GMC MOTORHOME 1978 Manual de usuario

Word

The

GMC

Motorhome

Owner

...

Congratulations

your

purchase

of a

GMC

Motorhome

You

have

opened

the

way

endless variety of

happy

holidays

This

manual

has

been

prepared

acquaint

you

with

the

operation

and

maintenance

your

Motorhome,

and

provide

important

safety

information

supplemented

two

convenient

folders

which

provide

additional

information

vehicle

maintenance

and

warranties

urge

you

read

these

three

publications

carefully

the

recommen-

dations

help

assure

the

most

enjoyable

and

troublefree

operation

your

vehicle

While

reading

this

manual

you

will

notice

that

some

specifications

are

given

in both

metric

and

customary

units

Where

precise

accuracy

not

needed,

some

conversions

have

been

rounded

even

numbers

for

your handy

use

Operating

Manual

Appendix

provided

with

vehicles

built

after

January

1978,

which

have

gross

vehicle

weight

rating

(GVWR)

excess

10,000

pounds

This

Appendix

covers

items

relating

com

pliance

with

Federal

noise

emission

standards

and

includes

the

noise

emission

warranty

also

contains

information

maintenance

the

noise control

system

and

lists

acts

which

are

considered

tampering

with

the

system

noted

the

Appendix, tampering

with

the

noise

control

system

prohibited

Federal

Law

When

comes

service,

remember

that

your

GMC

Motorhome

Dealer

knows

your

vehicle

best

Your

dealer

interested

your

com-

plete

satisfaction

Return

him

for

Guardian

Maintenance

Service

and

any

other

repairs

you

may

require

assist

dealers in

handling

your

needs

GMC

Truck

and

Coach

maintains

number

Zone

Offices

throughout

the

country

you

have

problem

that

has not

been

handled

your

satisfaction,

please follow

the

procedure

described

under

the

"Owner

Assistance"

section

Thank

you

for

choosing

GMC

Motorhome

extend

our

best

wishes

for

many

years

of pleasant

traveling

Cordially,

General

Sales

Manager

1978

GMC

MOTORHOME

OPERATING

MANUAL

IMPORTANT

This

manual

should

considered a

permanent

part of the

vehicle

should

remain

with the

vehicle

when

sold,

provide

the next

owner

with

important

safety,

operating

and

maintenance

information

All

information,

illustrations

and

specifications

contained

this

manual

are

based

the

latest

product

information

available

the

time

printing

The

right

reserved

make

changes

any

time

without

notice

For

vehicles

sold

Canada,

substitute

the

name

General

Motors

Canada

Limited

when-

ever the

name

GMC

Truck

Coach

Division

appears

this

manual

Service

Publications

GMC

TRUCK &

COACH

DIVISION

GENERAL

MOTORS

CORPORATION

Pontiac,

Michigan

48053

X-7821

Part

2028572

TABLE

CONTENTS

SUBJECT

PAGE

SUBJECT

PAGE

Important

Information

Cruise

Control

. .

Vehicle

Floor

Controls

. .

Before

Driving

Your

Motorhome

Power

Brake

System

. .

.. ...

. .

Driver

Checklist

. . .

Headlight

Dimmer

Switch

. .

Guard

Against

Theft

. . .

Headlight

"Flicker

. . . .

... ... ..

Inside

Rearview

Mirror

. . .

InstrumentPanel

and

Controls

. .

Outside

Rearview

Mirror

. . .

Speedometer

and

Odometer

. . .

...

Keys

. . . .

. .

. . . . .

. .

Fuel

Gauge

. .

. . . .

. .

Entrance

Door

. . .

. . . . .

Temperature

Gauge

. .

. . . .

. .

Seats

. . . .

Oil

Pressure

Gauge

. .

Head

Restraint

for

Dual

Passenger

Seat

Charging

System

Warning

Light

. .

Belt Restraints

. .

. . . . . .

