PART
3-1
-SUSPENSION, STEERING, WHEELS AND
TIRES
GENERAL
SERVICE
3-5
FLUID PRESSURE TEST
A
fluid pressure test will show
whether the pump or some other
unit in the power steering system is
causing trouble in the system.
1.
Disconnect the pressure line
hose from the pump outlet, and in-
stall the pressure testing tool be-
tween the hose and the pump outlet
(Fig.
2).
Be sure that the pressure
gauge is between the pump and
the shut-off valve on the tool.
2.
Open the shut-off valve on the
testing tool, and run the engine at
idle speed.
If
the pump normally
operates quietly, ignore the louder
pump noise when the pressure
testing tool is connected to the
system. Allow at least two minutes
for the fluid to warm up before
starting the pressure tests.
3.
Turn the front wheels all the
way to the right and then to the left,
noting the fluid pressure reading on
the gauge when each wheel is against
its stop.
Normal pressure is
750-900
psi.
Do not hold a wheel against its
stop for more than three to five
seconds at a time because the fluid
may overheat.
4.
If the fluid pressure, with a
wheel against its stop, is less than
750
psi turn the wheel off the stop.
Slowly close the testing tool shut-off
valve, and watch the gauge for an
increase in pressure. Do not leave
the valve closed for more than
three to five seconds.
5.
If the fluid pressure, with the
shut-off valve fully closed, still shows
less than
750
psi, the pump is caus-
ing the trouble. If the pressure in-
creases to normal pressure range, the
trouble is in either the control valve
or power cylinder.
6.
After the fluid pressure test is
complete, shut off the engine and re-
move the pressure testing tool. Make
the necessary repairs or replacements
to eliminate the trouble in the
system.
PUMP OUTLEl PRESSURE LINE
FIG. 2-Pressure Testing Tool Installed
COMMON ADJUSTMENTS AND
REPAIRS
FRONT WHEEL
ALIGNMENT CHECKS
Do not attempt to check and ad-
just front
wheeI alignment with-
out first making a preliminary in-
spection of the front-end parts.
Check all the factors of front
wheel alignment except toe-out on
turns before making any adjust-
ments. Toe-out on turns should be
checked only after caster, camber,
and toe-in have been adjusted to
specifications.
EQUIPMENT INSTALLATION
Equipment used for front wheel
alignment inspection must be accu-
rate. If portable equipment is being
used, perform all inspection opera-
tions on a level floor.
1.
Drive the car in a straight line
far enough to establish the
straight-
ahead position of the front wheels,
and then mark the steering wheel
hub and the steering column collar
(Fig.
3).
Do not adjust the steer-
ing wheel spoke position at this
time. If the front wheels are turned
at any time during the inspection,
align the marks to bring the wheels
back to the straight-ahead position.
2.
Install the wheel alignment
equipment on the car. Whichever
type of equipment is used, follow
the installation and inspection in-
structions provided by the equipment
manufacturer.
CASTER
Check the caster angle at each
front wheel.
Caster is the forward or rearward
tilt of the top of the wheel spindle.
If the spindle tilts to the rear, caster
is positive. If the spindle tilts to the
front, caster is negative. The correct
caster angle, or tilt, is
?ho
c
?h
".
The maximum difference between
ALIGNMENT MARKS
F1081-A
FIG. 3-Straight Ahead
Position Marks -Typical
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