SCITOO Mower Deck Rebuild Kit Fit 42 Inch Deck for John Deere 102/105/ 115/125/ 135/ D100/ D105/ D110/ D120/ D130/ LA100/ LA105/ LA110/ LA115/ LA120/ LA125/ LA135

What It Is

This SCITOO deck rebuild kit replaces the spindle assemblies, belts, and pulleys on a 42-inch John Deere mower deck. It’s designed for residential lawn tractors and zero-turn models with a stamped steel deck, restoring cutting performance when factory parts wear out.

Fitment & Compatibility

Before buying, confirm your John Deere has a 42-inch deck (measure blade tip to blade tip). The kit fits models 102, 105, 115, 125, 135, D100, D105, D110, D120, D130, LA100, LA105, LA110, LA115, LA120, LA125, and LA135. It’s aftermarket, not OEM—so check if your deck uses a 5/8-inch or 1-inch spindle shaft (this kit uses 5/8-inch). Also verify belt length (typically 1/2-inch x 92.5-inch for these models) and pulley diameter (usually 4.5-inch). If your deck has a different belt routing or spindle bolt pattern, it won’t fit.

Key Things to Know

• Quality concerns: Only 1 review at 4.0 stars—limited feedback. Aftermarket kits may use thinner metal or cheaper bearings than OEM; inspect spindle housings for cracks before installing.
• Installation difficulty: Moderate. You’ll need a socket set, torque wrench, and possibly a puller for stuck pulleys. Expect 2-3 hours.
• Common gotchas: Belt tensioner alignment is critical—misaligned pulleys cause premature belt wear. Grease all spindle bearings before use (they ship dry). Deck removal is required; mark blade orientation for reinstallation.
• Compatibility: Double-check your model’s deck serial number (usually stamped on the top). Some LA-series decks use a different belt configuration; SCITOO’s kit may not match.

Should You Buy It

Buy this kit if you need a budget-friendly rebuild for a worn 42-inch John Deere deck and are comfortable with moderate DIY work. Skip it if you want OEM reliability or have a less common deck variant—spend more on a genuine John Deere kit for guaranteed fit and better bearing life.