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PRODUCT
MERCHANDISING MANUAL - Power
Take-Off |
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THE POWER TAKE-OFF STORY |
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The Willys Jeep is the most versatile vehicle built
today. One of the most important elements of this versatility is the
Jeep's ability to supply a wide range of controlled power at Three Power
Take-Off points. Power that can energize generators, drive winches, run
saws, operate post hole diggers, propel snow augers, pump water and do a
multitude of jobs too numerous to list.
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An understanding of the
Jeep's Power Take-Off functions is the key to profitable sales of Willys
vehicles and a broad range of special equipment. First of all,
power is derived from two sources in the Jeep. Either it comes from the
crankshaft (by pulley or belt drive from the front of the engine) or
from the transfer case (by shaft connected to the drive gear.) In the
first instance, of course, the power take-off point cannot be put into
reverse and is always driven at engine speed. However, when power
is taken off the drive gear of the transfer case, the transmission lies
ahead of the Power Take-Off source so that the power can be controlled
by the conventional gearshift
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Power is delivered from
these two sources to three PTO points - front, center, rear. Power may
be delivered to the front PTO point from either the crankshaft or the
drive gear of the transfer case. In the first case, a special .pulley is
installed on the front end of the crankshaft to deliver single speed,
one directional power, for pumps, winches, sweepers, etc. This type of
equipment can only be reversed when there is a separate clutch mechanism
built into the auxiliary piece of equipment. Such install ations are
either controlled from the front of the vehicle or by an extra set of
levers in the floor of the cab to the right of the conventional PTO
lever. All necessary parts for this type of installation are furnished
with the auxiliary equipment.
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In the second case, power is taken off the drive gear
of the transfer case and drives, through a set of gears, a shaft that
lies parallel to the crankshaft and extends to the front of the vehicle.
This shaft, of course, can be operated through the conventional
gearshift and can, therefore, be reversed. An example of this type of
power use is found in the front mounted winches for the Willys Truck.
When power is needed at the center PTO point it can
0d.y come from the drive gear of the transfer case. It is, therefore,
controlled through the normal gearshift and is usually V-belt or chain
driven by cutting a hole in the floor of the Jeep right above the center
PTO source. In the case of the Willys truck, a short spline shaft
extension is required to position this center PTO point underneath the
truck cargo box and away from the cab. An example of PTO applications of
this sort are the portable welders and compressors mounted in the floors
of the Jeep or Willys 1-ton truck.
When rear PTO point applications are required, a
shaft is simply attached to the drive gear of the transfer case to
transfer the power to the rear of the Jeep or Truck. At the rear, this
power travels through a gear box attached to the drive shaft that
reverses the direction of the rotation of the spline shaft so that it
may conform to standard agricultural implement practice for rear mounted
equipment.
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Thus, in summary, the center PTO source may deliver
power to any one of the three PTO points while the crankshaft PTO source
only delivers power to the front PTO point. Even though power from the
crankshaft is unidirectional and cannot be controlled through the
conventional gearshift, front mounted auxiliary equipment for the Jeep
largely employs this source of power so that the drive gear of the
transfer case is free to also supply power to the center or rear PTO
points to operate additional auxiliary equipment. While both PTO's can
operate at the same time, they cannot, of course, both use the full
engine capacity simultaneously. Nevertheless, the front and center PTO
sources can effectively operate independently of one another on the same
vehicle.
Usually no two attached pieces of auxiliary equipment
may be powered from the same PTO source. An exception to this rule is
the front mounted 140RT73 winch for the Willys truck. When this winch is
used it is possible to mount a piece of auxiliary equipment powered from
the center or rear PTO points. This front mounted winch is powered from
the center PTO by a shaft that is gear driven from the shaft that
extends from the drive gear of the transfer case back to the rear PTO
point. In this particular case, the PTO control has two levers.
The first lever engages the rear PTO, the second lever meshes the gears
that connect the rear PTO to the other shaft that leads to the front
PTO. Thus by engaging the first PTO lever alone, power may be supplied
to a rear Power Take-Off point without engaging the front mounted winch.
But when the front mounted winch is engaged - the rear PTO point is
turning too. Thus any powered piece of auxiliary equipment at the rear
of the vehicle would have to be disconnected for optimum results when
the winch was in operation.
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With the 75 h.p. Hurricane Engine, the standard 6
splined, 1-3/8 " shaft in the rear Power Take-Off unit delivers a
maximum of 35.23 h.p. at the belt pulley. The same horsepower is
available at the front and center Power Take-Off points. When a piece of
equipment is directly connected to the front of the 75 h.p. Hurricane
crankshaft 57.6 h.p. is delivered to the front mounted equipment.
THE POWER TAKE-OFF MAKES ANY WILLYS UTILITY VEHICLE A
MOBILE SOURCE OF POWER. THE WILLYS UTILITY VEHICLE BRINGS THIS POWER TO
WHERE IT CAN BE MOST ADVANTAGEOUSLY USED. SELL THIS POWER OPTION
AND REALLY UNIVERSALIZE YOUR CLIENT'S WILLYS.
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