Emergency repairs
– 94 –
4. Slide out the
release stud.
5. Insert the
release stud
through the
opening in the
spring chamber
where the cap
was removed.
Insert it into the pressure plate. Turn the
release stud 1/4 turn clockwise in the
pressure plate. This secures the cross
pin into the cross pin area of the pres-
sure plate and locks it into the manual
release position.
6. Assemble the
release stud
washer and nut
on the release
stud.
7. With a
wrench, turn the
release stud
assembly nut
until the com-
pression spring
is 90–95 per-
cent caged. While doing this, check to
make sure the push rod (adapter push
rod or service push rod) is retracting.
Do not over-torque the release stud
assembly. (S–Cam type maximum: 50
ft-lb.) The spring brake is now mechani-
cally released.
Jacking The Vehicle
WARNING! If you are not
fully qualified and not
equipped with the proper
tools and equipment, do not attempt
to raise the vehicle or remove or
install a damaged tire and wheel
assembly. Obtain expert help. A per-
son can be seriously injured and/or
damage can result from using the
wrong service methods. Truck tires
and wheels should be serviced only
by trained personnel using proper
equipment.
Before attempting to jack the vehicle,
ensure the following:
• The complete vehicle is on stable
level ground.
• The parking brake is applied and
chocks have been positioned under
the road wheels.
PB1340A.book Page 94 Friday, September 1, 2000 7:40 AM