STEERING 9-37
NUT
Fig.
69—Control Valve Ball Stud Seal Replacement
(Service Type)
4.
Center the ball stud, seal and clamp at opening in
adapter housing, then install spacer, bolt and nut.
Removal
1.
Raise the front of the vehicle off the floor and place
it on stands.
2.
Remove the relay rod to control valve clamp bolt.
3.
Disconnect the two pump to control valve hose cdn-
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 pitman
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 CYLINDER (Fig. 70)
Chevy II and Corvette
Removal
1.
Disconnect the two hydraulic lines connected to the
power cylinder and drain fluid into a container. Do
not reuse.
2.
Remove cotter pin, nut, retainer and grommet from
power cylinder rod attached to the frame bracket.
3.
Also remove grommet and retainer from bracket if
replacement parts are required.
1.
Snap Ring
2.
End Plug and
Lube Fitting
3.
"O" Ring
Fig.
70—Power Cylinder—Exploded View
4.
Spring
5. Spring Seat
6. Ball Stud
7. Ball Seat
8. Ball Stud Seal
9. Piston Body
10.
Piston Rod Seal
11.
Backup Washer
•12.
Scraper Element
13.
Piston Rod Scraper
14.
Snap Ring
15.
Piston Rod
CHEVROLET CHASSIS SERVICE MANUAL
STEERING 9-39
4.
Remove cotter pin, nut and ball stud at relay rod.
5. Remove the power cylinder from the vehicle.
Inspection
1.
Inspect the seals for leaks; if leaks are present,
replace the seals using the procedure outlined under
"Disassembly."
2.
Examine the brass fitted hose connection seats for
cracks or damage and replace if necessary.
3.
For service other than ball seat or seal replacement
and ball stud removal, replace the power cylinder.
4.
Check the frame bracket parts for wear.
Disassembly
1.
To remove the piston rod seal remove the snap ring;
then pull out on the rod, being careful not to spray
oil.
2.
Remove the piston rod scraper and scraper element,
back up washer and piston rod seal from the rod.
3.
At the ball stud end of the cylinder, remove the ball
stud seal.
4.
Remove the snap ring retaining the end plug with the
lube fitting.
5. Push on the end of the ball stud and remove the end
plug, spring, spring seat and ball stud.
6. Remove the "O" ring seal from the top lip of the
power cylinder ball stud opening.
7. If the ball seat is to be replaced, it must be pressed
out using Tool J-8937.
Assembly
1.
Reassemble the piston rod seal components by re-
versing the disassembly procedure. Apply a thin
coat of Lubriplate or equivalent on the inner sur-
faces of the seal and scraper before assembly.
2.
Reverse the disassembly procedure when reassem-
bling the ball stud.
3.
In each case be sure that the snap ring is securely,
seated in the ring groove.
Installation
1.
Install the power cylinder on the vehicle by reversing
the removal procedure.
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.
POWER STEERING HOSES
When servicing the power steering hoses be sure to
align the hoses in their correct position as shown in
Figure 71. On Chevelle models with 396 engine, install
the upper hose so that there is at least .6 inch clearance
between the hose and the Delcotron or the inner fender
skirt.
It is important that the power steering hoses be in-
stalled correctly. Hoses installed out of position may be
subjected to chafing or other abuses during sharp turns.
Always make hose installations with front wheels in
straight ahead position. Do not twist hoses unneces-
sarily during installation.
CAUTION: Do not start engine with any power
steering hose disconnected.
CHEVROLET CHASSIS SERVICE MANUAL
