PTO Overrun Clutch, Quick Release Tractor PTO Clutch Over Running Coupler 6 Spline 1 3/8", Tractor Shaft Link Quick Connect Slip Coupler for Ford John Deere Massey Ferguson Holland Kubota

What It Is

A PTO overrun clutch that lets your tractor’s implement (like a mower deck or brush hog) keep spinning freely when you disengage the PTO, preventing driveline damage. Uses a 1 3/8”, 6-spline female coupler on both ends—quick-release, no tools needed to attach or detach.

Fitment & Compatibility

• Spline size: Must match your tractor’s PTO shaft—1 3/8” diameter, 6 spline. Common on Ford, John Deere, Massey Ferguson, New Holland, Kubota (compact and subcompact models).
• Check your implement’s input shaft: Same 1 3/8”, 6-spline required. If your implement uses a different size (e.g., 1 1/8” or 21-spline), this won’t fit.
• Deck size/model: Not deck-specific—works with any PTO-driven attachment (mowers, tillers, snow blowers) that uses the standard 6-spline coupler.
• OEM vs aftermarket: Aftermarket replacement for OEM parts like Ford/New Holland 83918537, John Deere GY20589, Massey Ferguson 183140M1. Verify your tractor’s PTO output shaft is the quick-release style (some older models use a pin or bolt-on yoke).
• Measurement check: Measure your PTO shaft’s outer diameter and spline count before ordering. This coupler is 3.5” long, 2.5” diameter—fits most compact tractors.

Key Things to Know

• No tools needed: Quick-release design—pull back the collar to attach/detach. Saves time switching implements.
• Installation difficulty: Easy—slides directly onto your tractor’s PTO shaft. No modifications required if splines match.
• Quality concern: Some users report slight play (wobble) on older worn shafts. It’s normal for aftermarket couplers; check for excessive slop before heavy use.
• Common gotcha: Won’t work on tractors with a 1 1/8” or 21-spline PTO output. Also not compatible with implements that have a non-standard coupler (e.g., some European or vintage models).

Should You Buy It

Buy this if you have a compact or subcompact tractor with a standard 1 3/8”, 6-spline PTO and want a quick-connect overrun clutch for mowing or light tillage. Ideal for owners of Ford, John Deere, Massey Ferguson, New Holland, or Kubota models who need to protect their driveline from implement coast-down shock. Skip it if your tractor or implement uses a different spline size or a bolt-on yoke.