With semitrailer uncoupled and gladhand dummy couplings installed, parking
brakes cannot be applied with brake release valve. The dummy coupling must be
removed from the emergency (red) glandhand prior to applying parking brakes or
injury to personnel may result.
(1) If coupled, apply semitrailer parking brakes using semitrailer brake release valve (5). If semitrailer is
uncoupled, remove dummy coupling from emergency (red) gladhand. Apply brakes on semitrailer by pulling
knob on brake release valve (5) outward. If no other braking applications are required, install dummy
coupling onto emergency gladhand.
(2) Move wheel chocks (6) back into place under tires to chock wheels.
(3) Push in handles of suspension shut-off valve (4) to SHUT-OFF position.
(4) Close access cover (3), rotate hasp (2) to secure cover, and install pin (1) in hasp (2).
OPERATING FRONT SUPPORT LEGS
Before performing any maintenance on the platform, lower the front and rear
support legs or serious injury to personnel may result.
When lowering the support legs, make sure that feet and hands are clear of the
support leg foot as it nears the ground or serious injury to personnel may result.
When lowering or raising the support legs, always install the retaining pins or
serious injury to personnel may result.
The following procedures apply to either front support leg. Both support legs are
identical except that the retaining pin for the curbside leg is installed from the
When preparing to lower the front support legs, ensure the ground surface texture
is strong/hard enough to support the front support legs without sinking into the
ground. If extra support is required, place large pieces of lumber and/or steel plate
under the support legs.
a. Ensure semitrailer is on level ground, wheels are chocked, and trailer parking brakes are applied. If semitrailer is
coupled to a tractor, apply semitrailer parking brake.