8TEN Deck Belt for Toro 42 inch Time Cutter Z Z420 17-42Z 16-42Z Z530 Zero Turn Mower 106-2173

What It Is

This is a 42-inch deck drive belt (OEM replacement part 106-2173) for Toro TimeCutter Z zero-turn mowers. It transfers power from the engine pulley to the deck spindles so the blades spin at the correct speed for cutting.

Fitment & Compatibility

Double-check these specs before buying:

• Deck size: Must be a 42-inch cutting deck. This belt will not fit 44-, 50-, or 60-inch decks.
• Models confirmed: Toro TimeCutter Z420, Z4200, Z530, 17-42Z, and 16-42Z. Also fits some 42-inch Toro Z Master decks.
• OEM number: 106-2173 (this is the Toro factory part number). Aftermarket belts often list this as a cross-reference.
• Measurements: Belt is 1/2 inch wide by 93 inches long (outside circumference). Measure your old belt to confirm length—worn belts can stretch slightly.
• Check your mower’s serial number: Toro made running changes on some models. If your deck uses a different belt routing (some have an idler pulley change), this belt may not route correctly.

Key Things to Know

• Quality vs. OEM: This is an aftermarket belt at half the price of a Toro-branded belt. Expect slightly shorter lifespan (2-3 seasons vs. 3-4 seasons on OEM) but perfectly functional for residential use.
• Installation difficulty: Moderate. You’ll need to remove the deck or at least the belt cover, release the idler pulley tension, and route the belt around three spindles and the engine pulley. A belt routing diagram is usually printed on the deck top.
• Common gotcha: The belt can squeal if tension is too low. After installation, manually spin the blades—if the belt flops or slips, adjust the idler arm or check for a worn tensioner spring.
• Storage tip: If you use the mower infrequently, remove the belt tension over winter to prevent permanent set (flat spots) that cause vibration.

Should You Buy It

If you need a quick, affordable replacement for a residential Toro TimeCutter with a 42-inch deck and don’t mind replacing it a season sooner than OEM, this belt is a solid value. Not recommended for commercial use or if your mower sees heavy daily cutting—go with the genuine Toro belt for maximum durability.