42 Inch Mower Deck Rebuild Kit Fits John Deere 102 105 115 LA100 D120 Lawn Mower Includes 2 Spindle GY20867 AUC15811 2 Blade AM141033 4 Pulley GY20110 GY20067 GX20367 1 Belt GX20072 Review

Overview

The 42-Inch Mower Deck Rebuild Kit for John Deere 102, 105, 115, LA100, and D120 lawn tractors is a comprehensive restoration package designed to breathe new life into aging or worn-out mower decks. Priced at $125.99, this kit targets DIY homeowners who want to avoid a costly new deck or dealer service, offering everything needed to replace spindles, blades, pulleys, and the drive belt in one go. It’s a practical, cost-effective solution for those with mid-size John Deere lawn tractors who value a smooth, even cut without the hassle of sourcing parts individually.

Who Should Buy This

1. John Deere owners with decks over 5 years old – If your 102, 105, 115, LA100, or D120 is starting to vibrate, cut unevenly, or leave uncut strips, this kit addresses the most common failure points: worn spindles, dull blades, and glazed pulleys. It’s a perfect mid-life refresh.

2. DIY homeowners who hate downtime – Instead of chasing parts across multiple stores or waiting for separate shipments, this kit bundles every essential component. You can knock out the entire rebuild in a weekend, getting back to mowing without multiple trips to the hardware store.

3. Budget-conscious owners avoiding dealer repairs – A dealer spindle replacement alone can cost $100–$150 in labor. This kit gives you all the parts for less than a single service visit, assuming you’re comfortable with basic tools (wrenches, sockets, and a jack).

4. Owners of 1/2 to 1-acre lawns – These John Deere models are ideal for medium-sized properties. If your deck has seen 100+ hours of mowing, the bearings in the spindles are likely shot, and the pulleys may have developed grooves. This kit restores cutting performance to like-new condition.

Key Features Breakdown

• 2 Spindle Assemblies (GY20867 / AUC15811) – These are the heart of the rebuild. Worn spindles cause blade wobble, vibration, and uneven cutting. The kit includes sealed bearings pre-installed in the housings, saving you the hassle of pressing old bearings out. Direct fit for the 42-inch Edge and standard decks on these models.

• 2 Blades (AM141033) – High-carbon steel blades that match OEM specs. They’re 18.5 inches long with a 1-inch center hole and a 0.25-inch offset. Sharp out of the box, but you’ll want to balance them after installation for best results. These are standard lift blades—good for bagging and side discharge, but not mulching.

• 4 Pulleys (GY20110, GY20067, GX20367) – Includes the two outer spindle pulleys (GY20110), one center spindle pulley (GY20067), and one tensioner pulley (GX20367). Over time, pulleys develop grooves from belt wear, causing belt slip and squealing. Replacing them ensures the belt tracks properly and reduces strain on the engine.

• 1 Belt (GX20072) – A 42-inch Kevlar-reinforced V-belt. This is the drive belt that connects the engine pulley to the deck. It’s a common wear item that stretches or cracks after a few seasons. Including it in the kit means you replace everything in one shot, preventing premature failure of the new spindles from an old belt.

• Complete Deck Rebuild – The kit covers all wear items on the deck except for the deck shell itself, mandrel housings (if cracked), and hardware (nuts/bolts). It’s designed for a full refresh, not a partial fix.

Pros

1. Everything in one box – No need to cross-reference part numbers or make multiple orders. The kit includes spindles, blades, pulleys, and belt—all matched to your tractor model.

2. Cost-effective – At $125.99, it’s roughly half the price of buying these parts separately from a dealer. You save significant money compared to a shop rebuild.

3. Restores cutting quality – New spindles eliminate vibration and noise, while sharp blades and fresh pulleys give a clean, even cut. Most users report a dramatic improvement in grass appearance.

4. Direct fit for common John Deere models – Works with the 42-inch deck on 102, 105, 115, LA100, D120, and several others (check your deck model number). No modification needed.

5. Includes tensioner pulley – Many rebuild kits skip the tensioner, but this one includes it. A worn tensioner can cause belt chirping and premature wear, so this is a smart inclusion.

6. Solid build quality – The spindles use sealed bearings that are pre-greased, and the blades are thick enough to handle occasional rocks without bending. Not commercial-grade, but durable for residential use.

Cons

1. Not for all John Deere 42-inch decks – This kit fits only the Edge or standard 42-inch decks on these specific models. If you have a different deck design (e.g., a stamped deck on an older tractor), check compatibility carefully. The spindle bolt pattern varies.

2. Blades are standard lift, not mulching – If you prefer a mulching setup, you’ll need to buy aftermarket mulching blades separately. The included blades work well for bagging and side discharge but won’t chop clippings as fine.

3. Hardware not included – You’ll need to reuse your existing spindle bolts, pulley nuts, and blade bolts. If those are rusted or stripped, you’ll need to source them separately. It’s a minor annoyance.

4. No installation instructions – The kit assumes you’re mechanically inclined or can find a YouTube video. For a first-timer, this can be intimidating. You’ll need to know how to remove the deck, access spindles, and tension the belt.

Bottom Line

The 42-Inch Mower Deck Rebuild Kit is a no-brainer for John Deere owners with worn decks on 102, 105, 115, LA100, or D120 tractors. It delivers professional-grade results at a fraction of dealer costs, covering every wear part in one convenient package. If you’re comfortable with basic wrenching and want to eliminate vibration, uneven cuts, and belt squeal, this kit will transform your mowing experience. Just be prepared to supply your own tools and a bit of patience—no instructions included, but the payoff is a deck that cuts like new. Highly recommended for the budget-conscious DIYer.

Frequently Asked Questions

Q: Will this kit fit my John Deere LA110 or D130?
A: It depends on your deck model. This kit is designed for the 42-inch Edge deck (typically found on 100-series and D100-series tractors). If your LA110 or D130 has a