Lawn Tractor Transmission Drive Belt 1/2"x88 1/2" Replace GX20006 for John Deere L120 D130 155C L110 L118 42" 48" Deck for John Deere X100 X110 X120 X125 X140 X145 X165

What It Is

This is a 1/2-inch wide by 88.5-inch long lawn tractor transmission drive belt, designed to transfer power from the engine to the transmission on select John Deere lawn tractors. It replaces OEM part GX20006 and is commonly used on 42" and 48" deck models for cutting and general yard work.

Fitment & Compatibility

Before buying, confirm your tractor model and deck size. This belt fits John Deere L-series (L120, D130, 155C, L110, L118) and X100/X100-series (X100, X110, X120, X125, X140, X145, X165). It is not for zero-turn mowers or older 100-series models. Measure your old belt length and width: must be exactly 1/2" wide and 88.5" long. Check that your tractor uses a GX20006 OEM belt (verify in your owner’s manual or online parts lookup). This is an aftermarket belt, so it may differ slightly from OEM in material or stiffness.

Key Things to Know

• Quality: Aftermarket belt; 4.5 rating from 14 reviews suggests good value, but some users report shorter lifespan than OEM for heavy-duty use.
• Installation: Moderate difficulty. You’ll need to remove the mower deck and possibly the belt guard. Use a belt routing diagram (often under the hood or in the manual) to avoid twisting.
• Common gotchas: Belt length must be exact—too short or too long will cause slipping or damage. Check pulleys for wear or debris before installing. If your tractor has a 54" deck, this belt won’t fit.
• Price vs. OEM: At $12.99, it’s a fraction of the OEM cost (often $30+). Good for budget replacements on older or light-use machines.

Should You Buy It

If you need a quick, affordable replacement for a John Deere L or X100-series tractor with a 42" or 48" deck, and you’re comfortable with moderate DIY installation, this belt is a solid choice. It’s not ideal for heavy commercial use or if you prefer OEM longevity, but for home owners with light-to-medium mowing, it offers good value at a low price.