Deck Spindle Blade Belt Kit for MTD Columbia Troy Bilt 42 inch LT4200 M115-42 T1000 T1400 T1800 Bronco Pony, Includes 618-06991 918-06991 Spindle, 742-04308 742-04312 Blade, 753-08171 Belt

What It Is

This is a complete deck spindle blade belt kit for 42-inch MTD-branded lawn tractors (Columbia, Troy-Bilt, Cub Cadet, Yard Machines). It replaces the spindle assembly, two blades, and the drive belt—everything needed to refresh a worn or damaged cutting deck in one purchase.

Fitment & Compatibility

Before buying, confirm your mower has a 42-inch stamped steel deck and uses a single V-belt (not a Kevlar or Poly-V). This kit fits MTD models like the LT4200, M115-42, T1000, T1400, T1800, Bronco, and Pony—but verify your machine’s model number on the frame tag, not the deck sticker. The included OEM-equivalent part numbers are 618-06991 / 918-06991 (spindle assembly), 742-04308 / 742-04312 (blades, 21.5-inch length), and 753-08171 (belt, 96.5-inch length). Measure your existing blades and belt length to be sure—aftermarket decks sometimes differ slightly. Not compatible with 46-inch or 50-inch decks.

Key Things to Know

• Quality: Spindle uses sealed bearings and a cast iron housing—more durable than stamped steel spindles. Blades are OEM-spec thickness (0.250 inch) and heat-treated for long life.
• Installation: Moderate difficulty (1-2 hours). You’ll need a socket set, torque wrench, and a blade removal tool. The spindle nut torque is 40-50 ft-lbs; blade bolts are 70-90 ft-lbs. Over-tightening can warp the blade or strip the spindle.
• Gotchas: The belt routing is critical—check your deck’s diagram or take a photo before removing the old belt. The spindle assembly may require a puller if rusted in. Always replace blades in pairs to avoid vibration.
• Warranty: Usually 90-day manufacturer defect coverage—keep the box and receipt.

Should You Buy It

If your MTD 42-inch deck has a wobbly spindle, dull blades, or a glazed/squealing belt, this kit is a solid value at $81. It’s ideal for DIYers who want one-and-done replacement with OEM-grade parts, not cheap knockoffs. Skip it if you only need a blade or belt individually—buying separate OEM parts may be cheaper.