3 Pack 121-0751 Spindle Assembly with 125-5575 Pulley 119-8820 Belt Replace Toro 139-3214 Spindle Assembly 117-7267 117-7439 117-7268 for Toro SS5000 SS5060 MX5000 MX5050 MX5060 50" Mowers

What It Is

This is a 3-pack of spindle assemblies (each with a pre-installed pulley and belt) designed for Toro 50-inch zero-turn mowers. It replaces the OEM 139-3214 spindle assembly and is a direct fit for TimeCutter and Titan models with a 50-inch deck.

Fitment & Compatibility

Check these before buying:

• Deck size: Only for 50-inch (127 cm) cutting decks. Will not fit 42-inch or 54-inch decks.
• Model fit: Confirmed for Toro SS5000, SS5060, MX5000, MX5050, MX5060. Also fits TimeCutter SS5000/SS5060 and Titan MX5000/MX5050/MX5060.
• OEM cross-reference: Replaces Toro 139-3214, 117-7267, 117-7439, 117-7268. The included 125-5575 pulley and 119-8820 belt are exact matches for the OEM parts.
• Housing dimensions: Spindle housing is 5.5 inches tall with a 1-inch diameter shaft and a 3/8-inch keyway. Pulley is 4-inch diameter. Measure your old spindle to confirm.
• Belt included: The 119-8820 belt is a 92.5-inch Kevlar-reinforced belt. Verify your deck’s belt routing matches.

Key Things to Know

• Quality: Aftermarket spindle with sealed bearings and a steel housing. Comparable to OEM but at a lower price point. Some users report the bearings are pre-greased and last 2-3 seasons with normal use.
• Installation: Moderate difficulty. Requires removing the deck, belt, and old spindle. You’ll need a 15/16-inch socket for the spindle nut and a 3/8-inch Allen key for the pulley bolt. Torque spindle nut to 40-50 ft-lbs.
• Common gotcha: The pulley is pre-installed but may need re-tightening after the first hour of use. Check belt tension after installation—if it’s too loose, the deck may vibrate or cut unevenly.
• Warranty: Typically 1-year limited warranty from the seller. No Toro warranty since it’s aftermarket.

Should You Buy It

If you own one of the listed Toro 50-inch ZTR models and need to replace worn or failing spindles, this 3-pack is a cost-effective alternative to OEM parts. It’s best for DIY owners comfortable with basic deck removal and spindle replacement. Avoid if you prefer OEM-only parts or need a single spindle (this ships as a 3-pack only).