Electric PTO Clutch Compatible with Exmark Lazer Z Toro Z Master Z500 Z557 Z560 Z588E Replacement Part Number 103-3246 103-4000 103-4057 103-5835 103-6579 109-7673 116-1611 5218-168 5218-202

What It Is

This electric PTO clutch engages and disengages the mower blades on select Exmark Lazer Z and Toro Z Master zero-turn mowers (Z500, Z557, Z560, Z588E models). It replaces OEM part numbers 103-3246, 103-4000, 103-4057, 103-5835, 103-6579, 109-7673, 116-1611, 5218-168, and 5218-202.

Fitment & Compatibility

Before buying, confirm your mower’s model and serial number range. This clutch fits:

• Exmark Lazer Z (with 60” or 72” decks, specific serial breaks)
• Toro Z Master Z500, Z557, Z560, Z588E (with 50”, 60”, or 72” decks)

Critical checks:

• Measure the clutch shaft diameter (must match your crank shaft – typically 1” or 1-1/8”)
• Verify the electrical connector type (2-pin flat or round)
• Check the mounting bolt pattern (3-bolt vs 4-bolt – this is a 3-bolt design)
• Confirm belt width (usually 1/2” or 5/8”) and pulley diameter (common: 4.5” or 5”)

If your mower uses a different bolt pattern or shaft size, this clutch won’t fit. Cross-reference your OEM part number with the list above.

Key Things to Know

• Quality: Aftermarket unit at a fraction of OEM price; most users report reliable performance, but some note slightly louder operation than OEM
• Installation difficulty: Moderate – requires basic mechanical skills, a socket set, and a puller for the old clutch. Expect 1–2 hours
• Common gotchas: The air gap between the clutch and rotor must be set to 0.010–0.015” using feeler gauges. Too tight = drag; too loose = no engagement
• Wiring caution: Reverse polarity can fry the coil instantly. Match wire colors (usually red/black) to your mower’s harness

Should You Buy It

Buy this if you need a direct, cost-effective replacement for a failed OEM clutch on a compatible Exmark or Toro zero-turn, and you’re comfortable with a straightforward DIY install. Skip it if you want a guaranteed quieter OEM feel or if your mower uses a 4-bolt pattern or non-standard shaft size.