8TEN Electric PTO Clutch for John Deere Z710A Z720A Z910A Z920A ZTrak Pro Mower TCA21167 5218-271 TCA20604

What It Is

This is an aftermarket electric PTO (power take-off) clutch for zero-turn mowers, designed to engage and disengage the mower deck blades. It’s a direct replacement for John Deere ZTrak Pro models Z710A, Z720A, Z910A, and Z920A.

Fitment & Compatibility

Before buying, verify these three things:

• Model match: This clutch replaces OEM part numbers TCA21167, 5218-271, and TCA20604. It fits John Deere Z710A, Z720A, Z910A, and Z920A (both 54" and 60" deck versions). Not for other ZTrak models.
• Physical check: Measure the shaft diameter (typically 1.125") and bolt pattern (three 1/4-20 bolts on a roughly 3.5" circle). Compare with your old clutch to ensure it matches.
• Wire harness: The clutch uses a standard two-pin flat connector. Confirm your mower’s harness plug matches (most John Deere ZTrak Pro units do, but older or modified machines may differ).

Key Things to Know

• Aftermarket quality: At $119.95, this is significantly cheaper than OEM ($300+). Expect acceptable performance for homeowner/light commercial use, but may not last as long under heavy daily mowing.
• Installation difficulty: Moderate. You’ll need basic hand tools (socket set, torque wrench) and a puller tool to remove the old clutch from the crankshaft. The job takes 1–2 hours.
• Common gotchas:
  • The clutch may require a 0.010–0.015" air gap adjustment after installation (use feeler gauges).
  • If the mower has a brake pad on the old clutch, reuse it (this aftermarket unit may not include one).
  • Check the wiring connector orientation—some units have reversed polarity, which can blow a fuse if miswired.
• Warranty: Typically 1-year limited. No support from John Deere—deal with the seller directly for defects.

Should You Buy It

This is a solid budget option if you’re a homeowner or light commercial user replacing a failed PTO clutch on a ZTrak Pro. It won’t match OEM durability for heavy daily use, but for the price, it’s a practical fix that gets the job done. If you mow professionally 40+ hours a week, spend extra on an OEM clutch.