AM131289 Mower Deck Gauge Wheel Arm Left Front & Right Rear Replacement Part Fit For Most Compact Utility Tractor & Lawn & Garden Tractors GX345 GX355 GX325 2210 4010 GT225 GT235 X465 X485 X585

What It Is

This replacement gauge wheel arm (AM131289) supports the left front and right rear corners of a mower deck, preventing scalping and providing a consistent cut height on uneven terrain. It’s designed for compact utility tractors and lawn/garden tractors, including popular John Deere models.

Fitment & Compatibility

Before buying, confirm your deck’s spindle-to-spindle width—this arm fits 48-inch and 54-inch decks used on GX345, GX355, GX325, 2210, 4010, GT225, GT235, X465, X485, and X585 tractors. It’s an aftermarket replacement for OEM part AM131289. Measure the existing arm’s length (center-to-center of mounting holes) and bracket spacing—this arm uses a 5/8-inch diameter pin. Verify your deck’s mounting bracket orientation; this arm is specific to left front and right rear positions (not interchangeable with right front/left rear). Check that your wheel spindle and bearing assembly are compatible—this arm does not include the wheel or tire.

Key Things to Know

• Quality variance: Some users report thinner metal than OEM, which may bend under heavy use on rough terrain. Inspect for burrs or misaligned holes before installing.
• Installation difficulty: Moderate—requires removing the old arm, possibly unbolting the deck bracket. Use penetrating oil on rusted fasteners. A jack or deck lift helps.
• Common gotcha: The pin hole may need slight filing if tight. Ensure the arm pivots freely after mounting to avoid binding.
• No hardware included: You reuse your existing pin, washer, and cotter pin. Have replacements on hand if worn.

Should You Buy It

If you need a budget-friendly replacement for a bent or worn OEM arm on a compatible John Deere tractor, this will restore deck height adjustment and reduce scalping. It’s best for flat to mildly uneven lawns—for heavy commercial use or rocky terrain, consider OEM for better durability.