42 inch Lawn Mower Deck Belt for John Deere GX20072 GY20570 Compatible with John Deere 102 105 L100 L105 D100 D110 D120 D130 X110 X125 X145 E100 E110 E120 LA105 LA110 LA115 (1/2" x 104")，2 Pack

What It Is

This is a 42-inch lawn mower deck belt (1/2" x 104") designed to transfer power from the engine pulley to the blade spindles on select John Deere lawn tractors. It’s sold as a 2-pack for quick replacement or backup, compatible with OEM part numbers GX20072 and GY20570.

Fitment & Compatibility

Before buying, confirm your mower has a 42-inch deck and that the belt measures exactly 1/2 inch wide by 104 inches long (measure your old belt if possible). This belt fits many John Deere 100-series, LA-series, E-series, and X-series models, including: 102, 105, L100, L105, D100, D110, D120, D130, X110, X125, X145, E100, E110, E120, LA105, LA110, LA115. Do not assume fit – check your mower’s model number and verify the OEM part reference (GX20072 or GY20570) matches your owner’s manual or current belt. This is an aftermarket belt, not John Deere branded.

Key Things to Buy

• Quality vs OEM: At $24.99 for a 2-pack, this is budget-friendly. Expect reasonable durability, but it may not last as long as a genuine John Deere belt under heavy use or in debris-heavy conditions.
• Installation difficulty: Moderate. You’ll need to release deck tension (spring or lever), route the belt around pulleys and idlers, and re-tension. A diagram or phone photo before removal helps.
• Common gotcha: The belt must be routed exactly per your deck’s pattern. Using the wrong path can cause slipping, premature wear, or blade damage. Also, check that your deck’s pulleys and spindles spin freely – a seized pulley will shred any belt fast.
• Two-pack value: Having a spare is handy, but store the extra belt in a cool, dry place away from sunlight to prevent dry rot.

Should You Buy It

If you have a compatible John Deere model listed above and want a low-cost backup or replacement for light to moderate mowing, this 2-pack is a solid value. For heavy commercial use or if you prioritize maximum belt life, consider a genuine OEM belt instead.