42" Deck Rebuild Kit Fit for MTD LT4200 M155-42 T1000 T1400 T1800 Mower, 2 Spindle 618-06991 918-06991, 2 Blades 742-04312 742-04308, 1 Belt 754-04060

What It Is

This 42" deck rebuild kit includes two spindle assemblies, two blades, and one drive belt, designed to restore cutting performance and reliability on MTD-branded lawn tractors with a 42-inch fabricated deck, specifically the LT4200, M155-42, T1000, T1400, and T1800 models.

Fitment & Compatibility

Before buying, confirm your mower has a 42-inch deck (measure deck width from outer blade tip to outer blade tip). The spindles (part #618-06991 / 918-06991) are direct-fit replacements for MTD decks using two-spindle configurations—verify your deck uses two spindles, not three. The blades (742-04312 and 742-04308) are 21.5-inch long, with a 1-inch center hole and 0.5-inch offset. The belt (754-04060) is a 1/2-inch wide, 103.5-inch long Kevlar-reinforced belt. Check your mower’s model number against MTD’s OEM parts list; this kit is aftermarket, not OEM, so fitment may vary slightly on non-listed models. Measure your existing spindle bolt pattern (typically 3.5-inch center-to-center) and blade length to avoid returns.

Key Things to Know

• Quality: Spindles are typically cast iron with sealed bearings—decent for residential use but may not hold up as long as OEM under heavy commercial loads. Blades are medium-grade steel; sharpen after 10-15 hours of mowing.
• Installation Difficulty: Moderate. Requires basic tools (socket set, torque wrench, jack stands). Replace spindles one at a time to keep belt alignment. Torque spindle bolts to 40-50 ft-lbs; blade bolts to 70-90 ft-lbs.
• Common Gotchas: The belt may be slightly stiff initially—run the deck for 5 minutes to seat it. Ensure the blade engagement cable is adjusted after installation to prevent slipping. Check deck leveling after reassembly.
• Missing Hardware: Kit does not include spindle bolts, blade bolts, or lock washers—reuse your old hardware or buy new Grade 8 bolts separately.

Should You Buy It

If you have a listed MTD model with a 42-inch deck and the spindles are worn (noisy, wobbling) or the blades are dull, this kit offers good value for a full refresh at ~$80. It’s ideal for DIY homeowners who want to avoid buying individual parts. Skip it if you need OEM-grade longevity for frequent heavy mowing—consider sourcing genuine MTD parts instead.