Chevrolet 1948 light duty Manual de usuario

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, /

• I

, ,

LIGHT

and

HEAVY

" I ,

DUTY

TRUCKS

, . , I

OPERATOR'S

MANUAL

FOR

1948

Chevrolet Light

and

Heavy

Duty

·Trucks

INTRODUCTION

Whim y

pur

hased

your

new

Chevrolet

truck

was

siness

investment

your

part.

You

can

rightl

expect

pay

divid

nds

investment

handling

your

hauling

and

transportation

requirements.

rolet

tru

cks

are

igned

handl

maximum

loads effi-

ciently

and

economically,

provid-

ing

they

are

given

the

care

and

consid

ration

due

any

fine

piece

machin

subjected

severe

operating

conditions.

This

booklet has

been

prepared

give

you

information

pertaining

the

driving,

care

and

mainte-

nanc

e of

your

truck

well

provide

technical

data

that

may

be of v

alue

interest

you.

The

ubject

index

the

right

is a

ready

reference

the

key

subjects

and

will

enable

you

find

any

subject

covered

the

booklet

Chevrolet Motor Division

General

Motors

Corporation

Detroit

Mi~l'an

SUBJECT INDEX

Driver

Operatin(

Information

Page

Breaking-in

Period.

.......... 3

Controls

and

struments

estartin

Inspect

.......

Starting

thelngine

....

GearsMbn

g .

Cold

Weather

OperatIOn.

Hot

Weather

Operation

... .,.. .

Tire

Inflation.

........

ool

......

Description,

Care

and

Maintenance

Preventive

ntenance

...

Engine

Cooling

System

Clutch

Transmission

Rear

Axle

hont

Axle

.. .

Steering

Brake

stem..

....

.. .

prings

and

Sha

ckl

Electrical

System

...

Tires

Lubrication

Eng

e.. .

Rear

Axle

and

Transmiss

Universal

Joints

.. ..'

Front

Wheel

Bearings

Wheel

Bearings

Chassi

s.. .

Hints

for

Lot:ating

Road Troubles

Engine

...

Ughts

General.

.....

General

Information

Manufacturer

Warranty

...'

Tire

Warranty

.. .

...

Owner's

ice

licy..

Service

ties

.. .

...

Labor

Charges

and

Repa

Technica1

Data

Unit

Capac

Chart

.. ... ... !Il

lamp

Bulb

Chart

...

... !Il

Specificat

... .

Adjustment

Specifications

....

load

Capacily

Chart.

.........

1ig. J

-Controls

and

'nstrumenfs-

'12

and

'I.

Ton

CHAPTER I

DRIVER'S

OPERATING

INFORMATION

BREAKING-IN PERIOD

The

moving

parts

your

Chevrolet

truck are preCISlon

built

very

close fits.

For

this

reason

high

speeds

should

avoided

and

special

attention

given

proper

lubrication

for

the

first 2,000 miles.

properly

break

the

moving

parts

and

assure

long

care-

free

service

not

drive

faster

than:

35 miles

per

hour

for

the

first 100 miles

miles

per

hour

for

the

200 miles

50 miles

per

hour

for

the

200 miles

Continuous

high

speed

driving

should

avoided

until

the

truck

has

been

driven

2,000 miles.

The

engine

should

not

raced

run

high

speed

lower

gears, especially

until

thoroughly

warmed

up.

Fig.

2-Conlrols

and

Instrumenls-I-I

'12

and 2

Ton

• 3 •

CONTROLS

AND

INSTRUMENTS

The

type,

location

and

operation

instruments

and

con-

trols

vary

different

models

and

makes

vehicles;

therefore,

regardless

the

experience

owner

or driver

may

have

had

·is advisable

familiarize one's -self

with

the

instruments

and

controls,

and

their

use

before

driving

this

new

truck.

The

locations

the

various instruments and controls are

shown

figures 1

and

Instrument Group

Gasoline

Gauge.

The

electrically

operated

gasoline

gauge

the

upper

left

side

the

instrument

group

(fig.

3).

wired

through

the

ignition switch;

therefore,

only

indicates

the

Fig.

3-lnstrument

Group

amount

fuel

the

tank

when

the

ignition

switch

turned on.

Temperature

Indicator.

The

water

temperature

indicator

the

lower

left

side

the

instrument

group

(fig.

3).

is,

effect, a

ther-

mometer

with

the

operating

bulb

located

the

water

jacket

the

left

rear

corner

the

cylinder

head.

Normally

this

thermometer

will

between

140

and

180

degrees

when

the

engine

thoroughly

warmed

up.

