MAINTENANCE
Crusader
MC-8
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.
MANUAL
clamps
and
turn
tie-rod
aS-
required
then
tighten
the
clamps.
If
the
vehicle
is
not
on
gauge
plates,
move
it
backward
then
forward
about
six feet.
9.
Recheck
the
toe-in
to
ensure
that
it is
correct.
STEERING
GEOMETRY
Steering
geometry
is
dependent
on
the
design
of
the
front
end
components.
Field
adjustments
are
not
possible,
but
a
check
should
be
made
to see
that
steering
arms,
linkage
and
other
parts
are
properly
installed
and
are
not
bent
and
distorted.
Bent
or
damaged
parts
should
be
replaced.
The
alignment
chart
includes
measurements
which
can
be
made
to
determine
sattsfactory
condition
of
front
end
parts.
MAINTENANCE
Periodic
inspection
of
the
front
axle
assembly
should
be
made
to
see
that
all
bolts
are
tight
and
that
no
damage
and
distortion
has
taken
place.
Suspension
support
stud
nuts,
U-bolt
nuts,
tie-rod
arm
and
steering
arm
nuts,
and
stop
screws
should
be
checked
and
tightened
if
necessary
to
the
torque
specifications
shown
at
the
end
of
this
section.
Attention
should
also
be
given
to
the
condition
of
the
steering
knuckle
pins
and
bushings.
If
excessive looseness is
found
at
this
point,
the
bushings
and
pins
should
be
replaced.
LUBRICATION
Periodic
lubrication
according
to
the
recom-
mendations
in
the
lubrication
section
of
this
manual
should
be
carried
out.
Points
which
require
lubrication
are
the
steering
knuckle
pins,
tie-rod
ends,
and
drag
link
ends.
These
are
provided
with
grease
fittings
for
pressure
lubrication.
Refer
to
Section
12
(Suspension)
for
details
of
procedures
necessary
to
remove
and
install
the
front
axle assembly.
Steering
knuckles,
king
pins,
and
bushings
may
be
replaced
without
removing
the
axle
from
the
coach.
Tie-rod
and
drag
link
ends
may also
be
replaced
without
removing
the
axle.
If
extensive
overall
work
or
straightening
of
the
front
axle
center
are
necessary,
the
axle
should
of
course,
be
removed.
CASTER
The
purpose
of
caster
angle
("N"
on
the
chart)
is
to
give a
trailing
effect.
This
results
in
stabilized
steering
and
a
tendency
of
the
wheels
to
return
to
the
straight
ahead
position
after
making
a
turn.
Excessive
caster
results
in
hard
steering
around
corners.
A
shimmy
may
also
develop
when
returning
to
the
straight
ahead
position.
Insufficient
caster
will
cause
wandering
and
weaving.
Caster
variations
may
be
caused
by
a
bent
axle,
tilting
or
distortion
of
side
suspension
supports,
or
unequal
tightening
of
the
front
and
rear
suspension
support
bolts.
KING
PIN
INCLINATION
The
purpose
of
king
pin
inclination
(B
on
the
chart)
is
the
same
as
the
purpose
of
camber.
A
check
of
the
king
pin
inclination
may
be
made
by
measurement
(U
and
V
on
the
chart).
The
use
of
proper
instruments
in
making
these
measurements
cannot
be
overemphasized.
STRAIGHTENING
AXLE
CENTER
The
front
axle
center
is a steel forging,
heat
treated
for
toughness
and
resistance
to
bending
and
torsional
strain.
If
the
center
is
bent
or
twisted
less
than
ap-
proximately
5 degrees from t:'ie _original
shape,
it
may
be
straightened.
However,
1t
1s
recom!11ended
that
this
work
be
done
only
by
mechantcs
who
are
thoroughly
familiar
with
such
operations
and_
where
the
proper
facilities
are
available.
Parts
which
are
distorted
more
than
approximately
5
degrees
from
the
original
shape
must
b~ r~p~aced,
since
su_ch
distortion
exceeds
the
elastic
hm1t
of
the
matenal
causing
fractures
which
may
result
in
failure
under
ordinary
operating
conditions.
CAUTION:
Never apply heat to a front axle forging.
Front
axle
parts should be straightened
cold
only.
FRONT WHEEL
ALIGNMENT
SPECIFICATIONS
Camber
(B
minus
A)
degrees
...............................
Right: Negative I /4°
::t
3/8°
........................
Left:
Positive
1 /4° t 3/8°
King
Pin
Inclination
(D)
degrees
...........................................
Left: 6- I /4°
................................
Right:
6-3/4°
Toe-In
(J
minus
H)
.........................................
I
/16"
plus
or
mi~u_s
I /16',;
Caster
Angle
(N)
.........................................................
Pos1t1ve 1.5
Drag
Link
Arm
Center
Ball
Stud
to
Top
of
I-Beam
(E)
..........
8'.'.
plus
or
m\nus
1/8'.'.
Top
of
Tie
Rod
Below
Spring
Seat
(F)
. . . . . . . . . . . . . . . . . . . . . . .
1-1
/4 plus
or
mmus
1 /8,,
Tire
Overhang
(G)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
appr~x.
6
3,,
Wheel
Track...................................................................
9. 0
Steering
Arm
Ball to
Axle
Centerline
.......................
On
C.L. plus
or
minus
1
/8"
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