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

What It Is

This is the right-hand (RH) gauge wheel arm shaft for the mower deck on select John Deere lawn and garden tractors. It supports the gauge wheel that helps prevent scalping and stabilizes the deck during mowing.

Fitment & Compatibility

Before buying, confirm your tractor model and deck size. This AM131288 replacement fits John Deere models GX345, GX355, 4010, 4210, GT225, GT235, X465, and X575. It is an aftermarket part, not OEM, so expect slight finish differences. Measure your existing shaft length (approx. 7.5 inches) and diameter (5/8 inch) to verify. Also check that your deck uses a pin-style attachment—some older decks use a bolt-on design.

Key Things to Know

• Quality: Aftermarket steel construction is durable but may have a looser fit than OEM. Grease the shaft before installation to reduce wear.
• Installation: Simple bolt-on job—remove the retainer clip, slide out the old shaft, and slide in the new one. No special tools needed.
• Common Gotcha: The retaining clip can be stubborn on rusted decks. Use penetrating oil and a small pry bar to avoid breaking the clip.
• Deck Compatibility: This shaft is for 48-inch and 54-inch decks on the listed models. Double-check your deck’s mounting bracket width—narrower brackets may require a different part.

Should You Buy It

If you need a direct-fit, affordable replacement for a worn or bent RH gauge wheel arm shaft on one of the listed John Deere tractors, this is a solid choice. It’s a simple fix that restores deck stability and prevents scalping. Skip it if you prefer OEM parts for exact tolerances or if your deck uses a different attachment style.