LUBRICATION
Operating Temperatures
-With
Eaton Roadranger
CDSO
Transmission Fluid
Heavy Duty Engine Oil
and Mineral Oil
The transmission should not be operated consistently
at temperatures above
250° F (120° C}. However,
intermittent operating temperatures to
300° F (149°
C}
do not harm the transmission. Operating temperatures
above
250° F increase the lubricant's oxidation rate
and shorten its effective
life. When the average oper-
ating temperature
is
above 250°
F,
the transmission
can require more frequent
oil changes or external
cooling.
The following conditions
in
any combination can cause
operating temperatures of over
250°
F:
(1
)operating
consistently at
slow speeds,
(2)
high ambient tempera-
tures,
(3)
restricted air flow around transmission,
(4)
exhaust system too close to transmission,
(5)
high
horsepower, overdrive operation.
External oil coolers are available to reduce operating
temperatures when the above conditions are encoun-
tered.
Transmission
Oil
Coolers
are:
Recommended
-With
engines of 350 H.P. and above with
overdrive transmissions
Required
-With
engines 399 H.P. and above with over
drive transmissions and GCW's over
90,000 lbs.
-With
engines 399 H.P. and above and 1400
lbs-ft
or greater torque
-With
engines 450 H.P. and above
With
EP
or
Multipurpose Gear Oil
Mild
EP
gear oil and multipurpose gear oil are not
recommended when lubricant operating temperatures
are above
230° F (110°
C).
In
addition, transmission oil
coolers are not recommended with these gear oils
since the oil cooler materials can
be
attacked by these
gear
oils. The
lower
temperature
limit
and
oil
cooler
restriction
with
these
gear
oils
generally
limit
their
success
to
milder
applications.
5
Proper Lubrication Levels
as Related
to
Transmission
Operating
Angles
If the transmission operating angle
is
more than 12
degrees, improper
lubrication can occur. The operat-
ing angle
is
the transmission mounting angle
in
the
chassis
plus the percent of upgrade (expressed
in
degrees).
The chart below
illustrates the safe percent of upgrade
on
which the transmission can be used with various
chassis mounting
angles. For example: if you have a
4 degree transmission mounting angle, then 8 degrees
(or 14 percent of grade)
is
equal to the limit of 12
degrees.
If you have a 0 degree mounting angle, the
transmission can be operated on a 12 degree
(21
percent} grade.
Anytime the transmission operating angle or 12 de-
grees
is
exceeded for
an
extended period of time the
transmission should
be
equpped with
an
oil
pump or
cooler kit to insure proper lubrication.
Note
on
the chart the effect
low
oil
levels can have on
safe operating angles.
Allowing the oil level to fall 1 /2"
below the filler plug hole reduces the degree of grade
by approximately 3 degrees (5.5 percent}.
Proper Lubrication Levels are Essential!
2
t---+--l--+--+--l---1---1
1 8'
0 0
0 2 3 4 5
67
Transmission Mounting Angle
Dotted line showing "2 Quarts Low"
is
for
reference
only. Not recommended
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