Warner Electric PTO Clutch, Warner 5218-213, ea, 1

What It Is

The Warner Electric 5218-213 is an electric PTO (Power Take-Off) clutch that engages and disengages the mower blades on riding lawn mowers and zero-turn mowers. It’s a direct replacement for OEM clutches on select John Deere, Husqvarna, and other commercial/ residential models.

Fitment & Compatibility

Before purchasing, verify these specifics:

• OEM cross-reference: Replaces John Deere AM133048, AM136272, AM139143, and Husqvarna 587971101, 587971201. Confirm your machine’s OEM part number matches one of these.
• Physical measurements: The clutch has a 1-inch bore, 3.5-inch diameter rotor, and 4.5-inch overall height. Measure your existing clutch’s shaft diameter, bolt pattern (typically 3-bolt), and stack height to ensure fit.
• Voltage: Requires 12V DC electrical system. Check your mower’s battery and wiring harness for proper voltage and amperage (usually 5-7 amps).
• Deck size: Works with 42” to 60” decks, but verify belt routing and pulley size (typically 3.5” or 4.5”) to match your mower’s drive system.

Key Things to Know

• Quality: Warner is an OEM supplier for many brands; this clutch is built to factory specs, so it’s a reliable direct swap.
• Installation difficulty: Moderate. Requires basic mechanical skills, a socket set, and a torque wrench (tighten to 25-30 ft-lbs). You’ll need to remove the mower deck and possibly the belt.
• Common gotchas: The air gap (0.010-0.020 inches) must be set correctly after installation—too tight causes drag, too loose prevents engagement. Also, check the pulley bearing for play; if worn, replace it simultaneously.
• Wiring: Polarity matters—the clutch wire is typically grounded through the mounting bolts. Test with a multimeter before final assembly.

Should You Buy It

If you need a direct OEM-grade replacement for a John Deere or Husqvarna with a 1-inch shaft and 3-bolt pattern, this Warner clutch is a smart buy. It’s built to last, fits common commercial/residential decks, and the price is fair for the quality. Skip it if your mower uses a different bore size or bolt pattern, or if you’re on a tight budget—cheaper aftermarket options exist but may fail sooner.