SCITOO Black 43"-71" PTO Shaft, 1-3/8" PTO Drive Shaft 6 Splines End Round End 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 driveline shaft (1-3/8" diameter, 6-spline ends) designed to transfer power from a tractor’s rear PTO to implements like bush hogs, finish mowers, or rotary cutters. It replaces worn or broken OEM shafts on Category 1 and 2 tractors, with a telescoping length of 43 to 71 inches to fit varying hitch-to-implement distances.

Fitment & Compatibility

Before buying, check three things:

• Spline size: Must be 1-3/8" diameter, 6-spline female ends on both tractor and implement input. This is standard for most compact and mid-size tractors (e.g., Kubota, John Deere, Massey Ferguson, New Holland) but not for larger Category 3 (1-3/4") or smaller Category 0 (1-1/8") shafts.
• Overall length: Measure from the tractor PTO stub to the implement gearbox input with the implement fully raised (shortest distance) and fully lowered (longest). The shaft’s collapsed length (43") should be at least 1" shorter than your shortest measurement, and its extended length (71") at least 1" longer than your longest—otherwise the shaft will bottom out or pull apart.
• Implement type: Works for bush hogs, finish mowers, rotary cutters, and other Category 1/2 540 RPM implements. Not for slip-clutch or shear-pin protected gearboxes—this shaft has no built-in overload protection, so the implement’s own clutch/pin must handle shock loads.

Key Things to Know

• No slip clutch: This is a direct-drive shaft. If your implement lacks its own overload protection, sudden jams can damage the gearbox or tractor PTO. Consider adding a separate slip clutch or shear-pin yoke if needed.
• Installation: Requires basic tools (wrenches, grease). The telescoping tubes slide together with a locking pin; ensure the pin engages fully. Grease the splines and U-joints before first use.
• Build quality: SCITOO’s 4.5-star rating (106 reviews) indicates solid reliability for the price. Some users report tight initial fit on older implements—light filing on the spline ends may be needed.
• Length adjustment: You may need to cut the shaft to final length if your implement’s collapsed measurement is less than 43". Measure twice before cutting.

Should You Buy It

Buy this if you need a budget-friendly, direct-fit replacement for a worn 1-3/8" 6-spline PTO shaft on a Category 1 or 2 tractor and your implement already has its own overload protection (slip clutch or shear pin). Skip it if you require a slip-clutch built-in, or if your tractor/implement uses non-standard spline sizes.