GX20006 Transmission Drive Belt 1/2" x 89" Compatible with John Deere D110, D120, D125, D130, D140, D155, D160, D170, L110, L118, L120, L130, E170 Lawn Tractor Mower

What It Is

The GX20006 is a replacement transmission drive belt (1/2-inch wide, 89-inch length) designed to transfer power from the engine to the transmission on select John Deere lawn tractors. It keeps the mower moving forward/reverse, not the blades.

Fitment & Compatibility

Before buying, verify your mower’s model and deck size. This belt fits John Deere D110, D120, D125, D130, D140, D155, D160, D170, L110, L118, L120, L130, and E170 models—most with 42-inch or 48-inch decks. Check your owner’s manual or existing belt for the part number cross-reference (OEM equivalent is often John Deere GX20006 or M156040). Measure your old belt: it must be exactly 1/2" wide and 89" long. Aftermarket belts may vary slightly in material; confirm your mower’s pulley system uses a single, non-cogged belt.

Key Things to Do

• Check belt routing – Look for a diagram under the mower deck or in your manual. Misrouting can cause slipping or premature wear.
• Inspect pulleys – Worn or loose pulleys can damage a new belt. Replace any that wobble or have deep grooves.
• Installation difficulty – Moderate. You’ll need to loosen the deck or remove the belt guard; allow 30–45 minutes with basic hand tools.
• Quality note – At $8.88, this is a budget aftermarket belt. Expect shorter lifespan than OEM (likely 1–2 seasons vs. 3–4). Check for even tension after installation.

Should You Buy It

This is a solid choice if you want a low-cost quick fix for a worn transmission belt on a compatible John Deere lawn tractor, especially for light residential use. If you mow heavy grass or want maximum durability, consider spending more on an OEM belt. For occasional use, the price is hard to beat.