8TEN Deck Spindle for John Deere X300 Z225 X304 X324 X310 X300R AM136733 AM143469 AM134292 2 Pack

What It Is

This is a 2-pack of replacement deck spindles for select John Deere lawn tractors and zero-turn mowers (X300, X324, X310, X300R, Z225, and others). The spindle assembly drives the mower blade from the belt pulley; if your deck vibrates, wobbles, or won’t cut evenly, a worn spindle is the likely cause.

Fitment & Compatibility

Before buying, confirm your mower’s model and deck size. These spindles fit John Deere 42-inch and 48-inch Edge, Edge X, and standard decks on the listed models. They replace OEM part numbers AM136733, AM143469, and AM134292. Measure your spindle housing bolt pattern (should be 3.25 inches center-to-center) and shaft diameter (5/8 inch). They will not fit 54-inch decks or older 300-series tractors with different spindle geometry. Also verify your deck has grease fittings—these spindles are pre-greased and sealed, so no Zerk fittings are included.

Key Things to Know

• Quality vs OEM: These are aftermarket, not genuine John Deere. Most users report they last 1-2 seasons under normal use; OEM spindles may last longer but cost 2-3x more.
• Installation difficulty: Moderate. You’ll need a socket set, a wrench for the pulley nut (likely 15/16-inch), and a puller if the old spindle is seized. Expect 30-60 minutes per spindle.
• Common gotchas: The pulley nut may be reverse-threaded on some decks—check yours before forcing. Also, the spindle housing may not include the mounting bolts; reuse your originals or buy grade 8 bolts separately.
• Warranty: 8TEN offers a limited 1-year warranty, but returns require the original packaging.

Should You Buy It

If you have one of the listed John Deere models with a 42- or 48-inch deck and want a budget-friendly fix for a wobbling or noisy spindle, this 2-pack is a solid value. It’s not built for commercial use, but for a homeowner cutting a typical yard, it’s a reliable replacement that saves $40–$60 vs. buying two OEM spindles.