John Deere Original Equipment Model LT133 Maintenance Kit + Mulching Blades for 38"

What It Is

This John Deere Original Equipment LT133 Maintenance Kit + Mulching Blades is a bundled service package for 38-inch deck lawn tractors. It includes an oil filter, air filter, spark plug, fuel stabilizer, and two mulching blades, designed for a single-season tune-up plus blade replacement on compatible John Deere models.

Fitment & Compatibility

Deck size: Only fits 38-inch cutting decks. Measure your deck width or check your mower’s model plate—this kit will not work on 42-inch or 48-inch decks.
Models: Specifically for John Deere LT133, but also fits LT150, LT155, LT160, LT166, and LT170 with 38-inch decks. Check your owner’s manual or look for “38C” or “38-inch” in your mower’s deck code.
OEM vs aftermarket: This is John Deere genuine (OEM) kit. Aftermarket blades may fit but won’t match the mulching profile or balance.
Measurements: Blades are 13.5 inches long, 2.25 inches wide, with a 1-inch center hole and 0.5-inch offset. Verify your existing blade dimensions if unsure.

Key Things to Know

• Quality: OEM parts ensure exact fit, consistent sharpness, and proper balance—no filing or shimming needed. Mulching blades have a curved design that lifts clippings for finer cutting, so don’t use them for side-discharge or bagging without swapping.
• Installation difficulty: Moderate. You’ll need a socket set, torque wrench (blade bolts to 30-35 ft-lbs), and a blade removal tool or block of wood to lock the blade. The oil filter and spark plug are straightforward, but the air filter may require removing the engine cover.
• Common gotchas: The fuel stabilizer is a small bottle—add it to a full tank of fresh gas, not old fuel. The kit does not include oil (use SAE 30 or 10W-30). If your mower uses a different spark plug gap (typically 0.030 inch), double-check before installing.
• Cost vs separate purchase: Buying these parts individually costs roughly $20 more, so the kit saves money if you need everything at once.

Should You Buy It

Buy this if you own a compatible John Deere 38-inch deck model and want a single-box solution for a complete spring tune-up with mulching blades. It’s ideal for owners who prefer OEM reliability over aftermarket savings and don’t mind a moderate DIY install. Skip it if you need side-discharge or bagging blades, or if your mower has a different deck size.