Table of Contents
Advertisement
serve
in
the
system. Depress
broke
pedol, hold light
foot
pressure
on
pedol,
ond slort engine.
If
the
vocuum
system
is operoting, pedol
will
tend
to
foll
owoy
under
foot
pressure,
ond
less
pressure
will
be required
to
hold
pedol
in opplied
position.
lf
no oction
is felt,
vocuum system
is not
functioning.
Stop engine ond
ogoin deplete
oll
vocuum reserve
in
system.
DePress
broke pedol ond hold
foot
pressure on
pedol.
lf
pedol groduolly folls
owoy
under
foot
pressure,
the
hydroulic
sys-
tem is
leoking.
Stort
engine.
With
brokes
off,
run to
medium
speed
ond
turn
off
ignition,
immediotely closing
throttle.
This
builds
up
vocuum.
Woit no
less
thon
ninetY
seconds,
then
try
broke oction.
lf
not
vocuum ossisted
for
three
or
more
op-
plicotions, vocuum check
volve
is
foulty
or
there
is
o
leok
in
the vocuum
system.
DIAGNOSIS
Conditions
ond Proboble
Couse
Hord
Pedol
Bosic
System
Bound
up pedol
mechonism
Glozed
linings
Lining soturoted
with
broke
fluid
or
greose
Swollen
moster
cylinder
cups
Corroded
moster
cylinder
bore
Hydroulic
line
restriction
Power
System
Foulty vocuum check
volve
Collopsed
vocuum
hose
Low monifold
vocuum
lniernol
vocuum
leokoge
Foulty
control
volve
operotion
Grobby
Brokes
Bosic
System
Greose
or
broke
fluid
on
linings
Brokes
in
need
of on
odiustment
Domoged
support
plotes
Domoged
broke
drums
Power
System
Foulty
control volve
operotion
Bind
in
linkoge
Pedol Goes
to
Floor
(or Almost
to
Floor)
Bosic
System
Brokes
in
need
of
on
odiust-
ment
Domoged
broke
shoes
(dis-
torfed)
Air in
hydroulic
system
BRAKES
AND
WHEELS
_
HUBS
AND
DRUM.S
Hydroulic
fluid
leokoge
Defective primory
cups
Hydroulic
reservoir low on
fluid
Defective
reor
piston
cup
on
secondory
piston
Power
System
Vocuum leokoge
Brokes
Foil
lo
Releose
Bosic
System.
Bound
up pedol
linkoge
Broken shoe
return
springs
Shoes
binding on support
plote
Defective residuol
check
volves
Swollen piston
cups
Primory piston
binding
in
piston
stop
Pedol odiustment
(closed
compensoting
port)
Power
System
Foculty
push
rod
odiustment
Bound
up
linkoge
WHEELS
AND
TIRES
1I
Thls
is
noticed
by
o
rounded
off
edge
on one
side
ond
shorpness
on the
oth-
er.
This
octuolly
meons
thot the
tire
is
slipping
sidewoys
or
scuff)ng
os
it
trov-
els down
the
rood.
lf
the "feothered
edge"
is
on the
in-
ner
sides
of
the treod, either on one
or
both tires,
it
indicotes
thot
one
or
both
tires hove
excessive
toe-in;
while
the
some condition
on the
outer
sides of
the
treods indicotes
excessive toe-out
ln
some instonces,
one front
tire
moy
indicote
toe-in weor, while
the
oppo-
site
tire
indicotes toe-out
weor.
When
this
condition
is
encountered, the
steer-
ing geometry
must
be
checked
ond
set
to
speciflcotions.
This condition
con olso
be
coused
by
bent
steering
orms,
with the
result
thot the
inside
wheel
on
both
turns,
either toes-in
or
toes-out
in
excess.
lnflotion
Pressures
One
of
the
most
importont
foctors
in
tire
core
is
to
mointoin proper
inflo-
tion.
ln
order
to
mointoin
the
correct
inflotion
pressure,
tires
should
be
checked when
cold.
The
effect
of
three
types
of
inflotion
pressures
ore
shown
in
Figure
29.
Recommended
pressure
for
normol
service
is
24
pounds
checked
cold
be-
fore running. Do not bleed
tire
pres-
sure
to
24 pounds if the tires ore worm.
For cors driven
of
sustoined
rotes
of
high
speed
or
on trlps
where obove
overoge
speeds
or
loods
ore
moin-
toined,
tire
pressures
moy be
increosed
up
to
30
pounds
(cold before
running).
The
higher
pressure
will
increose
sto-
bility with
some socrifice
of
riding
quo
Iity.
Whenever
the
oir
pressure
is
either
greoter
or
less
thon
recommended,
the
bolonce
of
forces
in the tire is
upset.
Results
ore obnormol weor
ond
premo-
ture foilure.
Wheel
Bolonce
Tire
ond wheel bolonce
is
very
im-
portont both
for
preventing
excessive
tire
weor
ond
for
eose
in
hondling
the
co
r.
There
ore
four
foctors involved
in
wheel bolonce
ond
eoch
one
must
be
considered.
Rodiol run-out is
the
unevenness of
treqd
coused
by
on
eccentric wheel or
tire
(Fig.
30).
To correctly
inspect
o
wheel
for
ex-
6.45
x
14
6.95
x
14
Tire
Pressure (Cold)
Front
ond
Reor
24
Lbs.
Tire
Weor
Abnormol
tire weor con be
coused
by
improper
inflotion
pressures,
wheel
bolonce,
mechonicol
irregulorities,
or
misoligned
front
suspension.
A
tire
severely
cupped
is
moinly
due
to
loose steering
connections,
loose
wheel
beorings,
or ony
excessive
looseness
throughout
the
front
suspen-
sion.
An
uneven
broke
odiustment,
out-of-round
broke drums, moy
olso
couse
ropid ond
uneven
tire
weor.
A
tire
which
is worn only
on
one
side
of
the treod
is
normolly
coused
by
excessive positive
or
negotive
comber.
The
extent
of
comber
weor is
lorgely
due
to
the
omount
of
comber
ongle
in
relotion
to
the type
or
shope
of
locol
rood
surfoces.
Treod
weor very similor
in
oppeor-
once
moy
olso be
coused
by driving
ot
high
speeds
on turns.
This is
known
os
"Cornering"
treod weor ond
connot
be
corrected
by the
chonging
of
the
comber ongle.
An
incorrect
toe-in
or
toe-out
odiust-
ment
will
couse
one edge
of
the
tire
treod
to
weor
to o
"feothered edge."
t
Tire Size
Stondord
Optionol
L
L
Advertisement
Table of Contents
