42 Inch Deck Rebuild Kit Fits John Deere LA100 LA105 LA110 LA115 LA120 LA125 LA135 D100 D105 D110 D130 Mower Parts 2 GY21098 AUC15811 Spindle 2 AM137328 Blade 4 Idler Pulley GY20629 GY20067 GX20367

What It Is

This is a comprehensive deck rebuild kit for 42-inch cutting decks on select John Deere lawn tractors. It includes two spindle assemblies (GY21098/AUC15811), four idler pulleys (GY20629, GY20067, GX20367), and two blade assemblies (AM137328) – everything needed to refresh a worn-out deck in one purchase.

Fitment & Compatibility

Check your deck size first: This kit is designed for 42-inch stamped steel decks only. It fits John Deere LA100, LA105, LA110, LA115, LA120, LA125, LA135, D100, D105, D110, and D130 models.

OEM cross-reference: The spindles replace John Deere GY21098 and AUC15811; blades replace AM137328; pulleys replace GY20629, GY20067, and GX20367.

Verify deck type: Some LA/D-series tractors came with 42-inch Edge or 48-inch decks – this kit will not fit those. Measure your deck width from blade tip to blade tip (full 42 inches) and confirm the spindle bolt pattern (typically 3-bolt).

Aftermarket note: This is not OEM John Deere. It’s a third-party rebuild kit, so expect standard-grade steel rather than factory-hardened components. Check that your existing pulley belt matches the included pulley diameters (measure belt length if possible).

Key Things to Know

• Installation difficulty: Moderate – requires basic socket set, torque wrench, and a jack to access deck underside. Spindle replacement involves removing the blade, pulley, and housing bolts; idler pulleys are straightforward with a wrench.
• Common gotcha: The spindle bearings are pre-greased and sealed – no grease fittings, so you can’t service them. If you run over debris, they can fail faster than OEM.
• Quality note: The blades are standard-grade steel (not hardened). They work fine for residential grass but dull faster on rocky or sandy soil.
• Belt compatibility: The kit does not include a deck belt. You’ll need to buy a separate 42-inch deck belt (e.g., John Deere GX20072 or AM141326) if yours is worn.

Should You Buy It

This kit is ideal if your 42-inch John Deere LA or D-series deck has noisy spindles, wobbling blades, or seized idler pulleys – and you want a single, affordable solution to avoid multiple parts orders. It’s a good value for residential users who don’t need OEM longevity, but commercial operators or owners of high-hour machines should consider genuine John Deere spindles for better durability.