Table of Contents
Advertisement
1 9 - 3 6
STEERING
Fig. 37 Adjustment Reference Mark
(5) I n s t a l l the adjustment cap l o c k n u t and t i g h t e n
i t w i t h 115 N-m (85 ft-lbs) torque. Ensure t h a t the
adjustment cap does n o t rotate w h i l e t i g h t e n i n g the
locknut.
(6) Rotate the stub shaft clockwise to the stop, t h e n
rotate i t counterclockwise 1/4 of-a-turn.
(7) Use a low c a l i b r a t i o n (e.g., inch-pounds) torque
bar w i t h a m a x i m u m capacity o f 6 N-m/50 in-lbs
torque and a 12-point deep socket wrench to measure
the "preload" torque r e q u i r e d to rotate the stub shaft
(and wormshaft). Rotate the stub shaft a t a constant
speed (rpm) and measure t h e wormshaft "preload"
torque w i t h the beam of the torque bar at or near the
vertical position (Fig. 38).
(8) Record the wormshaft bearing "preload" torque
measurement. T h e "preload" torque required t o ro-
tate the stub shaft (and wormshaft) should be 0.45 to
1.13 N-m (4 to 10 in-lbs). I f the torque measurement
is not w i t h i n the specified torque range:
• the adjustment cap could be n o t tightened cor-
rectly or i t could have rotated w h i l e the l o c k n u t was
being tightened;
• the steering gear could be assembled incorrectly;
or
• the t h r u s t bearings and the races could be defec-
tive.
(9) I f necessary, correct the cause for the incorrect
"preload" torque and readjust the adjustment cap.
PITMAN SHAFT OVERCENTER DRAG
TORQUE-ADJUSTMENT
CAUTION: Do not attempt to adjust the pitman shaft
overcenter drag torque before the wormshaft bear-
ing "preload" torque has been adjusted.
•
Fig. 38 Wormshaft Bearing "Preload" Torque
Measurement
(1) Rotate the p i t m a n shaft adjustment screw coun-
terclockwise u n t i l i t is f u l l y extended, t h e n rotate i t
180 degrees clockwise.
(2) Rotate the stub shaft from stop-to-stop, count
the t o t a l n u m b e r of rotations, and rotate t h e stub
shaft i n the reverse direction 1/2 of t h e t o t a l n u m b e r
of rotations t o center the steering gear.
W h e n t h e s t e e r i n g g e a r i s c e n t e r e d , t h e flat
a r e a o n t h e s t u b s h a f t s h o u l d f a c e u p w a r d a n d
b e
p a r a l l e l w i t h t h e a d j u s t m e n t s c r e w
c o v e r
( F i g . 39) a n d t h e p i t m a n s h a f t m a s t e r
s p l i n e
s h o u l d b e a l i g n e d w i t h t h e a d j u s t m e n t s c r e w as
i l l u s t r a t e d i n F i g u r e 40.
(3)
Place
a low calibration (e.g.,
inch-pounds)
torque bar w i t h a m a x i m u m capacity of 6 N-m/50 i n -
lbs torque a n d a 12-point deep socket wrench on the
stub shaft. Place the torque bar i n a v e r t i c a l position
for t h e measurement. Rotate the torque bar 45 de-
grees each
side of vertical position )center) a n d
record the highest overcenter drag torque measured
at or near the steering gear center position (Fig. 41).
(4) T h e overcenter drag torque m u s t conform (as
applicable) t o the following specifications:
• for n e w steering gears (less t h a n 400 miles/640
k m ) — t h e overcenter drag torque should be equal t o
the previously measured wormshaft bearing "pre-
l o a d " torque plus an additional 0.45 to 0.90 N-m (4 t o
8 in-lbs) torque b u t must not exceed a m a x i m u m o f 2
N-m (18 in-lbs) torque; and
• for used steering gears (400 miles/640 k m or more-
)—the overcenter drag torque should be equal t o the
previously measured wormshaft bearing torque plus
Advertisement
Table of Contents
