operators_manual

WARNING
Frame welding is NOT recommended.
The high heat of welding nullifies the
special heat treatment of the rails,
greatly reducing the tensile strength of
the frame rail. If a frame member be-
comes cracked from overloading, fati-
gue, surface damage, or a collision,
the only permanent repair is to replace
the damaged frame member with a
new part.
Emergency Welding
In an emergency, a temporary repair may
be performed. Observe the following
precautions to protect electronic systems
during welding operations. Emergency
welding procedures are further explained in
the maintenance manuals. Please refer to
the ordering information on the back cover
to obtain a maintenance manual.
In the event of emergency welding of a
frame rail and when welding any other part
of your truck or any component attached to
your truck, observe the following
precautions before welding:
• Disconnect all electronic devices. It
is not possible to list all of the
electronics that could be affected,
but a few examples include the
following: alternator, engine
Electronic Control Unit (ECU),
transmission ECU, ABS ECU,
navigation devices, diagnostic
devices, and monitoring devices.
• Disconnect battery cables and
insulate them from the vehicle.
• Do not use the ECU or engine
ground stud for the ground of the
welding probe.
• Ensure that the ground connection
for the welder is as close to the
weld point as possible. This
ensures maximum weld current
and minimum risk to damage of
electrical components on the
vehicle.
Painting
Do not electrostatically paint your truck or
any component on your truck without first
removing all of the electronic components
from the truck. It is not possible to list all of
the electronics that could be affected, but a
few examples include the alternator,
engine Electronic Control Unit (ECU),
transmission ECU, ABS ECU, navigation
devices, diagnostic devices, and
monitoring devices.
Fifth Wheel Monthly Maintenance
• Refer to specific manufacturer's
literature for any special
instructions
• Steam clean the fifth wheel
• Check lock guard operation using a
commercial lock tester
• Clean and oil all moving parts
• Lubricate the lock mechanism with
a lithium-base grease
• All grease fittings (especially those
which grease the top surface of the
fifth wheel)
Fifth Wheel Bi-Annual Maintenance
NOTE
Whenever possible, torque all frame
fasteners on the nut end, not the bolt
head.
• Refer to specific manufacturer's
literature for any special
instructions.
MAINTENANCE - Frame
272 Y53-6126-1A1 (01/21)
5