50" Deck Rebuild Kit for Cub Cadet RZT50 RZT50VT, for MTD ZT50, for 618-04126 918-04125 Spindles with Pulley, 3 Blades for 742-04053A,3 Idles 753-08171, 1 134" Belt 754-04044 with 4 Wheels

What It Is

This is a complete 50-inch deck rebuild kit for Cub Cadet RZT50 and RZT50VT zero-turn mowers, plus compatible MTD ZT50 models. It includes three blades, three spindle assemblies with pulleys, three idler pulleys, one 134-inch drive belt, and four deck wheels—everything needed to refresh a worn-out cutting deck in one purchase.

Fitment & Compatibility

• Deck size: Only for 50-inch cutting decks. Measure your deck width before ordering.
• Models confirmed: Cub Cadet RZT50, RZT50VT, and MTD ZT50. Not for RZT42 or RZT54.
• OEM part numbers: Spindles replace 618-04126 / 918-04125; blades replace 742-04053A; idlers replace 753-08171; belt is 754-04044. Cross-check your mower’s part numbers against these.
• Aftermarket note: This is a non-OEM kit. Fitment is generally good, but some users report needing to adjust spindle bolt torque or blade alignment slightly.
• What to measure: Confirm your deck pulley diameter (typically 4.5–5 inches) and belt length (134 inches). If your belt is a different length, this kit won’t work.

Key Things to Know

• Quality variance: Spindles and blades are decent for the price, but idler pulleys may have less durable bearings than OEM. Expect 1–2 seasons of heavy use before replacement.
• Installation difficulty: Moderate. You’ll need basic mechanic skills, a socket set, and a torque wrench. Plan 2–3 hours if doing the full rebuild.
• Common gotchas: The belt routing can be tricky—take a photo of the old belt path before removing. Also, deck wheels may require drilling new holes if your deck has a different bolt pattern.
• Missing hardware: Some kits arrive without lock washers or spindle bolts. Have a hardware assortment handy.

Should You Buy It

Buy this if you need a budget-friendly, all-in-one refresh for a worn Cub Cadet RZT50 or MTD ZT50 deck and are comfortable with moderate DIY work. Skip it if you want OEM durability, have a different deck size, or prefer premium bearings and blades—invest in separate OEM parts instead.