Chevrolet Light Duty Truck 1973 Service Manual page 10

0 -4 GENERAL IN F O R M A T IO N A N D LUBRICATIO N
PUSH STARTING
If your truck is equipped with a manual 3-speed or
4-speed transmission, it can be started in an emergency
by pushing. When being pushed to start the engine, turn
off all unnecessary electrical loads, turn ignition to
"O N ," depress the clutch pedal and place the shift lever
in high gear. Release the clutch pedal when speed
reaches 10 to 15 miles per hour. Bumpers and other parts
contacted by the pushing vehicle should be protected
from damage during pushing. Never tow the truck to
start.
TOWING
All Except Four Wheel Drive Trucks
Normally your vehicle may be towed with all four wheels
on the ground for distances up to 50 miles at speeds of
less than 35 MPH. The engine should be off and the
transmission in neutral.
However, the rear wheels must be raised off the ground
or the drive shaft disconnected when the transmission is
not operating properly or when a speed of 35 MPH or
distance of 50 miles will be exceeded.
I f a truck is towed on its front
CAUTION:
wheels only, the steering wheel must be secured
with the wheels in a straight ahead position.
Four Wheel Drive Trucks
It is recommended that the truck be towed with the front
wheels off the ground. The truck can be towed, however,
with the rear wheels off the ground if there is damage in
the rear wheel area. In this event, the transmission
selector lever should be placed in the "N " (neutral)
position and with conventional four wheel drive the
front drive disengaged. With Full Time four wheel drive
the transfer case should be in high. Towing speeds
The first column of the Load Capacity Chart on the
following pages shows the basic model series.
The next column reflects the wheelbases available within
each series.
The third column shows the Gross Vehicle Weight
(GVW) rating applicable to each series vehicle. GVW
means the maximum design weight of the vehicle
including the vehicle itself and all equipment added to
the vehicle after it has left the factory, the driver weight
and occupant weight and everything that is loaded into
or onto the vehicle.
Following the GVW columns are the minimum
recommended tires to qualify the vehicle for each GVW
rating.
LOAD CAPACITY Ch
should not exceed 35 MPH for distances up to 50 miles.
If truck is towed on its front wheels, the steering wheel
should be secured to keep the front wheels in a straight­
ahead position.
When towing the vehicle at slow speeds (approx. 20
MPH), for a very short distance only, the transmission
must be in NEUTRAL and with conventional four wheel
drive the transfer case
With Full Time four wheel drive the transfer
H IG H " .
case should be in high.
When towing the vehicle at faster speeds for greater
distances, the following steps MUST be taken:
• If front wheels are on the road, disconnect the front
drive shaft.
• If rear wheels are on the road, disconnect the rear
drive shaft.
STEEL TUBING REPLACEMENT
In the event that replacement of steel tubing is required
on brake line, fuel line, evaporative emission, and
transmission cooling lines, only the recommended steel
replacement tubing should be used.
Only special steel tubing should be used to replace brake
line. That is, a double wrapped and brazed steel tubing
meeting G.M. Specification 123 M. Further, any other
steel tubing should be replaced only with the released
steel tubing or its equivalent. Under no condition should
copper or aluminum tubing be used to replace steel
tubing. Those materials do not have satisfactory fatigue
durability to withstand normal vehicle vibrations.
All steel tubing should be flared using the upset (double
lap) flare method which is detailed in Section 5 of this
Manual.
\T INTERPRETATION
The tire pressures listed in the column adjacent to the
tire sizes in the chart are the minimum required tire
pressures for maximum permissible loads.
The letter under the Front and Rear Axle and Spring
columns indicates that base equipment is satisfactory to
qualify the vehicle for any given GVW rating. When the
letters "RPO" denoting Regular Production Option,
followed by a number appears in these columns
(example RPO G50), the vehicle must be equipped with
the extra cost equipment specified by the RPO to qualify
the vehicle for the given GVW rating.
In loading the vehicle, the combined front and rear end
weights at the ground must not exceed the GVW
specified for the vehicle as manufactured.
be in
M UST "T W O WHEEL
LIGHT DUTY TRUCK SERVICE MANUAL