42 Inch Mower Deck Kit Fit Cub Cadet MTD Troy-Bilt RZT-42 LTX1040 LTX1042 RZT Mower Parts Includes 2 918-04822 618-04889 Spindle 2 756-04129B Pulley 1 754-04060 Belt

What It Is

This is a complete 42-inch mower deck rebuild kit for Cub Cadet, MTD, and Troy-Bilt zero-turn and lawn tractors. It includes two spindle assemblies (918-04822 / 618-04889), two pulleys (756-04129B), and one drive belt (754-04060) to replace worn-out deck components that cause vibration, uneven cutting, or belt slippage.

Fitment & Compatibility

Before buying, verify your mower has a 42-inch stamped steel deck (not fabricated or 46/50-inch). This kit fits models like Cub Cadet RZT-42, LTX1040, LTX1042, and Troy-Bilt equivalents with MTD-based chassis from the 2000s onward. Check your spindle housing bolt pattern—these use a 4-bolt square pattern with 1-inch diameter bearings. Measure your belt length; the included 754-04060 is a 1/2-inch x 96.5-inch Kevlar belt. If your deck uses a different belt length or spindle shaft diameter (e.g., 5/8-inch vs. 3/4-inch), this kit won’t work. Always cross-reference your OEM part numbers against the list above.

Key Things to Know

• Quality: Aftermarket spindles and pulleys are zinc-plated steel with sealed bearings—comparable to OEM, but the belt may wear slightly faster than a genuine MTD belt.
• Installation: Moderate difficulty—requires removing the deck, swapping spindles, and tensioning the belt. You’ll need a socket set, jack stands, and possibly a puller for stuck pulleys.
• Common gotcha: The pulleys fit a 3/4-inch shaft; if your spindles have a 5/8-inch shaft, you’ll need adapter bushings or a different kit. Also, the belt routing must match your deck’s idler pulley setup—check your manual.
• Cost savings: Buying this kit is about 40% cheaper than sourcing OEM parts individually, but check that all components are included (some sellers omit hardware like lock washers).

Should You Buy It

If your 42-inch Cub Cadet or Troy-Bilt mower deck is vibrating, cutting unevenly, or chewing belts, this kit is a solid, cost-effective fix. It’s best for DIY owners comfortable with basic mechanical work—skip it if you want OEM-only parts or have a non-MTD deck design.