AM136328 AM136327 Mower Deck Gage Wheel Arm Shaft Front Left & Right with 3/4" Diameter for John Deere Tractors X300 X320 X324 X340 X360 X500 X520 X530 X534 X540 with 48 inch and 54 inch Mower Deck

What It Is

This is a replacement gauge wheel arm shaft set (left and right) for John Deere X300–X540 series tractors with 48-inch or 54-inch mower decks. It supports the front deck wheels, preventing scalping and stabilizing cut height on uneven terrain.

Fitment & Compatibility

• Check your deck size: This set fits only 48-inch (48C/48S) and 54-inch (54C/54S) mower decks. It will not work on 42-inch or 60-inch decks.
• Confirm your model: Compatible with John Deere X300, X320, X324, X340, X360, X500, X520, X530, X534, and X540.
• Shaft diameter: Both arms use a 3/4-inch diameter shaft. Measure your existing shaft to confirm—older or non-standard decks may differ.
• OEM vs aftermarket: This is an aftermarket part (branded AM136328/AM136327). It is a direct replacement for OEM John Deere parts AM136328 (left) and AM136327 (right). No modifications needed.
• What to measure: Arm length (center of shaft hole to end) and bolt hole spacing. For 48-inch decks, arms are typically shorter; for 54-inch, longer. Verify against your old part.

Key Things to Know

• Installation difficulty: Moderate. Requires removing the deck, unbolting the old arms, and transferring the gauge wheels. Basic hand tools (socket set, wrench) are sufficient.
• Common gotcha: The left and right arms are not interchangeable. Left (AM136328) and right (AM136327) are mirror images. Double-check orientation before bolting.
• Quality note: Aftermarket steel is generally durable, but some users report slightly looser fit on the shaft bushing compared to OEM. Apply anti-seize to prevent binding.
• Wheel not included: This is just the arm shaft assembly—you reuse your existing gauge wheels and hardware.

Should You Buy It

If your John Deere X300–X540 with a 48-inch or 54-inch deck has bent or worn gauge wheel arms, this is a cost-effective direct replacement. It’s not for other decks or models, and you’ll need basic mechanical skills to install. Good value for restoring level cut height and preventing scalping.