GMC Motor Home User manual

© General Motors Corporation 1973
GMC MOTOR HOME
OPERATING MANUAL
IMPORTANT
This manual should be considered a permanent
part of the
vehicle
and
must remain with the
vehicle
at
time of re-sale
.
All
information, illustrations and specifications
contained in this manual are based on the latest
product information available at the time of pub-
lication . The right is reserved to make changes at
any time without notice .
For vehicles sold in Canada, substitute the
name General Motors of Canada whenever the
name GMC Truck & Coach Division appears in
this manual .
Service Publications
GMC TRUCK & COACH DIVISION
GENERAL
MOTORS
CORPORATION
Pontiac, Michigan 48053

TABLE OF
CONTENTS
SUBJECT
PAGE NO .
SUBJECT PAGE NO .
Important Information
on
Fuel Gauge . . . . . ............... . . 20
Vehicle Loading ... . . ...... . . ........ ... 1
Temperature Gauge . . . ............ 21
Before Driving Your
Motor Home
..... . . . . .
5Oil
Pressure Gauge . . ............. 21
Driver Checklist ....................
5
Charging System Warning Light . . . . 21
Inside Rearview
Mirror . . ........... 5
Brake
System
Warning Light .. .... 21
Seats ........ . .
. . . . . . . . ............ 6Tell-Tale
Warning Light Cluster .... 22
Keys . . . ...........
. . . . . . . . . .......
7
HeadlightSwitch
..... .
. .. .
. .
. ... .
22
Entrance Door ........ . . . . . . . . . .... 7
Windshield Wiper Lever . . . . . . . . . . .
22
Lap Belts ..................
. . . . . . . .
8
Windshield Washers . . . . ...... . ...
23
Child Restraint . .
. ......... . . . . ... . 9
Fuel Selector Switch ............. .
23
Vehicles Not
EquippedWith
Special
Child Restraints .......... . 9
Battery Boost Switch .............
23
Operation
In Foreign Countries . . .... 9
Cigar-Cigarette Lighter . .. ........
23
Trailer Hauling ... ..... ..... ..
. . . . . 10
Heating System (Without
Trip Tips
. . . . . ... ..... . .... . ..
. . . .
10
Automotive Air Conditioner) .... .
23
Driving
Tips . . . . ............... .. . .
11
Automotive Air Conditioner .. .....
24
New Vehicle
Operating Speeds ........
11 Radios and Tape Deck .. . ........
25
Starting and
Operating Vehicle ....... . . . .
13
Mobile Radio Transmitters ........
27
Engine Exhaust Gas Caution . . .... . .
13
Power Level System . . . . . . . . . . ....
2 7
Steering
Column Controls . . . . . . . . . . .
14
Operation of Living Area Facilities ........ 29
Anti-Theft Steering Column
Lock . . 14
Living Area Facilities Caution . . . . . . .
29
Parking . . . . . . . .............. . ...
14
Living Area Electrical System ... . ....
29
Starting Engine .... . .............
14
General
Information ............ . . 29
Automatic Transmission .......... .
15
120-Volt & 12-Volt
Turn Signals and
Lane Change Feature ...........
16
Converter and
BatteryCharger . . 29
Hazard Warning Flasher . . . . ......
16 External
Power ..
. ............... 30
Horn Control . ...... . . .
. . . .. . .... 16 Lighting System . . . . . . ............
31
Power Steering ...... . . . . . . .
...... 16
Monitor Panel . . .
. . . . . . . . ........ 31
Tilt Steering Wheel ...... . . .
. . . . . . 16
Onan Motor Generator . . . . . . . . . . . .
31
Cruise Control . ............ .
. .
. . .
17
Kohler Motor Generator . . . . . . . ...
32
Floor Controls . . ............ .
. .
. . . .
17 Living
Area Water System . . . . . . . . . . .
33
Brake System ....................
17
Filling Water
Tank . . . . . . . . . . . . . . .
35
Headlight Dimmer Switch ........ .
19
Headlight "Flicker . . ...............
19
External Water
Connection ........
35
Instrument Panel and Controls
... .... 20
Water Pump ...
. . . ...............
35
Speedometer and Odometer ........ 20
Water Heater . ...................
36

SUBJECT
Kitchen
Facilities ................ . . .
37
All Electric Refrigerato ........ . . . .
37
Gas/Electric Refrigerator . . . ....... 38
Kitchen
Range/Oven .. ........... 40
Kitchen Sink
and
Auxiliary Water
Purifier .........

43
Bathroom Facilities . . . . . . . ..........

43
Standard Toilet . . ...... . . . . . . ....
43
Recirculating Toilet ... . ..
. . . . . ....

43
Bathroom Sink and
Furnace .... . . . . . ....... . ..........
48
Furniture ..... . . ............... . . . .
50
In case of emergency .... . ....... ...
...... 53
Four-Way Hazard
Warning Flasher ... 53
Emergency Starting .................
53
Engine Coolant Caution ..... . . . .....

55
Jack Usage Instructions .... . ........

55
Towing Motor Home ............... .
56
Freeing Vehicle From Sand, Etc . ... . . 57
Emergency Exit
.........
. ......... . 57
Fire
Extinguisher ................... 57
Appearance Care . . . ........ . . .. ..... ...
. . 59
Care and
Cleaning of Interior
General
Information ..............

