SCITOO Yellow 39"-62.5" PTO Shaft, 1-3/8" PTO Drive Shaft 6 Splines Both Ends PTO Driveline Shaft, Series 4 PTO Shaft without Slip Clutch Fit For Bush Hog, Finish Mower, Tractor

What It Is

This is a Series 4 PTO (Power Take-Off) driveline shaft designed to transfer engine power from a tractor to a rear-mounted implement like a brush hog, finish mower, or rotary cutter. It comes with 1-3/8" 6-spline connections on both ends and no slip clutch, meaning it’s a direct replacement for many standard PTO shafts on compact tractors and midsize implements.

Fitment & Compatibility

Before buying, confirm these measurements:

• Spline size: Both ends are 1-3/8" diameter with 6 splines—common on Category 1 and some Category 2 tractors (e.g., John Deere, Kubota, Ford, Massey Ferguson). Check your tractor’s PTO stub and implement input shaft; if either is 1-1/8" or 21-spline, this won’t fit.
• Length range: Collapsed length is 39", extended length is 62.5". Measure from your tractor’s PTO output to the implement’s gearbox input with the implement raised and lowered. You need at least 2" of overlap when fully collapsed and no more than 1" of extension when fully extended.
• No slip clutch: This shaft relies on the implement’s own shear bolt or slip clutch for overload protection. If your implement has no built-in protection, you’ll need to add one or risk driveline damage.
• Series 4 rating: Suitable for implements up to about 40 HP at 540 RPM. For heavier loads (60+ HP), step up to a Series 5 or 6 shaft.

Key Things to Know

• Quality: SCITOO is a budget brand. The shaft is functional for light-to-moderate use but may have less durable plastic guards and thinner tubing than premium brands (e.g., Weasler, Omni). Expect it to work for hobby farm or homeowner use, not daily commercial duty.
• Installation: Requires basic tools (wrenches, snap ring pliers). The shaft telescopes via spring-loaded pin or push-button lock—make sure the locking mechanism engages fully on both halves. No cutting or welding needed if your distance fits the 39"-62.5" range.
• Common gotcha: The yellow paint can chip quickly, and the plastic shield may crack if exposed to sun for years. Grease the splines and telescoping tube at assembly—shafts often arrive dry. Also, verify that the safety chain or guard clips are compatible with your implement’s mounting points.
• No slip clutch: If your mower has a heavy blade or you hit stumps, the lack of a slip clutch means the tractor’s PTO or implement gearbox takes the shock. Consider adding an aftermarket slip clutch if you mow rough terrain.

Should You Buy It

Buy this if you need a budget-friendly, direct-replacement PTO shaft for a compact tractor and a moderate-duty rotary cutter or finish mower, and your tractor and implement both use 1-3/8" 6-spline connections with a working length between 39" and 62.5". Skip it if you need a slip clutch, run high-horsepower equipment, or require heavy-duty commercial reliability.