Oregon 82-325 Cast Iron Spindle Assembly for Scag 46631

What It Is

The Oregon 82-325 is a cast iron spindle assembly designed to replace the OEM Scag 46631 spindle on Scag zero-turn mowers. It holds the blade and pulley, transferring engine power to cut grass, and is built for commercial-duty decks.

Fitment & Compatibility

• Primary fit: Scag Turf Tiger, Wildcat, Cheetah, and Patriot mowers with 48", 52", 61", or 72" decks that use OEM spindle part number 46631.
• Check your deck: Measure spindle housing diameter (1.5" shaft) and bolt pattern (3-hole, 2.5" center-to-center).
• OEM vs aftermarket: Oregon is a direct replacement for Scag 46631—no adapters or modifications needed.
• Verify pulley fit: Ensure your existing pulley matches the spindle’s top taper (typically 5/8" bore).
• Not for: Exmark, John Deere, or other brands unless they share the Scag 46631 spindle (rare).

Key Things to Know

• Cast iron housing is heavier than aluminum—reduces vibration but adds weight to the deck.
• Installation difficulty: Moderate. You’ll need a socket set, torque wrench (specs: 35-45 ft-lbs for spindle bolts), and a puller for stubborn old spindles.
• Common gotcha: The bearings are sealed and pre-greased—do not add grease or disassemble.
• Quality note: Oregon uses double-sealed bearings and a hardened shaft; many users report 2-3 seasons of commercial use before needing replacement.

Should You Buy It

Buy this if you have a Scag with the 46631 spindle and want a durable, drop-in replacement at half the OEM price. It’s ideal for commercial operators or homeowners with large properties who value longevity over cheapest options. Avoid if you need a spindle for a different brand or a lighter-duty residential deck.