Chevrolet 70 Series 1970, Service Manual

Page: 212 / 841

FRONT SUSPENSION 3-29
against inner edge of bearing cup. A lternately
d rive on opposite sid e s of cup to avoid cocking
cup and damaging in sid e of hub.
2. To in sta ll new cups, position cup in hub
and drive into p la c e, u sin g a m ild s te e l rod against
outer edge of cup. A lternately drive against oppo­
s it e sid e s to a ssu r e driving cup in sq u arely. Cups
m ust sea t against shoulder in hub.
B rake Drum R eplacem ent
1. Rem ove b olts and lock nuts, o r studs and
nuts, attaching brake drum to hub.
2. R em ove brake drum and o il sh ield or de­
fle c to r (if used) from hub.
3. Apply P erm a tex betw een o il sh ield or de­
fle c to r (if used) and brake drum.
4. P o sitio n brake drum and o il sh ield or de­
fle c to r on hub, aligning a ll drain h oles.
5. In stall b olts and lock nuts or studs and nuts
attaching brake drum to hub. Tighten se c u r e ly .
W heel B olt R eplacem ent
IMPORTANT: If any w heel ex p erien ces a
sin g le stud fa ilu re, caused by a loose-ru n n in g
w h eel, a ll studs should be replaced. A lo o s e -
running w heel may ca u se only one stud to break,
but m ore studs could be fatigued to point of fa ilu re,
but not e a sily n oticeab le. R eplacing only one broken
stud and rem ounting the w heel could then prom ote
further and p o ssib ly se r io u s fa ilu re. If stud holes
have b ecom e elongated or distorted, rep la ce the
w heel.
W heel b o lts are se r r a te d and p r e s s e d into hub
flan ge. To rep lace b olts, p r e s s bolts out of hub
flan ge. P r e s s new b olts into p la ce, making sure
they a r e a tight fit. If a ll b olts are rem oved, be
su re o il sh ield or d eflector (when used) is in p lace
under bolt heads b efore in stallin g new b o lts.
R im Clamp Stud R eplacem ent
R im clam p studs can be rem oved and replaced
by using a conventional stud rem over and rep lacer
tool. When in sta llin g new studs, make su re studs
a r e firm ly bottom ed in tapped h oles and that
threads are not damaged during in stallation .
CHEVROLET SERIES 70-90 HEAVY DUTY TRUCK SHOP MANUAL