Scag 451845 Yoke Weldment, Caster Wheel

What It Is

The Scag 451845 Yoke Weldment is the factory replacement caster wheel fork assembly for select Scag commercial zero-turn mowers. It holds the front caster wheel and allows it to pivot, supporting the mower deck’s weight during turns and rough terrain use.

Fitment & Compatibility

Before buying, verify your Scag model and deck size. This yoke fits many Scag commercial mowers with 48", 52", 61", or 72" decks, including Cheetah, Tiger Cat, Turf Tiger, Wildcat, and Patriot series (2010 and newer). Check the original yoke for a stamped part number—if it matches 451845, it’s a direct swap. Measure the caster wheel stem diameter (typically 5/8" or 3/4") and the yoke’s mounting bolt spacing (usually 2.5" center-to-center). This is an OEM Scag part; aftermarket alternatives may differ in metal thickness or bearing quality. Not for residential or older pre-2005 models.

Key Things to Know

• Build quality: OEM scag uses heavy-gauge steel; aftermarket yokes may bend under heavy commercial use, so stick with genuine for longevity.
• Installation: Moderate difficulty—requires removing the caster wheel, old yoke, and pivot bolt. You’ll need a jack to lift the mower’s front end safely. Expect 30–60 minutes per side.
• Common gotchas: The pivot bushing or bearing (sold separately) often wears out at the same time; replace it while you’re in there. Torque the pivot bolt to 35–45 ft-lbs to avoid play or binding.
• Wheel compatibility: The yoke accepts standard 11x4.00-5 or 13x5.00-6 caster wheels; check your current wheel’s size and hub offset to ensure it sits straight.

Should You Buy It

Buy this if your Scag’s caster yoke is bent, cracked, or has worn pivot holes causing wobble or uneven cutting. It’s the right choice for commercial operators who need a direct OEM fit without guessing aftermarket tolerances. Skip it if your mower is a residential model or pre-2005—verify compatibility first. For DIY repairs, it’s a solid investment that restores steering precision and deck stability.