The appropriate PTO shaft is essential for ensuring a smooth and seamless transfer of power between a tractor and an attached implement or machine. Size is a crucial consideration when choosing a shaft, as is the PTO driveline series.
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If you make a mistake or measure incorrectly, you will likely cause damage to the shaft, tractor or implement — or all three. Furthermore, you may need to replace the PTO shaft tubing, U-joints, yokes or other shaft components.
If you’re in the market for PTO shafts or parts, you’ll find no shortage of options. Finding the right PTO shaft for your equipment can be challenging with so many choices, but PaulB Parts makes finding the right PTO shaft easy. This article offers advice on choosing proper PTO parts that will work with your equipment. We also provide extensive resources so you can determine what you need and offer the guided support of our knowledgeable staff.
PTO Shaft Selection Tips
Determining the correct PTO shaft that will function properly with your tractor is crucial to the maintenance and effectiveness of your equipment. Follow this advice to find just what you need the first time.
1. Determine if Your Driveline is North American
The first step in deciding which PTO driveline you need is figuring out if your PTO is North American or metric. You can easily determine this by the shape of your driveline’s tubing. Look at the shape of the tubing on your driveline. North American PTO drivelines are typically one of four shapes: square, round, rectangle, or splined.
On the other hand, a driveline shaped like a lemon, star, or with three lobes is likely metric. Specifically, lemon and star profiles typically belong to a German series PTO shaft. A tri-lobe profile indicates it is an Italian series shaft.
2. Take Appropriate Measurements
Next, take two measurements from the U-joint that is on the tractor or the drive end of the PTO:
• Measure the bearing cap diameter: Most U-joints have uniform cap diameters. Cap diameters can differ among Constant Velocity drivelines. For best practice and further accuracy, measure all caps.
• Measure the cross-kit width, cap to cap length: You will also need to measure the U-joint from the end of the cap to the end of the cap. To get the most accurate reading and increase your likelihood of finding the right PTO shaft, remove the cross-kit from the yokes before measuring.
Keep in mind the fact that some series are not uniform in width. Measuring the cross kit both ways is the best practice to ensure accuracy.
3. Look at Your Existing Equipment for Specifications
Locate the snap ring. If it’s in the bushing, it’s an internal snap ring. If not, it’s likely in the yoke ears and is an external snap ring. Note the bearing diameter, cap-to-cap overall length and snap ring type. It’s also important to know the amount of torque and horsepower needed to move through your PTO shaft. Male and female parts should have at least 6 inches overlap for torque load. Check the owner’s manual if you are unsure.
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One of the key factors in getting quality equipment is knowing how to take care of your existing equipment. When your equipment is not in use and is stored outside, take the PTO shaft off the machine, tractor or mower and keep it inside to avoid rust-causing moisture and prolong the life of your driveline.
Get a PTO Shaft that Works with Your Tractor
You need to consider several factors when purchasing a PTO shaft, and after you buy, you may find that you need to make a few adjustments so the shaft is the perfect size for your tractor. For example, you may need to cut your driveline to the proper length for operational overlap. If you raise your implement to get the shaft on, you could end up damaging your equipment. You should have an overlap of at least one-third between the shaft and tube. With a slip-sleeve, there will be about 3 inches of overlap.
If you need to shorten the shaft, check out our tips on cutting your shaft to size. We want to make this process easy for you by providing online resources and offering access to our team’s experienced knowledge by so you feel confident in the parts you buy. PaulB Hardware can help you find the PTO driveline you need! Browse our selection of PTO shaft drivelines online to find all the parts you need.
Research PTO Shaft Details Before Making the Final Purchase
PaulB Hardware provides a variety of resources to make your shopping experience more effective. We offer videos, articles and diagrams to help you understand the details of the parts you are purchasing. Our website has content that will help you with the following:
• Figure out the proper PTO series: We offer a thorough step-by-step process for determining your PTO Series through careful measurements. We’ve even included a handy tool to make the sizing process even easier!
• Taking apart a universal joint replacement: PaulB Hardware provides a comprehensive guide that tells you how to take apart a universal joint replacement, complete with pictures and detailed captions.
The PTO shaft plays the crucial role of transferring power from your tractor to an attached implement. The parts of a PTO shaft consist of the internal and external PTO yoke, universal joint, safety chain and safety shield. Several different types of PTO shafts are available, so it’s essential to choose the right one for your equipment and applications.
PaulB Hardware offers three different types of PTO shafts: North American, German and Italian. Each style includes several series options consisting of multiple choices for bearing diameter, cap-to-cap overall length and snap rings. The most accurate way to determine the correct series is to measure the outside diameter of the bearing cap and the U-joint from one end of the cap to the other. The location of the snap ring is another determining factor.
How to Measure the Parts of Your PTO Shaft
Properly measuring the parts of your shaft is crucial to choosing the correct PTO series size. Each piece needs to be measured in a specific way to align with the standardized sizing. Follow these steps to ensure you get the correct measurements and order parts that work with your tractor.
Choose PaulB Hardware for Your PTO Shaft Needs
PaulB Hardware is a trusted brand that offers quality parts at reasonable prices. Our experienced staff members are always just a call away. Our associates are willing to answer any questions you may have to ensure you can get the right products to meet your needs.
You can browse our PTO selection online today or contact us online to learn more.
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