4845 - Swisher Replacement Blade Bearing for Rough-Cut Tow-Behind Mowers

What It Is

The Swisher 4845 is a replacement blade bearing hub assembly designed for Swisher rough-cut tow-behind mowers. It supports the blade spindle, allowing the blade to spin freely while cutting heavy brush and tall grass.

Fitment & Compatibility

Check your mower deck model: this bearing fits Swisher 60″ and 50″ rough-cut tow-behind mowers (models like 18660, 18665, 18670, 18675, and similar). It is not for zero-turn or walk-behind mowers. Measure the bolt pattern: the bearing has a 4-bolt flange with 3.5″ center-to-center spacing and a 1″-diameter shaft. Verify your existing bearing has the same hole pattern and shaft diameter—aftermarket copies may vary. Swisher recommends OEM replacement for consistent fit.

Key Things to Know

• Quality: OEM-grade steel housing with sealed bearings; holds up to heavy brush and debris, but not designed for impact with rocks or stumps.
• Installation: Moderate difficulty—requires removing the old bearing (may need a puller if rusted), then bolting the new one on with a new blade. Expect 30–60 minutes.
• Gotcha: The bearing is pre-greased and sealed—do not attempt to re-grease. If you hear grinding, replace immediately to avoid blade damage or spindle failure.
• Common issue: The flange bolts are 5/16″-18; use thread locker to prevent loosening from vibration.

Should You Buy It

If you own a Swisher rough-cut tow-behind mower and the blade wobbles, makes noise, or won’t spin freely, this is the correct OEM replacement. It’s a solid value for restoring cutting performance, but if your deck is damaged or the spindle housing is bent, you may need a full spindle assembly instead.