Brake

System

Warning

Light

. .

Restraint

Pregnant

Women

. .

Tell-Tale

Warning

Light

Cluster

. .

Lap

Belt

Inspection

. . . .

Voltmeter

. . . .

. .

Child

Restraint

Headlight

Switch

. .

Trailer

Towing

10 Windshield

Wiper

Lever

. .

Operation

Foreign

Countries

. . . . .

Windshield

Washers

. .

. . . .

. .

Trip

Tips

.. .

. .

12 Fuel

Selector

Switch

. .

Driving

Tips

Battery

Boost

Switch

. .

Starting

and

Operating

Vehicle

. . . . .

. .

Cigar-Cigarette

Lighter

. .

Engine

Exhaust

Gas

Caution

. . . . . .

Automotive

Heating

and

Air

Conditioning

System

. .

Steering

Column

Controls

Anti-Theft

Steering

Column

Lock

Radios

and

Tape

Player

. .

Guard

Against

Theft

. . .

Mobile

Radio

Systems

. .

Parking

. . .

. .

Electro-Level

System

. .

Starting

the

Engine

. .

Operation

Living

Area

Facilities

. .

. . . .

New

Vehicle

"Break-In"

Period

. .

Living

Area

Facilities

Caution

. .

Automatic

Transmission

Living

Area

Electrical

System

. .

Turn

Signal

Lever

. . .

. .

General

Information

. . . .

. .

HazardWarning

Flasher

. .

120-Volt

12-Volt

Converter

Horn

Control

. .

. . .

. .

and

Battery

Charger

. .

Power

Steering

. . . .

. .

External

Power

. .

Tilt

Steering

Wheel

Lighting

System

. .

. . . .

. .

SUBJECT



PAGE

Monitor

Panel

. . . .

. .

Motor

Generator

. . . .

. .

Exterior

Receptacle

. . . .

. .

Living

Area

WaterSystem

. .

Filling

Water

Tank

. .

External

Water

Connection

. .

Water

Pump

. . . . .

. . . .

. .



Water

Heater

. . . .

. .

Kitchen

Facilities

. .

All-Electric

Refrigerator

. .

PowerRange

Hood

. .

Gas

Kitchen

Range/Oven

Gas

Cook

Top

. .

. . . .

. .

Microwave

Oven

. .

. . .

Kitchen

Sink

and

Faucet

. . .

. .



Water

Treatment

Unit

. .

Bathroom

Facilities

. . .

. .

Standard

Toilet

. . .

. .

. . . .

Recirculating

Toilet

. . . .

. .

Bathroom

Sink

and

Shower

Control

Valve

. .



5 7

Bathroom

Warm

Air

Duct

. .

. . . .



5 7

Bathroom

Exhaust

Vent

and

Fan

. .

Ventilation

. . . .

. .

Windows

. .

. . .

. . . .

. .

. . .

Ceiling

Vents

. .

. . . .

. .

Roof-Mounted

Air

Conditioner

. . .

. .

Emergency

Starting

.. ..

. .

Jump

Starting

. .

TABLE

CONTENTS

SUBJECT



PAGE

Engine

Coolant

. .

. . .

Engine

Coolant Caution

. .

Jack

Usage

Instruction

. . .

. . . .

Towing

. .

. . .

. .

Freeing

Vehicle

From

Sand,

Etc



Rear

Suspension

Failure

. . . .

Emergency

Exit

. .

Fire

Extinguisher

. .

. . . .

Appearance

Care

. . .

. .

.. . .

. .

Care

and

Cleaning

Interior

. .

. . .

. .



Cleaning

Fabrics

(With

Foam-Type

Cleaner)

. . .

Cleaning

Fabrics

(With

Solvent-Type

Cleaner)

. .



Removal

of Specific

Stains

. .



CleaningLeather

Vinyl

Trim

. .



Seat

Belt

Care

. .

. . . .

Glass



Surfaces

. .



