Pre-Coupling Of Semitrailer And Tractor - Landoll 334C Operator's Manual

3-1.5 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 is con-
nected to the appropriate electrical source on the
tractor.

3-2 PRE-COUPLING OF SEMITRAILER AND TRACTOR

3-2.1 Slowly back the tractor up to the front
end of the semitrailer so the kingpin of the
semitrailer is centered between the tractor
fifth wheel jaws. Stop the tractor several
inches ahead of the semitrailer. Set tractor
parking brake.
CAUTION
DO NOT OPERATE TRAILER HYDRAU-
LICS UNLESS TRACTOR BRAKES ARE
LOCKED.
3-2.2 The king pin plate should be the same
height as, or slightly lower than, the latch
area of the fifth wheel plate of the tractor. If
necessary, connect the tractor hydraulic
lines. Use the TRAILER TILT CONTROL
(See Figure 3-2) to raise or lower the king-
pin plate sufficiently to allow proper coupling.
Drain all air and moisture from the tractor air
brake system in accordance with the tractor
manufacturer's instructions.
3-2
3-1.6
The manual controls are located on the driver's
side of the trailer. The controls can be operated by
a radio transmitter that is supplied standard. A hy-
draulic pump must be coupled to the trailer hydrau-
lic system before any hydraulic controls can func-
tion. The hydraulic system is designed to operate
at 2500 psi maximum pressure and approximately
17 gpm flow capacity.
3-2.3
3-2.4
a. Apply brakes and inspect brake action on all
b. Release brakes. All brakes should release
c. Disconnect the emergency air line from the
d. Re-connect the emergency air line to the
Figure 3-1 Service Hookups
Hydraulic
Connect the service and emergency air
hoses of the tractor to their respective glad-
hand on the front of the semitrailer. The trac-
tor's air hose couplings are then attached
and locked to the appropriate gladhands; the
red emergency line to the gladhand with
the "EMERGENCY" tag, and the blue serv-
ice line to the gladhand with the "SERV-
ICE" tag (See Figure 3-1). Chock the semi-
trailer wheels before activating the semitrailer
air supply valve in the tractor. Set the semi-
trailer brakes.
Check the air brake operations of the
semitrailer as follows:
wheels for prompt application.
immediately. Air pressure should discharge
quickly from the system.
semitrailer gladhand. Semitrailer brakes
should promptly set.
semitrailer and activate the semitrailer air
supply valve. The semitrailer brakes should
release when the air pressure in the emer-
gency line has built up to 90 psi and stabi-
lized.