One of the most common decisions concerning your Power Take-Off (PTO) is whether to repair or completely replace it. That decision depends on several factors, including the condition of the clutch’s components, what kind of symptoms you’re experiencing, and the cost-effectiveness of each option. Here’s how to evaluate the pros and cons of buying a clutch pack versus a new PTO.
What is the difference?
What’s the difference between a clutch pack and a new Power Take-Off? A new PTO will include the bellhousing, clutch pack, shaft, hand lever assembly, drive ring, and bearing collar. The complete PTO’s advantage is that it bolts directly to the engine and requires no assembly. Depending on the model, a new installation can easily have you back up and running in no time.
A clutch pack is the core part of a PTO. It includes the sliding sleeve, the release bearing, frictions, the backplate, the linkage, etc. In other words, the clutch pack is the assembly within the PTO housing and includes all the moving parts. As far as installation goes, the clutch pack is mounted on a tapered seat on the main shaft which is retained by the locknut. Once the tapered fit is free and the locknut and washer are removed, the clutch pack can be easily withdrawn in one motion, allowing for a pre-assembled replacement clutch pack to be fitted. This can usually solve most problems.
Assessing the Clutch Issue
As in everything mechanical, simple upkeep and following factory maintenance guidelines enhance the life of your clutch. Ideally, the most straightforward option would be repairing the clutch pack assembly. In well-maintained PTO assemblies, you only need to replace the friction and pilot bearing. If the clutch pack has declined past serviceable repairs and is beginning to show signs of minor wear or slight slippage beyond routine adjustments, it might be time to replace it.
Various repair and replacement issues for clutch packs and PTOs. Damaged bronze collar, grooved drive rings, sheared frictions, pilot bearing failure, overheated center plate and frictions, and shaft failure.
Replacement is usually the most effective solution for significant wear or damage, but some issues can be resolved to restore it to working order. Examples include checking the thickness and warpage on the center, floating, and back plates.
Each plate has a wear limit of 1/64 inch [0.40 mm] per wear surface. So, center plates will have a total wear limit of 1/32 inch [0.80 mm] because they have two wear surfaces. If any plate exceeds this limit, replacement is recommended. Please contact WPT for the nominal thickness of the plates.
To check for a warped plate, a straight edge can be placed on the wear surface in various locations to look for light gaps. If gaps are found, the plates can be machined up to 1/64 inch [0.40 mm] per side. If it exceeds that, replacement is recommended.
Drive ring teeth should be inspected for burs, grooves, worn teeth, or other damage. Slight imperfections like burs can be removed with a file. Grooving and worn teeth will require replacement. In conjunction with these issues, they need a significant amount of labor. That leads us to the following consideration: costs.
Initial Cost Breakdowns
The cost of repair or replacement is always important. A clutch pack can be more cost-effective in the short term, especially if you have the tools and skills to disassemble, rebuild, and install it yourself. It is generally around 60% of the cost of a complete PTO. This isn’t always the case, and it can get a little convoluted if you need a drive ring or additional parts. As a general rule, it is better to replace the entire clutch on smaller units than the larger ones.
A complete PTO does include items like the main shaft, drive ring, main bearings, and hoses. Sometimes, repairing individual clutch components may be more economical in the long run if they are still serviceable. A replacement will be necessary for significant wear, such as drive ring damage or missing teeth, main bearing failure, misaligned shaft damage, or any critical role in the clutch operation. If you’re already paying labor costs to access the clutch, it often makes sense to replace the entire PTO rather than repairing one component and risking future issues.
Installation Cost Breakdown
The time away from your business and workforce is an additional cost in this decision-making process. Clutch replacement can be labor-intensive, whether removing a worn clutch pack versus a new PTO, inspections, ordering parts, or reinstalling. They are all downtime expenses until it’s operational.
Shipping Cost Breakdown
When it comes to shipping, clutch packs weigh less than a PTO. If needed, they can ship the same day that you order through a parcel carrier (e.g., FedEx, UPS). Complete power take-offs usually have to be shipped via truck, which costs more than parcels and has longer delivery times.
Final Decision
Obtain cost estimates for components, labor, and additional expenses like downtime and shipping. Full replacement is often the most cost-effective choice if the PTO components are significantly worn or damaged, especially if you’re looking for long-term reliability. Replace the clutch pack if the issue is minor, and the components can be fixed or adjusted without needing to rebuild the entire insides of the clutch.
Additional Information Available
Either option is a good choice, and hopefully, this article will help you decide between a clutch pack and complete PTO. Information on our Power Take-Off product range is available from an Authorized WPT Distributor near you. They can provide additional information, application assistance, or technical support, helping you make the most of our products. For more details, please visit our website at WPTpower.com or call us at 940-761-1971.