2 Pack 139-3214 Spindle Assembly with 125-5574 Pulley 1/2x114 Belt Replaces Toro 139-3214, 117-7439, 121-0751, 117-7267 for Toro Timecutter 42" MX4250, SS4200, SS4225, SS4235, SW4200 Mowers

What It Is

This is a 2-pack replacement spindle assembly kit for Toro Timecutter zero-turn mowers, including the required 125-5574 pulley and a 1/2" x 114" drive belt. It’s designed to restore cutting deck blade rotation on 42" decks when spindles wear out or fail.

Fitment & Compatibility

Before buying, confirm your mower model and deck size. This kit fits Toro Timecutter 42" models: MX4250, SS4200, SS4225, SS4235, and SW4200. It replaces OEM part numbers 139-3214, 117-7439, 121-0751, and 117-7267. Measure your existing spindle shaft diameter (must be 1/2") and pulley bolt pattern (typically 3-bolt, 4.5" center-to-center). The belt is 1/2" wide and 114" long—verify your current belt length matches. Do not assume fit for non-Toro decks or different deck sizes.

Key Things to Know

• Quality vs OEM: These are aftermarket spindles. They’re generally reliable for residential use, but OEM spindles may last longer under heavy commercial use.
• Installation difficulty: Moderate. You’ll need a socket set, jack or blocks to lift the deck, and a pry bar to remove the old pulley. Plan 1–2 hours per spindle.
• Common gotcha: The included pulley may not perfectly match the original’s bearing preload. Check for wobble after install—tighten to manufacturer torque specs (typically 35–45 ft-lbs).
• Belt note: The 1/2" x 114" belt is a standard size, but double-check routing diagram for your specific model. Replacing the belt at the same time prevents premature spindle wear.

Should You Buy It

If you own one of the listed Toro Timecutter 42" models and need a cost-effective spindle replacement for light-to-medium residential use, this kit is a solid value. Skip it if you run a commercial operation or need exact OEM tolerances—buy genuine Toro spindles instead.