OPERATING INSTRUCTIONS
3-3
Electrical
The only electrical operation required of the operator is
interconnection of the towing vehicle electrical cable plug
with the semitrailer electrical receptacle.
It is necessary that the tractor blue wire be connected to
the appropriate electrical source on the tractor.
Hydraulic
Most controls are located on the driver’s side of the
trailer. A hydraulic pump must be coupled to the trailer
hydraulic system, or the optional hydraulic engine
package started, before any hydraulic controls can
function. The hydraulic system is designed to operate at
2500 psi maximum pressure and approximately 17 gpm
flow capacity.
Figure 3-2: Service Hookups
Pre-Coupling of Semitrailer and
Tractor
1.
Slowly back the tractor/truck (towing vehicle) up to
the front end of the semitrailer so the kingpin of the
semitrailer is centered between the tractor fifth wheel
jaws. Stop the towing vehicle just inches ahead of the
semitrailer. Set tractor parking brake.
2.
Check the semitrailer king pin plate. It should be in a
horizontal position. The king pin plate should be the
same height, to slightly lower, than the latch area of
the fifth wheel plate of the towing vehicle. Crank two
speed landing gear up or down to correct height. If
you have the optional pin drop. Jack the trailer up to
take pressure off parking stand and re-pin into
correct height. Remove jack before connecting.Drain
all air and moisture from the towing vehicle air brake
system following towing vehicle manufacturer’s
instructions.
3.
Connect the service and emergency air hoses of the
towing vehicle to their respective gladhand on the
front of the semitrailer; red emergency line to the
gladhand with the
“EMERGENCY”
tag, and the blue
service line to the gladhand with the
“SERVICE”
tag
Chock the semitrailer wheels
before activating the semitrailer air supply valve in
the towing vehicle. Set the parking brakes.
WARNING
4.
Check the air brake operations of the semitrailer as
follows:
a.
Apply brakes and inspect brake action on all
wheels for prompt application.
b.
Release brakes. All brakes should release
immediately. Air pressure should discharge
quickly from the relay emergency valve.
c.
Disconnect the emergency air line from the
semitrailer gladhand. Trailer brakes should
promptly set.
d.
Re-connect the emergency air line to the
semitrailer and activate the semitrailer air supply
valve. The semitrailer brakes should set.
900c service hookups
HYDRAULIC PRESSURE (3/4” QUICK
COUPLERS 2500 PSI MAX 17 GPM)
HYDRAULIC RETURN
7-WAY ELECTRICAL
RECEPTACLE
SERVICE/CONTROL
GLADHAND
EMERGENCY/
SUPPLY
GLADHAND
Failure to chock semitrailer wheels could allow
movement of the semitrailer resulting in serious
personal injury, death, or damage to property in
its path.
