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On 20 or
30
Series trucks, drain
lubricant
every
24,000 miles. If vehicle
is operated
in ex-
ceptionally
heavy
work
or
at
continuous
high
speeds, the lubricant
should
be
ch
anged every
12,000 miles.
It
may be
n
ecessary to change
lubricant
more often if vehicle is
used off
road in
dusty areas.
Positraction
Same
as standard axle
but use
only
the
special
Positraction lubricant available at your
Authorized Dealer.
FOUR WHEEL DRIVE
NOTE: The two (2) rear lubrication fittings on
the front axle drive shaft are inaccessible.
Lubrication of
this
universal joint
will
require
disassembly of the shaft from the
transfer
case.
.
Most
lubrication recommendations and
prece-
dures for 4
wheel
drive-equipped trucks
are
the same
for
corresponding components of
con-
ventional
drive
trucks.
Only the front
axle,
including the differential
and
Cardon joint,
the
'transfer case, which transmits power
from
the
transmission to
either front
or
rear
axles,
and
associated
linkage points and
air
vents require
special procedures.
Front Axle
The front
axle should
be checked
every
6,000
•
52
•
miles
and
refilled
with
S.A.E.
90
"Multi-Purpose"
Gear Lubricant
when necessary. With the
differ-
ential at operating temperature, fill to the
level
of
filler plug
hole. If
differential is
cold,
fill to
level
of
'h"
below the filler plug hole. Capacity: 5 pI.
Cardon
Joint
After
every
6 ,000
miles
of
driving,
re
-
move
the
slotted
pipe
pI
u
gs from the
ball
ends of the axle
hous-
ings. Check lubricant
and
refill
with
S.A.E.
140
Multi-Purpose
lu-
bricant
meeting U.S
.
Army
Ord.
Spec.
MIL-
L-2105B
('h
pt. per
joint)
if
necessary.
Re-
place the pipe plugs
securely.
Air
Vent
Hose
Check vent hose
for
kinks and
proper
instal-
lation
every 6000
miles.
Transfer Case
Check
the
transfer
case
level
every 6,000
miles
and,
if
necessary, add lubricant to bring to the
level
of the filler plug
hole.
Use SAE
"Multi-
purpose" Gear
Lubricant,
meeting requirements
of U.S. Ordnance Spec. MIL-L-2105B
and follow
the "Gear
Lubricant
Viscosity
Table"
on
page 51
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