Gmc ZEO6083 1974 User Manual

GMC

COMMERCIAL

TRANSMODE VEHICLE

X-7 5 80A

OPERATING MANUAL

MODELS ZE06083 AND ZE06583

IMPORTANT OPERATING, SAFETY AND MAINTENANCE INSTRUCTIONS

A WORD TO GMC OWNERS

. . .

This manual has been prepared to acquaint you with the operation and maintenance of only the chassis and body components of your Commercial TransMode Vehicle, and to provide important safety information

. It is supplemented by con-

venient folders which provide additional information on vehicle maintenance, emission control, and warranties

. We urge you to read these publications carefully and follow the recommendations to help assure the most enjoyable and troublefree operation of your vehicle

When it comes to service, remember that your GMC MotorHome dealer

knows your chassis and body components best and is interested in your complete

satisfaction ance you may require

. Return to him for Guardian Maintenance Service and any other assist-

GMC Truck and Coach maintains a number of Zone Offices throughout the

country nels, follow the procedure presented in Section 6 of this manual under the

"Owner Assistance"

. Should you have a problem that cannot be handled through normal chan-

heading,--

We would like to take this opportunity to thank you for choosing a GMC

product-and assure you of our continuing interest in your motoring pleasure and satisfaction

GMC Truck & Coach Division

FOR

CONTINUING ALLGM. ONE OF THESE TRADEMARKS

GENERAL MOTORS PARTS ARE IDENTIFIED BY

SATISFACTION,

KEEP

YOUR

VEHICLE

GMC COMMERCIAL TRANSMODE VEHICLE

Operating Manual

This manual should be considered a permanent part of the vehicle, and must

remain with the vehicle at time of resale

For vehicles sold in Canada, substitute the name General Motors of

Canada Limited, wherever the name GMC Truck and Coach Division appears

in this manual

All information, illustrations and

are based on the latest product information available at the time of publication

. The right is reserved to make changes at any time without notice

specifications

contained in this manual

GMC Truck & Coach Division General Motors Corporation Pontiac, Michigan 48053

Section

Before Starting Your Vehicle

Starting and Operating Vehicle

Steering Column Controls

Floor Controls

Instrument Panel and Controls

In Case of Emergency

Appearance Care

Service and Maintenance

6 Specifications, Owner Assistance, Index, Gas Station Information

General Motors Corporation

1974

Page

IMPORTANT INFORMATION

ON VEHICLE LOADING

OVERLOADING

MAXIMUM FRONT AND REAR AXLE WEIGHTS (AS MANUFACTURED)

CAUTION

The components of your vehicle are designed to provide satisfactory service if the vehicle is not loaded in excess of

either the Gross Vehicle Weight Rating

(GVWR) or the maximum Front and Rear Gross Axle Weight Ratings (GAWR's)

specified on the vehicle identification

number plate

. Overloading can create serious potential safety hazards and can also shorten the service life of your vehicle

. Your dealer can advise you concerning proper loading conditions your vehicle

GVWR

RATING

FRONT

4,200

GAWR

LBS

distributed over both the front and rear axles, although not necessarily evenly

the maximum weight that the front axle can carry (front GAWR) and the maximum weight that the rear axle (rear GAWR) can carry GVWR represents the maximum permissible loaded weight of the vehicle the manufacturer taking into consideration the

engine, transmission, frame, brake, axle and tire capabilities

the ground can only be determined by weighing the vehicle

highway weigh stations or other such commercial facilities sult your dealer

The

10,500

weight

the

load

must

be properly

. The plate shows

. The

. It is established by

. Actual front and rear end weights at

. This can be accomplished through

. For assistance in this regard, con-

. Care should also be exercised

LBS

REAR

GAWR

7,000

LBS

*FRONT

FRONT &

*Curb weight is the weight of the vehicle without driver, passenger, or cargo,

but does include fuel and coolant

CURB

CARGO

PASS.LOAD

TOTAL

MAXIMUM

3,725

475

LBS

4,200

LBS

TOTAL

Vehicle

LBS

WEIGHT

GROUND

Loading (23' Model)

10,500

LBS

FRONT

4,200

GVWR

LBS

GVWR RATING 11,700 LBS

REAR GAWR

7,500 LBS

*FRONT

CURB

3,685 LBS

FRONT CARGO & PASS

TOTAL

. LOAD

515 LBS

4,200

LBS

MAXIMUM TOTAL WEIGHT AT GROUND

*Curb weight is the weight of the vehicle without driver,

but does include fuel and coolant

Vehicle

to see that the load is distributed on both sides

of the centerline of the vehicle as equally as

possible

(

26' Model)

the GVWR and the front and rear GAWR's for the vehicle to which they are attached

Gross Vehicle Weight (GVW) is the weight of the vehicle itself, all items added to the vehicle

EFFECT

Your New Vehicle Warranty does not apply to any part of your vehicle "which has been subject to misuse

loading has been subject to misuse within the meaning of this provision of the warranty

ALLOWABLE WEIGHT

WARRANTY

after it has left the factory, the driver and all occupants, and everything that is loaded into

