139-3214 Spindle Assembly with 125-5575 Pulley Replaces 121-0751, 139 3214, 1393214, 121 0751, 117-7267, 117-7439 for Toro Timecutter SS5000, MX5060 MX5000 MX5050 SS5060 SS 5000 50" Mowers

What It Is

This is a replacement spindle assembly with a pre-installed pulley (part 125-5575) for the cutting deck on Toro TimeCutter zero-turn mowers. It drives the blade, and the bundle saves you from buying the spindle and pulley separately.

Fitment & Compatibility

Before buying, confirm your mower has a 50-inch fabricated deck. This assembly is designed for Toro TimeCutter models (SS5000, SS5060, MX5060, MX5000, MX5050) and replaces OEM part numbers 121-0751, 139-3214, 117-7267, and 117-7439. Check your deck’s underside for the existing spindle part number—if it matches any listed here, it will fit. Measure the spindle housing diameter (approx. 2.5 inches) and bolt pattern (three bolts, 5.5-inch center-to-center). This is an aftermarket part, not genuine Toro, so verify the pulley groove width matches your belt (typically 0.5-inch for 50-inch decks).

Key Things to Know

• Quality: Aftermarket spindle, often made of cast iron. Reviews note it’s durable but may have slightly looser bearing tolerances than OEM. Expect 200-300 hours of life under normal residential use.
• Installation Difficulty: Moderate. You’ll need a socket set, torque wrench (tighten bolts to 30-35 ft-lbs), and possibly a puller to remove the old spindle. The pulley comes pre-attached, so no separate assembly.
• Common Gotcha: The spindle shaft may be 1/8-inch shorter than OEM on some units. This can cause the blade to sit slightly lower—check blade clearance with the deck shell before tightening fully. If it rubs, add a washer under the blade.
• Belt Fit: The pulley is 5.5 inches in diameter. If your belt is worn, replace it at the same time to avoid premature wear on the new spindle.

Should You Buy It

Buy this if you own a Toro TimeCutter with a 50-inch deck and want a cost-effective replacement (roughly half the price of genuine Toro). It’s a solid choice for DIY homeowners who don’t need commercial-grade longevity and can tolerate a minor fitment check. Skip it if you run a landscaping business or want a guaranteed OEM fit.