3126391001 Grass Trail Shield for LM2100, LM2102SP & LM2140SP 21" Lawnmowers

What It Is

The Grass 3126391001 is a replacement grass trail shield (also called a rear discharge deflector) designed to direct clippings downward behind the mower, preventing debris from spraying out the back. It fits select 21” walk-behind mowers from the LM2100, LM2102SP, and LM2140SP series.

Fitment & Compatibility

• Deck size: 21 inches (must match your mower deck width).
• Models confirmed: LM2100, LM2102SP, LM2140SP (check your model number on the mower’s ID tag under the seat or on the deck).
• OEM equivalent: This is an aftermarket part, not OEM. It’s a direct replacement for the original factory shield on these models.
• Mounting: Uses two bolts and nuts (usually 5/16” or 1/4”) at the rear of the deck. Measure the spacing between existing mounting holes (approx. 6–7 inches apart) to confirm fit.
• What to check before buying: Verify your mower’s model number (not just series) and that the shield’s width (roughly 20–21 inches) matches your deck’s rear opening. If your original has a spring return, ensure this replacement includes a similar spring or you reuse your old one.

Key Things to Know

• Build quality: Sturdy plastic with a metal hinge pin; holds up well to normal use but may crack if hit hard against curbs or rocks.
• Installation: Easy—remove the old shield, align the new one over the mounting holes, insert bolts, and tighten. No special tools needed; a socket or wrench works.
• Common gotcha: The spring tension can be tricky to reattach if your mower uses a torsion spring. Take a photo of the original setup before removing it.
• Fit note: Some users report the shield sits slightly higher than OEM, reducing clearance under low-decks. If you mow very tall grass, it may drag slightly.

Should You Buy It

If your original grass shield is cracked, missing, or sagging, this is a solid, cost-effective replacement. It’s a perfect match for the listed LM models, installs in minutes, and restores proper clipping deflection. Skip it if you have a different deck size or model series—verify fitment first to avoid returns.