131-3939-03 Mower Blade Compatible with Toro TimeCutter SS4200 4225 4250 Riding Mower with 42" Deck - High Lift Blade for Ex Mark Quest Series Zero Turn Mower, Replace 131-3939-03P, 2 Pack

What It Is

This is a high-lift replacement blade set (2-pack) designed for Toro TimeCutter and Ex Mark Quest zero-turn mowers with a 42-inch cutting deck. High-lift blades create stronger airflow for superior grass discharge and bagging performance, making them ideal for thick or wet grass conditions.

Fitment & Compatibility

Before buying, verify your mower deck size is exactly 42 inches—this blade will not fit 44" or 50" decks. Compatible with Toro TimeCutter models SS4200, SS4225, SS4250 and Ex Mark Quest series zero-turn mowers with a 42" fabricated deck. This is an aftermarket replacement for OEM part number 131-3939-03P. Measure your existing blade: overall length should be 18 inches, center hole diameter 1 inch, and blade thickness 0.25 inches. Check your spindle bolt pattern—these use a standard 5-point star center hole. Not compatible with stamped steel decks or older TimeCutter models (pre-2015).

Key Things to Know

• Installation difficulty: Moderate. You’ll need a torque wrench to tighten spindle bolts to 70-80 ft-lbs. Never use an impact gun—it can damage the spindle.
• Quality note: These are aftermarket blades, not OEM Toro. They work well but may require light balancing before installation. Use a blade balancer (under $10) to avoid vibration.
• Common gotcha: High-lift blades increase engine load and can cause scalping on uneven terrain. Lower your cutting height slightly and avoid mowing wet grass to prevent bogging.
• Durability: The 0.25-inch steel is adequate for residential use but may dull faster than OEM on sandy soil or frequent mowing. Sharpen every 10-15 hours.

Should You Buy It

If you own a Toro TimeCutter or Ex Mark Quest with a 42-inch deck and want better bagging or discharge performance without paying OEM prices, this is a solid value at $30.99 for two blades. It’s not for commercial use or mowers with smaller/larger decks. For casual residential mowing on typical lawns, it’s a reliable cost-saving choice.