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
Controls are located on the driver’s side of the trailer. A
hydraulic pump must be coupled to the trailer hydraulic
system before any hydraulic controls can function. The
hydraulic system is designed to operate at 2500 psi
maximum pressure and approximately 20 gpm flow
capacity. The control valve has built-in flow control that
can handle 50 gpm max and it limits the functions to 20
gpm.
Tractor must be equipped with a relief valve set at a
maximum 2500 psi.
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. If
necessary, connect the tractor hydraulic lines, or start
the semitrailer hydraulic power engine. Use the
TRAILER LIFT
lever to raise or lower the kingpin
plate sufficiently to set proper coupling height
“Trailer Lift Lever” on page 3-7.)
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.
Figure 3-2: Service Hookups
Failure to chock semitrailer wheels could allow
movement of the semitrailer resulting in serious
personal injury, death, or damage to property in
its path.
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