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WHEELS AND TIRES
Page
1.
General Description
1-1
DESCRIPTION AND
MAINTENANCE
2. Hubs, Bearings and Oil Seals or
G
rease
Retainers
1-3
D
GENERAL DESCRIPTION
Thirteen-inch
diameter
disc-type
wheels a re used
on aU
vehicles.
Refer to
"Specifications-Wheels
and
Tires"
in
this
section of
the man-
ual for
complete specifications.
The front
hubs
are attached to
the
front brake drums. The front
wheel
bearing
cones and
rollers
rotate in
bearing cups
which are pressed
into
each hub. Grease
retainers
arc
instal-
led
at
the inner ends
of
the hubs to
prevent
lubricant from leaking
into
the brake drums.
The rear hubs
and beari ngs
are
in-
stalled
on
the
rear axle
shafts, and
the
oil
seals are
installed
between
thc
axle housing
ana the
axle
shafts.
All
service procedures for rear hubs,
bearings and
oil seals are
ou.lined
in
'"Section
5-Rear Axle
and
Drive-
line."
PERIODIC MAINTENANCE
Tires should
be checked
frequently
when cool
to be
sure
that
air
pres-
sures
agree
with
those
specified for
the tire being
checked.
Wheel
stud
nuts
should
be in-
spected regularly to
avoid
accidental
loosening
of
the wheels.
Keep wheels and hubs
clean. Peb-
bles
and
lumps
of
mud
or grease
wedged
between
the
wheel
or
drum
can
unbalance a wheel and ti
re.
A ti
re
inspection and innation
pressure
check
should be
performed
at
6,000 mile
intervals.
If unusual
ti re wear
is
noted,
front wheel
align-
ment
and
/
or
balance should
be
checked and
adjusted,
as
required.
Cross-switch wheel and
tire
assem-
blies at 12,000 mile
intervals
and
balance them, if necessary.
Lubrication and adjustment
of
front
wheel bearings
is rccommended
at
12,000
mile
intervals.
WHEEL AND TIRE BALANCE
Original balance of
a
wheel
and
tire assembly may be
lost due
to
wheel
misalignment,
irregularities in
tread
wear
caused by
sudden
brak-
ing
or
skidding,
an under-inflated
tire,
or
incorrect tire
repair.
Pre-
liminary information regarding
sta-
tic
and dynamic balance is
thus
in-
cluded
in this
section.
The wheel and
tire assembly
should
also be
checked
for
static and
dynamic
balance,
when-
ever
the
original tires
are
replaced.
StCitic Wheel
klClnce
A
wheel
is
statically
balanced
when
the weight about the axis
of
rotation
is
equally
diSlrib uled
and
there is no tendency for the
wheel
to
revolve
in
either
direction
when sus-
pended on frictionless bearings. Static
unbalance
eauses
vibrations
or
"tramp" and will
result in uneven tire
wear.
Corredins Static Unbala
nce
Before balancing the wheel and
tire
assembly,
remove aU dirt and
weights.
The
tires
must be
in
good
condition and
properly mounted.
T ires must
be inflated
to
correct
pres-
sure
and valve caps in
place.
Accurate
static
balance may be
obtained
with use
of
commercial
balancing equipment. The placement
of
balancing weights and use of the
equipment
is ex.plained in
instrl·-.:tions
furni shed with the unit.
If
a (
ron
t
wheel
h ub
and
d
rum
is
removed,
dean bear
ings
and
re-
pack wit
h
r~o
m mend
ed
wheel
bearing grease_
Dynamic WhNl ....
~
A
wheel
is dynamically balanced
when it runs
smoothly
both
on its
axis of
rotation
and
on
an
axis
thro
ugh
the
center of
the tife and rim
perpendicular to
the
axis
of
rotation.
Wheel
"shimmy"
and
vibration
result
from dynamic
unbalance,
causing
ex-
cessive
tire
wear and
loosening
of car
body
and
parts.
A
wheel
must always
be
put
in static
balance before at-
tempting
dynamic balancing.
Corredins Dynam ic
UnbCIlonce
Dynamic unbalance
can be cor-
rected with use
of
available
commer-
cial test fixtures
which
include the
necessary
instructions
for
use and
placement of balancing
weights.
Corrections
of
dynamic unbalance
must be made without destroying
static
balance by proper installation
of
weights.
WHEEL AND TIRE
REMOVAL
AND
INSTAlLATION
The unitized
body-frame
construc-
tion
of
the
vehicle
requires
special
precautions and
procedures
when the
car
is jacked-up
or hoisted.
In
some
cases,
special
hoist adapters must
be
used as recommended by
specific
hoist manufacturers. (Refer to
Sec-
tion
J
3 fo
r
recommended
lifting
pracedu res. )
1. Pry off the wheel cover and
loosen, but do not remove the
wheel
stud nuts.
2. Raise the car
until
the
wheel and
tire
clear
the
noor.
3. Remove the wheel stud nuts and
the wheel
and
tire
from the
hub
and drum.
4.
aean
all
dirt from the hub and
drum.
Be
sure t hat the
replace-
ment wheel
and tire are
ckaL
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