59
Vacuum
Cleaner . . . . . . . . ..........

59
Lap
Belt Care
........
. ...........

60
Interior
Glass ......... . ... . ......
60
TABLE
OF CONTENTS
PAGE NO .

SUBJECT
iii
PAGE NO .
Kitchen Sink .................... . 60
Cleaning Fabrics .. ...............

60
Removal of Specific Stains .........

60
Exterior Appearance Care . ..........

61
Bright Metal Parts . ..............

61
Exterior Glass . . . . . . . . ............

61
Polishing and Waxing ............. 62
Touch-up Paint . . . . . . ............ 62
Undercoating . .. ..... . ...........

62
Service and Maintenance . ........... . ..... 63
GMC Motor Home
Maintenance
Information
. . .................... 68
Explanation of Complete
Vehicle
Maintenance Schedule
. .. .......

68
Lube & General Information
.......

68
Safety Maintenance .... .
. . .......

69
Emission Control
Maintenance
. . ...
71
Motor Generator Maintenance
Details .... . .................
. . 72
Onan 4000/6000
Watt Motor
Generator
Maintenance Schedule ...
73
Kohler 4000 Watt
Motor Generator
Maintenance
Schedule . . . .........

73
Recommended Fluids
& Lubricants . . . 74
Lubrication Details
. ............. . . .

75
Engine ......... .
................ 75
Transmission .. .
. . . . .......... . . .

77
Shower Control Valve . . . . . . . . . . . 45
Accessibility . ............... . . . . . . . 63
Shower Head .. . ....... . . ........ 45
Exterior Compartments .. ......... 63
Thermasan System . . ...... . . . . . . ... 46
Engine
Accessibility .. . ........... 65
Ventilation . .. ................... . . 47
Roof Carrier .................... .
66
Windows ..................... . . . 47 Hoisting
Instructions ...............
. 66
Ceiling Vent . ................ . . . . 47
Complete Vehicle
Maintenance
Roof-Mounted Air Conditioner ...... 47
Schedule . ........................
67

SUBJECT
Final Drive ..... . .........
. . . . . . .

78
Steering System .............. . . . .

78
Brake System .................. . .

79
Servicing Details . ..................

79
Engine Cooling System . . . . ........

79
Engine Fuel System ...............

81
Maintenance ...................
91
Kohler Motor Generator
Maintenance ..... . .............
95
Wheels and Tires ... . . ............

96
Front Suspension
..... . . . . . . . . .... 99
Rear Suspension ..................
100
Thermasan System
. . ........... . . 101
Standard Toilet . .................
101
Recirculating
Toilet ...............
102
Draining
Holding Tank .. .........
103
Draining
Living Area Water System
. 104
TABLE OF
CONTENTS
PAGE NO .

SUBJECT

PAGE NO .
Sanitizing Living Area
Water
System ........................
105
Winterization . . . . ............... .
106
Vehicle Storage . . ......... . ...... .
106
New Vehicle Warranty ........ . ........
. . . 111
Emission Control Systems Information
Locations ........................
128
U .S . Zone Territories . . . . .... ........
131
U .S . Zone Offices . ........ .... ......
132
Mexico Zone Office .................
. 132
GM of CanadaLimited-Zone
Offices . 133
Sudden Service System ..............
134
After-Hour Service
Assistance ........ 134
Maintenance Manual . . . . ...........
134
Index .............................
135
Gas Station
Information . . . . ........ 141
LP Gas System . . . . . ... . . ....
. ... 84
And Warranty . . ......... ..... ..... .
115
Chassis Electrical System . . . . . .
... . 84
GeneralData and Specifications . . . .......
119
Living Area Electrical
System ..... 88
Owner Assistance . . . . . ........ . .
. ........ 127
Onan Motor Generator U .S . Motor Home Service Outlet

IMPORTANT INFORMATION
ON VEHICLE LOADING
CAUTION
The components of your Motor Home
are designed to provide satisfactory
service
if the vehicle is not loaded in
excess of
either the gross vehicle weight,
or the maximum
front and rear end
weights, specified
on
a
permanent place
which is
located behind the right engine
access door .
Overloading can create seri-
ous potential
safety hazards and can
also shorten the
service life
of
your ve-
hicle . Your local dealer
can advise you
concerning proper
loading conditions of
your vehicle .
When loading
the Motor Home, it is impor-
tant that it is
properly loaded . All items should
be loaded as
centrally and as low as possible .
This is essential to
maintain proper vehicle
handling . Even
though a single item may not
weigh much alone,
several of these items may
have considerable
weight . Proper loading is
essential .
MAXIMUM FRONT AND
REARAXLE WEIGHTS
FRONT AXLE CAPACITY
4,200
LBS
.
1L
GVW RATING 10,500 LBS .
TOTAL WEIGHT
AT
GROUND 10,500 LBS .
REARAXLECAPACITY
7,000 LBS .
u
Vehicle Loading (Model 230)
1
The weight of the load must be properly dis-
tributed over both the front and
the rear axles,
although not necessarily evenly . The plate shows
the maximum weight that the
front axle can
carry and the maximum weight that the rear
axles can carry . Note that the sum of these is
greater than the GVW, so that it is
not neces-
sarily proper to load
both axles, at the same
time, to the maximum capacity shown for each
.
The GVW rating represents the weight
that the
complete vehicle is
designed to carry, taking into
consideration the engine, transmission, frame,
spring, and tire
capabilities . Actual front and
rear end weights at the ground can only be
determined by weighing the vehicle .
This can
be accomplished through
highway weigh sta-
tions or other such commercial facilities . For
assistance in this regard, consult
your service
outlet .
FRONT CURB 3,800 LBS . REARCURB
4,800 LBS
.
FRONT BODY REAR BODY
AND LOAD 400 L B S . AND LOAD
2,200 L B S .
TOTAL 4,200 LBS . TOTAL 7,000 LBS .