(or onto) the vehicle

." Any part which fails because of over-

ceed of the loaded vehicle must not exceed the front and rear GAWR's

LATERAL

VARIATION

The independent suspension on this vehicle

could be adversely affected by an unbalanced load on either side of vehicle

front lateral weight variation is 250 pounds

. The allowable

The allowable rear lateral weight variation is

600 pounds

11,700 LBS

passenger, or cargo,

The GVW must not ex-

the GVWR

and the front and rear weights

GENERAL MOTORS CORPORATION

WARRANTY MAY BE VOIDED IF WEIGHT EXCEEDS ANY OF RATINGS SHOWN VEHICLE WEIGHT INCLUDES WEIGHT OF BASE VEHICLE, ALL ADDED EQUIPMENT, DRIVER AND PASSENGERS, AND ALL PROPERTY LOADED INTO OR ONTO VEHICLE

RATINGS IN POUNDS-AS MANUFACTURED

GROSS VEHICLE WEIGHT FOR THIS VEHICLE

MAXIMUM FRONT END WEIGHT AT GROUND

MAXIMUM REAR END

VEHICLE IDENTIFICATION NO

WEIGHT AT GROUND

. GROSS

VIN (Vehicle Identification Number) Plate

The vehicle identification number plate shows

Vehicle

Identification

Plate

CAUTION

When

luggage

mended that the articles be secured in

place such items from becoming dangerous projectiles in the event of an accident

TIRES

It is important that the tires on your vehicle be of the proper size, and be properly inflated

using your

. This precaution will help prevent

other

vehicletotransport

cargo,

it is

recom-

For continuing satisfaction keep your vehicle all GM

. General Motors Parts are identified by one

of these trademarks

It is important to avoid over-inflation as well as under-inflation MAINTENANCE tion pressures

REAR BUMPER LOADING

attachments, when attached to the rear bumper

Such items could nullify the energy absorbing capabilities of the rear bumper MotorHome service outlet can advise you as to

suitable means of attachment

. See the

section for proper tire infla-

Care must be taken with racks or temporary

SERVICE AND

. Your GMC

BEFORE

STARTING

DRIVER CHECKLIST

Before Entering Vehicle

1.See

. Check that area to rear is clear if about to

Before Driving Off

. Lock all doors

. Position seat

. Adjust inside and outside mirrors

3 4

. Fasten seat belts

. Check that warning bulbs light when key is

. Release parking brake (and see that brake

. Be sure you understand your vehicle and

that

windows,

clean

Visually note inflation condition of tires

back up

turned to start position

warning light turns off)

how to operate it safely

REMINDER when driving for greater security in the event of an accident, to help keep children from opening door, and for greater security against entry by unwelcome

persons while momentarily stopped

: Always lock entrance door

mirrors

and

lights

are

YOUR VEHICLE

KEYS

Two sets of keys are furnished with your vehicle

. Each key hasadifferent cross section so

that it can be inserted only in certain locks Key

with

Square

Key

with

Oval

and other locking compartments

The code number of each key is stamped on the "knock out" plug in the key head dealer removed these plugs and placed them with the spare set of keys in the special key

envelope that was given to you at the time of delivery

•

cates can be made by your dealer or a locksmith using the key code information

key from the vehicle whenever it is necessary to leave the ignition key with an attendant

. For your protection

Record the numbers on the key envelope and discard the key plugs

Keep the key envelope in a safe place such as your wallet, NOT IN THE VEHICLE

In the event the original keys are lost, dupli-

Be sure to lock the glove box and remove the

Head-For

ignition switch only

door lock, glove box

. Your

CAUTION

operated driver's seat while the vehicle is moving-the seat could move unex

pectedly, causing loss of control of the

vehicle

: Do not move the manually

INSIDE REARVIEW MIRROR

Switch inside mirror to night position to reduce glare from following headlights

To raise or lower mirror to achieve desired field of view, grasp mirror and exert sufficient pressure by pushing or pulling up, down, or sideways

Inside Rearview Mirror

Seat

Track Mechanism

The seats can be swiveled to provide easy

entrance and exit locking mechanism by moving seat swivel lever,

then turn seat

Check that in position before driving off

swiveled during an accident the occu-

pant may be more likelyinjured NOT adjust the driver's seat swivel or

fore and aft mechanism while the ve-

hicle is moving

unexpectedly causing loss of control of the vehicle

. To turn swivel seat, release

CAUTION

all swiveling

. The seat could move

seats are locked

. If any seat

. D

ENTRANCE DOOR

SEATS

The driver and passenger seats in the driver compartment may be adjusted to suit an individual's preference (except dual passenger seat)

To move seat forward or backward, simply re-

lease the seat locking lever located on the left side of the seat

pressure in the direction desired

to lock the seat in the desired position

. Once released, exert slight body

. Release lever

DOOR LATCH

by inserting the key into the door key lock and

turning

tion

lock button DOWN from the inside, pull the lock button UP and pull on inside door handle

