50 inch Mower Deck Rebuild Kit Fit for Cub Cadet RZT50 RZT-50 ZT-50 MTD LT1050 Troy-Bilt Mustang XP Mower Includes 3 Spindle 618-04126 3 Blade 742-04053 1 Be lt 754-04044 3 Idler 753-08171 4 Wheel

What It Is

This is a complete 50-inch mower deck rebuild kit designed to restore cutting performance on select Cub Cadet, MTD, and Troy-Bilt zero-turn and lawn tractors. It includes three spindle assemblies, three blades, one belt, three idler pulleys, and four gauge wheels—everything needed for a full deck overhaul.

Fitment & Compatibility

Before buying, verify your mower has a 50-inch stamped steel deck and matches one of these models: Cub Cadet RZT50, RZT-50, ZT-50, LT1050, or Troy-Bilt Mustang XP. Measure your deck width (blade tip to blade tip) to confirm 50 inches. This is an aftermarket kit, not OEM Cub Cadet, so parts may have slight finish differences but are designed to be direct replacements. Check that your existing spindles use the 618-04126 part number and blades are 742-04053—these are the kit’s reference numbers. The belt (754-04044) and idlers (753-08171) must match your deck’s pulley layout; measure your old belt length if possible.

Key Things to Know

• Quality varies by brand – Some users report aftermarket spindles have shorter bearing life than OEM. Inspect grease seals and spin test before installation.
• Installation difficulty: moderate – Requires basic tools (socket set, jack/stands, and possibly a puller for old spindles). Expect 2–4 hours if replacing everything.
• Blades may need balancing – The included blades are typically stamped steel; check balance with a simple nail or balancer to avoid vibration.
• Check deck shell condition – If your deck is rusted or bent, new parts won’t fix alignment issues. Replace spindles and blades only if bearings are shot or blades are dull/bent.

Should You Buy It

Buy this kit if your 50-inch Cub Cadet or compatible mower has worn spindles (noisy, wobbling), dull or damaged blades, and a stretched or cracked belt. It’s a cost-effective way to refresh an aging deck in one go, saving time versus ordering parts individually. Skip it if you only need blades or a belt, or if your deck shell is heavily corroded—those issues require separate repairs.