42 inch Deck Rebuild Kit for John Deere D110 D120 D130 LA105-2xSpindles for GY21098 + 1xIdler for GY20067 + 1xIdler for GY20629 + 2xPulleys for GX20367 + 2xBlades for GY20850 + 1x Belt for GX20072

What It Is

This 42-inch deck rebuild kit provides all the major wear components for a complete refurbishment of the cutting deck on select John Deere lawn tractors. It’s designed for models D110, D120, D130, and LA105, replacing worn spindles, idlers, pulleys, blades, and the drive belt in one package.

Fitment & Compatibility

Before buying, confirm your mower deck is 42 inches and that your model is one of the following: John Deere D110, D120, D130, or LA105 (with a 42-inch deck). The kit includes:

• 2x Spindles (replaces OEM GY21098)
• 1x Idler pulley (replaces GY20067)
• 1x Idler pulley (replaces GY20629)
• 2x Pulleys (replaces GX20367)
• 2x Blades (replaces GY20850)
• 1x Belt (replaces GX20072)

Measure your deck width and verify your existing part numbers match the OEM replacements listed. This is an aftermarket kit, so check that your deck uses the same spindle bolt pattern and pulley diameters. If your blades are listed as GY20850, you’re good. Not compatible with 48-inch or other deck sizes.

Key Things to Know

• Quality: Aftermarket parts at a budget price. With a perfect 5.0 rating (4 reviews), early buyers report good fit and finish, but long-term durability vs. OEM is unproven.
• Installation difficulty: Moderate. You’ll need basic socket wrenches, a torque wrench (spindle bolts typically 30-40 ft-lbs), and a belt removal tool. Expect 1–2 hours for a first-timer.
• Common gotchas: The belt tensioner must be released before removing the old belt—don’t force it. Spindle bearings may need grease before installation (check included instructions). Verify all pulley spacers and washers are reused from your original deck.
• No hardware: The kit includes parts only; you’ll need to reuse your existing bolts, nuts, and spacers.

Should You Buy It

If your 42-inch John Deere D110, D120, D130, or LA105 deck is showing worn spindles, noisy idlers, or a slipping belt, this all-in-one kit saves time and money versus buying each part separately. It’s a solid choice for DIY owners who want a full refresh in one order and are comfortable with moderate mechanical work. For heavy commercial use or if you need OEM reliability, stick with genuine John Deere parts.