618-06989 918-06989 Spindle Assembly Fit for 46 inch Deck MTD Troy-Bilt T1500 T1600 LT 4600 CLT46CVT TB46 for Craftsman T135 T140 T150 Bronco Horse XP Huskee LT 4600 Mower 2 Pack

What It Is

This is a replacement spindle assembly for 46-inch cutting decks on select MTD, Troy-Bilt, and Craftsman lawn tractors. It houses the blade spindle bearings and pulley, transferring engine power to spin the mower blades. Sold as a 2-pack for replacing both outer spindles on a three-spindle deck.

Fitment & Compatibility

Before buying, confirm your mower has a 46-inch three-blade deck and uses a 1-inch diameter spindle shaft with a 5/8-inch blade bolt hole. The OEM numbers 618-06989 and 918-06989 cross to many MTD-based models, including:

• Troy-Bilt: T1500, T1600, LT 4600, CLT46CVT, TB46
• Craftsman: T135, T140, T150, Bronco, Horse, XP
• Huskee: LT 4600

Verify your mower’s model number (stamped on the frame or deck) against the manufacturer’s parts list. This assembly is not for 42-inch or 54-inch decks, nor for zero-turn mowers. Measure the spindle housing bolt pattern (typically 3.5 inches center-to-center) and the pulley diameter (usually 4.5 inches) to match your existing unit.

Key Things to Know

• Quality vs OEM: Aftermarket part; bearings may be less durable than OEM Troy-Bilt. Inspect for smooth rotation before installation.
• Installation difficulty: Moderate. Requires removing the deck, blade, pulley, and old spindle. A puller may be needed for seized spindles. Torque blade bolts to 30-50 ft-lbs.
• Common gotcha: The included pulley may not match your original (different hole patterns or offset). Reuse your old pulley if needed.
• Deck alignment: After replacement, ensure blades are level and properly timed (if your deck uses a timing belt). Misalignment causes vibration and poor cut.

Should You Buy It

This 2-pack is a good budget option for DIYers replacing worn spindles on compatible 46-inch MTD/Craftsman tractors. It works best if you’re comfortable with basic mechanical work and don’t need OEM longevity. For heavy commercial use, consider spending more on OEM spindles for better bearing life.