3 Pack 139-3214 Spindle Assembly with 125-5575 Pulley 1/2x142 Belt Replaces Toro 139-3214 117-7439 121-0751 117-7267 for Toro Timecutter 50" MX5000 MX5050 MX5060 SS5000 SS5060 SW5000 Mowers

What It Is

This 3-pack spindle assembly kit includes the spindle, pulley, and a 1/2" x 142" belt, designed to replace the OEM assembly on Toro Timecutter zero-turn mowers with 50-inch decks. It’s the part that drives the mower blades, and the bundle is meant for routine replacement on high-use residential or light commercial mowers.

Fitment & Compatibility

Before buying, confirm your mower has a 50-inch deck and is one of these Toro Timecutter models: MX5000, MX5050, MX5060, SS5000, SS5060, or SW5000. The kit replaces OEM part numbers 139-3214, 117-7439, 121-0751, and 117-7267. Physically check that your existing spindle has a 1-inch diameter shaft and a 3-inch diameter pulley (the included pulley is 125-5575). The belt is 1/2-inch wide and 142 inches long—measure your old belt or deck routing to confirm. This kit is not compatible with 42-inch or 54-inch Timecutter decks.

Key Things to Know

• Quality vs. OEM: Aftermarket spindles may use slightly different bearings or seals. Most users report they last 1–2 seasons under moderate use, but OEM spindles can be more durable for heavy commercial cutting.
• Installation difficulty: Moderate—requires basic tools (socket set, wrench, possibly a puller for old spindles). Expect 30–60 minutes per spindle. The belt routing can be tricky; take a photo before removing the old belt.
• Common gotcha: The pulley bolt may be reverse-threaded on some Toro models. Check your deck’s manual before tightening to avoid stripping.
• Belt tension: The included belt is a standard fit, but if your deck uses a spring-loaded tensioner, ensure the belt is routed correctly and not twisted before engaging.

Should You Buy It

If you own one of the listed 50-inch Timecutter models and need a budget-friendly way to replace all three spindles and the belt at once, this kit is a solid value. It’s best for homeowners or light commercial users who want to avoid the higher cost of OEM parts and don’t mind a slightly shorter lifespan. Skip it if you need OEM durability for heavy daily use.