Chevrolet 10 Series 1968, Service Manual, Page: 548 / 713

STEERING 9-15
3. Disconnect the two pump to control valve hose con­
nections and allow fluid to drain into a container,
then disconnect the two remaining valve to power
cylinder hoses.
4. Remove the retaining nut from the ball stud to pit­
man arm connection and disconnect the control valve
from the pitman arm.
5. Turn the pitman arm to the right clear of the control
valve and unscrew the control valve from the relay
rod.
6 . Remove the control valve from the vehicle.
Installation
1. Install the control valve on the vehicle by reversing
the removal procedure.
2. Reconnect the hydraulic lines, fill the system with
fluid and bleed out air using the procedure outlined
under "Maintenance and Adjustments” . Grease ball
joint.
POWER STEERING GEAR AND CONTROL V A L V E -
40, 50 AND 60 SERIES (Fig. 23)
Rem oval
1. Mark steering shaft to control valve stub shaft re­
lationship and disconnect the steering shaft from the
lower coupling.
2. Remove hoses from valve.
3. Remove pitman arm bolt, nut, washer and pitman
arm.
4. Remove mounting bolts and steering gear.
Installation
1. Install power steering gear on vehicle by reversing
removal procedure.
2. Check steering gear for proper lubricant level.
3. F ill power steering system with fluid and bleed out
air using the procedure outlined under "Maintenance
and Adjustments'’ .
POWER CYLINDER
Rem oval
1. Disconnect the two hydraulic lines connected to the
power cylinder and drain fluid into a container.
Do not reuse.
C l 0-P -2 0 -3 0
a. Remove cotter pin, nut, retainer and grommet
from power cylinder rod attached to the frame
bracket. Also remove grommet and retainer
from bracket if replacement parts are required.
b. Remove cotter pin, nut and ball stud at relay rod.
4 0 -5 0 -6 0 Series (Except 9 ,0 0 0 lb. and 11,000 lb.
Front A xles)
a. Loosen dust covers from ball joints at each end of
cylinder.
b. On each end of power cylinder remove the cotter
pin locking the adjusting screw in position and
back out adjusting screw far enough to pull cyl­
inder off ball stud.
F ig. 28—Side Mounted P.S. C ylin d e r
60 Series with 9 ,0 0 0 lb. or 1 1,000 lb. Front A xles (Fig. 28)
a. At frame attachment, loosen dust cover, remove
cotter pin locking the adjusting screw in position
and back out adjusting screw sufficiently to pull
cylinder off ball stud.
b. Remove cotter pin, nut and ball stud at pitman
arm.
2. Remove power cylinder from vehicle.
Installation
1. Install the power cylinder on the vehicle by reversing
removal procedures.
NOTE:
When installing power cylinders incor­
porating an adjusting screw at the ball stud at­
tachment, tighten screw, with ball stud in place
until it bottoms, then back off to nearest hole
and secure with cotter pin.
2. Reconnect the two hydraulic lines, fill the system
with fluid and bleed out air using the procedure out­
lined under "Maintenance and Adjustments” . Grease
ball joint.
POW ER STEERING HO SES
When servicing power steering hoses, avoid twisting
the hoses unnecessarily. Install hoses with the wheels in
the straight ahead position, then turn the wheels to the
right and left, while observing movement of the hoses.
Note and correct any hose contact with other parts of the
vehicle that could cause chafing or wear.
Any maintenance operation, on the power steering
equipment, should include a thorough inspection of the
hydraulic line system, including the oil cooler if used.
Figure 29 illustrates typical installations.
CHEVROLET TRUCK SERVICE MANUAL