AM137483 Mower Blade Spindle Assembly Compatible with John Deere X300 X300R X304 X305R X310 X324 X350 X350R X354 X370 Z235 Z245 Z255 Z355E Housing

What It Is

The AM137483 mower blade spindle assembly is the rotating hub that holds the blade and transfers power from the belt to cut grass. It’s designed for select John Deere X300-series garden tractors and Z200/Z300-series zero-turn mowers, primarily for 42-inch and 48-inch decks.

Fitment & Compatibility

Before buying, confirm your mower model and deck size. This assembly fits John Deere X300, X300R, X304, X305R, X310, X324, X350, X350R, X354, X370, Z235, Z245, Z255, and Z355E. It’s for 42-inch and 48-inch decks only—not 54-inch. Measure the spindle bolt pattern (typically 3-bolt, 2.5-inch spacing) and compare to your old one. The AM137483 is an aftermarket replacement for OEM part AM137483, so it should match dimensions and bearing type. Check that your deck uses a stamped housing (not fabricated) to avoid fit issues.

Key Things to Know

• Quality: Aftermarket spindle with sealed bearings. Most users report it holds up well for residential use, but it may not last as long as OEM under heavy commercial abuse.
• Installation: Moderate difficulty. You’ll need a socket set, torque wrench, and possibly a puller to remove the old spindle. Expect 30–60 minutes per spindle.
• Common Gotchas: The spindle shaft may have a slightly different thread length than OEM—check that your blade bolt and washer fit before tightening. Also, verify the belt pulley diameter matches your deck (usually 4.5 inches).
• Lubrication: No grease fittings; it’s pre-sealed. Replace the whole assembly when bearings wear out—don’t try to rebuild it.

Should You Buy It

If you own one of the listed John Deere models with a 42-inch or 48-inch deck and need a budget-friendly replacement for a worn or noisy spindle, this is a solid choice. It’s not for heavy commercial use, but for residential mowing, the price and rating make it a practical alternative to OEM parts. Just double-check your deck type and bolt pattern before ordering.