PREVOST GKN AXLES LIMITED KIRKSTALL DIVISION, Руководство по обслуживанию

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Section 16: SUPPLEMENT INFORMATION ON INDEPENDENT FRONT SUSPENSION (IFS)
16-8
2.3 Steering Linkage Adjust-
ment
Note:
Whenever a steering linkage compo-
nent has been removed and replaced, check
steering geometry and front end alignment as
directed in this Supplement. Check to insure
that all stud nuts and mounting bolts and nuts
have been tightened to proper torques listed
under "16. TORQUE TABLE" at the end of
this supplement.
1. The pitman arm should be adjusted with
reference mark aligned or to an angle of
4.5° in relation with the vertical axis (Fig.
7).
2. Locate centerline of vehicle then install
relay rod in boss at steering bell crank
and idler arm. Align center of relay rod
with centerline of vehicle.
3. Install drag link to pitman arm and adjust
opposite end of drag link to fit mounting
stud hole in bell crank.
4. Install tie rods, then adjust toe-in as per
under paragraph "4 FRONT END
ALIGNMENT" of this Supplement.
FIGURE 7: PITMAN ARM ALIGNMENT
16042
2.4 Pitman Arm
2.4.1 Removal
1. Remove cotter pin, nut and washer from
drag link ball stud at pitman arm.
2. Disconnect drag link from pitman arm,
using jaw style pullers (pressure screw
type).
Warning:
Always wear approved eye
protection when operating pullers.
Caution:
Do not drive pitman arm on or off
pitman shaft as this can damage the steering
gear.
Caution:
Heating of components to aid in
disassembly is not allowed because it has a
detrimental effect on axle components and
steering linkages.
3. Remove pitman arm clamp bolt nut,
washer and bolt.
4. Check the radial position of the pitman
arm in relation to the sector shaft prior to
removal of pitman arm.
5. Add reference marks to the arm and shaft
if necessary to ensure correct alignment
at reassembly.
6. Remove pitman arm. A chisel will help
you loosen the pitman arm. Use a puller
if you cannot remove the pitman arm
manually.
2.4.2 INSTALLATION
1. Position pitman arm on sector gear shaft
with reference marks aligned. Ensure
that the clamp bolt groove matches.
2. Install bolt, washer and nut. Tighten nut
to 275-300 lbf
ft (373-408 N m) (Fig. 7).
3. Connect drag link to pitman arm. Install
washers. Tighten nut to 160 lbf
ft
(217 N m). Advance nut to next
alignment cotter pin slot and install a new
cotter pin.
2.5 Drag Link
Drag link assembly consist of three parts; a
drag link and two end assemblies. Both end
assemblies are identical and they are retained
on the drag link with a clamp bolt and nut.
Stud nuts at the pitman arm and bell crank ends
of the drag link must be kept tight or hole at ball
stud end of drag link and hole in pitman arm
may become enlarged as a result of excessive
looseness. Subsequent tightening of stud nuts
may draw studs too far into holes and dust
cover parts may become damaged which can
result in component failure.