Air Cleaner Cover 595660 Air Filter 799579 with 594281 Primer Bulb Compatible with 590581 08P502 08P602 09P602 09P702 Series Engines MTD Troy

What It Is

This is a 3-piece air filter service kit (cover, filter, primer bulb) for MTD and Troy-Bilt lawn mowers with 590581, 08P502, 08P602, 09P602, or 09P702 series engines. It replaces the air filter and primer bulb in one go, keeping dirt out of the carburetor and ensuring reliable starting.

Fitment & Compatibility

• Engine series: Fits MTD 590581, 08P502, 08P602, 09P602, 09P702 engines (found on many push mowers and tractors from the 2000s–2010s).
• Check your model: Look for a stamped engine model number (e.g., “09P702”) near the spark plug or on the engine shroud. This kit will not fit engines outside these series.
• OEM equivalent: Replaces OEM part numbers 595660 (cover), 799579 (filter), and 594281 (primer bulb). Aftermarket, not OEM.
• Measurements: Cover is roughly 4” x 3”; filter is about 2.5” round. If your current cover or filter is significantly larger or smaller, it won’t fit.
• Deck size irrelevant: This part fits the engine, not the deck. Engine series is the only compatibility factor.

Key Things to Know

• Quality: Users report a snug fit and good seal. The primer bulb is flexible and durable, but aftermarket rubber may degrade faster than OEM in extreme heat.
• Installation: Easy—remove the old cover, swap the filter, press in the new primer bulb (align the tab), and snap the cover back on. No tools needed.
• Common gotcha: The primer bulb’s stem must be fully seated into the carburetor’s grommet; a loose bulb will cause hard starting. Check that the cover’s tabs click into place securely.
• Filter direction: The foam side of the filter should face outward (toward the cover), not toward the carburetor. Installing it backward restricts airflow.

Should You Buy It

If you have one of the listed MTD/Troy-Bilt engine series and your old air filter is dirty or the primer bulb is cracked/stiff, this $7 kit is a solid value. It’s not OEM, but the fit and function match well for routine maintenance. Skip it if you need a genuine MTD part for warranty or if your engine model isn’t in the list—then buy the specific OEM pieces.