Door must be locked from outside the vehicle

. To unlock, turn in the clockwise direc-

. Reverse the direction to lock

To lock door from inside vehicle, push the

. To unlock and open door

Seat

Swivel

Mechanism

Entrance

LAP

BELTS

Your vehicle is equipped with lap belts in the driver and front passenger seating position(s) It is recommended that while the vehicle is in

motion, all occupants remain seated and keep

lap belts buckled snugly at all times

The front outboard seating positions-have retractors which are designed to automatically

take up excess webbing

•

Adjust seat to desired position and sit erect and well back in the seat

•

In a single motion, pull webbing across lap

far enough to permit inserting metal latch plate end of lap belt into the buckle, until a

snap is heard

enough to reach the buckle, let the belt rewind into the retractor to release lock mechanism, so belt can be pulled out to the proper

length

•

Position belt across lap as LOW ON HIPS as possible

under the belt during an accident, adjust to a SNUG FIT by pulling belt firmly across lap in direction of retractor so it can take up

slack

. If webbing is not pulled out far

. To reduce the risk of sliding

Door

Latch

should become jammed, you may be able to

release it by working the belt in or out until the

belt rewinds far enough to unlock

remains jammed or other parts of the restraint system do not operate properly take the vehicle to your dealer for service

Inboard seating position, front dual passenger

seat (if so equipped) secured as above, and adjusted to a SNUG FIT

by pulling on the end of the belt extended from the adjustable latch plate

. If lap belt

-should be positioned and

NOTE

: Take care not to let the lap belt twist

while it is being rewound into the retractor

bulk of the twisted belt may cause the retractor

to jam so it will not rewind further, while at the same time the retractor's locking mechanism may prevent the belt from being withdrawn

. The

. If a belt

Lap Belt (Front Seating Positions)

• To lengthen the lap belts at these seating positions, place adjustable latch plate at right

angle to the belt webbing and pull on latch

plate

; belt should then slide easily through

the adjustment feature

•

To unfasten seat belts, depress push button

in center of buckle

CAUTION

A snug fit and a low lap belt position are essential to lessen the chance of in-

jury in the event of an accident, because this spreads the force exerted by the lap

belt in a collision over the strong hip

bone structure rather than across the soft abdominal area

of injury in the event of an accident

never use the same belt for more than

one person at a time

belts in a twisted condition belts or hardware to become pinched between the seat structural

member or in the door

LAP

BELT

•

Periodically inspect belts, buckles, retractors, and anchors for damage that could lessen the effectiveness of the restraint system

•

Keep sharp edges and pointed objects away from belts

•

Replace belts if cut, weakened, frayed, or subjected to collision loads

•

Check that the anchor mounting bolts are tight

•

Have questionable parts replaced

•

Keep belts clean and dry

•

Clean only with mild soap solution and lukewarm water

•

Do not bleach or dye belts since this may

severely weaken them

. To lessen the chance

; avoid wearing

; do not allow

(metallic)

INSPECTION

CHILD RESTRAINT

Children in vehicles should be restrained to lessen the risk of injury in accidents, or sudden stops

. In using any infant or child restraint sys-

tem, read and follow all installation and usage instructions

All unused lap belts near the child should be stowed properly to help prevent them from striking the child in the event of an accident

Lap belts without storage provisions should have

buckles latched and belts adjusted to remove

slack

If a child is traveling in a vehicle not equip-

ped with an appropriate infant or child restraint

system, the following precautions should be

taken

. Infants unable to sit up by themselves should

be restrained by placing them in a covered

padded bassinet placed crossways in the vehicle

(widthwise)

restrained with the regular vehicle lap belts

. Children able to sit up by themselves should be placed on a seat and lap belted . Never allow a child to stand or kneel on any seat or elsewhere in the vehicle, once it is underway

Towing a trailer will affect handling, durabil-

ity and economy

tion depends upon proper use of correct equip-

ment and avoiding overloads and other abusive operation

The maximum loaded trailer weight which

you can pull with your vehicle depends on what special equipment has been installed does not recommend towing any trailer OVER

1,000 POUNDS GROSS TRAILER WEIGHT unless the vehicle HAS THE REQUIRED EQUIPMENT capabilities, special equipment required, and optional equipment offered can be obtained by writing to GMC Truck & Coach Division, Gen-

eral Motors Corporation, Technical Service Department, Pontiac, Michigan 48053 (or in Canada, by writing to General Motors of Canada Limited, Owner Relations, Department, Oshawa, Ontario L1J 5Z6)

To assist in attaining good handling of the

Vehicle Trailer Combination, it is important that the trailer tongue load be maintained at

approximately 10 % of the loaded trailer weight Tongue loads can be adjusted by proper distribution of the load in the trailer, and can be checked by weighing separately the loaded trailer and then the tongue

When towing trailers, tires should be inflated to the highest inflation pressures shown on tire placard located on glove box door able passenger and cargo load (GVW) of this vehicle is reduced by an amount equal to the

trailer tongue load on the trailer hitch

. The bassinet should be securely

TRAILER

. Maximum safety and satisfac-

. Information on trailer hauling

HAULING

. GMC

. The allow-

MAINTENANCE

More quired when being used to pull a trailer to "SERVICE and MAINTENANCE" section in this manual

BREAK-IN SCHEDULE

In addition to the "New Vehicle Operating Speeds" given later in this section, it is recom-

mended that your new vehicle be operated for 500 miles before trailer towing to tow during this period, avoid speeds over 50 MPH, and full throttle starts

frequent

. Trailer brakes are required on trailers

over 1,000 lbs

. DO NOT tap into vehicle's hydraulic

brake system if operation of the trailer brake system requires more than 0 ment from the vehicle's master cyl-

