Mulch Cover Kit Compatible with 42-Inch Lawn Tractor Deck for John Deere Lawn Tractor Deck 100, D, L, and LA Series Mowers with Mounting Hardware - Replaces GY00115

What It Is

This mulch cover kit blocks the discharge chute on 42-inch John Deere lawn tractor decks, forcing grass clippings to recirculate for finer mulching. Designed for the 100, D, L, and LA series, it replaces OEM part GY00115 and includes mounting hardware.

Fitment & Compatibility

Before buying, confirm your deck is exactly 42 inches wide (measure blade tip to blade tip). This kit fits John Deere models like D100, D105, D110, D125, D130, D140, D150, D155, D160, D170, LA105, LA110, LA115, LA120, LA125, LA130, LA135, LA140, LA145, LA150, LA155, L100, L107, L108, L110, L111, L118, L120, L130. It will not fit 48-inch or 54-inch decks. The aftermarket kit replaces OEM GY00115 but may have slight fitment variation on older decks due to weld-nut alignment. Check that your deck has two pre-drilled holes on the discharge opening—some early models lack these.

Key Things to Know

• Installation difficulty: Easy (15-20 minutes). Requires a socket or wrench to bolt the cover onto the deck’s existing holes. No drilling needed if holes are present.
• Build quality: Mixed reviews—some users report the plastic cover cracking after a season of heavy use, especially in rocky or sandy soil. Metal OEM versions are more durable but cost 2-3x more.
• Mulching performance: Works best with a high-lift mulching blade (sold separately). Using standard blades may leave clumps in tall, wet grass.
• Common gotcha: The included hardware may rust quickly if stored outdoors. Apply anti-seize or replace with stainless bolts.

Should You Buy It

Buy this if you have a 42-inch John Deere 100/D/L/LA series and want an affordable way to convert to mulching without buying a new deck. Skip it if you need heavy-duty durability for frequent commercial use—look for the OEM metal kit instead.