The ROP Shop Electric PTO Clutch for John Deere LA140, S140, S160, S170 and S180 Lawn Mower

What It Is

The ROP Shop Electric PTO Clutch engages and disengages the mower blades on your John Deere LA140, S140, S160, S170, or S180 lawn tractor. It replaces a failed OEM clutch that slips, won’t engage, or makes grinding noises.

Fitment & Compatibility

Before buying, confirm three things:

• Exact model: Fits John Deere LA140, S140, S160, S170, and S180—but verify your tractor’s model number on the frame tag (not just the deck).
• Deck size: Works with 42-inch and 48-inch decks (common on these models). Does not fit 54-inch decks or X-series tractors.
• OEM replacement: Directly replaces John Deere part numbers GY20793, GY21104, and GY20505. Measure your old clutch’s shaft diameter (typically 1 inch) and bolt pattern (3-bolt, 4.5-inch hole circle) to match.
• Voltage: 12V DC only. Do not use on 24V systems.

Key Things to Know

• Quality vs OEM: ROP is an aftermarket brand. Build quality is acceptable for residential use, but may not last as long as a genuine John Deere clutch under heavy or commercial use.
• Installation difficulty: Moderate. You’ll need basic hand tools (socket set, torque wrench) and about 1–2 hours. The clutch sits under the engine, accessible from below.
• Common gotchas:
  • Disconnect the battery before starting.
  • The air gap between clutch and pulley must be set to 0.010–0.015 inches (use a feeler gauge). Too tight or too loose will cause slipping or failure.
  • Torque the center bolt to 35–45 ft-lbs. Over-tightening warps the clutch.

Should You Buy It

If you need a budget-friendly replacement for a worn PTO clutch on a residential John Deere LA or S-series mower, this ROP clutch is a solid value at $157. It fits correctly and works—but expect a shorter lifespan than OEM, especially if you mow thick, wet grass or have a large lawn. Skip it for commercial use or if you want maximum durability.