918-05078 Spindle Assembly Fit for Cub-Cad et 46" Deck Mower, 618-05078 Spindle Compatible with MTD Craftsman Troy-Bilt RZT-L46 RZT-S46 MTD ZT-S46 Z6400, 1 Pack

What It Is

The 918-05078 spindle assembly is the rotating hub that drives the mower blade on 46-inch deck mowers. It’s designed for Cub Cadet, MTD, Craftsman, and Troy-Bilt zero-turn and lawn tractors, replacing worn or failed spindles to restore cutting performance.

Fitment & Compatibility

Before buying, verify these three things:

• Deck size & model: This spindle fits 46-inch decks only. Confirm your mower’s deck size (measure if unsure). Compatible with Troy-Bilt RZT-L46, RZT-S46, MTD ZT-S46, and Cub Cadet models using a 46-inch deck.
• OEM cross-reference: Replaces OEM part numbers 618-05078 and 918-05078. If your original spindle has a different number, measure the mounting hole pattern (typically 3-bolt, 3.5-inch center-to-center) and shaft diameter (5/8-inch) to confirm fit.
• Brand & model list: Works on many MTD-built units, but not all. Check your mower’s model number (stamped under seat or on frame) against the seller’s compatibility list. Common fits: Cub Cadet LT46, Craftsman ZT 7000, Troy-Bilt TB30R.

Pro tip: If your old spindle has a grease fitting or a different bearing type, this aftermarket replacement may lack one—verify before ordering.

Key Things to Know

• Quality vs OEM: This is an aftermarket part. It’s functional and well-reviewed (4.8 stars), but may not last as long as OEM. Expect 1-2 seasons under heavy use.
• Installation difficulty: Moderate. You’ll need a socket set, jack, and possibly a puller to remove the old spindle. Plan 30-60 minutes per spindle.
• Common gotchas: The pulley bolt can be tight—use penetrating oil. Also, check blade alignment after install; a bent spindle will cause vibration.
• Single pack: This is one spindle. If your deck has two or three spindles, buy multiple.

Should You Buy It

If you need a budget-friendly replacement for a worn spindle on a 46-inch MTD-family deck and you’re comfortable with basic mechanical work, this is a solid choice. It’s not for heavy commercial use, but for residential mowing, the price and rating make it a reliable pick.