42 inch Deck Rebuild Kit for John Deere D105 D110 D120 LA100 LA105 LA130 S140, 2 Spindle for GY21098 AUC15811, 2 Blade GY20850, 2 Pulley GX20367, 2 Idler GY20067/GY22082, 1 Be lt GX20072

What It Is

This 42-inch deck rebuild kit includes two spindles, two blades, two pulleys, two idler pulleys, and one drive belt—everything needed to replace worn-out cutting components on a single 42-inch mower deck. It’s designed for John Deere lawn tractors with a 42-inch stamped-steel deck, typically models from the D100 and LA100 series.

Fitment & Compatibility

Before buying, confirm your mower has a 42-inch deck (measure blade tip to tip). This kit fits John Deere D105, D110, D120, LA100, LA105, LA130, and S140. Cross-reference your deck’s OEM part numbers: spindles replace GY21098 or AUC15811, blades replace GY20850, pulleys replace GX20367, idlers replace GY20067 or GY22082, and the belt replaces GX20072. If your deck uses a different spindle or blade design (e.g., 48-inch or 54-inch decks), this kit won’t work. Always verify your mower’s model number and deck serial tag before ordering.

Key Things to Know

• Quality vs OEM: These are aftermarket parts—generally fine for residential use, but spindles and blades may wear faster than John Deere OEM. Check reviews for durability complaints.
• Installation difficulty: Moderate. Requires basic tools (socket set, jack, possibly a puller for old pulleys). Budget 1–2 hours if you’ve done deck work before; longer if first time.
• Common gotchas: The idler pulleys may have different bolt patterns than your original—measure center-to-center hole spacing before installing. Also, the belt may be slightly tighter or looser than OEM; adjust deck tension accordingly.
• Blade orientation: Blades are universal for 42-inch decks but must be installed with the cutting edge facing upward. Torque spindle bolts to 40–50 ft-lbs.

Should You Buy It

If you have a 42-inch John Deere from the D100 or LA100 series and need a full refresh without paying OEM prices, this kit delivers decent value for the cost. It’s best for DIY homeowners who want one-and-done replacement and don’t mind aftermarket longevity. Skip it if you need exact OEM fit, commercial-grade durability, or have a different deck size.