0340169798 20" High Lift Blade for LM2000-S, LM2020 & LM2020SP 20" Lawn Mowers

What It Is

This is a 20-inch high-lift replacement blade designed for gas-powered 20-inch walk-behind mowers, specifically the LM2000-S, LM2020, and LM2020SP models. The high-lift profile increases airflow under the deck, improving grass clipping lift and discharge, making it ideal for thick or tall grass.

Fitment & Compatibility

Before buying, confirm your mower deck size is exactly 20 inches—measure the blade span, not the deck housing. This blade is an aftermarket part, not OEM, but is engineered to replace the original blade on the listed models. Check the center hole diameter (typically 1 inch) and the blade thickness (usually 0.125 inches) to ensure a match. Also verify the blade’s offset or “dish” matches your deck’s design; a flat or low-lift blade will not interchange properly. Avoid assuming it fits other 20-inch mowers—stick to the LM2000-S, LM2020, or LM2020SP.

Key Things to Know

• Installation difficulty: Easy—requires only a socket wrench and blade removal tool. Always disconnect the spark plug wire first.
• Quality: High-lift blades wear faster than standard blades due to increased air resistance, but they deliver superior cutting and bagging performance.
• Common gotcha: High-lift blades can cause the mower to “walk” or pull harder on slopes—use extra caution on uneven terrain.
• Balance check: After installation, test blade balance with a simple balancer or nail-in-wall method to avoid vibration and deck damage.

Should You Buy It

Buy this blade if you regularly mow thick, damp, or tall grass and want a cleaner cut with better bagging or side-discharge performance. Avoid it if you prefer a standard blade for lighter lawns or want to minimize engine load and wear.