31.5"-41" PTO Shaft, 1-3/8" PTO Drive Shaft, 6 Spline Both Ends PTO Driveline Shaft, Series 4 Tractor PTO Shaft w/Slip Clutch for Bush Hog, Finish Mower Review

Overview

This isn’t a lawn mower itself—it’s the critical driveline component that connects your tractor’s power take-off (PTO) to a Bush Hog, finish mower, or other attachment. The 31.5"-41" PTO Shaft from PTO is a Series 4 driveline with a 1-3/8", 6-spline connection on both ends, plus a built-in slip clutch. It’s designed for tractor owners who need a reliable, medium-duty replacement or upgrade shaft for mowing, tilling, or light brush cutting.

Who Should Buy This

Tractor owners replacing a worn or broken shaft on a Bush Hog or finish mower – If your current PTO shaft has stripped splines, a bent tube, or a failed shear pin, this is a straightforward replacement that fits most standard Category 1 and 2 tractors.

Small-to-mid-acreage property owners with a 25-50 HP tractor – This Series 4 shaft is ideal for compact utility tractors used for finish mowing, light brush hogging, or rotary tilling. It’s not built for heavy commercial abuse but handles weekend property maintenance with ease.

DIY mechanics who want a slip clutch without the premium price – Many budget shafts use shear pins or sheer bolts, which snap at the worst time. This model includes a slip clutch that protects your gearbox from sudden shock loads—a feature usually found on $200+ shafts.

Farmers needing a spare driveline for field repairs – At $130, it’s affordable enough to keep in the shed as a backup. If a shaft fails mid-season, you’re not waiting days for a dealer to order one.

Key Features Breakdown

31.5" to 41" Collapsed-to-Extended Length – This range fits most compact tractors and implements. The telescoping design adjusts as your implement raises and lowers, preventing binding. Measure from your tractor’s PTO stub to the implement’s gearbox input—if it falls within this range, you’re good.

1-3/8", 6-Spline Connection (Both Ends) – This is the standard for North American Category 1 and 2 tractors (most John Deere, Kubota, New Holland, etc.). No adapters needed. The splines are machined cleanly—no burrs or slop reported by users.

Series 4 Rating – Series 4 means this shaft handles roughly 40-50 HP at 540 RPM. That’s enough for finish mowers up to 6-7 feet or light brush hogs. Don’t try it on a 100 HP tractor with a heavy-duty rotary cutter—you’ll snap the tubes.

Integrated Slip Clutch – This is the standout feature. Unlike shear pins that require you to stop and replace a bolt, the slip clutch disengages when the load spikes (hitting a rock or stump). It resets automatically, saving your gearbox and PTO from damage.

Standard Yoke with Locking Pin – The yokes use a spring-loaded locking pin to attach to your tractor and implement. It’s quick to connect and disconnect, though some users report the pins can be stiff initially.

Pros

1. Slip clutch at this price point is rare – Most shafts under $150 use shear pins. The slip clutch alone justifies the cost if you mow in rocky or debris-prone areas.

2. Solid build for medium-duty use – The tubing is thick enough to resist twisting under normal loads. No wobble or vibration reported by owners on 30-50 HP tractors.

3. Easy installation – Comes pre-greased and assembled. Slide it on, lock the pins, and adjust the length by loosening a bolt. Most users have it fitted in under 15 minutes.

4. Compatible with common implements – Works with Bush Hog, Land Pride, Woods, and most Chinese-made finish mowers and rotary cutters. The 6-spline, 1-3/8" ends fit the vast majority of compact tractors.

5. Smooth telescoping action – The inner and outer tubes slide freely without binding, even when the implement is at full lift height. No need to grease more than once a season.

6. Good value for the money – Comparable shafts from major brands run $180-$250. You’re saving 30-40% without sacrificing essential features.

Cons

1. Limited length range – 31.5" collapsed to 41" extended. If your tractor-implement combo needs a shorter or longer shaft, this won’t work. Always measure before buying.

2. Not for heavy-duty or commercial use – Series 4 is the lightest “real” series rating. If you’re running a 7-foot+ brush hog on a 60+ HP tractor, you need Series 5 or 6. This shaft will twist or snap under sustained heavy loads.

3. Locking pins can be tight – Several users mention the spring pins require significant force to push in. Gloves help, but it’s not as smooth as premium brand yokes.

4. No universal joint (U-joint) option – This is a straight shaft with telescoping tubes. If your implement requires a constant-velocity (CV) joint to handle extreme angles, this won’t fit.

Bottom Line

The 31.5"-41" PTO Shaft with slip clutch is a smart, budget-friendly choice for compact tractor owners who need a reliable replacement or spare driveline for light-to-medium-duty mowing. The slip clutch is the real winner here—it saves your gearbox from costly damage without the hassle of shear pins. Just be sure your tractor falls within the 25-50 HP range and that your implement’s input shaft is within the length limits. If you’re a weekend warrior with a Bush Hog or finish mower, this shaft will serve you well. For heavy commercial use or larger tractors, step up to a Series 5 or 6.

Frequently Asked Questions

Q: Will this fit my John Deere 1025R (or similar sub-compact)?
A: Possibly, but measure carefully. Sub-compacts often have a shorter PTO stub and implement input shaft. The collapsed length of 31.5" may be too long for some sub-compacts. Measure from the tractor’s PTO face to the implement’s input—if it’s under 31", you’ll need a shorter shaft.

Q: How do I adjust the slip clutch?
A: The clutch is preset from the factory. If it slips too easily (or not at all), loosen the center bolt, adjust the spring tension with a wrench, and retighten. Consult your implement’s manual for the correct torque setting—typically 150-200 ft-lbs for medium-duty mowing.

Q: Can I use this on a tiller or snowblower?
A: Yes, as long as the implement uses a standard 1-3/8", 6-spline input and requires 25-50 HP. For tillers, the slip