918-06991 618-06991 Spindle Assembly for MTD Troy Bilt Craftsman 42 Inch Mower Decks Craftsman T1000 T1100 T1200 T1400 T1800 Huskee LT4200 Troy Bilt TB42 TB2246 Bronco 42 Tractor (2-Pack)

What It Is

This is a replacement spindle assembly (2-pack) that drives the mower blades on 42-inch MTD, Troy-Bilt, Craftsman, and Huskee lawn tractors. It’s designed for mid-engine riders with stamped steel decks (2000s–2010s models).

Fitment & Compatibility

• Deck size: Only for 42-inch decks (not 46, 50, or 54). Measure your deck width or check the deck model number.
• Models: Fits Craftsman T1000, T1100, T1200, T1400, T1800; Troy-Bilt TB42, TB2246, Bronco 42; Huskee LT4200; and MTD 42-inch decks with 5/8-inch spindle shafts.
• OEM vs aftermarket: This is an aftermarket part replacing OEM 918-06991 and 618-06991. Confirm your original spindle has a flat-top housing and uses two 5/16-18 mounting bolts.
• Measurements: Spindle shaft diameter is 5/8 inch; housing bolt spacing is 3-1/2 inches center-to-center. Verify before buying.
• Not compatible with zero-turn mowers, 38-inch decks, or older Craftsman models (e.g., 917 series) with different spindle designs.

Key Things to Know

• Quality: Solid steel housing with sealed bearings; holds up well for residential use, but cheaper than OEM—expect similar lifespan (~2–3 seasons with regular use).
• Installation difficulty: Moderate. You’ll need a socket set, a jack to lift the mower, and a blade removal tool. Budget 45–60 minutes for both spindles.
• Common gotcha: The included grease is minimal—pack the bearings with extra grease before installation. Also, check blade alignment after install; slightly bent spindles can cause wobble.
• No hardware included: You’ll need to reuse or buy new 5/16-18 bolts and lock washers separately (not in the pack).

Should You Buy It

Yes, if you have a compatible 42-inch MTD/Craftsman/Troy-Bilt tractor and want a reliable, affordable replacement for a worn or noisy spindle. It’s a good value for DIY homeowners who can handle basic mechanical work. Skip it if you need OEM exactness for a commercial mower or have a different deck size.