2 Pack GY20785 Spindle Assembly with GX20367 Pulley GY20629 GY20067 Idler Pulley GX20072 Belt Replaces GY20050 for John Deere L110, L111, L118, L105, L107, L108, L100 Lawn Tracors

What It Is

This is a 2-pack of replacement spindle assemblies (GY20785) that includes two GX20367 pulleys, plus a GY20629/GY20067 idler pulley and a GX20072 belt. It’s designed for the 42-inch cutting decks on select John Deere 100-series lawn tractors, specifically models L100, L105, L107, L108, L110, L111, and L118. The kit covers the main rotating spindles that drive the blades and the idler pulley that maintains belt tension.

Fitment & Compatibility

Before buying, verify your tractor’s model number (stamped on the frame near the left front tire or under the seat). This kit fits only 42-inch decks on the listed models—not 38-inch or 48-inch decks. OEM part numbers replaced include GY20050, GY20585, GY20785, GX20367, GY20629, GY20067, and GX20072. Measure the existing spindle shaft diameter (should be 5/8-inch) and check that your deck uses two spindles (some earlier models used a single). The included belt is for the blade drive, not the deck lift belt. If your tractor uses a different idler pulley design (e.g., stamped steel vs. cast iron), confirm the GY20629 matches your bracket.

Key Things to Know

• Quality note: Aftermarket spindles in this price range often use sealed bearings instead of greasable ones. They’re fine for residential use but may not last as long as OEM under heavy or frequent mowing.
• Installation difficulty: Moderate. You’ll need a socket set, a jack or blocks to raise the deck, and a puller for stubborn pulleys. The belt routing is straightforward but double-check the diagram—incorrect tension leads to premature wear.
• Common gotcha: The idler pulley (GY20629) may have a slightly different offset than the original. Test fit before reassembling the deck. If the belt rides too high or low, you may need a spacer.
• Pack contents: Two spindle assemblies, two pulleys, one idler pulley, one belt. No hardware (bolts, lock washers) included—reuse yours or buy new.

Should You Buy It

If you have a 42-inch deck on a John Deere 100-series tractor and your spindles are wobbling, noisy, or seized, this kit is a cost-effective fix for residential mowing. It’s not built for commercial use or heavy-duty abuse, but for a homeowner replacing worn parts, the price and included belt make it a solid value.