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PART 20-1- MAINTENANCE OPERATIONS
20-17
FIG. 37-
Checking Preload
ing adjuster lock nut, and tighten or
back off the bearing adjuster (Fig. 38)
to bring the preload within the speci-
fied
limits.
4. Tighten the steering shaft bear-
ing adjuster lock nut, and recheck the
preload.
5. Turn the steering wheel slowly
to either
stop.
Turn gently against
the stop to avoid possible dam-
age to the ball return guides.
Then rotate the wheel 2! turns to
centre the ball nut.
6. Turn the sector adjusting screw
clockwise until the specified pull
(Part 3-6) is necessary to rotate the
worm past its centre high spot (Fig.
37).
No perceptible backlash is per-
missible at 300 on either side of
centre.
7. While holding the sector adjust-
ing screw, tighten the lock nut to
specification and recheck the back-
lash
adjustment.
8. Connect the Pitman arm to the
sector shaft and torque to specifica-
tion.
I'IWI PWG
ADJUSTB LOCK NUT
SECTOI SHAFT
ADJUSTING SCREW
FIG. 38-
Typical Steering Gear
Adjustments
CHECK BRAKE LINES AND LINING
DRUM BRAKES
Raise all four wheels. Remove one
of the front brake drums, and inspect
the drum and the linings (the wheel
bearings should be inspected at this
time and repacked if necessary). Do
not let oil or grease touch the
drum or the linings. If the linings
are worn to within
"3~
inch of the
rivet heads on rivetted linings or shoe
on bonded linings, replace or reline
both sets (primary and secondary) on
the front or rear wheels. Under no cir-
cumstances replace one lining
only, or one wheel set. Both front
wheel sets or both rear wheel
sets should be replaced whenever
a respective lining or shoe is
worn or damaged. If the drum
braking surface is excessively scored,
refinish it. The condition of the re-
maining front linings is usually about
the same as that of the one inspected.
The rear brake linings may also need
replacing at the same time.
FRONT WHEEL DISC BRAKES
Raise all four wheels. Remove one
of the front wheel and tyre assem-
blies, and inspect the disc caliper,
and linings (the wheel bearings
should be inspected at this time and
repacked if necessary). Do not let
oil or grease touch the disc or
the linings. If the linings are V'{Orn
to within 0.030 inch of the surface of
the shoe, replace both sets of shoe
and lining assemblies (inboard and
outboard) on the front wheels.
Under no circumstances replace
one shoe and lining assembly
only, or one wheel set. Both front
wheel sets should be replaced
whenever a respective shoe and
lining is worn or damaged.
If the disc braking surface is
excessively scored, distorted, warped,
worn or shows excessive runout, it
should be replaced.
If
the caliper is
cracked or otherwise damaged, it
must be replaced as a unit.
With the parking brakes in the
fully released position, check the
brake cables. The cable adjustment
should be just tight enough to remove
the slack. Excessive tightening
may pull the brake shoes off
their anchors.
Check all brake lines for leakage or
physical damage and replace or repair
as .required.
CLEAN AND PACK FRONT WHEEL
BEARINGS
DRUM BRAKES
1. Raise the car until the wheel and
tyre clear the floor.
2. Remove the wheel cover or hub
cap. Remove the grease cap from the
hub. Remove the cotter pin, nut lock,
adjusting nut, and flat washer from
the spindle. Remove the outer bear-
ing cone and roller assembly.
3, Pull the wheel, hub, and drum
assembly off the wheel spindle.
4. Remove the grease retainer and
the inner bearing cone and roller
assembly from the hub with a drift.
5. Clean the lubricant off the inner
and outer bearing cups with solvent
and inspect the cups for scratches,
pits, excessive wear, and other
damage. If the cups are worn or
damaged, remove them with a drift.
6. Thoroughly clean the inner and
outer bearing cones and rollers with
solvent, and dry them thoroughly.
Do not spin the bearings dry
with compressed air.
7. Inspect the cone and roller
assemblies for wear or damage, and
replace them if necessary. The cone
and roller assemblies and the
bearings cups should be replaced
as a unit if damage to either is
encountered.
8. Thoroughly clean the spindle
and the inside of the hub with
solvent to remove all old lubricant.
Cover the spindle with a clean
cloth, and brush all loose dust and
dirt from the brake assembly. To
prevent
getting
dirt
on
the
spindle, carefully remove the
cloth from the spindle.
9. If the inner
and/
or outer bear-
ing cup(s) were removed, install the
replacement cup(s) in the hub. Be
sure to seat the cups properly
in the hub.
. 10. No grease should be packed
mto the hubs between the bearing
cups.
11. All old grease should be com-
pletely cleaned from the bearings
before repacking them with new
grease. Pack the bearing cone and
roller assemblies with wheel bearing
grease. A bearing packer is desirable
for this operation. If a packer is not
available, work as much lubricant as
possible between the rollers
and•
cages. Lubricate the cone surfaces
with grease.
12. Place the inner bearing cone
and
~oller
assembly in the inner cup,
and mstall the new grease retainer.
Be sure that the retainer is pro-
perly seated. Smear wheel bear-
ing grease around seal lip.
13. Install the wheel, hub, and
drum assembly on the wheel spindle.
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