Parts Camp Mower Deck Spindle Assembly Replaces John Deere AM144377 AM124498 AM131680 - Fits LX280 LX289 GX325 GX335 LT180 LT190 X300 X320 Mowers - 5.5" Height, 5" Pulley OD with Grease Zerk

What It Is

This is a replacement mower deck spindle assembly that drives the cutting blade. Designed for select John Deere lawn tractors with 48-inch or 54-inch decks, it restores blade rotation when the original spindle fails due to worn bearings or shaft damage.

Fitment & Compatibility

Before buying, verify your mower model and deck size. This spindle fits John Deere LX280, LX289, GX325, GX335, LT180, LT190, X300, and X320 models—but only those with 48-inch or 54-inch decks (not 42-inch). Measure your old spindle: height must be 5.5 inches (from mounting flange bottom to shaft tip), pulley outer diameter must be 5 inches. It replaces OEM part numbers AM144377, AM124498, and AM131680. If your spindle has a different height or pulley size, this won’t fit. Check that your deck uses a standard 5/8-inch shaft and a 3/8-inch bolt hole pattern (common on these models).

Key Things to Know

• Quality vs OEM: Aftermarket spindle with a grease zerk for periodic lubrication—adds maintenance but may extend life. Some users report shorter bearing lifespan than OEM John Deere parts (around 2-3 seasons vs 5+).
• Installation difficulty: Moderate. You’ll need a jack, socket set, and possibly a puller to remove the old spindle. Expect 1-2 hours. The pulley is pre-installed, saving assembly time.
• Common gotcha: The grease zerk sits on top—make sure you have clearance under the deck to access it. Over-greasing can blow seals; use a hand grease gun with light strokes.
• Measurement mismatch: Double-check pulley OD (5 inches) and spindle height (5.5 inches) against your old part. A 0.1-inch difference can cause belt alignment issues.

Should You Buy It

Right for budget-conscious owners of the listed John Deere models who don’t mind greasing the spindle annually and accept a shorter service life than OEM. Skip it if you want a long-term, no-maintenance fix—buy the genuine John Deere part instead.