Deck Spindle Assembly 120-5477 Compatible with Toro Titan ZX Z-Master Zero Turn 115-9693 117-1250 ZTR Riding Lawn Mower

What It Is

The Deck Spindle Assembly 120-5477 is the rotating hub that drives your mower blades. It’s designed for Toro Titan ZX and Z-Master Zero Turn mowers, replacing OEM part numbers 115-9693 and 117-1250. If your blades wobble, cut unevenly, or make grinding noises, this spindle is the fix.

Fitment & Compatibility

Before buying, confirm your mower’s deck size (48”, 50”, 54”, or 60” — this spindle fits most but not all). Check your old spindle’s bolt pattern and shaft length: the 120-5477 has a 5/8” shaft with a 1.25” diameter housing and three mounting holes on 3.25” centers. It’s compatible with Toro Titan ZX series and Z-Master models built after 2010, but verify your existing spindle number (look for 115-9693 or 117-1250 stamped on the housing). This is an aftermarket part, not OEM Toro — fit is exact for listed models, but avoid it if you need a genuine Toro warranty replacement.

Key Things to Know

• Quality vs. OEM: Aftermarket spindles like this often use sealed bearings that match OEM specs, but some users report shorter lifespan under heavy commercial use. Inspect the bearing grade (usually ABEC-1 or -3) before installing.
• Installation difficulty: Moderate. Requires removing the deck, belt, and blade. You’ll need a socket set, torque wrench (tighten spindle bolts to 30-40 ft-lbs), and a blade holder or strap. Plan 30-60 minutes per spindle.
• Common gotcha: The included grease fitting may be positioned differently than OEM. If your deck has limited clearance, pre-grease and check that the zerk isn’t blocked by the deck housing.
• Check blade fit: The spindle’s shaft keyway and blade retention hole must match your blade’s center hole (usually 1” or 5/8” diameter). Measure before buying if you’ve swapped blades.

Should You Buy It

This is a solid choice for DIY homeowners or light commercial users who want to save about 40% over OEM without sacrificing basic reliability. If you’re a professional mowing daily on rough terrain, stick with genuine Toro spindles for longer bearing life. For occasional residential use on a Titan ZX or Z-Master, this 120-5477 replacement will get you cutting straight again.