Section III –
Operating Instructions
COuPLINg PrOCeDure:
1. Prior to coupling, inspect the fifth wheel to
ensure a proper operation.
• Examine the mounting assembly for securely
fastened bolts, cracked welds or material
separation.
• Tilt the fifth wheel up and down to make sure
that it moves freely. Rest the fifth wheel in the
proper position by tilting it to the rear of the
tractor and resting it on the stops.
• Check the top surface of the fifth wheel for a
liberal coating of grease.
• If the tractor is equipped with an air sliding
fifth wheel, actuate the air cylinder and check
for air leaks.
WArNINg: Air cylinder should
not be disassembled as contents are under
pressure.
• The fifth wheel should be in an unlocked posi
-
tion (See Figure G). When unlocked, the handle
should be extended and the tips of the jaw
and lockbar (wedge) visible.
DO NOT TrY TO
COuPLe TO A CLOSeD FIFTH WHeeL.
2. The trailer kingpin should be inspected prior
to coupling. The kingpin plate should be fully
reinforced and of sufficient size to completely
cover the fifth wheel. If the kingpin plate is
too narrow, the uncovered portion of the fifth
Fontaine
®
Fifth Wheel Handbook
12
Figure G
