618-09236 Spindle and Pulley Assembly for Cub Cadet MTD Craftsman Troy Bilt XT1 GT54 ST54 Z5800 T3200 Mustang 54XP 54-Inch Replacement Part Number 618-09236 618P09236

What It Is

The 618-09236 Spindle and Pulley Assembly is a replacement part for the blade drive system on 54-inch mower decks used in Cub Cadet, MTD, Craftsman, and Troy Bilt zero-turn and lawn tractors. It houses the spindle shaft and pulley that rotate the cutting blade.

Fitment & Compatibility

Critical checks before buying:

• Deck size: Only for 54-inch decks (e.g., XT1 GT54, ST54, Z5800, T3200, Mustang 54XP). Will not fit 46” or 50” decks.
• OEM vs aftermarket: This is a genuine Cub Cadet part (OEM). Aftermarket spindles may have different bearing quality or shaft length—stick with OEM for exact fit.
• Measurements: Spindle shaft diameter is 5/8”, pulley diameter is 4.5”. Verify your existing spindle matches these dimensions.
• Bolt pattern: Uses three 5/16” mounting bolts (not included). Check bolt hole spacing matches your deck’s pattern.

Key Things to Know

• Quality: OEM part with sealed bearings—reliable but not heavy-duty. For commercial use, consider a heavier aftermarket option.
• Installation difficulty: Moderate. Requires removing the deck, belt, and blade. A wrench set and a puller may be needed for stuck spindles.
• Gotcha: This is the upper spindle assembly only—does not include the blade brake or lower housing. If your deck has a blade brake system, you may need additional parts.
• Common failure: Pulley teeth can wear out from belt slip—check belt tension and condition before installing a new spindle.

Should You Buy It

Buy this if you own a 54” Cub Cadet, MTD, Craftsman, or Troy Bilt tractor and need a direct OEM replacement for a worn or broken spindle. It’s the right choice for home lawn care with moderate use, but skip it if you need a lower spindle or blade brake components—or if you want a heavier-duty spindle for commercial mowing.