Vacuum

Cleaner

. . . .

. .

. . .

Draperies

. . . .

. .

. . . . . .

Kitchen

Sink

. . . .



Power

Range

Hood

Filter

. . . .

Gas

Range/Oven

. . . .

GasCook

Top

. .

. . . .

. .



Microwave

Oven

. . . .

. .

Exterior

Appearance

Care

. .

Washing

. .

Cleaning

White

Sidewall Tires

Underbody

Maintenance

. .

Furnace

. .

Polishing

and

Waxing

. .

Protection

Exterior

Furniture

. .

Bright

Metal

Parts

. . . .

. .

Case

Emergency

. . .

. . . .

. .

Foreign

Material

Deposits

. . . .

Four-Way

Hazard

Warning

Flasher

. .

71 Finish

Damage

. .

SUBJECT



PAGE

Undercoating

. . . .

. .

Appearance

Care

and

Maintenance

Materials

. .

. . . .

Service

and

Maintenance

. . . .

Maintenance

Schedule

NIASE

Mechanic

Certification

. . . . . .

Accessibility

. . . .

. . .

Exterior

Compartments

. . .

. .

. . . .

Engine

Accessibility

. . .

. .

. . .

. . . .

Engine

Compartment

Light

. . . .



Hoisting

Instructions

Lubrication

Details

. .

Engine

. . .

. . . .

Transmission

. .

Final

Drive

. . . .

. . .

. . . . .

Steering

System

. .

. . . .

. . .

BrakeSystem

. . . .

Servicing Details

. . .

. .

Engine

Cooling

System

. . .

EngineFuel

System

. .

101

Carburetor

. . .

. . . . .

. .

.102

Engine

Air

Cleaner

. . .

102

Chassis

Electrical

System

102

Wheels

and

Tires

. . .

104

Wheel

Bearings

108

Front

Suspension

. . .

. . . .

108

TABLE

CONTENTS

SUBJECT



PAGE

Rear

Suspension

. .

109

Gas

System

.. ...

. .

111

Living

Area

Electrical

System

. .

112

Onan

Motor

Generator

Maintenance

116

Standard

Toilet



. . . . . .

. .

118

Recirculating

Toilet

. .

119

Draining

Holding

Tank

. .

120

Draining

Living

Area

Water

System

.120

Water

Tank

Filter

. . .

. .

121

Sanitizing

Living

Area

Water

System



. .

122

Winterization

. . . .

. .

.123

Vehicle Storage

. .

123

Vehicle

Trip

Preparation

. .

125

General Data

and

Specifications

. .

129

Owner

Assistance

. .

137

Zone

Territories

. .

138

Zone

Offices

. .

139

General

Motors

Overseas

Offices

. .

139

Canada

Limited-Zone

Offices

. .

140

After-Hour

Information

Service

. .

141

Emergency

Service

. .

141

Maintenance

Manual

and

Parts

Book

. .

141

Facts

About

Gasoline

Mileage

. .

142

Index

(Alphabetical

)



. . .

. .

143

Gas

Station

Information

. .

Inside

Back

Cover

IMPORTANT

INFORMATION

VEHICLE

OVERLOADING

CAUTION

The

components

your

vehicle

are

designed

provide

satisfactory service

the

vehicle

not

loaded

excess

either

the

Gross

Vehicle

Weight

Rating

(GVWR)

the

maximum

Front

and

Rear

Gross

Axle

Weight

Ratings

(GAWR's)

yThese

ratings

are

listed

the Vehicle

Identification

Number

(VIN)

plate

located

behind

the

right front

access

door

Overloading

can

create

serious

potential

safety

hazards

and

shorten

the

service

life

your

vehicle

Your

dealer

can

advise

you

concerning

proper

conditions

your

vehicle

When

the

Motorhome,

it is

impor-

tant that

it is

properly

loaded

All

items

should

loaded

centrally

and

low

possible

This

essential

maintain

proper

vehicle

handling

Even

though

single

item

may

not

weigh

much

alone,

several

these

items

may

have

considerable

weight

Proper

essential

MAXIMUM

FRONT

AND

REARAXLE

WEIGHTS

(AS

MANUFACTURED)

