SCITOO Electric Lawnmower, PTO Clutch Fit for Woods: 388771 / for Xtreme: X0105 / for Warner: 5218-170, 5218-226

What It Is

This is an aftermarket electric PTO (power take-off) clutch that engages and disengages the mower blades on zero-turn and lawn tractors. It’s designed as a direct replacement for specific models from Woods, Xtreme, and Warner.

Fitment & Compatibility

Before buying, verify your current clutch’s part number matches one of these: Woods 388771, Xtreme X0105, Warner 5218-170, or 5218-226. Measure the clutch’s outer diameter (roughly 4.5 inches) and shaft size (typically 1 inch with a 3/16-inch keyway). Check the electrical connector type—this unit uses two flat spade terminals. It’s an aftermarket part, not OEM, so double-check deck bolt pattern (three or four holes) and overall stack height (about 2.1 inches) against your original. Common on brands like Bad Boy, Hustler, and some Gravely models, but always cross-reference with your mower’s service manual.

Key Things to Know

• Quality is acceptable for the price – Most users report it works well for residential or light commercial use, but heavy-duty commercial mowers may wear it faster.
• Installation is moderate difficulty – Requires basic tools (wrenches, multimeter) and about 30-60 minutes. You’ll need to remove the belt, pull the old clutch, and wire the new one. Check the air gap (0.010–0.015 inch) after mounting.
• Common gotcha: belt alignment – The pulley diameter must match your original. This clutch uses a 4.5-inch pulley, so measure yours. Misalignment causes belt squeal or premature wear.
• Wiring polarity doesn’t matter – The clutch is non-polarized, so you can connect the two wires either way to the harness. Use heat-shrink connectors to avoid shorts.

Should You Buy It

Buy this if you need a budget-friendly replacement for a residential zero-turn or lawn tractor with one of the listed part numbers, and you’re comfortable with a DIY install. Skip it for heavy commercial use or if you need an exact OEM match—spend more for a factory Warner or Ogura unit.