FRONT
AXLE CAPACITY
4,200
LBS .
FRONT
CURB
FRONT BODY
AND LOAD
TOTAL
GVW RATING
10,500 LBS .
1
3,600 LBS .

REARCURB
REAR BODY
600 LBS .

AND
LOAD
4,200 LBS .

TOTAL
TOTAL WEIGHT AT
GROUND 10,500 LBS .
REAR
AXLE CAPACITY
7,000
LBS
.
6,000 LBS
.
1,000 LBS .
7,000 LBS .
O
GENERAL
MOTORS
CORPORATION
WARRANTY MAY BE VOIDED IF WEIGHT
EXCEEDS ANY OF THE RATINGS SHOWN .
GROSS VEHICLE WEIGHT INCLUDES WEIGHT OF
BASEVEHICLE, ALLADDED EQUIPMENT, DRIVER
AND PASSENGERS, AND ALL PROPERTY LOADED
INTO VEHICLE .
*REFER
TO OWNER'S MANUAL
FOR EQUIP-
MENT
REQUIRED
FOR INTERMEDIATE OR
MAXIMUM
GVW RATINGS,
AND FOR OTHER
LOADING INFORMATION, INCLUDING TIRE
INFLATION .
RATINGS IN POUNDS
GROSS VEHICLE WEIGHT
FOR
THIS VEHICLE
AS MANU-

*MAXIMUM
FACTURED
CAPABILITY
O
Vehicle Identification Plate
Vehicle
Loading (Model 260)
A-0414
GVW (GROSS VEHICLE WEIGHT)
The permanent plate located behind
the right
engine access door shows the "As Manufactured"
Gross Vehicle Weight Rating (GVW) and the
"Maximum Capability" rating for the Motor
Home to which it is attached .
The "As Manufactured" rating represents
the
vehicle's load carrying
capabilities as initially
manufactured .
The "Maximum Capability" rating shown on
the plate is the manufacturer's gross weight rat-
ing which is attainable for that vehicle, provided
the required optional equipment is installed .
"Gross Vehicle Weight" means the maximum
design weight of the Motor Home, including the
Motor Home itself, all items added to the Motor
Home after
it
has left the factory, and everything
that is loaded into (or onto)
the Motor Home .
IMPORTANT :
Under no conditions should racks,
carriers, luggage, tires, or any other items be
loaded on the front of the Motor Home so as to
block air flow and interfere with engine cooling .
If the vehicle is equipped with the optional
roof mounted carrier, trunk, or motorcycle rack,
the design weight limitations of these items must
not be exceeded . The roof mounted carrier has
a capacity of 250 lbs . The trunk has a capacity
MAXIMUM FRONT
END
WEIGHT AT GROUND
MAXIMUM REAR END
WEIGHT AT GROUND
VEHICLE
(DENT . NO .

of 250 lbs . The load on the motorcycle rack
must not exceed 250 lbs .
NOTE : The addition of these options does not
increase the maximum axle or gross vehicle
weight ratings of the vehicle .
EFFECT
ON
WARRANTY
Your GMC Motor Home New Vehicle
Warranty does not apply to any part of
your vehicle "which has been subject to
misuse ." Any part which fails because
of overloading has been subject to mis-
use within the meaning of this provision
of the Warranty .
TIRES
It is important that the tires on your vehicle
be of proper size, and be properly inflated . It is
important to avoid over-inflation as well as
under-inflation . Refer to "WHEELS AND
TIRES" later in
this
manual under "SERVIC-
ING DETAILS" for tire inflation information .
REAR BUMPER LOADING
Care
must be
taken
with
racks or temporary
attachments, when attached to the rear
bumper .
Such items could nullify the energy absorbing
capabilities of the rear bumper . Your GMC
Motor Home service outlet can advise you as to
suitable means of attachment .
For continuing satisfaction keep your Motor Home
all GM . General Motors Parts are identified by
one of these trademarks :
V
Delco

