Steering Sector Gear AM136297 for John Deere X300 X320 X340 X500 X520 Replacement for AM136297 M151206

What It Is

The Steering Sector Gear AM136297 is a replacement gear that connects the steering wheel to the mower’s front wheels, enabling turning. It’s designed for John Deere X300, X320, X340, X500, and X520 lawn tractors, typically used for residential lawn care.

Fitment & Compatibility

• Models: Fits John Deere X300, X320, X340, X500, X520 series. Does not fit X350, X370, or X580 without modification.
• OEM vs Aftermarket: This is a direct replacement for OEM part numbers AM136297 and M151206. Aftermarket version is identical in fit but may have slightly different tooth finish.
• Measurements: Gear has 10 teeth, shaft diameter 0.5 inches, overall length 2.25 inches. Verify your old gear matches these specs.
• Check Before Buying: Remove the old gear and count teeth. Measure shaft diameter with calipers. Ensure your mower’s steering sector housing is not cracked or worn—if it is, replace the housing too.

Key Things to Know

• Quality: 4.6/5 rating from 82 reviews; users report it’s durable for 2-3 seasons of regular mowing. Some note minor burrs on teeth—file them smooth before install.
• Installation Difficulty: Moderate (30-60 minutes). You’ll need a socket set, pry bar, and penetrating oil for rusted bolts. No special tools required.
• Common Gotchas: The gear can be tight to seat—apply grease to the shaft and teeth. Torque the retaining bolt to 15-20 ft-lbs; overtightening cracks the housing. If steering still feels loose after install, check tie rod ends.
• Wear Signs: If steering has excessive play, the gear teeth are likely worn. This part fixes that, not sloppy wheel bearings.

Should You Buy It

Buy it if your X300–X520 has sloppy steering or the gear teeth are visibly worn. It’s a solid, budget-friendly fix for a common issue. Avoid if your steering housing is cracked or if you need a complete steering kit (includes bearings and bushings).