Download Group 19 STEERING GEAR

STEERING GEAR — 2 7
PISTON RING
PISTON
ADJUSTING NUT
CENTER THRUST BEARING RACE
WORM S H A F T
CYLINDER \ 'EAD
PISTON
•
•
i
WOSM
-TOOL
J
60x15
Fig. 41—Removing or Installing Piston Ring
t i g h t e n i n g u n i t t o 50 foot-pounds t o r q u e t o pres t r e t c h t h e w o r m shaft threads.
CAUTION
I f the worm shaft i s turned more than one-half turn,
the cylinder head sleeve will clear the oil seal ring on
the worm shaft. A l w a y s position the worm shaft oil
seal ring before bottoming the cylinder head against
the piston top flange to avoid damaging the oil seal
ring.
( 5 ) Loosen t h e a d j u s t i n g n u t . Place several
rounds of cord around t h e center b e a r i n g race ( F i g .
4 2 ) . , Make a loop in- one end o f t h e cord a n d hook
t h e loop o f a d i s t r i b u t o r breaker a r m s p r i n g scale
Tool M T U - 3 6 i n t h e cord loop. P u l l i n g t h e cord w i l l
cause t h e b e a r i n g race t o rotate. R e t i g h t e n t h e w o r m
bearing a d j u s t i n g n u t while p u l l i n g on t h e cord
w i t h t h e scale. I f t h e a d j u s t i n g n u t is t i g h t e n e d
WORM SHAFT
ADJUSTING
7
; EARING R A C E
SHAFT
59x141
Fig. 43—Staking Worm Shaft Bearing Adjusting Nut
properly, reading o n t h e scale should be 8 t o 16
ounces (12 ounces preferred) w h i l e t h e b e a r i n g race
is t u r n i n g .
CAUTION
Place a support under the adjusting nut during the
staking operation to avoid brinelling the piston and
worm bearings.
( 6 ) Stake t h e upper p a r t o f t h e w o r m shaft adj u s t i n g n u t i n t o t h e k n u r l e d area o f t h e shaft as
follows:
a. H o l d a % i n c h flat end punch on t h e center line
of t h e w o r m shaft a n d perpendicular t o t h e w o r m
shaft and a t a s l i g h t angle t o t h e n u t flange ( F i g .
43).
b. S t r i k e t h e punch a sharp blow w i t h a h a m m e r
and recheck t h e pre-load.
N O T E : I f the adjusting nut moved during the
staking operation, i t can be corrected by striking the
nut a glancing blow i n the direction required to regain proper pre-load.
NUT
CENTER BEARING RACrT
CORD
ADJUSTING SCREW
\
\
COVER
SCALE ITOOL)
FERRULE
58x65
Fig: 42—Checking Center Bearing Race Preload
58x66
Fig. 44—Steering G e a r Shaft Adjustment