Cadillac 60 Series 1963 Shop Manual page 64

POWER STEERING
5-5
a. Thrust Bearing Preload Check
(2 Turns Off-Center)
1. Remove pitman arm from drag link using
Puller Tool, J-8990, Fig. 5-6.
2. Check for any distortion or binding inflexible
coupling. Correct as necessary (See Note 6).
3. Turn steering wheel two turns "off center",
just away from stops, and use a spring tension
scale with a piece of tag wire or string to measure
pull on steering wheel through an arc not exceed-
ing one inch, Fig. 5-7. Total pull should be be-
tween 4 and 12 ounces (thrust bearing and
friction).
4. If "off-center" pull is greater or less than
specified, loosen adjuster plug lock nut and back
off adjuster plug 1/8 turn, using Spanner Wrench,
J-7624. Fig. 5-7 Checking "Off Center" Pull of Wheel
NOTE: If position of holes in adjuster plug
is such that there is insufficient clearance for
using Spanner Wrench, insert a #10 bolt 3/4 inch
long in one of the adjuster plug holes and rotate
flexible coupling until lower flange contacts
bolt. Then back off adjuster plug 1/8 turn.
5. Recheck steering wheel "pull" with wheel
two turns off-center.
6. Adjust preload by tightening adjuster plug to
obtain 2 to 6 ounces (at rim of steering wheel) in
excess of total drag that was just measured with
adjuster plug backed-off 1/8 turn.
7. Tighten adjuster plug lock nut and recheck
preload to insure that plug did not move when nut
was tightened.
Fig. 5-6 Disconnecting Pitman Arm at Drag Link
b. Checking Worm and Ball Preload
(V2 Turn Off-Center)
1. Locate center of steering wheel travel and
turn wheel 1/2 turn "off-center".
2. With wheel 1/2 turn "off-center", measure
and record total pull through an arc not exceeding
one inch. Due to worm and ball preload, the total
pull should be from 2 to 8 ounces in excess of the
two turns "off-center" pull previously recorded.
3. If total pull is less than one ounce or more
than 9 ounces in excess of the two turns "off-
center" pull, steering gear must be removed from
car and disassembled for replacement of worm
shaft balls, see note 12e.
4. Check for roughness in worm and rack-
piston by turning wheel between 1/4 turn and 1
turn "off-center" on each side. Noticeable rough-
ness also requires worm replacement.
c. Checking Pitman Shaft End Play
(On-Center)
1. Find exact center of steering wheel travel.
Tight spot due to pitman shaft should extend for
1/4 turn to either side.
2. With wheel "on-center", measure and record
total pull through an arc of three inches or less.
3. This reading should not be more than 36
ounces, but should be at least 8 ounces (but never
more than 20) more than a reading taken 1/2 turn
off-center.
NOTE: On new steering gears, the factory
setting .with ball bearing preloads and new seal
drag may cause total pull to be as high as 40
ounces. Within the first 100 miles of operation,