BEFORE DRIVING YOUR MOTOR HOME
DRIVER
CHECK LIST

10 .
BEFORE ENTERING VEHICLE
1 . See that windows, mirrors,
and lights are
clean .
2 . Check inflation condition of tires .
3 . Turn off LP gas valve on LP tank (See
CAUTION under "LP Gas System" in SER-
VICE AND MAINTENANCE section) .
4 . Check that sewer connection, all external
compartments, and filler openings are prop-
erly stowed or closed and/or locked .
5 . Check that items stored on exterior of ve-
hicle are securely lashed .
6 . Will any items stored on exterior of vehicle
present a clearance problem?
7 . Are there any rocks, posts, low-hanging lines
or branches under or near the vehicle you
must avoid before driving away?
8 . Check that area to rear of vehicle
is
clear if
about to back-up .
BEFORE DRIVING OFF
1 . Lock entrance door .
2 . Check that all windows and vents are in
suitable position for travel
(See
"Engine
Exhaust Gas Caution (Carbon Monoxide)"
at the
beginning
of STARTING AND
OP-
ERATING
VEHICLE section .
3 . Turn off living area
water pump
.
4 . Check that refrigerator door is fastened .
5 . Check that nothing heavy is stored in over-
head or high cabinets-it may fall out en-
route and cause injury .
6 . Close and secure bathroom, closet, and all
cabinet doors and drawers .
7 . Check that counter tops, range top, table
tops and shelves are clear-even small items
may become projectiles in an accident . It
is not safe to cook while underway-hot food
or liquid may scald in a sudden stop or
accident .
8 . Be sure all LP gas controls on furnace,
range/oven, and optional gas/electric re-
frigerator are turned off .
9 . Check that all interior stowage is securely
held .
Check that all lights and switches are set in
positions
suitable for travel .
11 . Position driver's
seat for comfort .
12 .
Check
that driver's and front passenger's
seat, and any other swivel-mounted seats
are locked in position .
13 .
Check adjustment of inside and outside
mirrors . Adjust curtains where necessary for
visibility .
14 . If vehicle is equipped with optional Power
Level System, check that both control knobs
are set to "TRAVEL" position . Check that
battery switch is in "BAT NORMAL" posi-
tion .
15 . Fasten lap belts .
16 . Check that warning light bulbs light when
key is turned to ON or START position .
17 . With engine running, check that warning
lights are now out .
18 . Be sure you understand your vehicle and
how to operate it and its systems safely .
19 . It is recommended that you refer to "TRIP
TIPS" and "DRIVING TIPS"
at the end
of this section for additional information .
CAUTION
Counter and table tops should not be
used for storage when underway-even
for light weight, small articles
.
They
might become dangerous
projectiles dur-
ing an
accident
. Heavy
items stored in
overhead or waist-high cabinets may
also cause injury if a sharp turn or stop
causes them to topple against inside of
cabinet door, forcing it open . Store
canned goods and other heavy items
down low .
INSIDE REARVIEWMIRROR
Switch inside mirror (see next page) to night
position to reduce glare from following head-
lights .
To raise or lower, grasp mirror and exert suffi-
cient pressure by pushing or pulling
to move
mirror up or down .

Inside Rearview Mirror
SEATS
The driver and passenger seats in the driver
compartment may be adjusted to suit an indi-
vidual's preference (except dual passenger seat) .
Tomove seat forward or backward, simply re-
lease the seat locking lever located on the left
side of the seat . Once released, exert slight body
pressure in the direction desired . Release lever
to lock the seat in the desired position .
The seats can be swiveled (except dual pas-
senger seat in Model 260) to provide easy en-
trance and exit . To turn swivel seat, release lock-
Seat Swivel Mechanisms
6
Seat Track Mechanism
ing mechanism by moving seat swivel
lever, then
turn seat .
CAUTION
Check that all swiveling seats
are locked
in position before driving
off . If
any
seat
swiveled during
an accident the occu-
pant
may be more likely injured . DO
NOT adjust the driver's seat swivel or
fore and aft mechanism while the ve-
hicle is moving . The seat could move
unexpectedly causing loss of control .
DUAL PASSENGER
SEAT

KEYS
Two sets of keys are furnished with your
Motor Home . These keys are for the locks in the
ignition switch, entrance door, glove box, ex-
ternal utilities compartment, and living area
water tank filler cap . The code number of the
ignition switch key is stamped on the "knock
out" plug in the key head . Your dealer removed
this plug and placed
it with the spare
keys in
the special key envelope
that was
given
to
you
at the time
of delivery . For
your
protection
record the number on this plug and the numbers
on the other keys . Keep these numbers in a safe
place, such as your wallet, NOT IN THE VE-
HICLE . In the event the original keys are lost,
duplicates can be made by your dealer or a
locksmith using the key code information . When
leaving the vehicle unattended, remove the keys
and lock the entrance door .
ENTRANCE DOOR
TYPE 1 DOOR LATCH
Door must be locked from outside the vehicle
by inserting the key into the door key lock and
turning . To unlock, turn in the counterclockwise
direction . Reverse the direction to lock .
To lock door
from inside
the
vehicle, push
lock button
IN .
To
unlock
and open
door from
inside, pull the locking button OUT and
lift or
push down on inside door handle .
Type 1 Door Latch
VIEWED FROM OUTSIDE VEHICLE
TYPE 2 DOOR LATCH
(Illustrated
on Next Page)
The entrance door may be locked from out-
side the vehicle by inserting the key into
the
door key lock and turning . To unlock, turn
in
the counterclockwise direction . Reverse direction
to
lock .
To lock the door from inside the vehicle, push
the left lock knob toward the rear of the vehicle
(to
the right) . To unlock and open door from
the inside, pull the left locking knob toward the
front of the
vehicle (to the left) and lift or
push down on
inside door handle .
All modelshave
as a standard safety feature
overriding door locks
. When locked, the door
latch mechanism is
inoperative, preventing in-
advertent opening of the door by
movement of
the inside handle .
The Type 2 door latch of
the Motor Home
also has a "dead bolt" lock that is
used as a
secondary lock .
REMINDER : Always lock
entrance door
when driving for greater
security in the
event of an accident, to help
keep chil-
dren from inadvertently opening
door,
and for security against entry by
un-
welcome persons while momentarily
stopped .