. The vehicle's master cylinder

inder fluid capacity will not be sufficient to

operate both vehicle and trailer

brakes under all conditions of use if more than 0

placement is required

. Whenever a trailer hitch is removed,

be certain to have any mounting holes in underbody properly sealed to prevent possible entry of exhaust fumes, dirt or water EXHAUST GAS CAUTION"

lowing section

.02 cu

vehicle

CAUTIONS

.-in

.02 cu

OPERATION

FOREIGN

Your vehicle's engine is designed to operate

on unleaded fuel of approximately 91 research octane number

maintenance

. If it is necessary

. loaded weight

. of fluid displace-

.-in

. of fluid dis-

. (See

"ENGINE

in the fol-

COUNTRIES

. Refer

re-

If you plan to operate your vehicle outside the continental limits of the United States or Canada, there is a possibility that the best fuels available are so low in anti-knock quality that

excessive knocking and serious engine damage may result from their use tion on the quality of fuels available in the countries in which you plan to travel write to

GMC Truck & Coach Division, General Motors

Corporation, Pontiac, Michigan 48053 (or in

Canada write to General Motors of Canada

Limited, Owner Relations Department, Oshawa,

Ontario), giving

•

The vehicle identification number (from

plate attached to right side of dash panel or from the registration slip or title)

•

The country or countries in which you plan

to travel

It is recommended that you do not operate your vehicle in any country not having fuels

meeting the requirements of your vehicle's engine as these MAY CAUSE ENGINE DAMAGE for which GMC Truck & Coach is not responsible under the terms of the New Vehicle Warranty or Emission Control Systems War-

ranty

NEW

Driving speeds for your new vehicle should be limited to a maximum of 50 MPH for the first 100 miles, and 65 MPH for the next 400

miles with no heavy throttle accelerations your initial mileage is of the around-town variety, which is considered "severe service" especially in cold weather, be sure to include some

25 to 50 mile highway trips during the breakin period and vary the vehicle's speed

. To obtain informa-

VEHICLE OPERATING SPEEDS

. If

STARTING AND OPERATING VEHICLE

ENGINE EXHAUST GAS CAUTION

(CARBON MONOXIDE)

Avoid inhaling

itself is colorless and odorless unconsciousness and is potentially lethal

If, at any time, you suspect that exhaust fumes are entering the vehicle from any

source have the cause determined and corrected as soon as possible before the cause is corrected, drive only with ALL windows FULLY open and heating or

cooling system adjusted for maximum ventilation (see below)

The best protection against carbon monoxide entry into the vehicle body is a properly maintained engine exhaust system, body and body ventilation system ommended that the exhaust system and body be inspected by a competent mechanic

•

Each time the vehicle is raised for lubrication or oil change

•

Whenever a change is noticed in the sound, alignment, or appearance of the exhaust

system

•

Whenever the exhaust system, underbody or rear of the vehicle is damaged

See your Maintenance Schedule folder for inspection procedure

To allow proper operation of the vehicle's ventilation system, keep front inlet

grille clear of snow, leaves, or other obstructions at all times

OCCUPYING A PARKED VEHICLE WITH ENGINE RUNNING FOR AN

PERIOD OF TIME

Do not run engine in confined areas such as garages any more than needed to move

vehicle in or out of area engine running for any more than a short period of time, adjust heating or cooling system to force outside air into the vehicle as follows

or high speed and upper control lever to any position except "OFF

lever should be adjusted to any position except extreme left "RECIRC

high speed, upper control lever to any position except "OFF," and lower control lever to any position except extreme left "RECIRC

The two rear windows (if so equipped) should be closed while driving to avoid

drawing dangerous exhaust gases into the vehicle through those openings tion, it is recommended that roof vent(s) be closed while driving a rear window or roof vent must remain open for a period while driving, or electrical wiring or other cable connections to a trailer must pass through the seal between them and the body, the following precautions should be observed

•

Close all windows

•

in Step 1 or 2 above but with fan set at high speed

•

It is important that the inside engine cover be properly seated to prevent possible

leakage of exhaust fumes into the vehicle through this opening

. On vehicles not equipped with automotive air conditioning, set fan to medium

. On vehicles equipped with automotive Air Conditioning, set fan to medium or

Adjust heating or cooling system to force outside air into the vehicle as described

Air vents in the instrument panel should be fully open

exhaust gases because they contain carbon monoxide, which by

. Carbon monoxide is a dangerous gas that can cause

. If you must drive

. It is rec-

EXTENDED

IS NOT RECOMMENDED

. When vehicle is stopped in an UNCONFINED area with the

." Lower control

. In addi-

. If, for some reason,

NOTE

: Particular care should be taken to prevent the possibility of carbon monoxide

exposure when the vehicle is modified for recreational or other usage

some recreational vehicle appliances (such as lights, refrigerators, stoves, heaters) may

generate carbon monoxide and should be used only if there is adequate ventilation

. Additionally,

~F~

STEERING COLUMN CONTROLS

ANTI-THEFT

COLUMN

The anti-theft ignition switch, located on the

right side of the steering column, has five positions

•

ACCESSORY-Permits operation of electri-

STEERING

LOCK

2 . Place the transmission selector in "P" or "N" ("P" is designed to prevent starter operation while

cal accessories when the engine is not running

. To engage, push key in and turn toward

you (counterclockwise)