The

driver

should

watch

this instrument closely, as a

quick

rise

tem-

perature

usually

indicates

trouble.

Should

the

temperature

rise

above

200

degrees

the

engine

should

stopped

and

check

made

for cause

overheating

(see

"Hints for Locating

Road

Troubles,"

page

85).

NOTE:

not remove the radiator

~ap

when engine

exces-

sively hot, do

not

put

water

a hot engine and do

not

run

en-

gine when indicator is above

212

degrees.

Ammeter

(Battery

Indicator).

The

ammeter

the

right

upper

instrument

the

group

(fig.

3).

The

ammeter

indicates

the

flow of

current

and

from

the

battery,

except

the

current

taken

the

starting

motor.

When

the

engine

turned

off

idling

and

any

the

electrical

equipment

is in

use,

it is

• 4 •

natural

for

the

ammeter

show

discharge.

When

the

engine

running

medium

speed

and

most

the

electrical

equip-

ment

turned

off

the

ammeter

should

show

slight

charge,

depending

the

state

charge

the

battery.

Should

the

ammeter

show

discharge

when

the

truck

being

driven

medium

speed,

trouble

indicated

the

charging

system

and

the

battery

will

soon

become

discharged.

Oil

Pressure

Gauge.

This

instrument

the

lower

right

side

the

instrument

group

(fig.

3).

The

oil

pressure

gauge

indi-

cates

whether

not

the

oil

pump

working,

but

does

not

indicate

the

amount

oil

the

crankcase.

The

pressure

gauge

reading

controlled

the

engine

speed

and

the

oil

being

used.

low

reading

normal

idling

speeds

with

warm

engine

and

light oil;

however,

the

engine

speed

increased

the

hand

should

move

over

near

the

"15"

mark.

cold

weather

(especially

with

heavy

oil)

the

hand

may

move

over

the

"30"

mark

at comparatively

low

engine

speeds.

This

indicates

that

the

oil

too

heavY

properly

lubricate

the

engine.

NOTE: Do not accelerate the engine

excessively

until

the

oil

suffi-

ciently warm to permit a lower pres-

sur~.

the gauge does not show

any

pressure, stop

the

engine im-

mediately and determine the cause.

Speedometer.

The

speedometer

located

the

right

the

instru-

ment

group

(fig.

4).

the

vehicle

Fig.

4-Speeclomefe,

driven,

the

hand

moves

around

the

dial

indicating

the

speed

the

vehicle

miles-per-hour.

The

figures

visible

through

the

opening

near

the

center

the

speedometer

indicate

the

total

mileage

the

truck

has

been

driven.

This

part

the

speedometer

known

the

odometer.

Fig.

5-lgnifion$wltch

Switches

Ignition

Switch.

The

ignition

switch,

located

near

the

bottom

the

in-

strument

panel

the

right

the

steering

column

(fig.

5),

used

• 5 •

"make"

and

"break"

the

ignition

circuit

when

starting

stop.-

ping

the

engine.

There

are

two

"off" positions,

one

the

right

and

one

the

left

the

"on"

(vertical)

position.

The

key

can

removed

with

the

ignition

switch

any

the

three

posi-

tions.

When

the

ignition

turned

off

turning

the

switch

clockwise

and

the

key

removed

the

ignition

can

turned

"on" or "off"

without

the

use

key.

When

the

ignition is

turned

off

turning

the

switch

counterclockwise

and

remov-

ing

the

key

the

ignition

locked

"off".

Fig.

6-1ighting

Switch

Lighting

Switch.

The

Lighting

switch,

located

the

left

the

in-

strument

group

(fig. 6)

controls

the

instrument

lamps, headlamps, park-

ing

lamps

and

tail

lamp.

When

this

switch

pulled

out

the

first "on"

position

the

parking

lamps

and

tail

lamp

are

lighted.

When

the

switch

pulled

out

the

last

position

the

headlamps

and

tail

lamp

are

lighted.

Current

for

the

lighting

circuits

passes

through

thermal

circuit

breaker

located

the

light-

ing

switch

behind

the

instrument

panel.

case

all

lights

fail

operate

check

for

trouble

the

thermal

circuit

breaker.

The

instrument

lights

can

dimmed

turned

off

turning

the

light

switch

button

clockwise.

Dimmer

Switch.

The

dimmer

switch

located

the

toe-board

the

left

clutch

pedal

(fig. 10) is

used

switch

the

head-

lamp

beam

from "high"

"low" or "low"

"high".

Each

time

the

switch

depressed

the

light

beam

reversed.

headlamp

beam

indicator

located

between

the

and

the

bottom

speedometer.

