TRACTOR/SEMITRAILER COUPLING/UNCOUPLING (CONT)
The optimal condition when coupling the tractor/semitrailer is with both vehicles in
a straight line. Coupling can be accomplished with the tractor and semitrailer at an
offset angle (not grater (than 45). To prevent the tires from moving while
adjusting steering wedge, do not release brakes on semitrailer.
(7) Adjust steering wedge as follows:
(a) Manually adjust steering wedge (2) using steering valve (9) to aline with tractor fifth wheel vee entry (3).
When the steering wedge is significantly offset from the previous uncoupling
(more than 45), or because of improper operation of the semitrailer, movement of
the steering wedge way not respond to the operation of the steering valve. If this
condition exists, continue with steps (b) and (c) as required.
(b) If steering wedge (2) does not respond to operation of steering valve (9), attempt to induce movement
using crowbar and a spotter to push/pull against steering wedge while operating steering valve (9).
(c) If steering wedge (2) cannot be moved by use of crowbar and steering valve (9), it may be necessary to
apply a greater force by gently bumping wedge with tractor fifth wheel (4).
(8) While continuing to operate steering valve (9), direct tractor operator to very slowly back tractor toward
kingpin (1) until one side of fifth wheel vee entry contacts steering wedge (2) and pushes it toward center.
Once steering wedge has started to move, stop movement of tractor and apply tractor brakes.
(9) Using steering valve (9), manually aline steering wedge (2) with kingpin (1) for entry into tractor fifth wheel (4).