8TEN Deck Blade Spindle Kit for MTD Troy Bilt RZT 42 Pony Bronco Colt XP 42-Inch 918-0624 942-04308-X

What It Is

This is a complete deck blade spindle assembly (housing, bearings, shaft) designed to replace a worn or failed spindle on MTD/Troy-Bilt 42-inch zero-turn and lawn tractors. It’s the rotating hub that drives your mower blade—if it’s grinding, wobbling, or seized, this is the fix.

Fitment & Compatibility

• Deck size: 42-inch (must measure your deck—will not fit 46-inch or 50-inch decks).
• OEM numbers: Replaces MTD/Troy-Bilt 918-0624, 942-04308, 942-04308-X.
• Fits models: MTD RZT 42, Troy-Bilt Pony, Bronco, Colt, XP, and Cub Cadet RZT 42 (check your model number tag under the seat or deck).
• OEM vs aftermarket: This is an aftermarket spindle. It uses standard 5/8-inch hex shaft and same bolt pattern as OEM, but confirm your existing pulley center hole diameter (likely 1-inch) matches the new spindle’s shaft.
• What to measure: Bolt spacing (center-to-center on mounting holes) should be 3.5 inches. Also verify pulley bolt size (usually 5/16″ or 3/8″).

Key Things to Know

• Quality: Good bearings and steel housing for the price. Rated 5.0 from limited reviews—no red flags yet.
• Installation difficulty: Moderate—requires removing deck, belt, pulley, and blade. You’ll need a socket set, breaker bar, and possibly a puller if the old spindle is rusted.
• Common gotchas: The supplied bolts may be slightly short if your deck has a thick mounting bracket. Reuse your original pulley unless it’s damaged. Torque spindle bolts to 30–40 ft-lbs; blade bolt to 70–90 ft-lbs.
• Wear items: Always replace the blade and belt if they’re old—a new spindle won’t fix a dull blade or stretched belt.

Should You Buy It

Yes, if you have a 42-inch MTD/Troy-Bilt deck with a bad spindle and want a solid, budget-friendly replacement. It’s not a premium OEM part, but for $62.95 it’s a reliable fix for most homeowners. Skip it if you need exact OEM fit for a commercial use or if your deck is a different size.