(1) V Belt Idler Pulley Fits Murray 25" 30" 36" Riding Mowers 20613 420613MA 091178 1/2" X 3" (7127)

What It Is

This is a V-belt idler pulley designed for Murray riding mowers with 25", 30", or 36" cutting decks. It keeps tension on the mower deck drive belt, preventing slippage and ensuring consistent blade engagement.

Fitment & Compatibility

Before buying, verify these three things:

• Deck size: Fits Murray 25", 30", and 36" decks only. Check your deck measurement (not the mower model number) to confirm.
• OEM cross-reference: Replaces OEM part numbers 20613, 420613MA, and 091178. If your original pulley has one of these stamped on it, this is a direct swap.
• Physical dimensions: The pulley has a 1/2" bore and a 3" outer diameter. Measure your old pulley’s bore and OD to confirm fit—if either differs, it won’t work.
• Brand: Designed for Murray, but may fit some MTD or Craftsman models with the same deck size and pulley specs. Always match bore/OD first.

Key Things to Know

• Quality: All-metal construction with a sealed bearing. Should last multiple seasons under normal use, but check for smooth spin before installing.
• Installation difficulty: Easy—typically one bolt holding the old pulley. You’ll need a socket wrench and possibly a puller if rusted. No special tools.
• Common gotcha: The pulley is flat on one side and slightly crowned on the other. Install with the crowned side facing the belt (away from the deck) to prevent belt walking.
• Belt size note: Works with 1/2" wide V-belts. If your belt is 3/8" or 5/8", this pulley won’t align properly.

Should You Buy It

Yes, if you have a Murray riding mower with a 25", 30", or 36" deck and need a direct replacement for a worn or seized idler pulley. It’s cheap, easy to install, and matches the OEM specs. Skip it if your pulley bore or OD doesn’t match, or if you need a pulley for a different brand without checking deck compatibility first.