reinforcement adds durability and reduces stretching compared to standard rubber belts, but it can be slightly stiffer during installation.
• Installation difficulty: Moderate. You’ll need to remove the deck, release the tensioner pulley, and route the belt around all pulleys per your mower’s diagram. A belt tool helps.
• Common gotcha: If your mower uses a separate spindle belt (some models do), this is the main deck belt only—not a drive or transmission belt.
• Break-in period: Expect some initial noise or dust as the belt seats; this is normal and usually fades after 1-2 hours of use.

Should You Buy It

Yes, if you need a budget-friendly, solid replacement for a John Deere 42-inch deck belt listed above. The Kevlar build offers good value for the price, though it may not last as long as premium OEM belts under heavy use. Best for DIYers and light-to-medium mowing on residential lawns.