121-0751 Spindle Assembly with 125-5574 Spindle Pulley Replaces Toro 139-3214 Spindle Assembly 117-7267 117-7439 117-7268 for Toro Timecutter SS4200 SS4225 SS4235 SS4260 MX4250 42" Mowers

What It Is

This is a complete spindle assembly with a pre-installed pulley (125-5574), designed to drive the cutting blades on select Toro Timecutter zero-turn mowers with 42-inch decks. It replaces worn or failed spindles that cause blade wobble, vibration, or uneven cutting.

Fitment & Compatibility

Before buying, confirm your mower model and deck size. This assembly fits Toro Timecutter models: SS4200, SS4225, SS4235, SS4260, and MX4250—all with 42-inch decks. It replaces OEM Toro part numbers 139-3214, 117-7267, 117-7439, and 117-7268. Measure the spindle bolt pattern (center-to-center distance between mounting holes) to ensure it matches your deck—typically 3.5 inches on these models. Also verify the pulley diameter (4 inches) and belt type. If your deck uses a different belt width or pulley size, this won’t work. Check your existing spindle for wear or damage before ordering—if only the pulley is bad, you might save money buying just the pulley.

Key Things to Know

• Quality: Aftermarket replacement with a 4.1-star average from 12 reviews. Some users report shorter lifespan than OEM, but acceptable for light-to-moderate use.
• Installation: Moderate difficulty—requires removing the deck, belt, and blade. You’ll need a socket set, torque wrench (blade bolt torque ~50-60 ft-lbs), and possibly a puller for stubborn spindles. Budget 1-2 hours.
• Common gotcha: The pulley is pre-installed, but check that the spindle shaft is straight and bearings spin smoothly before mounting. If you have multiple spindles, replace all at once to avoid uneven wear.
• Belt alignment: After installation, ensure the pulley aligns with the deck belt path. Misalignment causes premature belt wear or slipping.

Should You Buy It

If you need a budget-friendly replacement for a worn spindle on a Toro Timecutter 42-inch deck and are comfortable with moderate DIY work, this is a solid choice. For heavy commercial use or if you want maximum durability, consider OEM Toro—but expect to pay 2-3x more.