Front Wheel Bearing; Front Suspension - GMC 1975 Motorhome Operating Manual

Location-Front Ride Height Adjustment
CAUTION
If any wheel experiences a single stud
failure caused by a loose-running wheel,
all wheel studs should be replaced .
A loose-running wheel may cause
only one stud to breuk, but several more
studs may become fatigued to the point
of failure, but not actually breaking .
Replacing only the broken stud and re-
mounting wheel will then set the stage
for a second and possibly more serious
failure . If holes in the wheel have be-
come elongated or enlarged, replace
wheel .
Tighten wheel stud nuts as follows :
1 . Install all nuts loosely, then finger-tighten
only the nuts marked by arrows.
2. Tighten all nuts to specified torque in se-
quence illustrated. Never use oil or grease on
studs or nuts.
See IN CASE OF EMERGENCY section for
procedure used to change tire.
FRONT WHEEL BEARING
Periodic maintenance on the front wheel bear-
ing is not required. The front wheel bearing is a
sealed bearing and non-adjustable .
REAR WHEEL BEARING ADJUSTMENT
A periodic rear wheel bearing repack is re-
quired as indicated in Maintenance Schedule
78
folder . These bearings should be cleaned and
repacked with Lithium Soap Multi-Purpose
Grease Meeting GM Specification 6031-M or
equivalent.
The adjustment of the bearing must be done
with the wheel off the floor, and rotating the
wheel while tightening nut. At this time make
the torque readings as follows :
1 . Tighten adjusting nut with a torque wrench
to 25-30 foot-pounds with wheel rotating to en-
sure that all parts are properly seated and
threads are free.
2. Back off nut one-half turn. Re-tighten nut
finger-tight.
3. If unable to install cotter pin at finger-
tight position, back off one slot, then secure with
cotter pin.
4. End play should be .001" to .005". Also
at this interval the rear suspension control arms
should be lubricated. This is accomplished at
the fittings between the rear wheels.
FRONT SUSPENSION
The front suspension consists of control arms,
stabilizer bar, shock absorbers and a right and
left torsion bar. The front suspension compo-
nents are designed to provide satisfactory serv-
ice, ride, and handling if not overloaded and ad-
justed to specified vehicle front end ride height.
No maintenance other than lubrication is
normally required. Refer to lubrication infor-
mation given earlier in this section for intervals
and lubrication points.
The front of the torsion bar is attached to the
lower control arm. The rear of the torsion bar
is mounted into an adjustable arm. The front
ride height is controlled by this adjustment .
The simplest way to adjust is to move arm
slightly to achieve ride height and drive unit a
few blocks so as to overcome delaying action.