GMC 1982 Light Duty Truck Service Manual page 346

3C-4 FRONT SUSPENSION
2. TIG HTEN THE NU T T O
12 FT. LBS. FULLY SEAT
B E A R IN G S- THIS
O V E R C O M E S A N Y BURRS
O N THREADS.
SNUG
H A N D
THE N U T
6. WHEN THE BEARING IS PROPERLY
ADJUSTED THERE WILL BE FROM
. 0 0 1 - 005 INCHES END-PLAY
(LOOSENESS).
Fig. 3C-3~Wheel Bearing Adjustment
SHOCK ABSORBER DIAGNOSIS
O N VEHICLE C H EC K S
(Follow the Procedures Outlined Below in the Order
Indicated).
Preliminary Inspection and Ride Test:
Tire Pressure
Check tire pressure compare to vehicle specifications
and adjust as required. Poor vehicle control and ride
complaints are caused in many cases by improper tire
inflation.
Special Su sp e n sio n E q u ip m e n t
Check Service Parts Identification Sticker for any
special suspension equipment; such as, a heavy duty suspen­
sion. Vehicles equipped with this type of option have a
somewhat stiffer or harsh ride, and this should be kept in
mind during the following tests. If complaint about stiffness
should occur while vehicle is still new (under 5,000 miles) (8
BACK OFF NUT
UNTIL JUST LOOSE
P O S ITIO N .
5. LOOSEN NUT UNTIL EITHER HOLE
IN THE SPINDLE LINES UP WITH
A SLOT IN THE NUT-THEN
INSERT COTTER PIN.
NOTE: BEND ENDS O F COTTER PIN
A G A IN S T NUT, CUT OFF EXTRA
LENGTH T O PREVENT
INTERFERENCE W IT H DUST CAP.
DIAGNOSIS
AD JU STM EN T OF W HEEL B E A R IN G S (FIG. 3C-3)
1. Remove hub cap or wheel disc from wheel.
2. Remove dust cap from hub.
3. Remove cotter pin from spindle and spindle nut.
4. Tighten the spindle nut to 16 N-m (12 ft. lbs.) while
turning the wheel assembly forward by hand to fully
seat the bearings. This will remove any grease or burrs
which could cause excessive wheel bearing play later.
See Fig. 3C-3.
5. Back off the nut to the "just loose" position.
6. Hand tighten the spindle nut. Loosen spindle nut until
either hole in the spindle lines up with a slot in the nut.
(N ot more than 1 /2 flat).
7. Install new cotter pin. Bend the ends of the cotter pin
against nut, cut off extra length to ensure ends will not
interfere with the dust cap.
8. Measure the looseness in the hub assembly. There will
be from .025 mm (.001) to .127 mm (.005 inches) end
play when properly adjusted.
9. Install dust cap on hub.
10. Replace the wheel cover or hub cap.
11. Lower vehicle to floor.
12. Perform the same operation for each front wheel.
000 km), owner should be advised to have ride rechecked
after 7,000 to 8,000 miles (1 1 200 to 12 800 km).
Vehicle Load C o n d itio n s
Note any exceptional load conditions under which the
owner normally operates the vehicle; such as, large tool
boxes full of tools, pick up bed full etc. If exceptional loading
is apparent, check the distribution of this weight. Note if it is
all toward one side of the vehicle or at the extreme rear of
the vehicle. Reposition load as required to obtain a more
uniform weight distribution.
C heck Vehicle Ride a n d H a n d lin g
After completing previous checks, ride vehicle with
owner to determine if problem has been corrected or to
definitely establish type of problem that still exists. If
problem still exists (poor handling, bottoming, noise, ride
sway, etc.), proceed.
Inspectin g a n d Testing the Shocks
Three procedures are included in this step. Thet are (a)
Bounce Test, (b) Inspecting Shock Mountings for Noise