Stens New Spindle Assembly 285-923 Compatible with Toro 4200, 5000, 4216, 4235, 4260 and 5060 TimeCutter, Exmark Quest Zero-Turn mowers 117-0751, 117-7267, 117-7268, 117-7439, 121-0751

What It Is

This Stens spindle assembly (285-923) is a direct replacement for the factory spindle on select Toro TimeCutter and Exmark Quest zero-turn mowers. It houses the blade shaft and bearings that drive the cutting blade, and is designed for residential or light commercial use.

Fitment & Compatibility

Before buying, confirm your mower model and deck size. This spindle fits:

• Toro TimeCutter: 4200, 5000, 4216, 4235, 4260, 5060 (typically 42” to 50” decks)
• Exmark Quest: Zero-turn models using OEM spindles 117-0751, 117-7267, 117-7268, 117-7439, 121-0751

What to check:

• Deck size: Not all deck widths on these models use the same spindle—measure your deck and verify the blade bolt pattern (commonly 5/8” or 3/4”).
• OEM cross-reference: This Stens part replaces the Toro/Exmark numbers listed above. If your spindle has a different OEM number, it likely won’t match.
• Physical dimensions: The spindle shaft length and bearing housing diameter must match your deck’s mounting hole. Stens publishes exact specs—compare to your old spindle before ordering.

Key Things to Know

• Quality: Stens is a reputable aftermarket brand. Most users report it’s as durable as OEM at half the price. Bearings are sealed and pre-lubricated.
• Installation difficulty: Moderate. You’ll need a basic socket set, a puller to remove the old spindle (if seized), and a torque wrench for the mounting bolts (typically 30-40 ft-lbs). Expect 30-60 minutes per spindle.
• Common gotchas: The spindle pulley may not come pre-installed—you’ll need to transfer the old pulley and belt keeper. Also, the blade bolt is reverse-threaded on some models; check your manual to avoid stripping.
• Fitment nuance: While listed for TimeCutter and Quest, some 2010-2013 models may have a different bearing stack. If your deck has a 1” shaft vs. 3/4”, this won’t work.

Should You Buy It

If you need a spindle for a compatible Toro TimeCutter or Exmark Quest zero-turn and want a reliable, cost-effective replacement without paying OEM prices, this Stens assembly is a solid choice. It’s best for DIYers comfortable with basic deck disassembly and spindle removal.