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
engine 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
Huckbolt® fasteners do not require a torque check,
however, they should be inspected for damage.
Frame brackets and components secured with
conventional bolts and nuts are to be checked at
Initial Maintenance (IM). Check the torque of frame
fasteners to offset the effects of "bedding in" (or
seating). When checking torque, tighten the nut, not
the bolt head whenever possible. This will give a true
torque reading by eliminating bolt-body friction. When
checking the torque of frame fasteners, inspect the
frame for cracks and other damage. Set a click-type
torque wrench to the maximum torque of the fastener
you are checking. Apply pressure until the torque
wrench clicks. Do not loosen the bolt to check the
torque. See Group 00 in the Business Class® M2
Plus 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 other
damage must be repaired or replaced. Refer to the
Business Class M2 Plus Workshop Manual for repair
or replacement information.
31–02 Fifth Wheel Inspecting
WARNING
All fifth wheel maintenance, adjustment, and
rebuilding must be done only by a qualified
mechanic. 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.
Fontaine
1. Using a degreaser, clean the fifth wheel and
mounting brackets.
2. Inspect for cracks in the fifth wheel assembly, the
mounting brackets, and mounting components.
3. Inspect for wear and damage to moving parts.
4. Check for loose nuts and bolts in the fifth wheel
and mounting hardware. Tighten nuts and bolts
as necessary.
5. Check the wedge adjustment.
Frame and Frame Components 31
Business Class M2 Plus Maintenance Manual, 02/10/2023 31/1
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