Caltric GY00115 42" Deck Mulch Cover Compatible With John Deere

What It Is

The Caltric GY00115 is an aftermarket mulch cover designed for 42-inch John Deere lawn tractor decks. It replaces the OEM mulch plug to block the discharge chute, forcing grass clippings to recirculate and chop into fine mulch for a cleaner, fertilizer-free lawn.

Fitment & Compatibility

Before buying, confirm your mower has a 42-inch stamped steel deck (not fabricated) and that your model uses a side-discharge chute that accepts a plug. Caltric lists compatibility with John Deere models including L100, L110, L120, L130, LA100, LA110, LA120, LA130, LA140, LA150, and X300 series. However, measure your deck’s discharge opening width – the OEM plug is roughly 10.5 x 6 inches. If your deck has a different shape or size, this cover won’t seal properly. Also check that your mower’s OEM part number is AM107074, AM137074, or AM142074 – this Caltric cover is a direct replacement for those.

Key Things to Know

• Fit can be tight – some users report needing to trim or sand the edges for a snug seal against the deck. Test fit before final installation.
• Installation is simple – just remove the side-discharge chute, slide the mulch cover into the opening, and secure with the existing hardware (usually two bolts). No special tools needed.
• Aftermarket durability – Caltric uses a plastic composite similar to OEM, but it may be slightly less rigid. It’s fine for regular mulching but could crack if you hit a rock or curb.
• Check for clearance – some deck designs have a curved discharge opening; this flat cover may not contour perfectly, leaving a gap that reduces mulching efficiency.

Should You Buy It

If you already own a compatible 42-inch John Deere and want a budget-friendly way to switch from bagging or side-discharge to mulching, this Caltric cover does the job for about half the OEM price. It’s best for light-to-moderate mulching on flat lawns without heavy debris. For heavy-duty use or a perfect OEM fit, spend more on the genuine John Deere part.