LAP BELTS
Your GMC Motor Home is equipped with lap
belts in the driver and front passenger seating
position (s), as well
as
certain other seating loca-
tions
in
the Motor Home . 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 and maintain tension
on the lap belt .
" 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 . If webbing is not pulled out far
enough to reach the buckle, let the belt re-
wind into the retractor to release lock mech-
anism, so belt can
be pulled out to the
proper
length .
" Position belt across lap
as LOW ON
HIPS
as possible . To reduce the
risk
of
sliding
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 .
NOTE :
Take care not to let the lap belt twist
while it is being rewound into the retractor .
The bulk of the twisted belt may cause the
retractor to jam so it will not rewind further,
Type 2 Door Latch
while at the same time the retractor's locking
mechanism prevents the belt from being with-
drawn . If a belt should become jammed, you
may be able to release it by pulling the belt
out far enough to untwist it . Otherwise the
retractor will require servicing .
Lap belts at seating positions other than the
front outboard positions-should
be positioned
and secured as above,
and adjusted to a SNUG
FIT by pulling on the end of
the belt extending
from the adjustable latch plate .
"
To
lengthen the lap belts at these seating po-
sitions,
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 . To lessen the chance
of
injury in the event of an accident -
never use
the same belt for more than
one person
at a time ; avoid wearing
belts in a
twisted condition ; do not allow
belts or buckles
to become pinched be-
tween the seat
structural (metallic) mem-
ber or in the door .

LAP BELT INSPECTION
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 luke-
warm water .
Do not bleach or dye belts since this may
severely weakenthem .
CHILD
RESTRAINT
Children in vehicles
should be restrained to
lessen the risk of injury
in accidents, sudden
stops or other
hazardous situations . In using any
infant or child restraint
system, read andcomply
with all
installation and usage instructions .
All
unused seat belts near the child should be
stowed
properly to help prevent them from
striking
him in the event of an accident . Lap
belts without storage provisions should have
buckles latched and belts adjusted to remove
slack .
VEHICLES NOT EQUIPPED
WITH
SPECIAL CHILD RESTRAINTS
If a child is traveling in
a vehicle not equipped
with a safe infant
or child restraint system, the
following
precautions should be taken :
1 . Infants
unable to sit up by themselves
should be
restrained by placing them in a cov-
ered,
padded bassinet placed crossways in
the
vehicle
(widthwise) on the rear-facing dinette
seat
. The bassinet should be securely
restrained
with
the regular vehicle lap belts
.
2 . 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
.
3 . A child who
can sit up by himself
but can-
not see out the
window should sit on a
firm
cushion with
the regular lap belt restraining
him
at the hips . The
cushion should
be as firm as
practical and
just high enough
to enable the
child to look
horizontally out of
the window .
The use
of a cushion should
be discontinued as
soon as the
child is old enough
to see out of the
windows
without it .
4 . It is recommended that
children be re-
strained properly at all
times when riding .
OPERATION IN
FOREIGN
COUNTRIES
Your vehicle's engine
is designed to operate
on fuel of approximately
91 research
octane
number or higher,
commonly sold in the
United
States or
Canada .
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 . To minimize
this pos-
sibility, write to GMC Truck
& Coach Division,
General Motors Corporation,
Pontiac, Michigan
48053 (or in Canada write
to General Motors
of Canada Limited,
Owner Relations Depart-
ment, 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 .
You
will be furnished information
on the
quality
of fuels available in the countries
in
which you plan to travel . It is recommended
that
you not operate your Motor Home
in any
country not having fuels meeting
the require-
ments of your vehicle engine .
Engine modifica-
tions are not available to
compensate for low
anti-knock quality fuels .
Operation of your ve-
hicle under conditions of
continuous or excessive
knocking constitutes
misuse of the engine for
which the manufacturer
is not responsible under
the terms of the
New Vehicle Warranty .

