PART 7: STARTING & OPERATING THE VEHICLE
Retarders
5. Assemble the release stud washer and nut on the re-
lease stud.
01899
6. With a wrench, turn the release stud assembly nut until
the compression spring is 90–95 percent caged. While
doing this, check to make sure the push rod (adapter
push rod or service push rod) is retracting.
01900
Do not over-torque the release stud assembly. (S-Cam
type maximum: 50 ft-lb, Wedge type maximum: 30 ft-lb.)
The spring brake is now mechanically released.
WARNING! Disassembling the spring brake
chamber is dangerous and could cause serious
injury.
These chambers contain a powerful
spring that is compressed. Sudden release of
this spring could cause you to be badly injured.
Do not disassemble a spring brake chamber.
Retarders
Various retarders are available which function against the
engine, driveline, or transmission. These are devices that
use your engine’s power to slow down your vehicle. They
save wear and tear on your service brakes and can be a
safety feature, too, because they can keep your brakes
from overheating.
Ideally, you should always slow your vehicle with your
retarder (where permitted by law) and use your service
brakes only for stopping completely. Operating this way
will greatly prolong the life of your brakes.
R(08/07)
Y53-6015
– 97 –
Summary of Contents for Peterbilt 320
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Page 210: ...PART 11 SUBJECT INDEX Windshield Washer Reservoir 29 206 Y53 6015 R 08 07 ...
Page 212: ...Peterbilt Motors Company P O Box 90208 Denton Texas 76202 ...