When

the

lights

are

upper

beam

red

light

is visible

through

the

in-

dicator opening.

Avoid

use

upper

beam

when

meeting

other

vehicles

the

highway

city

traffic.

Dome

Lamp

Switch.

The

dome

lamp

switch

located

the

left

end

the

dome

lamp

assembly

directly

above

the

rear

window

(fig.

7).

Moving

this

switch

backward

turns

• 6 •

Fig.

7-Dome

Light and

Switch

the

light

and

moving

forward

turns

the

light

off.

Horn

Button.

The

horn

button

conveniently

located

the

center

the

steering

wheel.

Depressing

the

button

blows

the

horn.

Controls

Hand

Throttle

Control.

The

throttle

control

knob

located

the

in-

strument

panel

directly

above

the

ignition

switch

(fig.

8).

Pulling

out

the

control

knob

opens

the

car_

fig,

8-Throtfle

and

Choke

Controls

buretor

provide

uniform

engine

speed

above

the

idle

set..:.

ting.

generally

advisable

pull

the

hand

throttle

control

out

slightly

when

starting

the

engine,

especially

the

engine

has

tendency

stall

time

two

after

starting.

Choke

Control.

The

carburetor

choke

control

knob

located

directly

above

the

hand

throttle

control

knob

(fig.

8).

The

purpose

this

control

(or

partly

close)

the

carbu-

retor

choke

valve

restricting

the

air

intake

and

producing

richer

fuel

mixture

for

starting.

When

the

engine

warm

and

the

weather

warm,

should

not

necessary

use

the

choke

when

starting

the

engine.

When

necessary

use

the

choke

for

starting,

should

pushed

part

way

soon

the

engine

starts

and

all

the

way

soon

the

engine

will

run

smoothly

without

its

use.

CAUTION: Excessive

use

the

choke

will

provide

fuel

mix-

ture

too

rich

burn.

Some

this

unburned

fuel

will

leak

past

Fig.

9-Starter

and

Accelerafor

Pedals

the

pistons

and

dilute

the

engine

oil

and

result

improper

lubrica-

tion,

excessive

engine

wear

and

poor

performance.

Starter

Pedal.

The

starter

pedal

located

near

the

center

the

toe

board

the

right

the

accelerator

pedal

(fig.

9).

Depressing

this

pedal

with

the

foot

engages

the

starting

motor

pinion

with

the

teeth

'the

• 1 •

engine

flywheel

and

closes

the

starter

switch

provide

electrical

circuit

between

the

battery

and

starting

motor,

there-

cranking

the

engine.

The

starting

motor

draws

considerable

current

from

the

battery;

therefore,

should

not

operated

for

than

15 seconds

a time.

the

engine

does

not

start,

locate

the

cause

and

correct

before

the

battery

run

down.

CAUTION:

The

starter pedal must be released as soon as the

engine starts and should

never

be depressed

when

the engine

running or serious damage may result.

Accelerator

Pedal.

The

accelerator

pedal,

located

the

left

the

starter

pedal

(fig.

9),

used

open

and

the

Fig. J

o-ell/reh

and

Brake

Pedals

carburetor

throttle

valve.

The

driver

rests

his

right

foot

this

pedal

and

varying

the

pressure

applied

opens

the

carburetor

throttle

the

correct amount

obtain

the

desired

engine

vehicle

speed.

Clutch

Pedal.

conveniently

located

for

use

the

driv-

er's

left

foot (fig. 10).

used

engage

and

disengage

the

clutch,

thereby

connect-

ing

the

engine

to or disconnecting it from

the

transmission and

drive

line

to rear

wheels.

The

clutch

pedal

should

have

inch

free

travel;

if less

than

adjust

free

travel

(see

Clutch

Adjustment,

page

41).

NOTE:

Never

drive with the foot resting on the clutch pedal as

this produces

undue

wear

the throwout bearing and other

parts.

Brake

Pedal.

Located

the

right

clutch

pedal

(fig.

10).

Depressing

this

pedal

applies

the

hydraulic

service

brakes

all

four

wheels

proportion

the

pressure

applied

on.

the

pedal.

Hand Brake

Lever-I-I¥.

and 2 Ton.

Extends

through

floor

the

right

the

gear

shift

lever

with

the

grip

just

below

the

instrument

panel

(fig.

2).

Pulling

this

!ever

back

applies

the

rear

wheel

brakes

means

mechanical

linkage

entirely

independent

the

hydraulic

system.

release

brakes,

grip

• 8 •

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