•

LOCK-Normal parking position, locks igni-

tion and provides added theft protection by preventing normal operation of steering

wheel and shift controls

. Key cannot be

turned to "LOCK" position and removed

until transmission is placed in "PARK

•

OFF-Permits turning engine off without locking steering wheel and shift controls

•

RUN-Normal operating position

•

START-Permits engagement of starter

STARTING

. Apply the parking brake

is preferred)

ENGINE

. A starter safety switch

NOTE:The anti-theft steering column lock is not a substitute for the parking brake

. Always set the parking brake when leaving the driver's seat unattended

If difficulty is experienced in turning the igni-

tion key and lock knob to unlock the ignition,

attempt to turn the steering wheel as hard as

possible in the direction the wheels are turned

. At the same time turn the ignition-lock knob in a clockwise direction with as much effort as you can apply with your own hand

. Do not attempt to use a tool of any kind to apply additional force on the lock knob, as this could break the

knob

PARKING

When leaving the driver's seat unattended

•

SET PARKING BRAKE

on page 16)

•

Place transmission selector lever in "PARK

•

Turn key to LOCK position

•

Remove key from steering column lock (the

buzzer will remind you)

•

Lock entrance door if leaving vehicle

FIRST

(See note

A -

CRUISE CONTROL ENGAGE BUTTON

B -

TURN SIGNAL LEVER

C -

TILT-AWAY STEERING WHEEL LEVER

D - IGNITION SWITCH

E -

HORN BUTTON

F -

HAZARD WARNING FLASHER BUTTON

G -

TRANSMISSION SELECTOR LEVER

Steering Column Controls

Anti-Theft Steering Column

Lock

EXTREMELY OR

AFTER VEHICLE

IDLE

FOR

COLD

SEVERAL

WEATHER

HAS

DAYS

(BELOW00F.)

BEEN

STANDING

Fully depress and release accelerator

two or three times before cranking With foot off the accelerator

engine by turning the key to the

release key when engine starts

the engine

pedal, crank the

start position

pedal

ENGINE

•

First, fully depress and release tor pedal several times, from accelerator pedal and crank

•

engine still does not start,

If the accelerator pedal and hold

while cranking the engine

Transmission Shift Indicator

and Speedometer

•

If the engine has been flooded with it may start to run but not power to keep running

the transmission selector is in any drive

position

(If it is necessary to re-start the engine with the

"N"

vehicle moving, place the selector lever

. Depress accelerator

starter as outlined in the following, conditions

pedal and activate

for different

cranking with the accelerator pedal

pressed until the engine cleans itself of excess

gasoline and runs smoothly

•

If engine doesn't crank

discharged main battery

tery), place the battery switch in

BOOST" position

"BAT NORMAL" position

starts

COLD

release by turning the ignition key position-release when engine starts starts but fails to run, When engine is running smoothly

seconds) the idle speed slightly depressing the

then slowly releasing

ENGINE

Fully depress accelerator

pedal and slowly

. With foot off the pedal, crank

to the "START"

repeat this procedure

(approx

may be reduced by

accelerator pedal and

the engine

. If engine

NOTE more than 30 seconds at a time to prevent ing overheating

. 30

the right side of the steering

: Do not continue cranking the

AUTOMATIC

The transmission selector lever

shift indicator is located in the bottom the speedometer cluster on the dash

CAUTION

Extended

running

the engine (5

minutes or more) without depressing the accelerator pedal, could cause

to the engine or exhaust system due overheating

damage

•

"PARK"-Transmission or while starting the engine

lever towards you to select

position "PARK" position unless the vehicle

pletely stopped other position in which your vehicle started

WARM

hold while cranking the engine

ENGINE

Depress accelerator pedal about

halfway and

•

REVERSE "R" -For backing Bring the vehicle to a complete

moving the selector lever into Reverse

FAILS

START

the accelera-

then remove foot

engine

fully depress

to the floor

gasoline,

have enough

. In this case,

continue fully de-

properly due to a

(automotive bat-

the "BAT

. Return the switch to the

when engine

engine for

start-

TRANSMISSION

is located on

column and the

section of

lock when parking

. Pull the

selector

or release this

. Never move the selector lever to

is com-

. "NEUTRAL"

is the only

may be

the vehicle

stop before

• NEUTRAL "N"-The out-of-gear position

It is provided for starting a stalled engine while the vehicle is in motion or running the engine while standing with brake DONOT COAST IN NEUTRAL

a pplied

•

DRIVE RANGE city and highway driving

The driving range for

"D"-

. This position per-

mits the transmission to operate through its complete range of gear ratios and to select

automatically the proper ratio for road and

load conditions

•

SUPER RANGE "S"-Used when super per-

formance is needed for increased acceleration

in traffic, hill climbing, or "Engine Braking"

down-hill from "D" to "S" and vice versa, under most operating conditions be used at speeds above 75 MPH

