Electric PTO Clutch for Husqvarna CZ3815, CZ42175, CZ4217 Poulan Pro PK20H42YT PD24PH42ST Snapper ELT1840RDFR ELT2240RD Replacement Part Number 179333, 180505, 421612, 532180505, 583389701

What It Is

This electric PTO (Power Take-Off) clutch engages and disengages the mower blade system on zero-turn and riding mowers. It’s designed for Husqvarna CZ3815, CZ42175, CZ4217, Poulan Pro PK20H42YT, PD24PH42ST, and Snapper ELT1840RDFR, ELT2240RD models.

Fitment & Compatibility

Before buying, verify these three things:

• Model number – Match your mower’s exact model (e.g., CZ3815, PK20H42YT). Cross-reference with OEM part numbers: 179333, 180505, 421612, 532180505, 583389701.
• Physical measurements – Measure the clutch’s outside diameter (typically 4.5–5 inches), shaft hole size (must match your engine crankshaft – common sizes are 1 inch or 1-1/8 inch), and bolt pattern (usually 2 or 3 bolts). The replacement must match these exactly.
• Electrical connection – Ensure the plug style matches your mower’s harness (2-pin flat or round). Some aftermarket versions include an adapter; check your original connector.

Key Things to Know

• Quality – This is an aftermarket replacement, not OEM Husqvarna. Expect similar performance but possibly shorter lifespan. Check reviews for coil durability.
• Installation difficulty – Moderate: you’ll need basic tools (wrenches, socket set, multimeter). The clutch bolts to the engine crankshaft; you may need a puller if the old one is seized.
• Common gotchas – The air gap (typically 0.010–0.015 inches) must be set after installation using a feeler gauge. Too tight or loose will cause slippage or no engagement. Also, check that the belt pulley is the same width as your original (usually 3/8 or 1/2 inch).
• Wiring – If your mower has a voltage spike protection diode, ensure the replacement clutch includes one or reuse your old one to prevent electrical damage.

Should You Buy It

If you need a budget-friendly replacement for a Husqvarna, Poulan Pro, or Snapper zero-turn or riding mower and are comfortable with moderate DIY installation (including setting the air gap), this is a solid option. Skip it if you want OEM reliability or have a non-standard shaft size/bolt pattern – verify measurements first to avoid returns.