2 Pack Deck Spindle Set for John Deere GY20785 GT20050 42" 48" Mower Decks on L100 L107 L108 L110 L111 L118 L120 L130

What It Is

This is a 2-pack of replacement deck spindles designed for John Deere 42-inch and 48-inch mower decks used on select L100-series lawn tractors. Each spindle holds the blade and allows it to spin freely; you need one per blade, and this set covers two spindles (typically for a 2-blade deck).

Fitment & Compatibility

Check these before buying:

• Deck size: Fits 42-inch (GY20785) and 48-inch (GT20050) decks only. Not for 54-inch or other sizes.
• Model numbers: L100, L107, L108, L110, L111, L118, L120, L130. Also fits some LA-series and D-series tractors with the same deck.
• OEM cross-reference: Replaces John Deere part numbers GY20785 and GT20050. Aftermarket, not OEM.
• Physical check: Measure your spindle’s bolt pattern (typically 3-bolt, 2.5-inch center hole) and shaft diameter (5/8-inch). Confirm your deck uses the same pulley and blade mount style.

Key Things to Know

• Installation difficulty: Moderate. Requires removing the deck, pulley, and blade. You’ll need a socket set, a puller for the pulley (if stuck), and a torque wrench for blade bolts (45-55 ft-lbs).
• Quality: Aftermarket, but rated 4.6/5. Users report good durability for residential use. Not heavy-duty enough for commercial mowing.
• Common gotcha: The bearings are sealed and pre-lubricated—do not add grease. Check that the spindle housing is compatible with your deck’s mounting holes; some aftermarket spindles may need minor shimming.
• Pack contents: Two spindles with bearings installed. No pulleys, blades, or hardware included.

Should You Buy It

This set is a solid value for DIY homeowners replacing worn spindles on a 42- or 48-inch John Deere L-series deck. It’s cheaper than OEM and works well for residential cutting, but skip it if you need commercial-grade durability or have a different deck size.