Stens Caster Yoke 285-556 Compatible with Exmark Lazer Z Triton Decks, Serial No. 600,000 and Higher and Next Lazer Z Serial No. 790,000 and Higher with 52', 60' and 72' Decks 103-1474, 116-8888

What It Is

The Stens Caster Yoke 285-556 is a direct-replacement axle bracket that holds the front caster wheel assembly on Exmark Lazer Z and Next Lazer Z zero-turn mowers. It’s designed for commercial-grade decks (52", 60", 72") on machines with serial numbers above 600,000 (Lazer Z) or 790,000 (Next Lazer Z), typically used by landscapers and heavy-duty homeowners.

Fitment & Compatibility

Check these before buying:

• Deck size: Fits 52", 60", and 72" decks only—not smaller residential decks.
• Serial number: Lazer Z Triton decks: serial no. 600,000 and higher. Next Lazer Z: serial no. 790,000 and higher. Verify on your mower’s frame tag.
• OEM cross-reference: Replaces Exmark OEM parts 103-1474 and 116-8888. If your original yoke has a different OEM number, measure bolt spacing and spindle diameter.
• Physical check: Measure the yoke’s center-to-center bolt hole distance (approximately 3.5") and spindle bore diameter (typically 0.75"). Stens 285-556 matches these specs for the listed Exmark models.

Not compatible with older Lazer Z models (below serial 600,000) or other brands (e.g., Scag, Toro, John Deere).

Key Things to Know

• Quality: Stens is a well-regarded aftermarket brand—this yoke is cast iron, similar to OEM, but may have slightly looser tolerances. Check for burrs on the spindle bore before installation.
• Installation difficulty: Moderate. You’ll need a jack to lift the deck, a socket set, and potentially a press to remove the old spindle bearing. Plan 30–60 minutes per yoke.
• Common gotcha: The included hardware may not match your existing grade 8 bolts—use your original bolts if they’re in good condition. Torque to 40–50 ft-lbs.
• Wear indicator: If your caster wobbles or the yoke cracks at the weld, replace immediately. This part is a common failure point on heavy-use mowers.

Should You Buy It

Buy this if you need a direct-fit, cost-saving replacement for a worn Exmark caster yoke on a compatible Lazer Z or Next Lazer Z with a 52", 60", or 72" deck. It’s a solid aftermarket alternative to OEM (which can cost 2–3x more) for commercial or frequent residential use. Skip it if you have an older serial number or a different brand—verify fitment first to avoid returns.