•

LOW "L"-Available for heavy pulling

through mud or sand and for engine braking

when descending steep hills

may be moved to "L" at any speed but the

. The selector lever may be moved

. "SUPER" should not

downshift in "DRIVE" range at speeds under

35 MPH by depressing the accelerator pedal part way down

. The selector lever

TURN

LANE CHANGE FEATURE

transmission will only shift automatically

into Low range when the vehicle speed is

under approximately 40 MPH

. The transmission will not upshift from Low range as long as the selector lever is in the "L" position

Whenever a right or left turn is intended,

when changing lanes, or when pulling away

from the curb, use the turn signals

•

FULL TURN-For normal turns, move the turn signal lever to position "A" for right

CAUTION

Before grade, down reduce gear

trol vehicle speed frequent application of which could cause overheating and thus

reduce brake effectiveness when shifting into lower range or lower

gear on slippery surfaces with vehicle

moving-abrupt engine braking action could cause the front wheels to skid,

possibly leading to loss of vehicle control

descending

speed

. Use the lower gear ranges to con-

steep

mountain

and

shift

. Avoid prolonged or

hillside,

intoalower

the

brakes

. Use caution

long

turn and "B" for left turn

in position without manual effort until the turn is completed, then cancel automatically

•

LANE CHANGE position "C" for change to right lane or to

"D" for change to left lane

position until lane maneuver is completed,

then release

position

HAZARD WARNING FLASHER

For operation of hazard warning flasher, see

"In Case of Emergency" later in this manual

•

FORCED DOWNSHIFT -When additional

acceleration is desired to pass moving vehicles or to climb steep grades at speeds between approximately 35 and 65 MPH, the

transmission can be downshifted by depressing the accelerator pedal completely to the

floor

. It is also possible to obtain a forced

The horn is actuated by depressing the rec-

tangular shaped GMC button located in the center of the steering wheel

Turn Signal Lever

SIGNAL AND

. Lever will remain

Move lever to the detent

. Hold lever in

. Lever will return to "OFF"

HORN CONTROL

The tilt mechanism is operated by lifting up

on the small control lever, on the left side of the steering column just below the directional signal lever, then moving the steering wheel to the

selected position and releasing the lever

speed control system which is designed to allow

the vehicle to hold a selected speed of approxi-

mately 30 MPH or higher-depending on engine limitations-thus increasing comfort and economy on turnpikes, and other non-congested highways

•

Tilt Steering Wheel

•

Cruise Control Lever

POWER

If the steering system power assist fails due

to some malfunction, or because the engine has

stalled, the vehicle can still be steered

much greater effort is required, particularly in

sharp turns

The tilt steering wheel can be tilted up above normal position to provide additional room for entrance and exit as well as selected driving positions above or below normal height

TILT

STEERING

WHEEL

•

. However,

CRUISE

The optional Cruise Control is an automatic

TO OPERATE

ment button is located in the end of the turn signal lever desired speed and momentarily push in the engagement button, take your foot off the accelerator and this speed will be maintained

TO RESET AT A FASTER SPEED celerate the vehicle to the desired higher speed, push in the engagement button fully and release slowly

TO RESET AT A SLOWER SPEEDDepress the engagement button fully and

HOLD vehicle reaches desired speed, release the engagement button slowly

FOR PASSING-You can increase your speed by depressing the accelerator pedal

When you remove your foot from the pedal, the vehicle will slow down to the cruising speed set prior to the acceleration

TO DISENGAGE-Lightly apply the brake

pedal to disengage system

. Accelerate the vehicle to the

. Allow vehicle to decelerate

CONTROL

- The Cruise Control engage-

Ac-

. When

CAUTION

DO NOT use the Cruise Control when conditions are not suitable for maintain-

ing a constant speed, such as in heavy or varying traffic, or on winding or slippery roads

. With the Cruise Control engaged, removing foot from the accelerator pedal does not permit engine

speed to return to idle

Vehicle Floor Controls

FLOOR

POWER

This

vehicleisequipped

draulic Split also equipped with disc type brakes on the front

wheels and drum type brakes on the tandem

rear wheels

NOTE:Operation of the brake system warning light is covered (on page 19) (in the section on

"Instrument Panel and Controls

BRAKE

System With Power Assist

SYSTEM

withaDual Hy-

.")

CONTROLS

. It is

CAUTION

Driving through deep water may wet

the brakes and adversely affect brake

performance so that the vehicle will not

slow down at the usual rate, and may

pull to the right or left

brakes lightly will indicate whether they have been so affected quickly, lightly apply the brakes while maintaining a safe forward speed with an assured clear distance ahead until

brake performance returns to normal

. Applying the

. To dry them

•

If excess brake pedal travel develops, drive alternately backward and forward several times and apply brakes firmly in each direction

•

See your dealer if normal pedal travel is not restored, or if there is a rapid increase in pedal travel, which could be a sign of other

brake trouble

NOTE

on the brake pedal when not intending to brake

can cause abnormally high brake temperatures,

excessive lining wear and possible damage to

brakes

REMINDER:Front disc brakes have a built-in

wear indicator that is designed to make a high

frequency, squealing, or cricket-like warning sound when the linings are worn to where re-

placement is required intermittently

Parking Brake Control

•

On your vehicle, if power assist to the brakes is interrupted due to a stalled engine or some malfunction, two or more brake applications

can normally be made using reserve power

•

If the brake pedal is held down, the system

is designed to bring the vehicle to a full stop on reserve power is partially depleted each time the brake pedal is applied and released brakes when brake power assist has been

interrupted, except when necessary in order to maintain steering control on slippery surfaces

