SECTION 10: FRONT I-BEAM AXLE
12 PA1621 Maintenance Manual All Series | January 2017
Hubs and Tires’’. Inspect the tires for wear
patterns indicating suspension damage or
misalignment.
a. Make sure the tires are inflated to the
specified pressure.
b. Make sure the front tires are the same
size and type.
c. Make sure the wheels are balanced.
d. Check wheel installation and
straightness.
3. Check the wheel bearing adjustment. See
Section 13, ‘’Wheels, Hubs and Tires’’.
4. Check steering linkage for bending and
pivot points for looseness.
5. Check knuckle pins for evidence of
excessive wear.
6. Check radius rods for bending and rubber
bushings for evidence of excessive wear.
7. Make sure all fasteners are tightened to the
specified torque. Use a torque wrench for
verification. As soon as the fastener starts
to move, record the torque. Correct if
necessary. Replace any worn or damaged
fasteners.
7.2 MINOR FRONT WHEEL ALIGNMENT
Perform a minor front wheel alignment for all
normal maintenance conditions.
Perform the minor front wheel alignment in the
following sequence :
1. Inspect all the systems that affect the wheel
alignment. See paragraph 6.1, ‘’Inspection
Before Alignment’’ in this section.
2. Check the hub bearings. See section 13,
‘’Wheels, hubs and Tires’’ under paragraph
Front and Tag Axle Wheel Hubs.
3. Check and adjust the toe-in.
7.3 MAJOR FRONT WHEEL ALIGNMENT
Perform a major front wheel alignment to correct
steering and tire wear conditions.
Perform the major front wheel alignment in the
following sequence:
1. Inspect all systems affecting the wheel
alignment. See paragraph 7.1, ‘’Inspection
Before Alignment’’ in this section.
2. Check the hub bearings. See section 13,
‘’Wheels, hubs and Tires’’ under heading 8:
Front and Tag Axle Wheel Hubs.
NOTE
If steering angle stoppers are changed, a
special procedure is required for readjusting
gearbox steering limiter. See paragraph 7.5
‘’Hydraulic Stop’’ in this section.
3. Check and adjust the turning angle
adjustment.
4. Check the camber angle.
5. Check and adjust the caster angle.
6. Check and adjust the toe-in.
7.4 TURNING ANGLE ADJUSTMENT
The maximum turning angle is set through the
two steering stop screws installed on the axle
center. The turning angle is factory adjusted to
accommodate the chassis design, and
therefore, does not require adjustment on new
vehicles. However, it should be checked and
adjusted any time any component of the steering
system is repaired, disassembled or adjusted.
Check if front tires rub against the frame or if the
steering gear has been serviced.
Proceed with the following method to check the
steering maximum turning angle :
7.4.1 R.H. Turn Adjustment
CAUTION
To prevent the steering damper from interfering
with the adjustment of turning angles, make
sure its fixing bracket is at the correct location
on the axle center (refer to section 14
“Steering”).
1. Turn steering wheel to the right until the boss
on the axle center touches the right stop
screw.
2. Verify the nearest point of contact of the ball
socket body with the air spring support
assembly. Measure the distance between
those two points.
3. The distance between these two points
should be approximately 1/8 inch (3 mm). If
not, the steering stop screws must be
readjusted.
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