ERGIT GX20006 Transmission Drive Belt Replacement for John Deere D110 D120 D125 D130 D140 D150 D155 D160 D170 L105 L108 L110 L111 L118 L120 L130 Riding Mower/Tractors

What It Is

This is a replacement transmission drive belt for select John Deere riding mowers and lawn tractors. It transfers power from the engine to the transmission, enabling forward and reverse movement. Designed for models with hydrostatic or manual transmissions in the D100, L100, and L100-series.

Fitment & Compatibility

Before buying, verify your mower’s model number (e.g., D110, L120) and deck size – this belt fits 42-inch, 48-inch, and 54-inch decks on the listed models, but not all deck sizes on every model. Check your OEM belt part number: this replaces John Deere GX20006, GX20007, GY20789, and GY20790. Measure your old belt length (roughly 94.5 inches) and width (0.5 inches). It is not compatible with zero-turn mowers or older models not listed. If your mower uses a different belt routing or tensioner style, confirm the diagram matches your setup.

Key Things to Know

• Quality vs OEM: ERGIT is an aftermarket belt. Users report it matches OEM specs but may wear slightly faster under heavy use. Inspect for fraying after 50 hours.
• Installation difficulty: Moderate. You’ll need to remove the mower deck and possibly the belt guard. A belt routing diagram is included, but double-check your service manual.
• Common gotchas: The belt may be tight on the first install – use a wrench to relieve tension on the idler pulley. Do not use lubricant on the belt; it can slip. If your mower has a worn pulley, replace it first to avoid premature belt wear.
• Return policy: If it doesn’t fit, measure your old belt length and compare. Amazon returns are easy, but verify compatibility before opening.

Should You Buy It

Buy this if you need a budget-friendly, direct replacement for a worn GX20006 belt on a compatible John Deere lawn tractor and are comfortable with basic mechanical work. It’s a solid value for occasional home use, but if you mow commercially or want maximum longevity, consider an OEM belt.