42" Deck Mulch Cover for John Deere X110 X120 D110 D120 L105 L107 LA100 LA105 S240 42-Inch Mower Decks, Replace for GY00115

What It Is

This is an aftermarket mulch cover for 42-inch John Deere mower decks. It replaces the OEM part GY00115 and blocks the side-discharge chute, forcing clippings to recirculate under the deck for finer mulching.

Fitment & Compatibility

Check deck size first. This cover fits only 42-inch (107 cm) stamped steel decks found on these models: John Deere X110, X120, D110, D120, L105, L107, LA100, LA105, and S240. It will not fit 48-inch or 54-inch decks. Verify your deck model number (stamped on the deck housing) before ordering. The aftermarket part replaces OEM GY00115, but fitment can vary slightly—some users report needing to enlarge mounting holes or use washers for a snug fit. Measure the chute opening width (approx. 6.5–7 inches) and the mounting bolt spacing (approx. 3.5 inches center-to-center) to confirm.

Key Things to Know

• Quality concerns. At $22.70 with a 3.0-star rating, this is a budget aftermarket part. Several reviews mention thin plastic that can crack or warp under heat or pressure. Check for sharp edges or burrs before installation.
• Installation difficulty. Simple bolt-on job (one or two bolts, no tools needed beyond a socket or wrench). Expect to loosen the chute deflector, slide the cover underneath, and re-tighten. Some users note the cover may rattle if not tightened firmly.
• Common gotcha. The cover may not seal perfectly against the deck. If clippings escape, you may need to add a foam gasket or trim the cover edges. Also, this cover is for mulching only—remove it for bagging or side-discharge.
• Durability warning. Under heavy use (tall grass, wet clippings), the cover can deform or break within a season. Consider a metal OEM cover (GY00115) if you mow frequently.

Should You Buy It

Buy this if you need a cheap, temporary mulch cover for light-duty mowing on a 42-inch John Deere and don’t mind potential fit adjustments or shorter lifespan. Skip it if you mow thick, wet grass often or want a long-term solution—invest in the OEM metal cover instead.