Mechanical Steering Gear Replacement - Chevrolet 70 Series 1970 Service Manual

STEERING SYSTEM 9-22

MECHANICAL STEERING GEAR REPLACEMENT

NOTE: A ll steerin g gear, and pitman arm attaching bolts and nuts a re im port­
ant attaching parts in that they could affect the perform ance of vital com ponents
and sy ste m s, and/or could resu lt in major repair expense. They m ust be replaced
with parts of the sam e part numbers or with equivalent p arts if replacem ent b e­
com es n e c e ssa r y . Do not u se replacem ent p arts of le s s e r quality or substitute
design . Torque values m ust be used a s sp ecified during rea ssem b ly to a ssu r e
proper retention of these p a rts.
If the steerin g gear cannot be properly adjust­
ed, or if during adjustm ent procedures "lumpy" or
"rough" action is noticed, the steerin g gear m ust
be rem oved from the veh icle and overhauled. The
steerin g gear m ust be rem oved from the veh icle
for a ll overhaul procedu res.
STEERING GEAR REM OVAL
1. D isconnect steerin g linkage from Pitman
arm .
2. Scribe an alignm ent mark on steerin g gear
w orm shaft and clam p yoke or coupling on steerin g
gear low er or interm ediate shaft.
3. R em ove bolt attaching low er or interm ed­
iate shaft clamp yoke or coupling to steerin g gear
worm shaft.
4. On conventional cab m odels which have P it­
man arm retained with a clamp bolt, nut, and
sp e cia l hardened w asher, scr ib e an alignm ent
m ark a c r o ss Pitm an arm and shaft (fig. 26). R e­
m ove Pitm an arm .
On a ll other v e h ic le s, rem ove Pitm an arm nut
and lock washer; then using p uller (J-3186), r e ­
m ove Pitm an arm .
5. Rem ove bolts, nuts,
which attach steerin g gear to fram e and rem ove
steerin g gear.
STEERING GEAR INSTALLATION
1. P o sitio n steerin g w heel in straight-ahead
position and steerin g gear in cen ter position. Mark
on worm shaft should be in
2. P osition steerin g gear on fram e sid e m em ­
b er, and at the sam e tim e slid e the worm shaft
into the clamp yoke or cospling on steerin g low er
or interm ediate shaft.
IMPORTANT: Check to make su re match
m arks on low er or interm ediate shaft clamp yoke
or coupling and steerin g gear worm shaft are
aligned.
3. In stall b olts, nuts, and w ashers which at­
tach steerin g gear to fram e. Tighten bolts to torque
liste d in "Specifications" at end of th is section .
yoke or coupling to steerin g gear worm shaft with
bolt; or bolt, nut, and w asher. Tighten bolt or nut
to torque liste d in "Specifications" at end of this
section .
P itm an arm retained with a clam p bolt, nut, and
w ash er, in sta ll Pitm an arm on shaft with match
m arks aligned. Install bolt, nut, and w asher and
tighten to torque sp ecified in "Specifications" at
end of this section .
shaft have m atching blank serra tio n s which must
be aligned. With Pitm an arm and shaft aligned,
p r e ss Pitm an arm onto shaft and in sta ll w asher
and Pitm an shaft nut. Tighten nut to torque sp e c i­
fied in "Specifications" at end of this section .
bled, be carefu l to align the locating arrow s on
e ssa r y to ensure proper u n iversal joint phasing.
DISASSEMBLY
and lock w ash ers,
groove and pull the two halves apart.
sp lit s e a l, and dust cap from shaft.
ASSEMBLY
mating fem ale shaft.
o'clock position.
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spreading the sp lit ends over the shaft.
noting that the sp lit nylon w asher w ill contact both
the dust cap and the se a l.
spline su rfa ces and lubricate with c h a ssis g rea se
b efore a ssem b ly.
that the alignm ent arrow s a re m atched (se e fig. 27).
groove.
4. Attach low er or interm ediate shaft clamp
5. On conventional cab m odels which have
On a ll other veh icles Pitm an arm and Pitm an
STEERING COLUMN SLIP SPLINE
NOTE: W henever the slip spline is d isa sse m ­
each half when reassem b lin g (fig. 27). T his is nec­
1. P ry the dust cap tabs out of the retaining
2. R em ove the sp lit nylon retaining w asher,
1. P osition the dust cap on the m ale splined
shaft so that retaining tabs face the groove of the
2. Install the sp lit nylon w asher by carefully
3. Carefully spread the fe lt se a l over the shaft,
4. Thoroughly clean both m ale and fem ale
5. Slide the two shafts together taking note
. Bend the dust cap retaining tabs into the
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CHEVROLET SERIES 70-90 HEAVY DUTY TRUCK SHOP MANUAL