138-7265 Extension Spring, Compatible with Toro TimeCutter 42 in 74682 74684 74686 75742 75746, Also Compatible with Exmark Quest QZE702GEM42200 QZE725GKC42200

What It Is

The 138-7265 extension spring is a replacement tension spring for the deck belt system on select Toro TimeCutter and Exmark Quest zero-turn mowers. It provides the necessary tension to keep the mower deck drive belt properly engaged during operation.

Fitment & Compatibility

Before buying, confirm your mower model matches exactly. This spring fits Toro TimeCutter models 74682, 74684, 74686, 75742, and 75746 (all 42-inch decks). It also fits Exmark Quest models QZE702GEM42200 and QZE725GKC42200. Measure the original spring’s length (uncompressed) and hook-end diameter—this spring is roughly 3-4 inches long with small closed loops. It is an OEM-equivalent part, not a Toro genuine part, so verify your deck belt routing requires this specific spring (some decks use two springs; check your parts diagram).

Key Things to Know

• Quality: This is a non-OEM replacement; reviews are limited (only 1 rating). The steel construction should be adequate for normal residential use, but inspect the spring for consistent coil spacing and no burrs before installation.
• Installation difficulty: Easy—no tools required beyond a pair of pliers to hook the spring into its mounting holes. Takes about 5 minutes.
• Common gotcha: Make sure you’re replacing the correct spring. The deck belt system often has a primary spring and a secondary spring; this part only covers one type. Check your deck diagram to confirm it’s the one that connects the belt tensioner arm to the deck frame.
• Noise: A worn spring can cause belt slippage and squealing—if you hear that, this spring is likely the fix.

Should You Buy It

If you own one of the listed Toro or Exmark 42-inch zero-turn mowers and your deck belt tension spring is stretched, broken, or missing, this is a cheap, easy fix. For light residential use, it’s a solid value at $15.99. If you need a guaranteed OEM fit or are a commercial operator, consider a genuine Toro part instead.