The Life of a Power Take-off Depends on You
The power take-off is a critical component of a work truck’s hydraulic system as it transfers the power of the vehicle’s engine to auxiliary components executing a given application. As the power take-off is mounted to the transmission, PTO failure due to neglected maintenance can cause downtime resulting in loss of revenue.
Considering the consequences, it begs the question – why is power take-off maintenance often neglected? As Product Application Specialist Charles Cole explained, part of the challenge of power take-off maintenance is the lack of guidelines for creating a maintenance schedule as there is no set standard due to varying factors that impact the PTO such as load, application type and more. Thus, creating a maintenance schedule must be determined on a case-by-case basis by the fleet’s maintenance manager.
“It becomes tribal knowledge,”
said Cole. “The life of a PTO can
vary greatly based on the amount
of horsepower required by the
Due to this lack of standardized,
guiding principles, Cole shares
some guidelines he has learned
through his personal experiences
and tribal knowledge to help others
increase the life of the power takeoff.
According to Cole, some PTOs
may only be used 10 to 15 minutes
a week while others may be used
10 to 12 hours a day. Regardless,
all PTOs should be checked within
a week or two following installation
to ensure that mounting bolts have
been torqued properly.
“A visual inspection of the PTO needs to be done weekly,” he said. “Many issues with PTOs could be prevented if these guidelines were followed.”
These visual inspections should include looking for leaks, checking for signs of wear and ensuring that the hose and wires are secured to the PTO and not rubbing against the transmission or other components – which can lead to fraying and leaks. Beyond visual ques, make sure to listen for any changes in normal sounds during operation as well.
"A good practice to follow is to
perform the PTO maintenance along
with regularly scheduled oil changes/
checks because both the PTO and
transmission use the same oil for
lubrication and operation," said Cole. "Because all of the maintenance is
being completed simultaneously,
downtime is minimized.”
Assuming there are no red flags during a visual or aural inspection, Cole recommends performing the first physical inspection for severe-duty applications after 100 hours of use. If after 100 hours of use extensive wear is noted, physical maintenance should be scheduled more frequently.
Physical inspections can be performed on some power take-offs by removing an inspection cover while others require removing the PTO from the transmission in order to complete the inspection. If the PTO has been removed for inspection, check the gears for unusual wear patterns and the bearings for smoothness or pitting. Presuming the gears and bearings have no issues, replace the gaskets and shaft seal. If the pump is remote mounted, check the drive shaft; otherwise, with a direct-mount pump – periodically clean and grease the pump splines where it connects to the PTO.
As Cole noted, in the end prevention will be the key to reducing the amount of downtime and the expenses associated with a lack of regularly scheduled PTO maintenance.
“Typically, it’s just like everything else,” he said. “If you maintain it, it’s worthwhile.”
Charles Cole - Product Application Specialist
A certified fluid power hydraulic specialist through the International Fluid Power Society, Charles (Chuck) Cole began his career with Muncie Power Products 36 years ago in 1981. Outside of work, Chuck enjoys water sports, snow skiing, working on cars and spending time at Lake Webster. Chuck is currently engaged and has a son, daughter and stepdaughter.