Yoursme AM136327 Right Hand Front or Left Hand Rear Mower Deck Gage Wheel Arm for John Deere Mower Decks X300 X500 Series 48 in and 54 in

What It Is

This is an aftermarket gage wheel arm that supports the outer edge of your mower deck, preventing scalping and uneven cuts. It’s designed for John Deere X300 and X500 series tractors with 48-inch or 54-inch decks, replacing the OEM part AM136327.

Fitment & Compatibility

• Deck size: Only fits 48-inch (48C, 48S) and 54-inch (54C, 54S) decks. Measure your deck width or check the model number stamped on the deck housing.
• Position: This arm is for the right-hand front or left-hand rear wheel position. Verify your broken arm’s location—left front and right rear use a different part (AM136328).
• OEM cross-reference: Direct replacement for John Deere part AM136327. Not compatible with X300/X500 models using 42-inch or 62-inch decks.
• Measurement check: The arm is about 6.5 inches long from pivot center to wheel bolt hole. Measure your old arm’s length to confirm match.
• Bolt pattern: Uses a 5/16-inch bolt for the wheel axle and a 3/8-inch bolt for the deck mount. Check that your existing hardware fits.

Key Things to Know

• Build quality: Made from stamped steel, not cast iron. It’s sturdy for residential use but may bend under heavy commercial mowing or hitting large rocks.
• Installation: Simple swap—remove one bolt from the deck bracket, slide out the old arm, insert the new one, and reattach. No special tools needed.
• Common gotcha: The included wheel may have a slightly different hub thickness than OEM. If the wheel wobbles, add a thin washer between the arm and wheel.
• Durability: Paint finish is decent but can chip quickly. Apply a coat of rust-resistant paint if you mow in wet grass or store outdoors.

Should You Buy It

If you need a budget-friendly replacement for a bent or broken gage wheel arm on your X300/X500 with a 48” or 54” deck, this is a solid pick. It’s not built for heavy abuse, but for standard residential mowing it saves you $10–15 versus the OEM part. Just double-check the position (right front or left rear) before ordering.