8TEN Deck Spindle for John Deere L120 L130 L100 L110 L105 L107 L108 GY20785 GT20050

What It Is

This is an aftermarket replacement deck spindle assembly for select John Deere 100-series lawn tractors (L100, L110, L105, L107, L108, L120, L130). It drives the mower blade and houses the bearing that allows the blade to spin freely.

Fitment & Compatibility

Before buying, confirm your mower model and deck size. This spindle fits 42-inch and 48-inch decks on the models listed. Cross-reference with OEM part numbers GY20785 or GT20050. Measure the spindle height and shaft diameter (typically 1 inch) to match your existing unit. If your deck uses a different spindle housing or bolt pattern, this will not fit. Check that the pulley is the correct diameter for your belt—some aftermarket spindles use a slightly smaller pulley, which can affect blade speed.

Key Things to Know

• Quality vs OEM: This is a budget-friendly aftermarket part. Some users report shorter bearing life compared to OEM John Deere spindles, especially under heavy use or in dusty conditions.
• Installation difficulty: Moderate. You’ll need a socket set, a pulley puller (if reusing the old pulley), and possibly a torque wrench. Expect 30–60 minutes per spindle.
• Common gotcha: The included hardware may not match your deck’s bolts exactly. It’s smart to reuse your original bolts or buy Grade 8 replacements.
• No grease fitting: Most aftermarket spindles in this price range are sealed and non-serviceable. Once the bearing fails, you replace the whole spindle.

Should You Buy It

If you need a quick, low-cost fix for a spindle that’s worn out on a 100-series John Deere, this is a solid choice. It’s not built for commercial use or heavy-duty mowing, but for a homeowner with a single tractor, it’s a good value that will get you through several seasons. If you want maximum longevity or run a large property, spend more on an OEM spindle.