freightliner 108SD 2021, Driver Manual

Page: 68 / 191

31–00 Safety Precautions
Safety Precautions in this section apply to all
procedures within this group.
DANGER
When working on the vehicle, shut down the en-
gine or motor, set the parking brake, and chock
the tires. Before working under the vehicle, always
place jack stands under the frame rails to ensure
the vehicle cannot drop. Failure to follow these
steps could result in serious personal injury or
death.
31–01 Frame Fastener Torque
Check
Frame brackets and components secured with Huck-
bolt® fasteners do not require a torque check, how-
ever, they should be inspected for damage. Frame
brackets and components secured with conventional
bolts and nuts are to be checked at initial mainte-
nance (IM).
Check the torque of frame fasteners to offset the ef-
fects of bedding in or seating. When possible, always
check the torque of the nut, not the bolt head. This
will give a true torque reading by eliminating bolt-
body friction.
When checking the torque of frame fasteners, in-
spect the frame for cracks and other damage.
Set a click-type torque wrench to the maximum
torque of the fastener you are checking. Apply pres-
sure until the torque wrench clicks. Do not loosen the
bolt to check the torque. See
Group 00 in the ve-
hicle workshop manual for torque specifications.
NOTICE
Make sure frame fasteners are properly tightened.
Continued vehicle operation with loose fasteners
could result in bracket or frame damage.
Check the fasteners at the following locations:
•
axle stops
•
deck plates
•
equalizer brackets
•
exhaust brackets
•
fifth wheel legs
•
fifth wheel mountings
•
frame crossmembers and gussets
•
front frame brackets
•
front suspension spring brackets
•
fuel tank brackets
•
radius rods
•
rear suspension spring brackets
•
shock absorbers
•
all other suspension fasteners
•
all other axle fasteners
•
all other frame fasteners
Any component that shows signs of cracking or dam-
age must be repaired or replaced. See the applicable
group in the
108SD and 114SD Workshop Manual
for repair or replacement information.
31–02 Fifth Wheel Inspection
WARNING
All fifth wheel maintenance, adjustment, and re-
building must be done only by a qualified me-
chanic. Improper or incomplete procedures could
result in a possible disengagement of the trailer
from the tractor, which could result in personal
injury or property damage.
Parts are under spring compression. Wear safety
goggles while servicing the fifth wheel. Failure to
do so can result in personal injury, due to parts
ejecting with force.
Holland FWS1
1. Disconnect the tractor from the trailer. For in-
structions, see the
108SD and 114SD Driver’s
Manual .
2. Thoroughly steam clean the fifth wheel.
3. Check the fifth wheel plate for cracks. Check for
sharp edges on top; the chamfer should be 1/8
to 1/4 inch (3 to 6 mm).
Frame and Frame Components
31
108SD and 114SD Maintenance Manual, May 2018
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