Explore VEVOR's complete collection of tractor PTO shaft assemblies designed for rotary cutters, tillers, post hole diggers, balers, and grain augers. There are Series 4 and Series 5 drivelines, straight and slip-clutch setups, 1-3/8" 6-spline and 21-spline ends, and collapsed lengths that are the right size for both compact and utility tractors. All of the products in this line come with heat-treated yokes, strengthened cross journals, and safety shields that meet CE standards. This shaft fits your horsepower and hitch, whether you are replacing an old driveline or adding a new tool.
Every time your cutter hits a stump, do the shear bolts break? With a built-in slip clutch, tractor PTO shaft assemblies absorb shock loads instead of transmitting them to the gearbox. This keeps your gearbox from breaking down and costing you a lot in repairs. VEVOR sells drivelines for small, medium, and large tractors, so contractors, farmers, and groundskeepers can easily match horsepower, spline pattern, and working length.
Series rating and clutch type determine whether a driveline will last through its first season. Both are easier to understand than their list numbers suggest.
Series classification is a standard way to describe torque capacity, and it increases as the tube size and cross-journal dimensions grow. At 540 RPM, a Series 4 PTO Driveline Shaft can usually handle 45 to 55 HP, which is enough for most compact and small utility tractor tools.
When you move up to Series 5, the capacity increases to about 65-75 horsepower, and the tubing has thicker walls and larger universal joints throughout. At the very least, this is the level that most rotary cutters over six feet, larger tillers, and heavier balers require.
Instead of your tractor's peak output, you should always match or exceed the series the implement maker says it can handle. Undersizing causes joints to wear out too quickly, tubes to twist, and the structure to eventually break under shock loads. It does not hurt to go a little bigger, which is why many operators use the same Series 5 tractor PTO shaft assemblies for all their different implements, making extras easier to find.
Layers of friction plates held together by springs make up a slip clutch pto shaft. When torque exceeds the set limit, such as when a mower blade hits a rock or an auger gets stuck in frozen ground, the plates slip briefly, dissipating energy as heat rather than breaking parts.
Compared with shear-bolt safety, this is a big plus. If there is an obstruction, a shear bolt stops the tool completely, and you have to get off to replace it. But if there is none, a tractor pto clutch resets itself right away.
The right spring setting is important. If the clutch is too tight, it never engages, which defeats the purpose. If it is too loose, it slips under normal load all the time, damaging the friction discs. When changing a PTO drive shaft with a slip clutch, follow the manufacturer's instructions exactly for spring height. Also, check it again after a few hours of use.
For tractors with 25 to 50 horsepower, a Series 4 PTO Driveline Shaft with Slip Clutch works with five- and six-foot rotary cutters, small tillers, post hole diggers, and light-duty flail mowers. On small fields and hobby acreages, this size is the most commonly replaced.
When the Series 5 PTO Drive Shaft with Slip Clutch slips more than once, it dissipates heat more quickly because it has a larger clutch pack with a greater friction surface area. Cutting down a lot of brush, reclaiming land with stumps all over it, and continuously baling all create that kind of repeated interaction.
The sizes are also different. Series 5 tubes have a noticeably bigger cross-section, so make sure you have enough space between the tool gearbox and drawbar before you order. If you work on rough ground often, the larger tractor PTO shaft assemblies' extra clutch capacity pays for itself the first time it keeps you from rebuilding the gearbox.
You need to burnish new and stored clutches before you use them. Loosen the bolts that hold the springs in place. Run the PTO slowly at low engine speed to make the plates slip and remove any rust film. Then, set the springs back to their original positions. Most of the time, a clutch will not slip when it should because you skipped this step.
Do this at the start of every season, especially after storing things in a shed without heat all winter. In humid places, rust forms surprisingly quickly and holds the friction discs to the pressure plate.
Every 8 hours, grease the universal joints, and grease them every time you use the telescoping tubes. Before each job, check the safety shield, chains, and bearing rings. A moving driveline is the most dangerous part of any tractor, and you must have a shield on your pto shaft with clutch.
It doesn't matter how well you do with the series if the ends don't fit or the length is off. Just two measurements will do it.
For 540 RPM, most agricultural tractors use a 1-3/8" six-spline output, while for 1000 RPM, a 1-3/8" 21-spline output is more common. Before you place your order, make sure you know both the tractor end and the tool gearbox input. They can differ on the same shaft.
The yoke connection is also different. For tools that you switch out often, push-pin collars are the fastest option. For permanent installations, bolt-on and quick-disconnect ball collars are better. Tractors always connect the PTO clutch assembly to the end of the implement, never the end of the tractor. Also, check the input shaft length on your tool. If the gearbox stub is too short, the yoke may not fully seat on the spline.
With the tractor and implement hitched and the drawbar in the working position, measure from the PTO output groove on the tractor to the PTO input shaft on the implement. In its flattened state, the shaft must be shorter than this measurement.
Aim for a two-inch gap when fully compressed and a one-third overlap of the tubes when fully extended. Check the measurement again with the three-point hitch fully up and fully down, as that is where the bottoming happens.
If a shaft is too long, cut the inner and outer tubes and their guards by the same amount. Then clean the parts thoroughly before reassembling them.
VEVOR offers Series 4 and Series 5 drivelines. They come in straight and tractor pto slip clutch configurations, 6-spline and 21-spline ends, and a wide range of folded lengths for small tractors up to utility tractors. Priced well below dealer parts, these assemblies include heat-treated yokes, hardened cross journals, greasable joints, and full safety shielding. Replacing a worn driveline has never been easier, with fast shipping and helpful after-sale customer service. Browse the collection now, then get back to work.
Match the manufacturer's specs for your tool, not your tractor's horsepower. Series 4 is good for 45 to 55 HP applications, and Series 5 is good for 65 to 75 HP and heavy shock loads.
Yes, for work that requires a lot of shocks. A slip clutch resets itself when the obstacle is gone, but a shear bolt stops the tool and has to be replaced by hand in the field.
With everything hitched, measure between the PTO output and input shafts. When the shaft is fully compressed, it needs to be shorter while still leaving two inches of space.
During storage, the friction discs probably rusted together. Once the plates are free, loosen the springs and run the PTO at a low speed for a short time. Then, reset to the specifications.
Every eight hours of use, grease the universal joints, and before each use, grease the extending tubes. Before every job, check the covers and chains for safety.
