Chevrolet 10 Series 1968, Service Manual, Page: 683 / 713

ACCESSORIES 15-9
CLU TC H C RU IS E E N G A G E M E N T
SW IT CH R ELE A SE S W IT CH
WHITE
REGULATOR
F ig . 11—Vacuum and E le ctrica l Diagram
Installation
1. Once a new switch is installed, pull it back into the
lever by pulling on the harness at the lever slot.
2. Reinstall retaining ring and button.
3. Push wire slack into turn signal housing; reinstall
turn signal lever and steering wheel.
4. Connect battery ground cable.
SERVO
Service
— If the Servo unit is found to be defective, re ­
placement is required. Note the condition of the hoses
and replace any which are cracked or deteriorated.
Adjustment
— Adjust the bead chain so that it is as tight
as possible without holding the throttle open when the
carburetor is set at its lowest idle throttle position.
When connecting the bead chain (engine stopped) manually
set the fast idle cam at its lowest step and connect the
chain so that it does not hold the idle screw off the cam.
If the chain needs to be cut, cut it three beads beyond the
bead which pulls the linkage.
REGULATOR
Maintenance
— A defective regulator, that is one which
is not simply out of adjustment, must be replaced. During
replacement, check the hoses which connect to the regu­
lator and replace any which are cracked or deteriorated.
Air Filter
The air filter located in the solenoid cover should be
replaced every 12,000 miles.
1. Snap the solenoid cover off.
2. Replace the filter.
3. Attach the cover with neoprene seal to the solenoid
housing. Be certain that the cover fits tightly to the
housing.
Adjustment
One regulator adjustment is possible: Engagement-
Cruising Speed Zeroing (to remove any difference be­
tween engagement and cruising speed).
NOTE: No regulator adjustment should be
made, however, until the following items have
been checked or serviced.
1. Bead chain properly adjusted.
2. All hoses in good condition, properly attached, not
leaking, not pinched or kinked.
3. Regulator air filter serviced as per the above
recommendations.
4. Electric and vacuum release switches properly
adjusted.
5. Check speedo cables for proper installation.
Engagement—Cruising Speed Zeroing
If the cruising speed is lower than the engagement
speed, loosen the orifice tube locknut (See Figure 8) and
turn the tube outward; if higher, turn the tube inward.
Each 1/8 turn will alter the engagement-cruising speed
difference one mph. Tighten the locknut after adjustment
and check the system operation at 50 MPH.
CHEVROLET TRUCK SERVICE MANUAL