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Mulching plug assembly

Rear Mulch Door

Mulching plug

Plug-discharge, rear

Mulch plug asm

Plug-chute

Door.asm.mulch.21.rwgd
Lawn Boy mowers excel at mulching and bagging, but the mulch plug and deflector chute must work together to control clipping discharge and mulching efficiency. A worn or damaged mulch plug allows clippings to escape uncontrolled, while a bent deflector chute reduces cutting performance and creates uneven lawn appearance. Repair Clinic supplies genuine OEM Lawn Boy replacement parts that restore precise airflow control inside your mower deck.
Both parts wear from repeated engagement and exposure to wet grass. Replacing them together ensures optimal mulching action and prevents deck damage from clipping backlog.
Find the exact mulch plug and chute for your machine using our Lawn Boy lawn mower mulch plug parts tool — search by model number for help ensure fit.
The mulch plug blocks the discharge opening entirely, forcing clippings back into the blade chamber for fine chopping. The deflector chute redirects clippings downward for bagging. Most Lawn Boy decks use an internal baffle (the plug) and an external metal or plastic chute that you manually position or cable-control. Both must seal properly for the system to work.
Signs include clippings escaping from the sides of the deck during mulch mode, uneven mulching (some areas finely chopped, others chunky), or visible cracks in the plug material. If you see daylight between the plug and deck opening, or if the plug won't seat flush, replacement is necessary to restore mulching performance.
Minor bends can sometimes be straightened carefully, but dents, cracks, and separation from the deck usually require replacement. Bent chutes disrupt airflow and cause clippings to scatter unevenly. OEM Lawn Boy chutes are engineered to your mower's deck shape, so genuine parts help ensure proper clipping direction and volume control.
Check the frame decal (typically on the handle or undercarriage) for your model and serial numbers. Older Lawn Boy units have this information stamped directly into the metal chassis. Always reference both numbers when ordering mulch plugs and chutes to ensure deck compatibility.


Keep your Lawn Boy Lawn Mower in top condition with genuine OEM mulch plug replacement parts from Repair Clinic. Mulch plugs are key to ensure efficient grass mulching and keep your lawn looking its best. Use our model number lookup to find the exact mulch plug part for your Lawn Boy mower. Enjoy the convenience of same-day shipping, No-Hassle 365-Day Returns, and our Price Match Guarantee. For additional help, visit our Lawn Mower Repair Help page or browse our full inventory of Lawn Boy Lawn Mower Parts.
On a Lawn Boy mower, start with the identification decal on the handle or undercarriage, then check the frame near the blade deck if it is not there. Older machines may have the model information stamped directly into the metal chassis, while some labels appear on the engine housing. Look for a model number, not just the serial number, and record the complete sequence before searching. Type it into our model number lookup and the catalog narrows to parts made for your unit. This filters the full Lawn Boy lawn mower parts selection, including mulch plugs, chutes, and other associated parts, so you can match the mower quickly and avoid ordering parts that do not fit.

Solid diagnostic work is what makes a Lawn Boy Lawn Mower repair go quickly, and Repair Clinic's online library was built for exactly that. Symptom articles, part testing videos, wiring diagrams, and step-by-step written guides give owners and technicians the reference material to isolate the failed part. Look up your model number to match the right OEM part, then follow the installation video.

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