New Mower Deck Gauge Wheel Arm for John Deere AM120681

What It Is

This is a replacement gauge wheel arm for John Deere mower decks, specifically part number AM120681. It holds the gauge wheel that stabilizes the deck and prevents scalping on uneven terrain.

Fitment & Compatibility

• Deck sizes: Fits 42-inch, 48-inch, and 54-inch Edge, Edge X, and Autoconnect decks (check your deck model—listed on a sticker under the deck).
• OEM vs aftermarket: This is a non-OEM part, but direct replacement for John Deere AM120681. Verify your deck uses a single-arm (not dual-arm) gauge wheel assembly.
• Measurements: Arm length is approximately 8 inches from pivot center to wheel axle hole. Bolt hole diameter is 0.5 inches. Wheel spindle diameter is 0.75 inches.
• Check before buying: Measure your existing arm length and bolt spacing. Confirm your deck uses a single bolt to attach the arm (not a bracket system). If your deck has a different mounting pattern, this arm won’t fit.

Key Things to Know

• Quality: Aftermarket steel construction is slightly thinner than OEM—fine for residential use but may bend under heavy commercial mowing.
• Installation: Simple bolt-on replacement—remove the old arm, slide the new one into the bracket, and tighten the bolt to 30-35 ft-lbs. No modification needed.
• Gotcha: The included bushing may be loose on some deck brackets—wrap with electrical tape if sloppy. Also, the arm can rust quickly if paint chips; a coat of spray paint extends life.
• Wheel not included: This is just the arm—you’ll need a gauge wheel (typically 8-inch) separately.

Should You Buy It

Yes, if you have a compatible John Deere deck and need a quick, affordable fix for a bent or broken gauge wheel arm. It’s ideal for residential mowing and occasional use. Skip it if you’re a commercial operator—go OEM for thicker steel and longer life.