Fleet Maintenance 1220 - 38

Ü	Utility vehicles - aerial buckets or digger
derrick trucks
Ü	Refuse vehicles - side loaders, rear loaders,
front loaders, some roll-off trucks
Ü	Recovery trucks - flatbed trucks, wheel lifts,
tow trucks, integrated tow trucks
Ü	Snow and ice control - spreaders, snowplows,
parallel lift plows, truck wing plows
Mechanical:
Ü	Product pump applications
Ü	Vacuum pump applications
Ü	Pneumatic blower applications
Ü	Air compressor or generator applications
It is also possible for a vehicle to have more than
one application, meaning more than one PTO.
" The transmission might have two or three
openings, and you could have two or three PTOs
on that truck, " says Brad Gulick, regional sales
manager, vehicle group, North America, East
Region, and Canada for Eaton, a power management company. " One might work the back system
on a vacuum excavation unit, and the other PTO
might be a pump to run some of the outriggers ...
on the truck. "

Purchasing considerations

When purchasing an aftermarket PTO, fleets must
first and foremost know the vehicle's transmission
make and model number. According to Muncie's
Hart, this will enable fleets to use an online
resource to find the transmission and correctly
spec out a fitting PTO.
Next, fleets should take into consideration where
the PTO will be placed - driver's side, passenger's
side, top mount, bottom mount, or rear mount
opening. In addition, fleets will want to check if

the truck has been ordered with a PTO prep package. Vehicles with the prep package typically have
a bulge in the floorboard where the PTO will be
installed; those without it will have to deform
the vehicle floorboard during installation. Only
certain types of trucks come with this, Hart notes,
but it's a feature that is becoming more popular.
Other factors such as PTO shaft rpm, shaft rotation, and what is being driven by the PTO must be
considered. Also, fleets will have to decide how the
PTO will be shifted - by air, cable, electric-over-air,
or electric-over-hydraulic.
Lastly, Hart says, fleets should have the application specs: the gpm required, the working
psi required, the maximum psi, and the engine
rpm required for operation. Those numbers will
help fleets determine the necessary torque and
horsepower for the PTO. With all the information
above, fleets will be able to choose the proper PTO
for their vehicle with whatever applications they
have in mind.

AMTs versus manual
transmissions
While a PTO will complete the same tasks regardless of the transmission type with which it's mated,
there are some differences in installation and
operation when it comes to installing a PTO on a
vehicle with an automated manual transmission
(AMT) versus a manual transmission.
" The PTO really doesn't care whether it's getting
the power from a manual [transmission] or an AMT, "
says Tim Bauer, vice president of aftermarket for
Eaton. " [When] you bolt it up, it's virtually the same. "
When it comes to installation, however, Bauer
explains there a few differences between the two,

		»Pictured is the
Bezares 2000 series
PTO. Bezaresbranded PTOs are
distributed by Eaton
in North America.
Photo courtesy of Eaton

such as some sealing differences with the gaskets,
the software setup, and some backlash settings
that don't need to be done on an AMT.
Other differences between PTOs on AMTs and
manual transmissions include noise level, price,
PTO engagement, and ease of use.
Muncie's Hart explains that due to the larger gear
in AMTs, the PTO operates at a louder noise level
than manual transmissions. Additionally, PTOs
spec'd on vehicles with AMTs will have a clutch
shift design, versus manual transmissions which
require a mechanical shift type PTO. Also, PTOs
mated with AMTs shift using hydraulic pressure,
compared to PTOs on manual transmissions which
shift using air pressure. It can also be easier to
engage a PTO on an AMT because the user simply
has to push a button to engage the PTO versus
engaging the clutch for a manual transmission.

Common issues and
maintenance
Issues always seem to occur at the worst possible
times, but with proper spec'ing and installation,
following operation instructions, and adhering

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Fleet Maintenance 1220

Table of Contents for the Digital Edition of Fleet Maintenance 1220
