525405001 HU46 46-Inch Mulch Kit - Compatible with Husqvarna Tractors, Fits Tractors and ZTR's with 46-inch Decks MK46 - with Mounting Hardware

What It Is

This 46-inch mulch kit (part #525405001, also labeled HU46/MK46) converts your Husqvarna tractor or ZTR with a 46-inch cutting deck from side-discharge or bagging to mulching. It uses a sealed baffle and specially shaped blades to recirculate clippings for finer cutting and natural lawn fertilization.

Fitment & Compatibility

• Deck size only: Fits any 46-inch deck on Husqvarna tractors and ZTRs (e.g., YTH, TS, GTH, Z series). Does NOT fit 42-inch, 48-inch, or 54-inch decks.
• Model check: Cross-reference your machine’s model number with Husqvarna’s official compatibility list. Confirmed for YTH18542, YTH22V46, TS142, TS242, Z242F, Z254, and many others.
• OEM vs aftermarket: This is an OEM Husqvarna kit, so fitment is guaranteed for Husqvarna, Poulan Pro, and Craftsman tractors with Husqvarna-built 46-inch decks. Not for John Deere, Cub Cadet, or MTD decks.
• Measurement check: Measure your deck width from blade tip to blade tip—must be exactly 46 inches. Also verify the deck’s mounting hole pattern (center-to-center distance of the two rear baffle bolts) is 4.5 inches.

Key Things to Know

• Installation: Moderate difficulty (30-60 minutes). Requires removing the deck, swapping blades (included), and bolting on the baffle. A torque wrench for blade bolts is recommended—spec is 70-80 ft-lbs.
• Blades included: Kit comes with three mulching blades (part #532429566). They are shorter and have more lift than standard blades—do not reuse old blades.
• Common gotcha: The mulch plug (baffle) may require trimming the deck’s discharge chute on some older models. Check for interference before final tightening.
• Performance note: Works best on dry, short grass (under 3 inches). Wet or tall grass will clog—you’ll need to slow down and overlap passes.

Should You Buy It

Buy it if you want to mulch-clip your lawn instead of bagging, and your Husqvarna (or compatible) has a 46-inch deck. It’s a solid OEM solution for the price, but skip it if you regularly cut wet or overgrown grass—side-discharge is better for those conditions.