179333 Electric PTO Clutch for AYP Husqvarna 180505 532179333 532180505, 532421612 583389701,for Ferris 400S, Simplicity 2690782 2690783, CTX9500

What It Is

This is an electric PTO (power take-off) clutch that engages and disengages the mower blades via an electromagnetic coil. It’s designed for AYP/Husqvarna lawn tractors, Ferris 400S commercial zero-turns, and Simplicity models, typically used on 42"–54" decks.

Fitment & Compatibility

Before buying, verify these four things:

1. OEM cross-references – This clutch replaces Husqvarna/AYP part numbers 179333, 180505, 532179333, 532180505, 532421612, and 583389701. Also fits Simplicity 2690782, 2690783.
2. Machine brands – Confirmed for Husqvarna, AYP (American Yard Products), Ferris 400S, Simplicity, and some Craftsman/MTD models with the same PTO setup.
3. Physical measurements – Check your old clutch’s shaft diameter (typically 1" or 7/8"), bolt pattern (3-bolt or 4-bolt), and overall diameter (usually ~4.5"). This clutch uses a 1" shaft with a 3-bolt pattern.
4. Electrical check – Requires 12V DC, usually with a 2-wire connector. Measure your existing harness plug shape to ensure it matches (most are flat 2-pin).

Tip: If your deck is 48" or larger, confirm the clutch’s amp draw matches your tractor’s PTO switch and fuse rating (typically 15A).

Key Things to Know

• Quality vs OEM – This is an aftermarket replacement, not genuine Husqvarna. Reviews note it works well for the price, but some report slightly noisier engagement than OEM.
• Installation difficulty – Moderate. You’ll need a puller to remove the old clutch from the engine shaft, plus a torque wrench (specs: 35–45 ft-lbs for the center bolt). Expect 30–60 minutes.
• Common gotcha – The air gap between the clutch rotor and armature must be set to 0.010"–0.015" after installation. Use a feeler gauge; too tight or too loose causes slipping or failure.
• Wiring polarity – Most replacements are polarity-sensitive. If blades engage but won’t disengage, swap the two wires at the connector.

Should You Buy It

If your OEM clutch failed and you want a budget-friendly drop-in replacement for a Husqvarna, AYP, Ferris 400S, or Simplicity tractor, this is a solid choice. It’s not built as ruggedly as a genuine Husqvarna unit, but for residential use or light commercial mowing, it’ll save you $50–80. Avoid if you need a heavy-duty clutch for daily commercial zero-turn use.