Towing The Semitrailer - Landoll 334C Operator's Manual

3-6 TOWING THE SEMITRAILER

3-6.1 Driving the tractor with the semitrailer
coupled behind requires constant attention to
the overall length. Turning, passing, acceler-
ating, braking, stopping, and back-up require
special considerations.
steep grades or turning tight curves, the
semitrailer must not be allowed to push the
tractor, or jackknifing may result. Application
of the semitrailer brakes to keep the semi-
trailer in tow will help prevent this situation.
To assure control, brake before descending a
hill or attempting a curve.
CAUTION
WHEN OPERATING SEMITRAILER, DO
NOT BACK OVER CURB. THIS WILL
CAUSE SEVERE DAMAGE TO UNDER-
CARRIAGE AND UNDERCARRIAGE
CYLINDER.
3-6.2 Make a moving test of the semitrailer
brakes at low, and medium speeds before
traveling at highway speeds.
a. The Anti-Lock Brake System (ABS) warning
lamp mounted at left rear side of the semi-
trailer should come on when power is sup-
plied to the ABS by turning the tractor key
switch on. The warning lamp should go off
once the semitrailer exceeds 4 mph. If the
warning lamp does not go off, a fault exists in
the semitrailer ABS. Once the vehicle speed
exceeds 4 mph, the light should remain off
unless a fault occurs or the key switch is
turned off, then on again.
b. If the warning lamp does not go off, a fault
exists in the trailer ABS. If a fault exists, serv-
ice using the anti-lock brake system section
or the troubleshooting section of this manual.
When executing
CAUTION
IF A FAULT EXISTS IN THE SEMI-
TRAILER ABS, NORMAL BRAKING
WILL OCCUR, BUT WHEELS MAY
LOCK. SERVICE THE ABS AS SOON
AS POSSIBLE.
3-6.3 Monitor the air pressure gauge on the
dash of the towing vehicle. Pressure should
not fall below 90 psi at any time.
3-6.4 The semitrailer wheels track to the in-
side of the towing vehicle during turns. Thus,
turning corners requires a wide swing to pre-
vent "curb hopping", and to allow the semi-
trailer wheels to clear any obstacle on the in-
side of the corner.
3-6.5 To stop, use a gradual and smooth ap-
plication of brakes. If grabbing occurs, apply
less pressure - grabbing brakes are not effi-
cient.
WARNING
ALWAYS CHECK BEHIND AND UNDER
THE TRUCK AND SEMITRAILER FOR
PERSONS OR OBJECTS BEFORE
MOVING. FAILURE TO CHECK CAN
LEAD TO SERIOUS PERSONAL IN-
JURY OR DEATH TO OTHERS, OR
DAMAGE TO PROPERTY.
3-6.6 Backing should be done with care. Tail
overhang, semitrailer length, and allowable
space must be taken into consideration when
backing the semitrailer.
3-5