AM131288 Mower Deck RH Gauge Wheel Arm Shaft Replacement Part Fit for John Deere Mower Lawn & Garden Tractors GX345 GX355 4010 4210 GT225 GT235 X465 X575

What It Is

The AM131288 is a replacement right-hand gauge wheel arm shaft for John Deere lawn and garden tractors. It supports the deck’s gauge wheel, helping maintain consistent cutting height and preventing scalping on uneven terrain.

Fitment & Compatibility

• Compatible models (verified): GX345, GX355, 4010, 4210, GT225, GT235, X465, X575. Also fits select X300/X500 series with 48" or 54" decks (check your deck model number).
• OEM cross-reference: Replaces John Deere part AM131288 (genuine OEM). Aftermarket version should match OEM dimensions exactly.
• Measure before buying: Overall shaft length is ~7.5 inches; bushing diameter ~0.75 inches. Verify your existing shaft length and bushing fit. If your deck uses a different arm design (e.g., left-hand or center-mounted), this will not fit.
• Not universal: Will not fit older 300/400 series or compact utility tractors (e.g., 455, 445). Always confirm deck model and year on your tractor’s serial plate.

Key Things to Know

• Installation difficulty: Easy (30–60 minutes). Requires basic hand tools: socket set, penetrating oil, and possibly a pry bar if rusted.
• Check bushing condition: The shaft rides in a plastic or metal bushing. If the bushing is worn, replace it simultaneously (John Deere part AM107522 or AM137310). A worn bushing will cause the new shaft to wobble and wear prematurely.
• Watch for rust: Shafts on older decks often seize. Spray penetrating oil on the retaining clip and shaft end before removal. If stuck, use a hammer and punch gently.
• Quality note: Aftermarket versions (like this one) are typically zinc-plated steel and match OEM durability. Inspect for rough edges or burrs before installing; file if needed.

Should You Buy It

If your John Deere lawn tractor (GX345, GT235, X465, etc.) has a wobbly or broken right gauge wheel arm, this replacement is a solid, cost-effective fix. It’s easy to install, fits perfectly on listed models, and restores deck stability. Avoid if your deck uses a different arm design or if the bushing is also worn—you’ll need to replace both for a lasting repair.