618-06989 Spindle Assembly / 46 inch Deck/for MTD Troy-Bilt 918-06989 T1500 T1600 LT 4600 CLT46CVT(1Pack)

What It Is

This is a replacement spindle assembly for 46-inch cutting decks on select MTD, Troy-Bilt, and Cub Cadet lawn tractors. It houses the blade spindle bearings and mounts the blade, enabling the deck to spin the cutting blade properly.

Fitment & Compatibility

• Deck size: Designed for 46-inch decks only—do not use on smaller or larger decks.
• Models: Fits MTD Troy-Bilt T1500, T1600, LT 4600, CLT46CVT, and MTD models using OEM part 918-06989. Also compatible with Cub Cadet and Yard Machines variants with the same spindle.
• OEM vs. aftermarket: This is a direct OEM-style replacement, not a universal or adjustable spindle. It matches the original 918-06989 in bolt pattern, shaft length, and pulley mount.
• Physical check before buying: Measure your existing spindle’s bolt hole spacing (typically 2.5–3 inches center-to-center) and shaft diameter (usually 5/8 or 3/4 inch). Verify the pulley is removable (this spindle does not include a pulley). Also confirm your deck has a single-blade spindle (not a dual-blade or offset design).

Key Things to Know

• Installation difficulty: Moderate. Requires basic tools (socket wrench, torque wrench, possibly a puller for the old spindle). Expect 30–60 minutes per spindle.
• Quality: Solid OEM-grade construction with sealed bearings. The 5.0 rating reflects good durability for residential use, but not heavy commercial duty.
• Common gotcha: The spindle comes without a pulley—reuse your existing one. Check pulley bore size and keyway alignment before installing.
• Need to replace both? If one spindle failed, inspect the others. Bearing wear often occurs at similar rates on the same deck. Replacing both at once saves future downtime.

Should You Buy It

If you have a 46-inch MTD/Troy-Bilt tractor with a bad spindle and want a drop-in replacement without modifying brackets or pulleys, this is a reliable, well-priced choice. It’s best for residential mowing and DIY repairs—not for high-hour commercial use.