Chevrolet 10 Series 1970 Service Manual page 516

STEERING 9-8
b. M easure distance fro m end o f pin to top o f b e a r ­
ing with m icro m eter.
c. R em ove bearin g and w ashers and place
bearing and w ashers on other end o f pin. M easure
distance from end o f pin to top o f bearing. If
m icro m eter readings in Steps b and c d iffe r m ore
than .012, repeat last p art o f Step 2 and recheck.
4. Apply a lib e ra l amount of wheel bearin g g re a se to
inside and outside of bearin g blocks and inside of
cover.
5. P ositio n tension spring and bearing blocks on pin.
6. Slide c o v e r o v e r bea rin g blocks aligning re fe re n c e
m ark on co v e r with m ark on shaft.
end of co ver and secu re with snap rin g retain er.
7. In stall lo w er shaft and coupling assem bly onto upper
shaft and lo w e r fle x ib le coupling.
in term ediate coupling
dim ensions shown in F ig u re 16.
NOTE: Be sure to maintain a fle x ib le coupling
to steerin g shaft flange dim ension o f .250" to
.375". The coupling pins should be centered in
the flange slots.
STEERING GEAR
Removal
1. Set wheels in straight ahead position.
shaft to w orm shaft relationship and loosen bolt at­
taching lo w er end of shaft coupling to steerin g gear.
2. Disconnect pitman arm fro m
T o o l J-6632 on light-duty m odels and T o o l J-21143
on medium and heavy-duty m odels.
3. Rem ove a ll steerin g gea r to fra m e mounting bolts
and rem ove g ea r fro m veh icle.
Installation
1. When rein stallin g steerin g gear assem bly a fter r e ­
placem ent of worm shaft, determ ine the c o r r e c t m id­
position of the w orm shaft as follow s:
a. Turn the shaft a ll the way through its tra ve l,
counting the number of turns.
b. Turn the shaft back one-half the total number of
turns. The g e a r
NOTE: On production C - K - P - 10-20-30 S eries
w orm shafts, this m ark w ill coincide with the
m ark already on the shaft.
2. P ositio n steerin g g e a r in place on fra m e , at the
sam e tim e sliding the w orm shaft into the fle x ib le o r
u n iversal joint coupling.
wheel is in the straight ahead position.
3. Attach and tighten mounting bolts and tighten bolt at
the coupling o r u n iversal joint.
NOTE: Be sure to maintain a fle x ib le coupling
to steerin g shaft flange dim ension of .250 to
.375". The coupling pins should be centered in
the flange slots.
4. Install pitm an arm and torque nut o r clam ping bolt
to sp ecification s.
NOTE: If a clamp type pitman arm is used,
spread the pitman
wedge, to slip the arm onto the pitman shaft.
Do not spread the pitm an arm m ore than r e ­
quired to slip o v e r
p ressu re. Do not ham m er the pitm an arm onto
same
In stall seal into
Install fle x ib le and
b olts while maintaining the
M ark steerin g
steerin g gear.
should now be on high point.
Check that the steerin g
arm just enough, with a
pitman shaft with hand
F ig . 14— In s ta llin g Pitman S haft Seal
the pitman shaft o r damage to the gear may
result.
NOTE: The fle x ib le coupling to steerin g gea r,
gear to fram e and pitman arm to pitman shaft
fa sten ers are im portant attaching parts in that
U se
they could a ffect the perform an ce o f vita l co m ­
ponents and system s, and/or could resu lt in m a­
jo r re p a ir expense.
one of the sam e p art number o r with an equiva­
lent part if replacem en t becom es n ecessary. Do
not use a replacem en t part o f le s s e r quality o r
substitute design.
as sp ecified during reassem b ly to assure proper
retention of this part.
P ITM A N SHAFT SEAL REPLACEMENT
A faulty seal m ay be replaced without rem ovin g the
g e a r fro m the truck.
1. M ark the relationship of the pitm an arm and pitman
shaft and then disconnect the pitm an arm fro m the
g e a r using T o o l J-6632 on light duty trucks and
J-21143 on heavy duty trucks.
2. Loosen the lash adjuster locknut and turn the lash
adjuster a few turns cou n ter-clockw ise.
3. R em ove the three side c o v e r screw s and lift the
side co v e r and pitman shaft out o f the g e a r housing
as a unit.
4. P r y out the pitman shaft seal being carefu l not to
damage the housing bore.
5. Coat the new seal with g ea r lubricant and in stall in
the housing using a suitable s iz e socket (fig . 14).
6. Pack as much new Steering G ear Lubricant (m eeting
GM S pecification
housing as it w ill hold without fallin g out the pitman
shaft opening.
7. P la c e a p iece of tape o v e r the splined end of the p it­
man shaft and then lo w e r the pitman shaft and side
c o v e r into the housing.
NOTE: B e fo re the pitm an shaft is a ll the way
into the housing, m ore lubricant can be added in
the center cavity.
Th ey must be rep la ced with
Torqu e values must be used
GM4673M) into the ends o f the
CHEVROLET TRUCK SERVICE MANUAL