The Motor Home is
designed and intended to
be used primarily as a
recreational vehicle . Tow-
ing a trailer will affect
handling, durability and
economy . Maximum safety and
satisfaction de-
pends upon proper use of correct
equipmentand
avoiding overloads and other abusive
operation .
The maximum loaded trailer
weight which
the Motor Home can pull is 2,000
pounds . GMC
DOES NOT RECOMMEND TOWING
ANY
TRAILER UNLESS THE MOTOR
HOME IS
PROPERLY EQUIPPED . Information on
trail-
er
hauling capabilities, special equipment
re-
quired, and
available equipment can be
obtained by
writing to GMC Truck & Coach
Division, General
Motors Corporation, Techni-
cal Service
Department, Pontiac, Michigan
48053 . (Or in Canadaby
writing to General
Motors of Canada
Limited, Owner Relations
Department, Oshawa, Ontario .)
To assist in
attaining good handling of the
Motor Home-Trailer Combination,
it is impor-
tant 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 . The allow-
able passenger and
cargo load (GVW) of this
vehicle is reduced by an amount
equal
to
the
trailer tongue load on the trailer hitch .
Refer
to page 1 for further information on vehicle
loading .
MAINTENANCE
TRAILER
HAULING
More
frequent Motor Home maintenance is
required when being used to pull a
trailer . Refer
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 Motor Home be operated
for 500 miles
before trailer towing
. If
it is
necessary to tow during this period, avoid speeds
over 50 MPH, and full throttle starts .
10
CAUTIONS
1 . Trailer brakes are
required on trailers
over 1,000
lbs . loaded weight .
2 . DO NOT
tap into vehicle's hydraulic
brake system if operation of the
trailer brake system requires more
than 0 .02 cu .-in . of fluid displacement
from the vehicle's master cylinder .
The Motor Home's master cylinder
fluid capacity will not
be to
operate both vehicle
and trailer brakes
under all conditions
of use if more
than 0 .02
cu .-in . of fluid displacement
is required .
3 . Whenever a trailer hitch is removed,
be certain to have any mounting holes
in underbody properly sealed to pre-
vent possible entry of exhaust fumes,
dirt or water . (See "ENGINE EXHAUST
GAS CAUTION" in the following sec-
tion .)
TRIP TIPS
A small amount
of preparation prior to a trip
will
save a lot of time when traveling .
When loading
heavy items into your Motor
Home
try
to store them as lowand centrally as
possible . This will aid performance and handling
of the vehicle . Remember even though an item
may not weigh much individually the sum
weight of several of these articles may be sub-
stantial .
CAUTION
When transporting luggage or other
cargo in your Motor Home it is recom-
mended that all articles be secured in
place . This precaution will help prevent
such items from becoming projectiles in
the event of an
accident
and possibly
causing
serious personal
injury or prop-
erty damage .
The following emergencyequipment
is
recom-
mended, at minimum
Fire Extinguisher
Hydraulic Jack and LugWrench
Spare Tire
Flashlight
First Aid Kit
Road Emergency Flares
Basic Tool Kit

These items
might be found useful :
Plastic Bucket and
Funnel
Water Hose and "Y"
Connection, in case of
two units on one water
system
Level
Shovel
Spare
Automotive Fuses and
Bulbs
2"
x
4"
Chocks or Blocks
The following checks should be
made before
starting on a
trip
OUTSIDE
VEHICLE
1 . Run through
"Driver Check List" at
the
beginning of this section
.
2 .
Check engine oil level .
3 .
Check fluid levels on all batteries .
4 . Visually
inspect radiator coolant level
.
5 . Fill
windshield washer reservoir .
6 . Check tire
pressure, and inspect tires for
road damage, foreign
objects .
7 . Check operation of all
outside lights .
8 .
Check that all exterior vents
are unob-
structed .
9 . Check
and empty holding tank .
INSIDE VEHICLE
1 . Check operation of
optional Power Level
System .
2 . Check gasoline supply .
3 .
Check transmission fluid level .
4 . Check
power steering fluid level .
5 . Check operation of
windshield wipers and
windshield washers .
6 . Check operation of brakes .
7 . Check operation of interior lights .
8 .
Check all appliances and fixtures for proper
operation
.
9 . Check operation of
motor generator .
10 . Check and fill living area
water system
11 . Check and fill LP gas tank .
12 . Check "Complete Vehicle Maintenance
Schedule" to make sure all periodic main-
tenance and safety checks have been per-
formed .
13 . After the vehicle has been
loaded, check to
see that the vehicle's Gross Vehicle
Weight,
and front and rear axle capacities have not
been exceeded . This check should be made
fully loaded including passengers . (Refer
to the
"IMPORTANT INFORMATION
ON VEHICLE LOADING" section of
this
manual for further information .)
Before leaving any camp-site
make sure all
litter has
been picked up .
When traveling in
winter it is recommended
that the water tank not be
filled until the des-
tination is reached . This will ensure that the
vehicle has thoroughly warmed up . The water
and
holding tank systems should be drained be-
fore leaving
for home . Also, at this time, put
some non-toxic, non-flammable
anti-freeze into
the sink and shower traps . Heat tape
has been
found useful in preventing pipe freeze-up,
wherepower is available . Some non-toxic, non-
flammable
anti-freeze in the holding tank will
help keep the tank contents from
freezing . The
recirculating toilet should be drained immedi-
ately at the end of the trip .
DRIVING TIPS
The Motor Home
driver
controls
are auto-
motive-type to make the vehicle as
comfortable
as possible . The steering and braking controls are
power
assisted to help make driving as effortless
as
possible . However, it must be remembered
that the Motor Home is
much higher, wider,
and heavier than a family automobile .
Since the Motor Home is 9-ft . 4-in . high,
with the roof mounted air conditioner, additional
care is required to watch for low bridges and
over-passes . TREE BRANCHESCANDO
CONSIDERABLE DAMAGE TO THE WIND-
SHIELD OR ROOF OF
THE VEHICLE TOO,
SO WATCH FOR THEM .
The Motor Home power-to-weight ratio is
lower than that of the average automobile .
Therefore
it
is essential
to
compensate for less
acceleration when moving into traffic, or when
passing another vehicle .
NEW VEHICLE OPERATING SPEEDS
Driving speeds for your new Motor Home
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 .
If
your initial mileage is of the around-town vari-
ety, which is considered "severe service" espe-
cially in cold weather, be sure to include some
25
to 50 mile highway trips during the break-
in period
and vary the vehicle's speed .

