GMC 1975 Motorhome Operating Manual page 32

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POWER LEVEL SYSTEM
The optional Power Level System provides
the ability to level the vehicle at campsite or
parking area where the ground is not level. This
system overrides the automatic leveling feature
that maintains a constant ride height at the rear
tandem suspension. The Power Level System can
raise or lower the rear of the vehicle approxi-
mately 4 inches from normal ride height .
The Power Level Controls are located to the
right of the steering wheel at the lower portion
of the dash panel .
NORMAL OPERATION
The controls consist of two knobs labeled :
"LEFT REAR" and "RIGHT REAR." Each
knob has four positions and is used as follows :
"RAISE"-Knob in this position will raise rear
of vehicle to any desired level, up to a maximum
of 4 inches above normal ride height. When
desired height is reached, turn indicator on
knob to "HOLD" position.
"HOLD"-When indicator line on knob is turned
to this position the appropriate side of the vehi-
cle will remain at that height. This can be done
after being either in the "RAISE" or "LOWER"
position. It is recommended that when vehicle is
parked that the two knobs be turned to "HOLD."
"LOWER"-With the indicator line in this posi-
tion the appropriate side of the vehicle will
lower a maximum of 4 inches below normal ride
height . In order to maintain a desired height
turn indicator on knob to "HOLD."
Power Level System Controls
2 6
"TRAVEL"-Whenever driving vehicle on high-
ways or improved roads place indicator line in
"TRAVEL" position. This will automatically
maintain a constant ride height at the rear (ap-
prox. 8-inch ground clearance at rear) . A re-
minder light in the dash panel is designed to
light any time the engine is running and the
transmission selector lever is moved to "D"
(Drive Range) .
When using Power Level the vehicle engine
need not be running to operate the system, how-
ever, the ignition key must be in the "ACCES-
SORY" position.
A glass of water or a bubble type level when
placed in a normally level location inside the
vehicle can be used to assist in determining the
desired level condition.
OFF-ROAD OPERATION
In order to gain maximum ground clearance
both control knobs should be placed in the
"RAISE" position. It is recommended that a
speed of 1 S MPH should not be exceeded since
the air suspension in this position has maximum
pressure supplied.
EMERGENCY OPERATION
In the event of total air loss ("'LOW AIR" warn .
ing light illurninated) for any reason, the vehicle
may be driven at a speed of 5-15 MPH (depend-
ing on road surface) with the rear of the vehicle
in the fully "DOWN" position . Care should be
exercised since ground clearance at the rear will
be at a minimum . Vehicle should be taken to
neorest dealer .

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