139-3214 Spindle Assembly Replaces 121-0751 117-7439 117-7267 117-7268 for Toro Timecutter 42" 50" SS5000 SS4225 SS4235 MX5060 MX5000 MX4250 MX5050 SS5060 SS4260 SS4200 SW5000 MX5025 Mowers

What It Is

This is a replacement spindle assembly for select Toro Timecutter zero-turn mowers, designed to mount and drive the mower deck blades. It’s a direct-fit aftermarket part that replaces OEM part numbers 139-3214, 121-0751, 117-7439, 117-7267, and 117-7268, making it suitable for 42” and 50” decks on several Timecutter and MX series models.

Fitment & Compatibility

Before buying, verify your mower’s model number and deck size. This spindle fits:

• Toro Timecutter models: SS5000, SS4225, SS4235, SS5060, SS4260, SS4200, SW5000
• Toro MX models: MX5060, MX5000, MX4250, MX5050, MX5025
• Deck sizes: 42” and 50” (not for 54” or 60” decks) Check your current spindle’s mounting hole pattern (typically 4-bolt) and shaft diameter (usually 5/8”). This is an aftermarket part, not OEM Toro, but is listed as a direct replacement. Measure your old spindle’s overall height and pulley bore size to ensure match—most use a 1/2” or 5/8” bore pulley. If your mower has a different deck or spindle design, this won’t fit.

Key Things to Know

• Quality: Aftermarket steel housing with sealed bearings; generally reliable for residential use, but may not match OEM durability under heavy commercial loads.
• Installation difficulty: Moderate. You’ll need basic tools (wrench set, socket, possibly a puller for the pulley). Expect 30-60 minutes per spindle.
• Common gotcha: The spindle may come without a pulley or mounting bolts—check your old spindle for reusable parts. Also, the shaft length or thread pitch can vary slightly; test-fit before fully tightening.
• Noise/vibration: Some users report minor vibration if the spindle isn’t perfectly aligned or if bearings are not pre-greased. Apply light grease to the shaft before assembly.

Should You Buy It

If you own one of the listed Toro Timecutter or MX mowers and need a budget-friendly spindle for a 42” or 50” deck, this is a solid choice for DIY repairs. It’s not built for heavy commercial use, but for residential mowing and occasional fixes, the price and rating make it a practical alternative to OEM parts. Just double-check your deck size and spindle measurements before ordering.