The

weight

the

cargo

load

must

properly

distributed

over

both

the

front

and

rear

axles

The

VIN

plate

shows

the

maximum

weight

that

the

front

axle

can

carry

(front

GAWR)

and

the

maximum

weight

that the

rear axle

(rear

GAWR)

can

carry

The

GVWR

represents

the

maximum

permissible

loaded weight

the

vehi-

cle

and

takes

into

consideration

the

engine,

transmission,

frame,

suspension,

brake,

axle

and

tire

capabilities

Actual

front

and

rear

end

weights

can

only

bedeterminedby

weighing

the

vehicle

This

can

accomplished

through

high-

way

weigh

stations or

other

such

commercial

facilities

Consult

your

dealer

for

assistance

The

cargo

load

should

distributed

on both

sides

GVWR

RATING

12,500

LBS

FRONT

GAWR

4,500

LBS

REAR

GAWR

8,000

LBS

MAXIMUM

TOTAL

WEIGHT

GROUND

12,500

LBS

*Curb

weight

the

maximum

weight

of the

vehicle

without

driver,

passengers,

cargo,

and

empty

fresh

water,

LP,

and

holding

tanks,

but does

include

fuel

and

coolant

Vehicle

the

centerline

the

vehicle

equally

possible

ALLOWABLE

LATERAL

WEIGHT

VARIATION

The

independent

suspension

this

vehicle

could

adversely

affected

byan

unbalanced

load

either

side

vehicle

The

allowable

front

lateral

weight

variation

250

pounds

The

allowable

rear

lateral

weight

variation

600

pounds

Lateral

weight

variations

excess

the

above,

can

result

abnormal

vehicle

handling

VIN

(Vehicle

Identification

Number)

Plate

Your

VIN

plate

shows

the

GVWR

and

the

front

and

rear

GAWR's

for

your

vehicle

GENERAL

MOTOR

CORPORATION

WARRANTY

MAY

VOIDED

WEIGHT

EXCEEDS

ANY

RATINGS

SHOWN

GROSS

VEHICLE

WEIGH

INCLUDES

WEIGHT OF BASE

VEHICLE,

ALL

ADDED

EQUIPMENT,

DRIVER

AND

PASSENGERS,

AND

ALL

PROPERTY

LOADED

INTO

OR ONTO

VEHICLE

GROSS

VEHICLE

WEIGHT

FOR

THIS

VEHICLE

MAXIMUM

FRONT

END

WEIGHT

ATGROUND

MAXIMUM

REAR

END

WEIGHT

GROUND

VEHICLE

IDENTIFICATION

RATINGS

POUNDS

MANUFACTURED

Vehicle

Identification

Plate

EFFECT

WARRANTY

TIRES

For

continuing

satisfaction

keep

your

vehicle

all

General

Motors

Parts

are

identified

one

of these

trademarks

Delco

Gross

Vehicle

Weight

(GVW)

