BART
3-1-SUSPENSION,
STEERING,
WHEELS
AND
'TIRES
GENERAL
SERVICE
3-3
are within specifications, check the
lands for burrs. Small burrs may be
following items in the order given: removed with crocus cloth if the
Check the control valve spool
cen- edges of the valve lands are not
tering spring adjustment. Adjust if rounded in the process. If the spool
required (Section
3).
cannot be repaired, replace the con-
Check the control valve spool for
trol valve.
HARD
(Continued'
movement. If the spool does not Check the control valve ball stud
move freely, check for, and elim- for free movement in the ball stud
inate, interference between the sock- seats. If the stud is binding in the
et tube and the valve sleeve. If the seats, adjust the travel regulator stop.
spool is sticking in the housing,
re- If the hard steering still persists,
move the spool and check the spool check the front end alignment.
If excessive free play or lost mo- trol valve travel regulator stop.
tion is noticed when steering, check Check the control valve center-
the steering gear worm and ball nut ing spring adjustment. If the spring
mesh adjustment. adjusting nut is loose, tighten the nut
EXCESSIVE FREE PLAY
Check for excessive clearance be-
until it is snug, and then back off
NOISE
STEERING CHATTER
RATTLES
LOSS OF POWER ASSIST
tween the steering arm ball stud and the nut not more than
?A
turn.
Ex-
the ball stud seats. If the ball stud
cessive tightening may damage the
is loose in the seats, adjust the con-
stop pin.
Check the pump belt tension. A
Noise may result if the specified
loose or glazed belt can cause belt
hose is not used or if it is improp-
squeal. A glazed belt, even when erly routed. If noise still exists with
properly adjusted, may slip. the specified hose properly installed
Excessive torque at the pressure
and routed, the pump should be re-
line joints may distort the tube seats
moved from the car and inspected.
and cause noise.
A loose pump belt or air in the mounting nut torque. Replace the
fluid can cause chatter against the
bushings if worn. Torque the nut to
wheel stops during an extremely specification.
sharp turn. Check the belt tension,
Check the power cylinder piston
and adjust it to specifications or fill
rod insulators for looseness. If the
the reservoir if necessary. insulators are worn, replace them. If
Check for looseness in the idler the mounting nut is loose, torque it
arm rod connection.
Looseness at to specification, and torque the lock-
this point may be due to worn nut to specification.
mounting bushings or improper
Check the control valve spool
cen-
pin.
tering spring adjustment. If the ad-
Check for looseness between the
justment is loose, tighten the nut control valve ball stud and the ball
until snug, and then back off the nut stud seats. If the stud is loose in the
not more than
?A
turn.
Excessive
seats, adjust the travel regulator stop.
tightening may damage the stop
Check the entire system for dam-
for resistance to movement. If the
age, replacing parts as necessary.
piston moves easily with little or no
T~ghten a loose pump belt.
resistance, the internal parts of the
Test the fluid pressure to deter-
power cylinder are broken or dam-
mine whether the trouble is in the
aged. Replace the power cylinder if
pump, the control valve, or the broken or damaged.
power cylinder. Maladjustment of the control
If the pressure test indicates that valve spool centering spring can
the pump is at fault, remove and cause a loss of either right or left
overhaul or replace the pump. power assist. Check the adjustment,
If the pressure test indicates that
and readjust if necessary. Replace
the control valve or power cylinder
all defective parts.
is at fault, check as follows:
Check the operation of the
con-
Disconnect the power cylinder pis-
trol valve check valve. If the check
ton rod from the idler arm bracket. valve does not operate freely, re-
Operate the piston by hand to check
place the check valve assembly.
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