PREVOST GKN AXLES LIMITED KIRKSTALL DIVISION, Руководство по обслуживанию

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Section 16: SUPPLEMENT INFORMATION ON INDEPENDENT FRONT SUSPENSION (IFS)
16-4
1. INTRODUCTION
This supplement contains service procedures
and specifications that apply to the PRÉVOST
XL converted coach shell vehicles equipped
with an independent front suspension.
Where no differences (or minor differences)
exist between informations given in XL Main-
tenance Manual, Section 10, 12, 14 and 16,
(for vehicles equipped with beam axle sus-
pension) and informations given in this SUP-
PLEMENT INFORMATION ON INDEPEND-
ENT FRONT SUSPENSION (for vehicles
equipped independent front suspension), no
information is given in this section. In those
instances, the original material included in the
XL Maintenance Manual should be used.
2. STEERING LINKAGE
2.1 General Description
Turning motion of the steering wheel is
transferred by the steering gear and steering
linkage to the steering arms at the right and
left front wheels. The steering linkage consists
of tie rods connected to the bell crank and the
steering arm at the left side of the coach, and
to the idler arm and steering arm at the right
side of the coach. The bell crank and idler
arm are connected by a relay rod. A drag link
connected to the bell crank and the pitman
arm, which is mounted to the steering gear,
transfers the turning motion of the steering
wheel to the steering arms (Fig. 1).
Lower and upper A-arms are widely spaced.
They are mounted on ball joints. Torque rods
prevent rotation of the uprights around the
lower and upper ball joints.
If the steering linkage is bent, twisted or worn,
steering action of the coach will be seriously
affected. Any time steering linkage compo-
nents are replaced or adjusted, steering ge-
ometry and front wheel alignment must be
checked as explained in this section of sup-
plement.
FIGURE 1: SUSPENSION AND STEERING LINKAGE
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