50 inch Mower Deck Rebuild kit for MTD Cub Cadet Troy Bilt RZT-50 LT1050 Mustang XP 50 Includes 3 Spindle 918-04125C 918-04126b, 3 Blade 742-04053 942-04053, 3 Idler 756-04129, 1 Be lt 754-04044

What It Is

This is a complete 50-inch mower deck rebuild kit for MTD-built zero-turn and lawn tractors with a 50-inch fabricated deck. It includes three spindles, three blades, three idler pulleys, and one drive belt—everything needed to refresh a worn-out cutting deck in one purchase.

Fitment & Compatibility

Before buying, verify your deck is exactly 50 inches wide—not 46, 48, or 54 inches. This kit fits MTD, Cub Cadet, Troy-Bilt, and Mustang models such as RZT-50, LT1050, and XP 50, but only those with a fabricated (flat steel) deck, not stamped. The spindles (918-04125C, 918-04126B) are OEM replacements; check your current spindle part numbers match. The blades (742-04053 / 942-04053) are 16.5 inches long with a 1-inch center hole and 5-point star drive—measure your existing blades to confirm. The idler pulleys (756-04129) and belt (754-04044, 1/2 x 96.5 inches) are specific to this deck layout. If your deck uses a different belt length or pulley diameter, this kit won’t work.

Key Things to Know

• Quality: Spindles and blades are solid aftermarket parts, not OEM—some users report slightly thinner blade steel. Idler pulleys and belt are reliable for regular homeowner use.
• Installation difficulty: Moderate. You’ll need a socket set, torque wrench, and jack stands. Expect 2–3 hours if replacing everything. Watch for spindle bearing preload specs (typically 20–25 ft-lbs).
• Common gotcha: The belt tensioner spring is not included—reuse yours or buy separately. Also, the blades may require balancing after installation; don’t skip it.
• Warranty: No manufacturer warranty listed; check seller’s return policy before buying.

Should You Buy It

This kit is ideal if you have a 50-inch fabricated deck MTD/Cub Cadet/Troy-Bilt mower and want a one-box solution to restore cutting performance without sourcing parts individually. It’s a good value for homeowners, but commercial users may prefer OEM spindles for longer life. If your deck is stamped steel or a different brand, pass.