Oil Changes - Peterbilt 579 Operator's Manual

Type
*Synthetic Gear Oil Meeting MIL-2105C or
API-GL5
*EP Gear Oils are not recommended when lubricant operating temperatures are above 230° F (110° C).

Oil Changes

CAUTION
When adding oil, types and brands of
oil should not be intermixed because
of possible incompatibility, which could
decrease the effectiveness of the lubri-
cation or cause component failure.
An initial oil change and flush should
be performed after the transmission
has been placed in actual service.
This change should be made any time
after 3000 miles (4800 km) but never
longer than 5000 miles (8000 km) of
over-the-road service. In off-highway
use, the change should be made after
24 hours but before 100 hours of
service have elapsed.
(04/13)
Grade (SAE)
EP75W90
EP75W140
Refilling
Remove all dirt around filler plug. Refill
with new oil of the grade recommended
for the existing season and prevailing
service. Fill to the bottom of the
level testing plug positioned on the
side of the transmission. Do not
overfill the transmission. Overfilling
usually results in oil breakdown due
to excessive heat and aeration from
the churning action of the gears. Early
breakdown of the oil will result in heavy
varnish and sludge deposits that plug
up oil ports and build up on the splines
and bearings. Overflow of oil can also
escape onto clutch or parking brakes.
When adding oil, do not mix different
types of oil.
Y53-6047–2C
LUBRICANT SPECIFICATIONS
Ambient Temperature
All
5
5-43