Western Star 47X 2020, Руководство по обслуживанию

Страница: 86 / 166

ence at the tires and wheels. There must be at
least 0.50 inch (13 mm) clearance from any fixed
object, and 0.75 inch (19 mm) from any moving
object.
If necessary, loosen the stopscrew locknut; ad-
just the stopscrew to contact the axle when the
maximum turning angle of the wheels is deter-
mined.
Tighten the locknut to the value in the torque
table under Alignment Specifications.
3. Repeat the step above with the steering wheel
turned counterclockwise. Adjust the axle stop, as
needed.
4. Adjust the steering gear so that pressure is re-
leased ahead of the axle stop. This will prevent
possible damage to the steering or axle compo-
nents. For poppet valve adjustment instructions,
refer to
Group 46 in the Western Star 47X and
49X Workshop Manual .
5. Drive the vehicle off the turn-plates or turntables.
Camber Angle
IMPORTANT: For vehicle alignment to be accu-
rate, the shop floor must be level in every direc-
tion. The turn plates for the front wheels must
rotate freely without friction, and the alignment
equipment must be calibrated as directed in the
alignment equipment manufacturers mainte-
nance procedures and intervals. Western Star
dealers must have proof of this calibration his-
tory.
Compare the camber angles with those shown in the
appropriate table in Alignment Specifications in this
section. Differences between the measurements
taken in the step above and the angles in the table
are caused by damaged (bent) axle components.
Incorrect camber angles could be caused by damage
in one or more of the following front axle compo-
nents: the knuckle pin, the knuckle pin bushings, the
axle spindle, or the axle beam. Replace twisted or
otherwise damaged components. Don’t try to
straighten twisted or bent components; replace them
with new components. If a bent or twisted front axle
knuckle pin, axle spindle, or axle beam has been
straightened, the axle warranty will be voided.
Caster Angle Adjusting
Caster angle is the tilt of the knuckle pin (or kingpin)
as viewed from the side of the vehicle. See
Fig. 12 .
IMPORTANT: Do all the preliminary checks in
Section 33.00, Subject 100 in the Western Star
47X and 49X Workshop Manual before checking
the caster angle.
IMPORTANT: For vehicle alignment to be accu-
rate, the shop floor must be level in every direc-
tion. The turn plates for the front wheels must
rotate freely without friction, and the alignment
equipment must be calibrated as directed in the
alignment equipment manufacturers mainte-
nance procedures and intervals. Western Star
dealers must have proof of this calibration his-
tory.
Using the alignment equipment manufacturer’s oper-
ating instructions, measure the front wheel caster.
Compare the caster angles with those shown in the
appropriate table in Alignment Specifications in this
section. If needed, adjust the caster angle by placing
wedge-shaped shims between the axle spacer and
the axle beam, as follows (see
Fig. 13 ):
IMPORTANT: Extreme angle shims cannot be
used to correct caster angles that vary by more
than 2 degrees from the values in the table.
f330016 10/21/2016
1
1. Stopscrew and Locknut
Fig. 11, Axle Stop
Front Axle
33
47X and 49X Maintenance Manual, August 2020
33/6