618-06989 918-06989 Spindle Assembly Fit for 46 inch Craftsman T135 T140 T150 T1500 T1600 T1700 T1900 MTD Troy Bilt TB46 Bronco Horse XP Huskee LT 4600 46" Lawn Mower Deck

What It Is

This spindle assembly (part numbers 618-06989 and 918-06989) is a replacement mandrel for the 46-inch cutting decks on Craftsman T-series lawn tractors and several compatible MTD-built machines. It houses the bearings and pulley that spin your mower blade.

Fitment & Compatibility

Before buying, confirm your deck is exactly 46 inches wide (measure cutting width, not overall deck). The spindle fits Craftsman T135, T140, T150, T1500, T1600, T1700, T1900 models, plus Troy-Bilt TB46 Bronco, Horse XP, and Huskee LT 4600. It also works on many MTD 46-inch decks. This is an aftermarket part, not OEM, but matches the original dimensions and bolt pattern. Check that you have the same spindle style – some 46-inch decks use a different spindle with a shorter shaft or different bearing size. Measure the shaft diameter (should be 0.75 inches) and overall spindle height (typically 5.5 inches) to confirm.

Key Things to Know

• Quality: Most users report this spindle holds up well for residential use, but bearings may wear faster under heavy commercial or rough-terrain mowing.
• Installation difficulty: Moderate. You’ll need wrenches, a socket set, and possibly a puller to remove the old spindle from the deck. Expect 30-60 minutes per spindle.
• Common gotcha: The pulley on your old spindle might be reused – check if the new one includes a pulley (this listing is spindle-only). Also, the spindle housing may not match the same color or finish as OEM, but fitment is identical.
• Blade alignment: After installing, verify the blade spins level and doesn’t wobble. Tighten the spindle nut to spec (typically 40-50 ft-lbs) to avoid loosening.

Should You Buy It

If you need a budget-friendly replacement for a worn or damaged spindle on a residential 46-inch Craftsman or MTD-based deck, this is a solid choice. It’s not built for heavy commercial use, but for typical lawn care it offers reliable performance at half the OEM price. Skip it if you need a pulley included or require exact OEM branding.