the

weight

the

originally

equipped

vehicle

and

all

items

added

the

vehicle

after

has

left

the

factory

This

would

include the

driver

and

all

occupants,

and

everything

that

loaded

into

(or

onto) the

vehicle

The

GVW

must

not

exceed

the

GVWR

Also,

the

front

and

rear

weights

the

loaded

vehicle

must

not

exceed

the

front

and

rear

GAWR's

CAUTION

Luggage

other

cargo

should

secured

place,

This

will

help

keep

such

things

from

being

thrown

about

and

injuring

people

the

vehicle

accident

Your

New

Vehicle

Warranty

does

not

apply

any

part

your

vehicle

"which

has

been

subject

misuse

Any

part

which

fails

because

over-

has

been

subject

misuse

The

tires

your

vehicle

should

the

proper

size

and

properly

inflated

important

avoid

over-inflation

well

under-inflation

See

the

SERVICE

AND

MAINTENANCE

sec-

tion

for

proper

tire

inflation

pressures

BEFORE

DRIVING

YOUR

MOTORHOME

DRIVER

CHECK

LIST

BEFORE

ENTERING

VEHICLE

See

that

windows,

mirrors,

and

lights

are

clean

Check

whether

any

tire

low

flat

(You

may

need

check

wtih

gauge

tell

radial

tires

are

properly

inflated

Check

that

all

exterior

lights

work

Look

for

fluid

leaks

Turn

off

gas

valve

tank (See

CAUTION

under

"LP

Gas

System"

SER-

VICE

AND

MAINTENANCE

section)

Check

that

sewer

connection,

all

external

compartments,

and

filler

openings

are

prop-

erly

stowed

closed

and/or

locked

Check

that

items stored

exterior

ve-

hicle

are

securely

lashed

Will

any

items

stored

exterior of

vehicle

present a

clearance

problem?

Are

there

any

rocks,

posts,

low-hanging

lines

branches

under

near

the

vehicle

you

must

avoid

before

driving

away?

Check

area

behind

vehicle

about

to back-

BEFORE

DRIVING

OFF

Lock

entrance

door

Check

that

all

windows

are

suitable

position

for

travel

(See

"Engine Exhaust

Gas

Caution

(Carbon

Monoxide)

the

beginning

STARTING

AND

OPER-

ATINGVEHICLE

section

all

roof

vents

Turn

off

living

area

water

pump

Check

that

refrigerator

door

fastened

Check

that

nothing

heavy

stored

over-

head

high

cabinets-it

may

fall

out

en-

route

and

cause

injury

sure the

gun,

ammunition,

and

fishing

equipment

cabinets

are

locked,

vehicle

equipped

and

secure

bathroom,

closet,

and

all

cabinet

doors

and

drawers

Check

that

counter

tops,

range

top,

kitchen

sink,

table

tops

and

shelves

are

clear-even

small

items

may

become

projectiles

accident

not

safe

cook

while

under-

way-hot

food

or liquid

may

scald

sud-

den

stop

accident

sure

all

gas

controls

furnace,

range/oven

and

gas/electrical

refrigerator

(if

equipped)

are

turned

off

Check

that

all

interior

stowage

securely

held

Check

that

all

lights

and

switches

are

set

positions suitable

for

travel

Adjust

driver's

seat

for

comfort

Check

that

driver's

and

front

passenger's

seat,

and any

other

swivel-mounted

seats

are locked

position

Adjust

inside

and

outside

mirrors

Adjust

curtains

where

necessary

for

visibility

vehicle

equipped

with

optional

Electro-

Level

System

II,

check

that

TRAVEL

switch

positioned

"AUTO"

Switch

should

moved

"HOLD"

after

minutes

Fasten

belt

restraints

Check

that

warning

light

bulbs

light

when

key

turned

"ON"

"START"

position

17,

Check

all

gauges

Release

parking

brake,

and

see

that

the

"PARK

BRAKE"

light

turns

off

With

engine

running,

check

that

warning

lights

are

now

out

sure

you

know

your

vehicle

and

how

operate

and

its

system

and equipment

safely

recommended

that

you

refer

"TRIP

TIPS"

and

"DRIVING

TIPS"

the

end

of this

section

for

additional

information

CAUTION

Counter

and

table

tops

should

not

used

for

storage

when

underway-even

for

light

weight,

small

articles

They

might

become

dangerous

projectiles

dur-

ing

accident

Heavy

items

stored

overhead

waist-high

cabinets

may

also

cause

injury

sharp

turn or

stop

causes

them

topple

against

inside

cabinet

door,

forcing

open

Store

canned

goods

and

other

heavy

items

down

low

sure

the

gun,

ammuni-

tion,

and

fishing

equipment

cabinets

are

locked,

vehicle

equipped

GUARD

AGAINST

THEFT

For

tips

how

protect

your

vehicle

and

its

contents, see the

"Steering

Column

Controls"