STARTING AND
OPERATING
VEHICLE
ENGINE EXHAUST
GAS CAUTION
(CARBON
MONOXIDE)
Avoid
inhaling exhaust gases because
they contain carbon monoxide,
which
by itself is colorless and
odorless . Carbon monoxide is a dangerous
gas
that can cause unconsciousness
and is potentially lethal .
If, at any time, you suspect
that exhaust fumes are entering the
Motor
Home from any source have
the cause determined and corrected
as soon
as possible . If you must drive
before the cause is corrected, drive
only with
ALL except two rear
windows FULLY open .
The best protection
against carbon monoxide entry into the
vehicle body
is a properly maintained
engine exhaust system, body and
body ventilation
system . It is
recommended 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 "Complete Vehicle Maintenance
Schedule" for inspection pro-
cedure .
To allow proper operation
of the vehicle's ventilation system, keep front
inlet grille clear of snow, leaves,
or other obstructions at all times .
SITTING IN A PARKED
VEHICLE WITH ENGINE RUNNING FOR
AN EX-
TENDED PERIOD OF TIME
IS NOT RECOMMENDED .
Do not run engine
in confined areas such as garages any
more than
needed to
move vehicle in or out of area . When vehicle
is stopped in an
UNCONFINED
area with the 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 :
1 .
On vehicles not equipped with automotive
air conditioning, set fan to
medium or high speed and upper
control lever to any position except "OFF ."
Lower control lever should
be adjusted to any position except extreme left
"RECIRC ."
2 . On vehicles equipped
with automotive Air Conditioning, set fan to
medium or 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 should be closed while driving to avoid drawing
dangerous
exhaust gases into the vehicle through those
openings
.
In addi-
tion,
it is recommended that roof vent(s) be closed while
driving . If,
for
some reason, 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 .
Adjust heating
or cooling system to force outside air into the vehicle as
described in
Step 1 or 2 above but with fan set at high speed .
Air vents in
the instrument panel should be fully open .
It is
important that the inside engine cover be properly seated to prevent
possible
leakage of exhaust fumes into the vehicle through this opening .
See "LIVING AREA FACILITIES CAUTION (CARBON MONOXIDE)" on
page 29 .
1 3

ANTI-THEFT STEERING
COLUMN LOCK
The anti-theft ignition switch, located on the
right side of the steering column, has five posi-
tions
B C D
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
STEERING COLUMN CONTROLS
1
4
ACCESSORY-Permits operation of
elec-
trical accessories when the
engine
is not running . To
engage, push
key in and turn
toward you
(counterclock-
wise) .
LOCK

-Normal parking position,
locks
ignition 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 transmis-
sion 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
.
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
.
PARKING
When leaving the driver's seat unattended
SET PARKING BRAKE FIRST .
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 .
STARTING
ENGINE
1 . Apply the
parking brake .
2 .
Place the transmission
selector in "P" or
"N" ("P"
is preferred) . A starter
safety switch
is designed to
prevent starter operation
while
the transmission
selector is in any drive position
.
(If it is necessary to
re-start the engine with the
vehicle moving, place the
selector lever in "N" .)
3 . Depress accelerator pedal and
activate
starter as outlined in the following, for different
conditions
.

