Rear Suspension; Underbody Maintenance - GMC 1975 Motorhome Operating Manual

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FRONT
24 3/8"
FRAME
GROUND LEVEL
FRONT RIDE HEIGHT 13 1/8" ± 1/4"
NOTE : Ride height is measured from top of
elongated slot in frame rail to ground level . Tire
inflation should be checked prior to making any
ride height adjustment.
Ride height should be adjusted by raising
vehicle to relieve strain on adjusting bolt. Lubri-
cate adjusting bolt with chassis grease. Adjust-
ment is made by repositioning adjusting bolt
to wind-up and unwind torsion bar. Whenever
ride height is changed, be sure to check front
end alignment and readjust if necessary.
NOTE : Overloading and incorrect ride height
can create serious problems and shorten the
service life of the vehicle . Adjust front suspen-
sion ride height to specifications shown.
MAINTENANCE
REAR SUSPENSION
The rear suspension consists of control arms,
mounting brackets, air bellows, shock absorbers,
air compressor, air reserve tank, and height con-
trol valves. The system operates automatically
as load varies, and is designed to maintain a
constant frame height .
NOTE: Ride height is measured from top of
elongated slot in frame rail to ground level. Tire
inflation should be checked prior to making any
ride height adjustments .
The rear suspension can be manually ad-
justed for variations in load distribution. Adjust-
ment is made at the adjustment nut on the
height control valve arm .
1. Drain air reservoir under front of vehicle
to remove moisture .
Checking Vehicle Ride Height
79
23' MODEL
40 3/8"
26' MODEL
56 3/8"
Iti
~
. .
.k
REAR RIDE HEIGHT 11 11/16" ± 1/4"
2. The air compressor must periodically have
the air filter washed with soap and water solu-
tion or replaced. Filter should be serviced at
intervals specified in Maintenance Schedule
folder .
NOTE : Occasionally check air bellows .to see if
they are caked with accumulated mud deposits.
If deposits are present remove them from air
bellows.
UNDERBODY MAINTENANCE
The effects of salt and other corrosive mate-
rials used for ice and snow removal and dust
control can result in accelerated rusting and
deterioration of underbody components such as
brake and fuel lines, frame, exhaust system,
brackets, parking brake cables . These corrosive
Location-Rear Ride Height Adjustment

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