Front Wheel Toe-In; Inspection And Adjustment - PREVOST H3-41 Maintenance Manual

due to irregular setting, the front axle caster
needs adjustment; it can be adjusted by means
of shims (Prevost #110663) on the left-hand
side upper radius rod support in order to obtain
minor adjustment.

16.4 FRONT WHEEL TOE-IN

Wheel toe-in is the degree (usually expressed in
fractions of an inch) where the forward part of the
vehicle front wheels are closer together than the
rear part, measured at wheel centerline height
with the wheels in the normal ''straight-ahead''
position of the steering gear.
Incorrect toe-in results in excessive tire wear
caused by side slippage and also steering
instability with a tendency to wander. Toe-in may
be measured from the center of tire tread or from
the inside of the tires. Take measurements at both
front and rear of axle (see ''A" and ''B'' in Figure
48).
When setting toe-in adjustment, the front
suspension must be neutralized; that is, all
component parts must be in the same relative
position when making the adjustment as they will
be when in operation.
To neutralize the suspension, the vehicle must
be rolled forward, approximately ten feet.
FIGURE 48: TOE-IN MEASUREMENT
For toe-in specifications, refer to 16.5 FRONT
WHEEL ALIGNMENT SPECIFICATIONS.
By rolling the vehicle forward, all tolerances in
the front suspension are taken up and the
suspension is then in its normal operating
position. Neutralizing the front suspension is
extremely important, especially if the vehicle has
been jacked up in order to mark the tires.
Otherwise, the front wheels will not return to their
normal operating position due to the tires
gripping the floor surface when the vehicle jack
is lowered.
NOTE
''Toe-in'' measurements must be taken at the
horizontal axis of the wheel centerline.

16.4.1 Inspection and Adjustment

Before checking front wheel toe-in, first check
the camber angles and make the necessary
corrections.
1. Measure the toe-in.
2. If the toe-in measurement is not within the
specified tolerance, carry out the following
procedure :
a.
b.
c.
FIGURE 49: FINE ADJUSTER SLEEVE ON TIE ROD
PA1621 Maintenance Manual All Series | Section revised June 2019
SECTION 14: STEERING
Loosen the pinch bolt on the right hand
(curb side) tie rod end where the
adjuster sleeve is located.
Turn the adjuster sleeve (Figure 49) until
the specified toe-in measurement is
obtained.
Tighten the pinch bolt nuts
TORQUE: 118-133 lb-ft (160-180 Nm)
39