GROUP
3-SUSPENSION, STEERING, WHEELS AND TIRES
tightened fitting leaks, replace the
seat.
PUMP, CONTROL VALVE,
AND POWER CYLINDER LEAK.
If the fittings and connections do not
leak, check the other parts of the
system.
PUMP RESERVOIR LEAKS.
Leak points at the pump reservoir
may be caused by improper installa-
tion or by a worn or defective cover
gasket. A worn or damaged stud
gasket on the stud at the center of
the cover may also cause leakage.
Check the hose connection at the
reservoir for leaks, and tighten the
hose clamp if necessary.
PUMP LEAKS. Leakage may oc-
cur at the O-rings in the orifices at
the top of the
pump body. The reser-
voir or pump adapter must be re-
moved from the pump to replace
these O-rings. Pump with adapters
have only one
"0"
ring.
Other pump leak points are the
shaft seal at the front of the pump,
the pump housing O-ring and the
other O-ring between the two halves
of the pump, and the relief valve
retainer O-ring. Replace only the
defective parts as required.
CONTROL VALVE LEAKS. If
the control valve is leaking (some-
where other than the tube seats),
replace all the seals, using a control
valve seal kit. 'Use all the parts in
the kit, and be sure they are cor-
rectly installed. When assembling the
new seals in the valve, an application
of silicone grease to the internal parts
will help to provide a better seal
against future leakage. Apply grease
to the centering spring area, espe-
cially on the cap and spacer mating
surfaces. Coat the threads of the cap
retaining bolts with grease. The rub-
ber boot seals, the actuator assembly,
and the metal cup seals in the con-
trol valve should also be coated with
silicone grease.
Some oil remaining from the man-
ufacturing processes may be found in
the sleeve near the ball stud. Do not
confuse this oil with leaking fluid
from the hydraulic system.
POWER CYLINDER LEAKS.
The power cylinder may leak at the
piston rod seals. A power cylinder
seal kit should be used to correct
leakage. Do not replace the power
cylinder assembly unless the pis-
ton rod is scored or has a dull gray
finish instead of a high luster
chrome finish.
Check Turning Effort. With the
front wheels properly aligned
and
tire pressures correct, check the ef-
fort required to turn the steering
wheel.
1.
With the car on dry concrete,
set the parking brakes.
2.
With the engine warmed up
and running at idle speed, turn the
steering wheel to the left and right
several times to warm the fluid.
3.
Attach a pull scale to the steer-
ing wheel (Fig.
1).
Check the effort
reauired to turn the wheel at least
one complete revolution in both di-
rections. See Part
6-3
for the speci-
fied torque which should be approxi-
mately equal in both directions.
FIG.
1
-Checking Turning Effect
-Typical
TROUBLE DIAGNOSIS GUIDE
CONTINUED ON NEXT PAGE
BINDING OR POOR
RECOVERY
HARD STEERING
If the steering wheel binds or check the spool adjustment. If the
sticks when turned, or if poor recov- adjustment is correct, overhaul or
ery to the straight-ahead position
oc-
replace the control valve.
curs, check the
Pitman arm ball stud
Check the control valve travel reg-
in
the
'leeve. If
the
ulator stop adjustment. If the stop
stud
is
rubbing against
the
edge
is drawn up too tightly, the ball stud
the
sleeve
the
pin may will bind in the seats. Adjust the
be missing.
stop as required.
If either of the idler arm bushings
is worn or damaged, replace both
Check the control valve sleeve and
bushings.
the socket tube for damage. Replace
Check the steering gear adjust-
Parts that show signs of damage, and
ments (Section
2).
adjust the travel regulator stop.
Check the operation of the control Check for possible interference
valve spool in the valve housing. If
between the steering wheel and the
the spool is binding in the housing,
steering column.
If the effort required to turn the
may be defective and should be over-
steering wheel is greater than normal
hauled or replaced.
for the entire travel of the front If the pressure test shows that the
wheels, check the tire pressure then, trouble is in the control valve or
test the fluid pressure. Be sure that power cylinder, remove and inspect
there are no leaks, that the reservoir
these
uriits. Repair or replace any
is properly filled,
and that the belt damaged parts.
is properly adjusted. If the pump If the pressure test indicates that
output pressure is low, the pump the pressures throughout the system
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