section

this

manual

Inside

Rearview

Mirror

INSIDE

REARVIEW

MIRROR

The

mirror

can

adjusted

up,

down,

side-

ways

obtain the best

view

the

front

and

rear

Move

the

mirror

lever

the

night

position

reduce

glare

from

headlights

vehicles

be-

hind

you

OUTSIDE

REARVIEW

MIRROR

Adjust

the

outside

mirror

you

can

just

see

the

side of

your

vehicle

the

side of

the

mirror

closest

to the

vehicle

KEYS

Two

different

keys

are

provided

for

the

locks

on your

VEHICLE

The

key

code

stamped

DOOR

LATCH

Entrance

Door

Latch

the

"knock

out"

plug

each

key

head

Key

with

square

head

(letter

"J")-for

igni-

tion lock

only

Key

with

oval

head

(letter

"K")-for

all

other

locks

For

vehicle

security

Recordkey

code

numbers

;

then

knock

plugs

out

keys

Keep

the

key

codes

safe

place

such

your

wallet,

NOT

THE

VEHICLE

the

original

keys

are

lost,

duplicates

can

made

using the

key

codes

Contact

any

dealer

your

locksmith

you

park

attended

lot,

separate

and

leave

your

square

ignition

key

only

Lock

your

glove

box

(also

all

other

compartments

with

key

locks)

and

take the

round

key

with

you

This

will

help prevent

any

illegal

entry

into

the

glove

box

any

other

compartments

with

locks

the

refrigerator

equipped

with

lock,

third

key

will

provided

ENTRANCE

DOOR

Doormust

locked

from

outside

the

vehicle

inserting

the

key

into

the door

key

lock

and

turning

unlock,

turn

the clockwise

direc-

tion

Reverse

the

direction

lock

door

from

inside

vehicle,

push

the

lock

button

DOWN

unlock

and

open

door

from

the

inside,

pull

the

lock

button

and

pull

inside

door

handle

Seat

Track

Mechanism

(Typical)

CAUTION

For

safety's

sake,

always

lock

the en-

trance

door

when

driving

This

pro-

vides

greater

safety

accidents,

and

helps

keep

children

from

opening

the

door

also

helps

keep

out

intruders

when

stopped

for

lights,

etc

SEATS

DRIVER

AND

FRONT

PASSENGER

SEATS

The

driver

and

front

passenger

seats

may

adjusted

suit

individual's

preference

move

seat

forward

backward,

simply

re-

lease

the

seat

locking

lever

located

the

aisle

side

the

seat

Once

released,

exert

slight

body

pressure

the

direction

desired

Release

lever

lock

the

seat

the

desired

position

The

seats

can be

swiveled

provide

easy

entrance

and

exit

swivel

seat,

depress

seat

swivel

lever

(as

shown), then

rotate

seat

The

seats

are designed

to lock

only

the

forward

facing

position

CAUTION

After

adjusting

manually

operated,

seat,

push

-forward

and

backward

seat

and

twist

seat

sure

the

seat

adjusters

and

swivel

lock

have

latched

Movement

the

seat

indicates that at

least

one

latch

the

lock

did

not en-

Seat

Swivel

Mechanism

(Typical)

gage

This

could

increase

the

chance

injury

and/or

the

amount

injury

accident

Take

the

vehicle

your

dealer

for service

you

find

that

your

seat

adjusters

not

latch

not

adjust

a manually

operated

driver's

seat

swivel

fore

and

aft

lever

while

the

vehicle

moving

The

seat

could

move

suddenly

and

could

cause

the

driver to lose control

the

vehicle

Dual

Passenger

Seat

Swivel

Mechanism

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