John Deere OEM V-Belt X300 X304 X310 X320 X324 X340 X350 X370 X380 X384 X390 X394 X500 X520 M174506

What It Is

This is a genuine John Deere OEM V-belt (part M174506) that drives the mower deck blades on select X300, X500, and X300R Series lawn tractors. It’s the primary belt connecting the engine pulley to the deck spindles.

Fitment & Compatibility

Models that use M174506: X300, X304, X310, X320, X324, X340, X350, X370, X380, X384, X390, X394, X500, X520.
Deck sizes: Works with 42-inch, 48-inch, and 54-inch decks (verify your deck model—Accel Deep, Edge, or standard).
Check before buying:

• Confirm your tractor’s model and serial number (stamped under seat or in manual).
• Measure your old belt (length ~135.5 inches, width 1/2 inch).
• OEM vs aftermarket: This is OEM John Deere—fits exactly, no modifications needed.
• Do not use on X530, X534, X540, or X590 (those use a different belt).

Key Things to Know

• Quality: OEM belt is Kevlar-reinforced, lasts longer than most aftermarket belts (2–3 seasons with normal use).
• Installation: Moderate difficulty—requires removing the deck, routing belt around idlers and spindles. Use a belt diagram (often on deck or manual).
• Gotcha: The belt must be routed correctly around the spring-loaded idler pulley; wrong routing causes slipping or deck damage.
• Compatibility note: If your X300 has a 42-inch deck, double-check your deck model—some early 42-inch decks use a different belt.

Should You Buy It

If you own one of the listed X300 or X500 Series tractors and need a reliable, long-lasting deck belt, this OEM part is the right choice. It’s more expensive than generic belts but avoids fitment headaches and premature wear. Skip it if you have a different model (e.g., X530) or if your deck belt is a different size.