•

When reserve power is exhausted, the vehicle can still be stopped by applying greater force

to the pedal

SELF-ADJUSTING BRAKES

Brakes on this vehicle (except for the Parking Brake) are self-adjusting, designed to eliminate periodic adjustments

Drum brake adjustments are made automatically as the brakes are applied while vehicle is moving backwards

. However, the reserve power

. Do not pump

rolling, but will disappear when the brake pedal is applied firmly checks listed in the maintenance schedule folder

PARKING BRAKE

•

To set parking brake, pull up the handle located on the floor against the left wall, be-

low the instrument panel

•

For maximum holding power, depress regular brake pedal with the right foot at the same time

•

To release parking brake push the handle down

•

As a reminder, the "PARK BRAKE" reminder light is designed to glow whenever

the parking brake control is not fully released, and the ignition is on

•

Never drive vehicle with parking brake set

as this may overheat or otherwise damage rear brakes

The amount of force required to apply park-

ing brake can be adjusted by turning a tension adjustment knob located at the upper end of

the lever application the lever the greater the degree of brake application

"Riding The Brake by resting your foot

. The sound will occur

or continuously when wheels are

. See also the various brake

. This also adjusts the degree of brake

. The greater the force required at

Disc brake adjustment is made automatically

with each brake application

NOTE:The parking brake should be set first

whenever the driver's seat is left unattended

If the vehicle is parked on a grade and the

transmission is placed in "PARK" before the parking brake is set, the weight of the vehicle may exert so much force on the parking pawl in the transmission that the transmission selector

lever cannot later be pulled out of "PARK

prevent this, the parking brake should be plied BEFORE moving the transmission selector lever to "PARK the vehicle, the shift indicator should be moved out of the "PARK" position BEFORE releasing the parking brake

set the parking brake first, and release the transmission from "PARK" first at all times, even on the level called, does occur, it may be necessary to have another vehicle nudge this vehicle up hill, to take some of the pressure off the transmission

while the driver pulls on the transmission selec-

tor lever

. If "torque lock", as this condition is

." When preparing to move

. It is good driving practice to

." To

ap-

HEADLIGHT DIMMER SWITCH

To obtain high or low beam headlights, push

the foot dimmer switch locatedonthe floor to the left of the brake pedal

is depressed, the light beam changes beam indicator, on the face of the speedometer, is designed to light up when the headlights are

high beam

The headlight circuits are protected by a

circuit breaker in the light switch on the breaker will cause the lights to "flicker" on

and off, or in some cases to remain off

this condition develops, have your headlight

electrical circuit checked immediately

INSTRUMENT PANEL AND CONTROLS

. Each time the switch

. A headlamp

HEADLIGHT "FLICKER"

. An overload

. If

SPEEDOMETER AND ODOMETER

The speedometer indicates the forward speed of the vehicle in miles-per-hour registers the accumulated mileage the vehicle has been driven ter cluster are the turn signal indicators which

show direction and proper operation of the turn signals, the high beam indicator light, and the shift indicator

. Also, located in the speedome-

. The odometer

FUEL GAUGE

This gauge shows the approximate fuel level

in the main tank when fuel selector switch is in

the "FUEL MAIN" position, and the fuel level

in the auxiliary tank when fuel selector switch is in the "FUEL AUX" position will indicate the correct positions only when the ignition is in the "ON" position

Since both fuel tanks are interconnected, the

indicated level is designed to read the same

(with the switch in either position) until approximately 60% of the total fuel capacity has been used this section

. See "Fuel Selector Switch" later in

. The pointer

This gauge registers the temperature of the

engine coolant The center area of the water

temperature gauge marks the normal operating range

center area marks into the "H" side or hot area of the gauge, stop the engine as soon as possible, and remain stopped heating is determined

This gauge registers engine oil pressure

consistency of the oil in a cool engine will cause a high reading when the engine is first started As the engine warms, the pressure will recede to normal operating temperature, minimum pressure at idle should be slightly above the "L" graduation

(8 PSI) pressure should be between the second and middle graduations (35 PSI) sure drop below these minimums, stop the engine immediately and check the cause of the low

oil pressure . This could be the result of a dangerously low oil level in the crankcase . Driving the vehicle with low oil pressure can cause extensive engine damage

TEMPERATURE GAUGE

. However, if the needle moves beyond the

until

the cause of the over-

OIL PRESSURE GAUGE

. The

. With the engine warmed up to normal

. At normal operating speeds, minimum

. Should the pres-

. WINDSHIELD WIPER CONTROL

. SPEEDOMETER . HIGH BEAM INDICATOR

3 4

. ODOMETER

. TEMPERATURE GAUGE

. FUEL GAUGE

Speedometer and

Gauge

. OIL PRESSURE GAUGE

. WARNING LIGHTS

. HEATER/A.C. CONTROLS

. LIGHT SWITCH

. WINDSHIELD WASHER

. SHIFT INDICATOR

Instrument

Clusters

. GENERATOR LIGHT 14 BRAKE SYSTEM WARNING LIGHT 15

. FUEL SELECTOR SWITCH

. BATTERY BOOST SWITCH . RADIO & CONTROLS

. CIGAR LIGHTER

Panel

CHARGING SYSTEM WARNING LIGHT

Located to the right of the temperature gauge

is the charging system warning light "GEN" will appear with the ignition key in the "ON" position and the engine not running light lets you know the warning signal is oper-

ational your MotorHome dealer

. Should the light fail to come on, see

. When the engine is

started, the warning light should go out and remain out

. If the light remains on when engine is running, have your dealer locate and correct the trouble as soon as possible