COLD ENGINE
Fully depress accelerator
pedal and slowly
release . With foot off the pedal,
crank the engine
by
turning the ignition key to the
"START"
position-release
when engine starts . If engine
starts but fails to run,
repeat this procedure .
When engine is running smoothly (approx
. 30
seconds) the idle speed may be reduced
by
slightly
depressing the accelerator pedal
and
then slowly
releasing .
CAUTION
Extended
running of the engine (5
minutes or more)
without depressing the
accelerator pedal, could
cause damage
to the engine or exhaust system
due to
overheating .
WARM ENGINE
Depress accelerator pedal about halfway
and
hold
while cranking the engine .
EXTREMELY
COLD WEATHER (BELOW
0° F .)
OR AFTER
VEHICLE HAS BEEN
STANDING
IDLE FOR
SEVERAL DAYS
Fully depress
and release accelerator pedal
two or three times
before cranking the engine .
With foot off the accelerator
pedal, crank the
engine by turning the key to the
start position
- release
key when engine starts .
IF ENGINE
FAILS TO START :
First, fully
depress and release the
accelera-
tor pedal
several times, then remove
foot
from accelerator pedal
and crank engine .
If engine still does not
start, fully depress
the
accelerator pedal and hold to
the floor
while
cranking the engine .
If the
engine has been flooded with gasoline,
it may start to
run but not have enough
power to keep
running . In this case, continue
cranking with the accelerator
pedal fully de-
pressed
until the engine cleans itself of
excess
gasoline
and runs smoothly .
If engine
doesn't crank properly due to
a
discharged main battery
(automotive bat-
tery), place the battery switch
in the "BAT
BOOST" position . Return the
switch to the
"BAT NORMAL" position when
engine
starts .
NOTE : Do not continue cranking the engine
for
more than 30 seconds
at a time to prevent start-
ing overheating .
1 5
Transmission
Shift Indicator
andSpeedometer
AUTOMATIC TRANSMISSION
The
transmission selector lever is located on
the right side of the
steering column and the
shift indicator is located in
the bottom section of
the speedometer cluster on the dash
.
"PARK"-Transmission lock
when parking
or
while starting the engine . Pull the
selector
lever
towards you to select or release
this
position . Never
move the selector lever to
"PARK" position
unless the vehicle is com-
pletely stopped .
"NEUTRAL" is the only
other position in which your
Motor Home
may
be started .
REVERSE
"R"-For backing the
Motor
Home .
Bring the vehicle to a complete
stop
before moving
the selector lever into Reverse
.
NEUTRAL "N"-
The out-of-gear position
.
It is provided for starting
a stalled engine
while the Motor Home is
in motion or run-
ning the engine while standing with
brake
applied . DO
NOT COAST IN
NEUTRAL .
DRIVE
RANGE "D"- The driving range for
city and highway
driving . 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"

Turn
Signal Lever
down-hill .
The selector lever may be moved
from
"D" to "S" and vice versa, under most
operating conditions . "SUPER"
should not
be used at speeds above
75
MPH
.
TURN SIGNAL AND
LANE
CHANGE FEATURE
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
turn and "B" for left
turn
.
Lever will remain
in position without
manual effort until the
turn is completed,
then cancel automatically .
LANE CHANGE
- Move lever to the detent
position
"C" for change to right
lane or to
"D" for
change to left lane
. Hold lever in
position until lane
maneuver is completed,
then release . Lever
will return to "OFF"
position .
LOW "L"-Available for
heavy pulling
through mud or
sand and for engine braking
when descending
steep hills . The selector lever
may
be moved to "L" at any speed but the
transmission will only shift automatically
into Low range when the vehicle
speed is
under approximately 40 MPH . The
trans-
mission will not upshift from
Low range as
long as the selector
lever is in the "L" position .
CAUTION
Before descending a steep or long grade
-down a mountain
or
hillside-reduce
speed and shift into a
lower range . Un-
der such conditions,
use the brakes spar-
ingly to prevent
them from overheating
-which
reduces brake effectiveness . Use
caution
when shifting into lower range
or lower gear on slippery surfaces with
vehicle moving-the abrupt engine brak-
ing action could cause the front wheels
to skid .
HAZARD WARNING
FLASHER
For
operation of hazard warning flasher,
see
"In
Case of Emergency" later in
this manual .
HORN CONTROL
The horn
is actuated by depressing the rec-
tangular shaped GMC button located in the
center of the steering wheel .
POWER STEERING
If the steering
system power assist fails due
to some
malfunction, or because the engine has
stalled, the Motor Home can still be steered .
However, much greater effort is required, par-
ticularly in sharp turns .
TILT STEERING WHEEL
FORCED DOWNSHIFT - When additional
acceleration is desired to pass moving ve-
hicles or to climb steep
grades at speeds
between approximately
35 and 65 MPH, the
transmission
can be downshifted by depress-
ing the
accelerator pedal completely to the
floor .
It is also possible to obtain a forced
downshift in "DRIVE" range at speeds under
35 MPH by depressing the accelerator
pedal
part way down .
The optional 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 .
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 .
1 F

CRUISE CONTROL
The optional Cruise Control is an automatic
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 econ-
omy on turnpikes, and other non-congested
highways .
TO OPERATE - The Cruise Control engage-
ment button is located in the end of the turn
signal lever . Accelerate the vehicle
to
the
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 - Ac-
celerate the vehicle to the desired higher
speed, push in the engagement button fully
and release slowly .
TO RESET
AT A SLOWER SPEED -
Depress the engagement button fully and
HOLD . Allow vehicle to decelerate . When
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 .
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
slip-
pery roads . With the Cruise
Control
en-
gaged, releasing
the accelerator pedal
does not permit
engine speed to return
to idle .
BRAKE
SYSTEM
The Motor Home is equipped with
a Dual
Hydraulic Split System
With Power Assist . It is
also equipped
with disc type brakes on the front
wheels and drum
type brakes on the tandem
rear
wheels .
It 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 .
FLOOR
CONTROLS
1 7
Tilt Steering Wheel
Cruise Control
Lever
CAUTION
Driving through deepwater may wet
the brakes and adversely affect brake
performance so that the vehicle will not
slow down at the usual rate . Applying
the brakes lightly will indicate whether
they have been so affected . To dry them
quickly, lightly apply the brakes while
maintaining a safe forwardspeed with
an assured clear distance ahead until
brake performance returns to normal .