Front Wheel Camber; Camber Check; Front Axle Caster - PREVOST H3-41 Maintenance Manual

SECTION 14: STEERING

16.2.8 Front Wheel Camber

Wheel camber is the number of degrees the top
of the wheel tilts outward (positive) or inward
(negative) from a vertical angle (Figure 46).
FIGURE 46: CAMBER
The camber angle is not adjustable. Camber
variations may be caused by wear at the wheel
bearings, steering knuckle pins or by a bent
knuckle or sagging axle center. Steering effort is
affected by improper camber, and uneven tire
wear will result. Excessive positive camber
causes an irregular wear of tire at the outer
shoulder and excessive negative camber causes
wear at the inner shoulder.

16.3 CAMBER CHECK

For camber specifications, refer to 16.5 FRONT
WHEEL ALIGNMENT SPECIFICATIONS in this
section
1. Use an alignment machine to check the
camber angle.
2. If camber reading is not in the specifications,
adjust the wheel bearings and repeat the
check. If the reading is still not within
specifications, verify the steering knuckle
pins and axle center.
3. See instructions
Maintenance Manual
Maintenance Manual NDS Axles".
38 PA1621 Maintenance Manual All Series | Section revised June 2019
in "DANA SPICER
Model NDS and
4. Check the wheel lateral distortion as
instructed in Section 13, ''Wheels, Hubs and
under heading,
Tires''
Distorted Wheel on Vehicle''. If distortion is
excessive, straighten or replace wheel(s).

16.3.1 Front Axle Caster

For caster specifications, refer to 16.5 FRONT
WHEEL ALIGNMENT SPECIFICATIONS. in this
section.
Positive caster is the rearward tilt from the vertical
axis of the knuckle pin. Negative caster is the
forward tilt from the vertical axis of the knuckle pin
(Figure 47). This vehicle is designed with a
positive caster. The purpose of the caster angle is
to give a trailing effect. This results in stabilized
steering and a tendency for the wheels to return to
the straight-ahead position after taking a turn.
Excessive caster results in hard steering around
corners. A shimmy may also develop when
returning to the straight ahead position (pulling out
of curves).
FIGURE 47: CASTER
Insufficient caster will cause wandering and
steering instability. Caster variations may be
caused by a bent axle, tilting or distortion of the
side suspension supports, damaged radius rod
bushings, or unequal tightening of the front and
rear suspension support bolts. Incorrect caster
must be corrected by replacing the damaged
suspension parts. A precision instrument should
be used to measure the caster.
NOTE
The caster of this vehicle is factory set and is
not adjustable. However, if after replacing
damaged parts or in case of improper caster
''Checking for