. A red light

. This

BRAKE

The service brake system is designed so that half of the brake system will provide some braking action in the event of a hydraulic leak in the other half of the system

ing light, located to the left of the oil pressure gauge, glows continuously when the engine is running and after the brakes have been firmly applied, it may indicate that there is a malfunction in one part of the brake system

•

As a check on bulb condition the light should glow during engine starting

•

Have system repaired if light does not come

on during check

•

This warning light is not a substitute for the visual check of brake fluid level required as part of normal maintenance

WHAT

•

The service brake system is partially inoperative

. Pull off the road and stop, carefully-re-

membering that

•

Stopping distances may be greater

•

Greater pedal effort may be required

•

Pedal travel may be greater

. Try out brake operation by starting and

stopping on shoulder of road

•

If you judge such operation to be safe, proceed cautiously at a safe speed to nearest service outlet for repair, or

•

Have vehicle towed to dealer for repair

Continued operation of the vehicle in this con-

dition is dangerous

TELL-TALE WARNING LIGHT CLUSTER

A cluster of indicator lights is located just to the left of the heater controls signed to inform the driver of the status of

certain systems or conditions of which he should be aware

SYSTEM WARNING LIGHT

LIGHT

. Among these are

. If the red warn-

GLOWS

RED

then

. These are de-

•

"CRUISE" (Optional Equipment) indicator is designed to glow GREEN whenever the Cruise Control System is engaged and working

•

"DOOR"- The door light is designed to warn the driver that the entrance door is not prop-

erly closed

•

LOW AIR-The low air light is designed to warn the driver that air pressure in the rear

suspension system is abnormally low "Emergency Operation," page 26, later in this

section

•

"PARK BRAKE" -As a reminder, the

"PARK BRAKE" brake reminder light is de-

signed to glow whenever the parking brake

control is not fully released and the ignition

is on

•

"LOW FUEL" (Optional Light)

fuel warning light in your vehicle is designed

to come on when the main tank has less than

five gallons of fuel left and the fuel selector

switch is in the "FUEL MAIN" position

at any point after this, the fuel selector

switch is changed to "FUEL AUX" the

"LOW FUEL" warning light will then go

out and come on again when the fuel in the

auxiliary tank goes below five gallons

point both fuel tanks of your vehicle are

nearly depleted

•

"SET POWER LEVEL TO TRAVEL" (Op-

tional Light) -This light is designed to inform

the driver that the optional power level con-

trols should be set to the "TRAVEL" position

before driving the vehicle (also a buzzer will

sound for approximately 10 seconds)

will allow your vehicle's air suspension sys-

tem to automatically maintain the proper

suspension pressure while the vehicle is being

driven

this section

Warning Light

. (See "Power Level System" later in

Cluster

. (See

The low

. At this

. This

This

. If,

Fuel Tank and Battery Switches

WINDSHIELD

The windshield washers are controlled by the

Windshield Wiper, Washer,

and Headlight Controls

washer switch located under the windshield wiper lever

. To operate the washers, turn the wipers to an ON position, then push down on the switch until the desired amount of washer

HEADLIGHT

SWITCH

The headlight switch serves four functions

. Pulling the switch half-way out provides parking lights, instrument panel lights, tail lights, side marker lights, and clearance and identifi-

cation lights

. Pulling the switch all the way out provides all driving lights, those mentioned above

. To dim instrument panel lights, turn switch knob clockwise

. To operate the dome lights, turn switch knob fully counterclockwise

this includes headlights, plus

fluid has been directed to the windshield

•

Check washer fluid level regularly

frequently when the weather is bad

•

Use a fluid such as GM OPTIKLEEN to

prevent freezing damage, and to provide bet-

ter cleaning

•

Do not use radiator anti-freeze in windshield washer

•

In cold weather, warm the windshield with

; it could cause paint damage

defrosters before using washer prevent icing that may seriously obscure

vision

FUEL

SELECTOR

The fuel selector switch, located below the warning light cluster, has two positions-"FUEL MAIN" and "FUEL AUX

WINDSHIELD

WIPER

LEVER

the driver to change the fuel pick-up and fuel gauge sending unit from the main tank, as it

The windshield wipers are variable speed,

and hydraulically powered

. The lever control, on the left side of the instrument panel varies the speed of the wiper blades from stop

("DOWN" position) to fast (extreme "UP"

position)

goes empty, to the auxiliary tank which will normally contain 7 to 9 gallons of fuel recommended that any time the fuel system is filled, this switch be put in the "FUEL MAIN" position and left there until auxiliary fuel is

needed

WASHERS

do it

to help

SWITCH

." This switch allows

. It is

+ 49 hidden pages

Gmc ZEO6083 1974 User Manual

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