GMC 1982 Light Duty Truck Service Manual page 345

NOTICE:
See N O T IC E on page 1 of this section
regarding the fasteners referred to in the maintenance
and adjustment procedures below.
W H E E L B E A R IN G S -C H E C K A D J U S T M E N T
NOTICE:
Tapered roller bearings are used on all series
vehicles and they have a slightly loose feel when
properly adjusted. A design feature of front wheel taper
roller bearings is that they must N E V ER be pre-
loaded. Damage can result by the steady thrust on
roller ends which comes from preloading.
1. Raise vehicle and support at front lower control arm.
Fig. 3C-2--Front Suspension - G-Typical
MAINTENANCE AND ADJUSTMENTS
2. Spin wheel to check for unusual noise or roughness.
3. If bearings are noisy, tight, or excessively loose, they
should be cleaned, inspected and relubricated prior to
adjustment. If it is necessary to inspect bearings, see
"Wheel Hubs, Bearings" under "Component Parts
Replacement."
To check for tight or loose bearings, grip the tire at the
top and bottom and move the wheel assembly in and out
on the spindle. Measure movement of hub assembly. If
movement is less than .025 mm (.001 ") or greater than
.127 mm (.0 0 5 " ), adjust bearings per adjustment
procedure.
FRONT SUSPENSION 3C-3