Chevrolet 10 Series 1968, Service Manual

Page: 509 / 713

CLUTCHES AND TRANSMISSIONS 7-46
COLUMN SHIFT
1. The shift tube and lever assembly must be free in
the mast jacket. See Section 9 for alignment of
steering column assembly if necessary.
2. To check for proper shift linkage adjustment, lift the
transmission selector lever towards the steering
wheel. Allow the selector lever to be positioned in
drive (D) by the transmission detent.
NOTE: Do not use the indicator pointer as a
reference to position the selector lever. When
performing linkage adjustment, pointer is ad­
justed last.
3. Release the selector lever. The lever should be
inhibited from engaging low range unless the lever
is lifted.
4. Lift the selector lever towards the steering wheel
and allow the lever to be positioned in neutral (N) by
the transmission detent.
5. Release the selector lever. The lever should now be
inhibited from engaging reverse range unless the
lever is lifted.
6 . A properly adjusted linkage will prevent the selector
from moving beyond both the neutral detent, and the
drive detent unless the lever is lifted to pass over
the mechanical stop in the steering column.
7. In the event that an adjustment is required, place the
selector lever in drive (D) position as determined by
the transmission detent. See Steps 2 and 3.
8 . Loosen the adjustment swivel at the mast jacket, and
rotate the transmission lever so that it contacts the
drive stop in the steering column.
9. Tighten the swivel and recheck the adjustment. See
Steps 2 and
6
.
10. Readjust indicator needle if necessary to agree with
the transmission detent positions. See Section 9.
11. Readjust neutral safety switch if necessary to pro­
vide the correct relationship to the transmission de­
tent positions. See Section 12.
12. When properly adjusted the following conditions must
be met by manual operation of the steering column
shift lever:
a. From reverse to drive position travel, the trans­
mission detent feel must be noted and related to
indicated position on dial.
b. When in drive and reverse positions, pull lever
rearward (towards steering wheel) and then re­
lease. It must drop back into position with no
restrictions.
DETENT SWITCH ADJUSTMENT
Adjust Switch as Shown on Figure 4T
NEUTRAL SAFETY SWITCH ADJUSTMENT
The neutral safety switch must be adjusted so that the
car will start in the park or neutral position, (neutral
position only on 30 Series models), but will not start in
the other positions. For replacement refer to Section 12
of this manual.
DRAINING AND REFILLING TRANSMISSION
Drain oil immediately after operation before it has had
an opportunity to cool.
To drain oil proceed as follows:
1. Remove bottom pan attaching screws, pan, and
gasket.
2. Remove oil strainer retainer bolt, oil strainer, in­
take pipe assembly and intake pipe to case “ O” ring.
Discard the oil strainer and pipe to case
“ O”
ring.
3. Install new “ O” ring seal on intake pipe and place
pipe assembly into grommet on new strainer
assembly.
4. With
“ O”
ring on intake pipe, install pipe and
strainer assembly into case, attaching strainer to
control valve assembly with the retainer bolt.
5. Thoroughly clean bottom pan.
6
. Affix new gasket to bottom pan with petroleum jelly.
7. Install bottom pan with attaching screws and torque
to specifications.
8 . If only the pan has been removed, pour approximately
7-1/2 pints of fluid into the transmission. If the
valve body has also been removed use 9-1/2 pints.
After a complete overhaul approximately 19 pints are
required. Be sure container, spout, or funnel is
clean.
9. Start engine and let idle (carburetor off fast idle
step). Place selector lever in P position (N position
on 30 Series Trucks) and apply hand brake.
10. With transmission warm (approximately 180°F.), add
fluid to bring level to full mark on indicator.
With transmission at room temperature (approx. 70°F.)
add fluid to bring level to 1/4 inch below add mark.
CA U TIO N : Do not overfill. Foaming will result.
PRESSURE REGULATOR VALVE
Rem oval
1. Remove bottom pan and strainer.
2. Compress regulator boost valve bushing against
pressure regulator spring and remove snap ring,
using J-5403 pliers.
3. Remove regulator boost valve bushing and valve,
4. Remove pressure regulator spring.
5. Remove regulator valve, spring retainer, and
spacer(s) if present.
Installation
Installation of the pressure regulator valve is the re­
verse of the removal.
Adjust oil level.
CONTROL VALVE BODY
Rem oval
1. Remove bottom pan and strainer.
2. Disconnect solenoid lead from connector terminal.
3. Remove control valve body attaching screws and de­
tent roller spring assembly.
NOTE: Do n ot remove solenoid attaching
screws.
4. Remove control valve body assembly and governor
pipes. If care is taken in removing control valve
body the six (
6
) check balls will stay in place above
the spacer plate.
CA U TIO N : Do not drop manual valve.
5. Remove the governor pipes and manual valve from
control valve body.
CHEVROLET TRUCK SERVICE MANUAL