Grasscool LT2000 LT1000 Mower Mulching 5 Star Blades Replace 422719 134149 for Craftsman 42 inch Zero Turn YS4500 42'' Deck Riding Lawn Tractor 532134149 138971

What It Is

This is a set of three mulching blades designed to replace OEM part numbers 422719, 134149, and 138971. They fit 42-inch cutting decks on Craftsman YS4500 and similar zero-turn mowers, as well as Grasscool LT2000/LT1000 models. The 5-star wing design lifts and re-cuts clippings for finer mulch.

Fitment & Compatibility

• Deck size: Only for 42-inch (107 cm) decks. Measure your deck width before ordering.
• Blade measurements: Each blade is 15.25 inches long, 2.5 inches wide, with a 1-inch center hole and 0.25-inch thick steel. Check your current blade length and hole size.
• OEM cross-references: Directly replaces Craftsman/MTD 422719, 134149, 138971, and 532134149. Also fits some Husqvarna, Poulan, and AYP decks using those numbers.
• Not universal: Will not fit 46-inch, 48-inch, or 54-inch decks. Verify your mower model uses a 3-blade spindle pattern.

Key Things to Know

• Installation: Easy bolt-on job with a socket wrench. Torque blade bolts to 70-80 ft-lbs. Lift mower or block deck safely before work.
• Mulching vs. bagging: These are dedicated mulching blades. They won’t bag or side-discharge well. If you swap between modes, keep your original blades.
• Sharpness edge: Many users report they arrive sharp but dull faster than OEM if used on tough grass or debris. Expect to sharpen after 10-15 hours of heavy use.
• Balance check: Weigh and balance each blade before installing. Unbalanced blades cause vibration and damage spindles.

Should You Buy It

Buy these if you own a Craftsman YS4500, Grasscool LT2000/LT1000, or any 42-inch mower using 15.25-inch blades with a 1-inch center hole, and you want a budget-friendly mulching upgrade. They’re well-reviewed for fine mulching on residential lawns but less durable than premium brands for commercial use. Skip them if you need bagging or side-discharge performance.