Exmark 103-1236 Caster Wheel 500S Metro Five Speed Viking Hydro S Series

What It Is

This is an OEM replacement caster wheel assembly for Exmark zero-turn mowers, specifically designed for the 500S, Metro, Five Speed, Viking, and Hydro S Series models. It provides smooth steering and load support for the front of the mower.

Fitment & Compatibility

Before buying, verify your Exmark model and deck size. This wheel fits 36", 42", 48", 50", and 52" decks on the listed series. Check your mower’s serial number against Exmark’s compatibility chart—this part is for older models (pre-2010) in many cases. It is an OEM Exmark part (103-1236), so no aftermarket cross-reference exists. Measure the existing wheel’s bolt pattern (typically 5/8" axle hole) and overall diameter (approx. 11" with tire) to confirm. If your caster fork is damaged, you may need the fork assembly separately.

Key Things to Know

• Quality: OEM build with a sealed bearing and a solid rubber tire—holds up well on turf and hard surfaces, but the tire can wear faster on concrete.
• Installation: Moderate difficulty. You’ll need a jack to lift the mower, a socket set, and possibly penetrating oil for rusted bolts. The caster swivel can be stiff initially; spin it manually before mounting.
• Common Gotchas: The axle bolt may be seized from corrosion—plan for replacement. Also, check that the caster stem (if separate) isn’t bent, as this wheel assembly does not include the fork.
• Price Point: At $199, it’s steep compared to aftermarket generic wheels, but fitment is guaranteed for Exmark owners.

Should You Buy It

Buy this if you own a compatible Exmark series and need a direct OEM replacement that bolts on without modification. It’s best for owners who prioritize exact fit and durability over cost. If your caster fork is also worn, you’ll need to buy that separately, so inspect the whole assembly first.