Mower Spindle Assembly Compatible with Cub Cadet LTX1040, LTX1042, i1042, ZTT42, Craftsman MTD 42-Inch Deck- Replaces 918-04512, 918-04512B, 918-04512A, 618-04512, 618-04512B, 618-04512A, 618-04125

What It Is

This is a replacement spindle assembly for 42-inch cutting decks on select Cub Cadet, Craftsman, and MTD lawn tractors and zero-turn mowers. It drives the mower blade via the belt and houses the bearings that allow the blade to spin freely—essential for a clean, even cut.

Fitment & Compatibility

Before buying, confirm your mower has a 42-inch deck—this spindle will not fit 46-inch or 50-inch decks. It directly replaces OEM part numbers 918-04512, 918-04512B, 918-04512A, 618-04512, 618-04512B, 618-04512A, and 618-04125. Compatible models include Cub Cadet LTX1040, LTX1042, i1042, and ZTT42, plus many Craftsman and MTD tractors with a 42-inch fabricated or stamped deck. Measure your existing spindle housing height and bolt pattern (typically three bolts on 3–3.5 inch centers) to verify physical match. This is an aftermarket part, not OEM Cub Cadet.

Key Things to Know

• Quality: 5.0-star rating from 4 reviews suggests solid build, but aftermarket spindles may use lighter-duty bearings than OEM—expect 2–3 seasons of residential use.
• Installation difficulty: Moderate. Requires removing the deck, belt, and blade, then unbolting the old spindle. A socket set, wrench, and possibly a puller for seized spindles are needed.
• Common gotchas: The spindle shaft may be slightly shorter or longer than OEM—check blade clearance to the deck shell. Also, ensure you grease the bearings (if zerk fittings are present) after installation.
• What’s included: Usually comes with the spindle housing, shaft, bearings, and mounting hardware. Does not include a new blade or belt.

Should You Buy It

Buy this if you need an affordable, drop-in replacement for a worn-out spindle on a 42-inch Cub Cadet, Craftsman, or MTD deck and are comfortable with a moderate DIY repair. It’s a good value for residential mowers, but if you mow commercially or want OEM-grade longevity, consider spending more on a factory Cub Cadet spindle.