116-5712 Mower Spindle Assembly for 42"/48"/52" Deck, Compatible with Ex-Mark Toro Quest QST20BE422 QST22BE482 QST23KC482 QST23KC522 QST24BE522, Replaces 116-3497 109-8744 109-6394, 1 Pack

What It Is

This is a replacement spindle assembly for the cutting deck on select Ex-Mark and Toro Quest series zero-turn mowers with 42", 48", or 52" decks. It houses the blade shaft and bearings that spin the mower blade, and it’s a common wear item when blades wobble, the deck vibrates, or the spindle seizes.

Fitment & Compatibility

• Deck size must match: Works only on 42", 48", or 52" decks. Measure your deck width or check your model tag before ordering.
• Confirmed compatible models: Ex-Mark Lazer Z (42/48/52), Toro Quest QST20BE422, QST22BE482, QST23KC482, QST23KC522, QST24BE522. Not for all Toro or Ex-Mark decks—verify your model number.
• Replaces OEM part numbers: 116-3497, 109-8744, 109-6394. If your current spindle has one of these numbers, this is a direct swap.
• Physical check: Measure the spindle shaft diameter (typically 1") and bolt pattern (usually 3-bolt, 3.5" center-to-center). Compare to your old spindle to avoid a mismatch.
• Note: This is an aftermarket part, not OEM Toro. It may use slightly different bearing quality or housing finish.

Key Things to Know

• Installation difficulty: Moderate. Requires removing the deck, unbolting the old spindle, and transferring the blade and pulley. Basic hand tools and a torque wrench are needed.
• Common gotcha: The spindle pulley nut can be very tight. Use a breaker bar and impact socket. Mark the pulley orientation before removal.
• Quality: Budget-friendly option. Bearings are sealed and pre-lubricated, but may not last as long as OEM Toro spindles under heavy commercial use.
• Warranty: No manufacturer warranty beyond basic return policy—inspect for damage immediately.

Should You Buy It

If you own one of the listed Toro Quest or Ex-Mark models and need a quick, affordable spindle replacement for a residential or light commercial deck, this is a solid value. Skip it if you’re running a heavy commercial fleet or need OEM-grade longevity—buy the genuine Toro spindle instead.