Mulch Cover GY00115 Compatible with John Deere LA100, L100, 100, D Series 42 inch Mower Deck

What It Is

This is a replacement mulch cover (GY00115) for John Deere LA100, L100, 100, and D-series tractors with a 42-inch mower deck. It blocks the side discharge chute so grass clippings recirculate under the deck for finer mulching.

Fitment & Compatibility

• Deck size: Only fits 42-inch John Deere stamped steel decks (models with a 42” cutting width). Measure deck width edge-to-edge to confirm.
• Model check: Compatible with LA100, L100, 100, D100, D105, D110, D120, D125, D130, D140, D155, D160, D170, and similar D-series tractors. Also fits some LX and X-series with 42” decks—verify your deck model number (stamped on top or side).
• OEM vs aftermarket: This is a direct replacement for John Deere part GY00115. Aftermarket version may have slightly thinner plastic or less rigid mounting tabs compared to OEM—check for tight fit before final tightening.
• What to measure: Deck width (42”), discharge opening width (approx. 8.5”), and mounting hole spacing (two holes, 4” apart center-to-center). If your deck has a different discharge shape, it won’t seal.

Key Things to Know

• Build quality: Plastic is lightweight but generally durable for residential use. Avoid hitting rocks or stumps—cracks can form at mounting points.
• Installation: Tools needed: 10mm socket or wrench. Remove two bolts holding the discharge chute, position cover, reinstall bolts. Takes 5–10 minutes.
• Common gotcha: The cover may not seal flush if your deck has rust or debris around the discharge opening. Clean area and check for bent tabs before mounting.
• Mulching performance: Works best with sharp blades and dry grass. Wet or tall grass will clog the deck faster than a dedicated mulching kit (which includes a baffle).

Should You Buy It

If you have a John Deere 42” deck and want to convert from side-discharge to mulching for a cleaner lawn, this is a budget-friendly option. It’s ideal for light residential use on small to medium lawns. For heavy-duty mulching or commercial use, invest in a full mulching kit with a baffle for better cutting performance.