Caltric Transmission Belt Compatible with John Deere S100 S120 S130 S140 S160 S170 S180 S220 S240

What It Is

This is a replacement transmission drive belt for select John Deere S100-series lawn tractors. It transfers power from the engine to the transaxle, enabling forward/reverse movement. Designed as an aftermarket alternative to OEM John Deere part GY20767.

Fitment & Compatibility

Exact models: John Deere S100, S120, S130, S140, S160, S170, S180, S220, S240.
Key check: Measure your existing belt length—Caltric lists 1/2" x 92.5" (width x length). Verify your deck size (42" or 48") doesn’t change belt specs.
OEM cross-reference: Replaces John Deere GY20767, GY21133, and AM141780.
Not compatible: S100-series with different transmission (e.g., Tuff Torq K46 vs. K58). Confirm your model’s transaxle type before ordering.

Key Things to Know

• Quality: Most users report it fits and runs fine, but some note slightly thinner rubber than OEM. Expect 2-3 seasons of typical residential use.
• Installation: Moderate DIY job—requires removing mower deck and routing belt around pulleys and tensioner. Check your owner’s manual for routing diagram.
• Common gotcha: The belt may feel tight on first install. Do not force it; ensure tensioner is fully released. A loose fit after a few hours suggests incorrect routing.
• Warranty: Caltric offers a 30-day return window but no long-term warranty. Keep OEM belt as backup.

Should You Buy It

If you need a budget-friendly replacement for a residential John Deere S100-series and can handle basic installation, this belt works well. Skip it if you mow heavy commercial loads or want OEM-grade longevity—stick with John Deere GY20767 for $35–$45.